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ICL3237
Data Sheet October 21, 2005 FN6003.3
1 Microamp Supply-Current, +3V to +5.5V, 1Mbps, RS-232 Transmitters/Receivers
The Intersil ICL3237 contains 3.0V to 5.5V powered RS-232 transmitters/receivers which meet ElA/TIA-232 and V.28/V.24 specifications, even at VCC = 3.0V. Targeted applications are cell phones, PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby, power consumption is critical. Efficient onchip charge pumps, coupled with manual powerdown function, reduce the standby supply current to a 1A trickle. Small footprint packaging, and the use of small, low value capacitors ensure board space savings as well. Data rates greater than 1Mbps (MBAUD = VCC) are guaranteed at worst case load conditions. This family is fully compatible with 3.3V only systems, mixed 3.3V and 5.0V systems, and 5.0V only systems. The ICL3237 is a 5 driver, 3 receiver device that also includes a noninverting always-active receiver for "wake-up" capability. Table 1 summarizes the features of the device represented by this data sheet, while Application Note AN9863 summarizes the features of each device comprising the ICL32XX 3V family.
Features
* 15kV ESD Protected (Human Body Model) * Drop in Replacement for MAX3237 * Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V * Latch-Up Free * On-Chip Voltage Converters Require Only Four External Capacitors * Manual Powerdown Features * Flow Through Pinout * Receiver Hysteresis For Improved Noise Immunity * Pin Selectable Data Rate * Guaranteed Minimum Data Rate . . . . . . . 250kbps/1Mbps * Guaranteed Minimum Slew Rate . . . . . . . 6V/s or 24V/s * Wide Power Supply Range . . . . . . . Single +3V to +5.5V * Low Supply Current in Powerdown State. . . . . . . . . . .1A * Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
* Any System Requiring RS-232 Communication Ports - Battery Powered, Hand-Held, and Portable Equipment - Laptop Computers, Notebooks, Palmtops - Modems, Printers and other Peripherals - Digital Cameras - Cellular/Mobile Phone
Related Literature
* Technical Brief TB363 "Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)" * AN9863 "3V to +5.5V, 250k-1Mbps, RS-232 Transmitters/Receivers"
TABLE 1. SUMMARY OF FEATURES NO. OF MONITOR Rx. (ROUTB) 1 (NOTE 1) DATA RATE (kbps) 250/1000 MANUAL POWERDOWN? YES AUTOMATIC POWERDOWN FUNCTION? NO
PART NUMBER ICL3237 NOTE:
NO. OF NO. OF Tx. Rx. 5 3
Rx. ENABLE FUNCTION? YES
READY OUTPUT? NO
1. Data rate is selectable via the MBAUD pin.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2001-2002, 2004-2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ICL3237 Pinout
ICL3237 (SSOP) TOP VIEW
C2+ 1 GND 2 C23 28 C1+ 27 V+ 26 VCC 25 C124 T1IN 23 T2IN 22 T3IN 21 R1OUT 20 R2OUT 19 T4IN 18 R3OUT 17 T5IN 16 R1OUTB 15 MBAUD
Ordering Information
PART NO. ICL3237CA ICL3237CAZ (See Note) ICL3237IA ICL3237IAZ (See Note) PART MARKING ICL3237CA ICL3237CAZ ICL3237IA ICL3237IAZ TEMP. RANGE (C) 0 to 70 0 to 70 PACKAGE 28 Ld SSOP 28 Ld SSOP (Pb-free) PKG. DWG. # M28.209 M28.209 M28.209 M28.209
V- 4 T1OUT 5 T2OUT 6 T3OUT 7 R1IN 8 R2IN 9 T4OUT 10 R3IN 11 T5OUT 12 EN 13 SHDN 14
-40 to 85 28 Ld SSOP -40 to 85 28 Ld SSOP (Pb-free)
*Add "-T" suffix to part number for tape and reel packaging. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
Pin Descriptions
PIN VCC V+ VGND C1+ C1C2+ C2TIN TOUT RIN ROUT ROUTB EN SHDN MBAUD System Power Supply Input (3.0V to 5.5V). Internally Generated Positive Transmitter Supply (+5.5V). Internally Generated Negative Transmitter Supply (-5.5V). Ground Connection. External Capacitor (Voltage Doubler) is connected to this lead. External Capacitor (Voltage Doubler) is connected to this lead. External Capacitor (Voltage Inverter) is connected to this lead. External Capacitor (Voltage Inverter) is connected to this lead. TTL/CMOS Compatible Transmitter Inputs. RS-232 level (nominally 5.5V) transmitter outputs. RS-232 Compatible Receiver Inputs. TTL/CMOS Level Receiver Outputs. TTL/CMOS Level, Noninverting, Always Enabled Receiver Output. Active Low Receiver Enable Control; doesn't disable ROUTB output. Active Low Input to Shutdown Transmitters and On-Board Power Supply, to place device in low power mode. Input Low selects 250kbps data rate, and input high selects 1Mbps data rate. FUNCTION
2
ICL3237 Typical Operating Circuit
ICL3237
C3 (OPTIONAL CONNECTION, NOTE) +3.3V 0.1F 28 + 25 1 + 3 24 T1IN 23 T2IN 22 T3IN 19 T4IN 17 T5IN TTL/CMOS LOGIC LEVELS R1OUTB 21 R1OUT R1 20 R2OUT R2 18 R3OUT R3 13 EN 5k 5k 11 R3IN 5k 9 R2IN RS-232 LEVELS 8 R1IN 16 T5 12 T5OUT T4 10 T4OUT T3 7 T3OUT T2 6 T2OUT RS-232 LEVELS C1+ C1C2+ C2T1 V26 VCC 27 V+ 4 + C3 0.1F + C4 0.1F + T1OUT 5 GND 2 +
C1 0.1F C2 0.1F
VCC TO CONTROL LOGIC
14 SHDN 15 MBAUD
NOTE: THE NEGATIVE TERMINAL OF C3 CAN BE CONNECTED TO EITHER VCC OR GND.
3
ICL3237
Absolute Maximum Ratings
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V V+ to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V V- to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3V to -7V V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V Input Voltages TIN, EN, SHDN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V MBAUD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC+0.3V RIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25V Output Voltages TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2V ROUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC +0.3V Short Circuit Duration TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Thermal Information
Thermal Resistance (Typical, Note 2) JA (oC/W) 28 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . . 100 Moisture Sensitivity (see Technical Brief TB363) All Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 1 Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (Lead Tips Only)
Operating Conditions
Temperature Range ICL3237C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC ICL3237I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE: 2. JA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
Test Conditions: VCC = 3V, C1 - C4 = 0.22F; VCC = 3.15V to 5.5V, C1 - C4 = 0.1F, Unless Otherwise Specified. Typicals are at TA = 25oC TEST CONDITIONS TEMP (oC) MIN TYP MAX UNITS
PARAMETER DC CHARACTERISTICS Supply Current, Powerdown Disabled Supply Current, Powerdown
All Outputs Unloaded, VCC = 3.15V, SHDN = VCC SHDN = GND
25
-
0.3
1.0
mA A
25
-
1.0
10
LOGIC AND TRANSMITTER INPUTS AND RECEIVER OUTPUTS Input Logic Threshold Low Input Logic Threshold High TIN, EN, SHDN, MBAUD TIN, EN, SHDN, MBAUD VCC = 3.3V VCC = 5.0V Transmitter Input Hysteresis Input Leakage Current Output Leakage Current Output Voltage Low Output Voltage High RECEIVER INPUTS Input Voltage Range Input Threshold Low VCC = 3.3V VCC = 5.0V Input Threshold High Input Hysteresis Input Resistance TRANSMITTER OUTPUTS Output Voltage Swing All Transmitter Outputs Loaded with 3k to Ground Full 5.0 5.4 V VCC = 3.3V to 5.0V Full 25 25 25 25 25 -25 0.6 0.8 3 1.2 1.5 1.6 0.3 5 25 2.4 7 V V V V V k TIN, EN, SHDN, MBAUD EN = VCC (Receivers Disabled) IOUT = 1.6mA IOUT = -1.0mA Full Full Full 25 Full Full Full Full 2.0 2.4 0.5 0.01 0.05 0.8 1.0 10 0.4 V V V V A A V V
VCC -0.6 VCC -0.1
4
ICL3237
Electrical Specifications
Test Conditions: VCC = 3V, C1 - C4 = 0.22F; VCC = 3.15V to 5.5V, C1 - C4 = 0.1F, Unless Otherwise Specified. Typicals are at TA = 25oC (Continued) TEST CONDITIONS VCC = V+ = V- = 0V, Transmitter Output = 2V TEMP (oC) Full Full VOUT = 12V, VCC = 0V or 3V to 5.5V, SHDN = GND Full MIN 300 TYP 10M 35 MAX 60 25 UNITS mA A
PARAMETER Output Resistance Output Short-Circuit Current Output Leakage Current TIMING CHARACTERISTICS Maximum Data Rate
RL = 3k, One Transmitter Switching
CL = 1000pF VCC = 3V to 4.5V, CL = 250pF VCC = 4.5V to 5.5V, CL = 1000pF
MBAUD = GND MBAUD = VCC MBAUD = VCC
Full Full
250 1000
700 1700
-
kbps kbps
Full
1000
1100
-
kbps s s ns ns ns ns
Receiver Propagation Delay
Receiver Input to Receiver Output, CL = 150pF Normal Operation Normal Operation tPHL - tPLH (Note 3)
tPHL tPLH
25 25 25 25
6 24 4
0.15 0.15 200 200 100 25 50 17 40 12
-
Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew
MBAUD = GND MBAUD = VCC, VCC = 3.0V
25 25 25 25 25 25
Receiver Skew Transition Region Slew Rate
tPHL - tPLH, CL = 150pF CL = 150pF to 1000pF MBAUD = GND VCC = 3.3V, RL = 3k to 7k, MBAUD = VCC Measured From 3V to -3V or -3V to 3V CL = 150pF to 2500pF MBAUD = GND
30 150 30
ns V/s V/s V/s
ESD PERFORMANCE RS-232 Pins (TOUT, RIN) Human Body Model IEC61000-4-2 Contact Discharge IEC61000-4-2 Air Gap Discharge All Other Pins NOTE: 3. Skew is measured at the input switching points (1.4V). Human Body Model 25 25 25 25 15 8 >8 2.5 kV kV kV kV
5
ICL3237 Detailed Description
The ICL3237 operates from a single +3V to +5.5V supply, guarantees a 1Mbps minimum data rate, requires only four small external 0.1F capacitors, features low power consumption, and meets all EIA/TIA-232 and V.28 specifications. The circuit is divided into three sections: The charge pump, the transmitters, and the receivers. regardless of the state of any control lines. All the receivers convert RS-232 signals to CMOS output levels and accept inputs up to 25V while presenting the required 3k to 7k input impedance (see Figure 1) even if the power is off (VCC = 0V). The receivers' Schmitt trigger input stage uses hysteresis to increase noise immunity and decrease errors due to slow input signal transitions. Monitor receivers remain active even during manual powerdown and forced receiver disable, making them extremely useful for Ring Indicator monitoring. Standard receivers driving powered down peripherals must be disabled to prevent current flow through the peripheral's protection diodes (see Figures 2 and 3). This renders them useless for wake up functions, but the corresponding monitor receiver can be dedicated to this task as shown in Figure 3.
VCC RXIN -25V VRIN +25V GND 5k RXOUT GND VROUT VCC
Charge-Pump
Intersil's new ICL32XX family utilizes regulated on-chip dual charge pumps as voltage doublers, and voltage inverters to generate 5.5V transmitter supplies from a VCC supply as low as 3.0V. This allows these devices to maintain RS-232 compliant output levels over the 10% tolerance range of 3.3V powered systems. The efficient on-chip power supplies require only four small, external 0.1F capacitors for the voltage doubler and inverter functions at VCC = 3.3V. See the "Capacitor Selection" section, and Table 3 for capacitor recommendations for other operating conditions. The charge pumps operate discontinuously (i.e., they turn off as soon as the V+ and V- supplies are pumped up to the nominal values), resulting in significant power savings.
FIGURE 1. INVERTING RECEIVER CONNECTIONS
Transmitters
The transmitters are proprietary, low dropout, inverting drivers that translate TTL/CMOS inputs to EIA/TIA-232 output levels. Coupled with the on-chip 5.5V supplies, these transmitters deliver true RS-232 levels over a wide range of single supply system voltages. All transmitter outputs disable and assume a high impedance state when the device enters the powerdown mode (see Table 2). These outputs may be driven to 12V when disabled. The ICL3237 guarantees a 1Mbps data rate (if MBAUD = 1) for full load conditions (3k and 250pF), VCC 3.0V, with one transmitter operating at full speed. Under more typical conditions of VCC 3.3V, C1-4 = 0.1F, RL = 3k, and CL = 250pF, one transmitter easily operates at 1.7Mbps. Transmitter inputs float if left unconnected, and may cause ICC increases. Connect unused inputs to GND for the best performance.
Powerdown Functionality
This 3V device requires a nominal supply current of 0.3mA during normal operation (not in powerdown mode). This is considerably less than the 5mA to 11mA current required of 5V RS-232 devices. The already low current requirement drops significantly when the device enters powerdown mode. In powerdown, supply current drops to 1A, because the on-chip charge pump turns off (V+ collapses to VCC, Vcollapses to GND), and the transmitter outputs three-state. This micro-power mode makes the ICL3237 ideal for battery powered and portable applications.
Software Controlled (Manual) Powerdown
On the ICL3237, the powerdown control is via a simple shutdown (SHDN) pin. Driving this pin high enables normal operation, while driving it low forces the IC into it's powerdown state. Connect SHDN to VCC if the powerdown function isn't needed. Note that all the receiver outputs remain enabled during shutdown (see Table 2). For the lowest power consumption during powerdown, the receivers should also be disabled by driving the EN input high (see next section, and Figures 2 and 3). The time required to exit powerdown, and resume transmission is only 100s.
Receivers
The ICL3237 device contains standard inverting receivers that three-state only when the EN control line is driven high. Additionally, it includes a noninverting (monitor) receiver (denoted by the ROUTB label) that is always active,
TABLE 2. POWERDOWN AND ENABLE LOGIC TRUTH TABLE SHDN INPUT L L H H EN INPUT L H L H TRANSMITTER OUTPUTS High-Z High-Z Active Active RECEIVER OUTPUTS Active High-Z Active High-Z ROUTB OUTPUT Active Active Active Active MODE OF OPERATION Manual Powerdown Manual Powerdown w/Rcvr. Disabled Normal Operation Normal Operation w/Rcvr. Disabled
6
ICL3237
Receiver ENABLE Control
This device also features an EN input to control the receiver outputs. Driving EN high disables all the inverting (standard) receiver outputs placing them in a high impedance state. This is useful to eliminate supply current, due to a receiver output forward biasing the protection diode, when driving the input of a powered down (VCC = GND) peripheral (see Figure 2). The enable input has no effect on transmitter nor monitor (ROUTB) outputs.
VCC VCC CURRENT FLOW VOUT = VCC Rx POWERED DOWN UART Tx GND SHDN = GND OLD RS-232 CHIP
For higher speed serial communications, the ICL3237 features MegaBaud operation. In MegaBaud operating mode (MBAUD = VCC), the ICL3237 transmitters guarantee a 1Mbps data rate with worst-case loads of 3k in parallel with 250pF for 3.0V < VCC < 4.5V. For 5V 10% operation, the ICL3237 transmitters guarantee a 1Mbps data rate into worst-case loads of 3k in parallel with 1000pF.
Capacitor Selection
The charge pumps require 0.1F capacitors for 3.3V operation. For other supply voltages refer to Table 3 for capacitor values. Do not use values smaller than those listed in Table 3. Increasing the capacitor values (by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without increasing C1's value, however, do not increase C1 without also increasing C2, C3, and C4 to maintain the proper ratios (C1 to the other capacitors). When using minimum required capacitor values, make sure that capacitor values do not degrade excessively with temperature. If in doubt, use capacitors with a larger nominal value. The capacitor's equivalent series resistance (ESR) usually rises at low temperatures and it influences the amount of ripple on V+ and V-.
TABLE 3. REQUIRED CAPACITOR VALUES VCC (V) 3.0 to 3.6 C1 (F) 0.22 0.1 0.047 0.22 C2, C3, C4 (F) 0.22 0.1 0.33 1.0
VCC
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN PERIPHERAL
VCC
3.15 to 3.6 4.5 to 5.5
ICL3237
TRANSITION DETECTOR TO WAKE-UP LOGIC VCC R1OUTB RX POWERED DOWN UART VOUT = HI-Z R1OUT TX T1IN T1OUT SHDN = GND, EN = VCC R1IN
3.0 to 5.5
Power Supply Decoupling
In most circumstances a 0.1F bypass capacitor is adequate. In applications that are particularly sensitive to power supply noise, decouple VCC to ground with a capacitor of the same value as the charge-pump capacitor C1. Connect the bypass capacitor as close as possible to the IC.
Transmitter Outputs when Exiting Powerdown
Figure 4 shows the response of two transmitter outputs when exiting powerdown mode. As they activate, the two transmitter outputs properly go to opposite RS-232 levels, with no glitching, ringing, nor undesirable transients. Each transmitter is loaded with 3k in parallel with 2500pF. Note that the transmitters enable only when the magnitude of the supplies exceed approximately 3V.
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
MegaBaud Selection
In normal operating mode (MBAUD = GND), the ICL3237 transmitters guarantee a 250kbps data rate with worst-case loads of 3k in parallel with 1000pF. This provides compatibility with PC-to-PC communication software, such as LaplinkTM.
High Data Rates
The ICL3237 maintains the RS-232 5V minimum transmitter output voltages even at high data rates. Figure 5
7
Laplink(R) is a registered trademark of Traveling Software.
ICL3237
details a transmitter loopback test circuit, and Figure 6 illustrates the standard speed loopback test result for a single transmitter driving 1000pF and an RS-232 load at 250kbps. Figure 7 shows the megabaud loopback results for a single transmitter driving 250pF and an RS-232 load at 1Mbps. The static transmitters were also loaded with an RS-232 receiver.
5V/DIV. MBAUD = GND T1IN
T1OUT 5V/DIV. SHDN T1 R1OUT VCC = +3.3V C1 - C4 = 0.1F 2s/DIV.
2V/DIV.
FIGURE 6. LOOPBACK TEST AT 250kbps (CL = 1000pF)
T2 VCC = +3.3V C1 - C4 = 0.1F TIME (20s/DIV.) 5V/DIV. MBAUD = VCC T1IN
FIGURE 4. TRANSMITTER OUTPUTS WHEN EXITING POWERDOWN
T1OUT VCC 0.1F
+ R1OUT
+ C1
C1+ C1-
VCC
V+
+ C3
VCC = +3.3V C1 - C4 = 0.1F 0.5s/DIV.
ICL3237 + C2 C2TIN ROUT EN VCC SHDN MBAUD TOUT RIN 5K CL C2+ VC4 +
FIGURE 7. LOOPBACK TEST AT 1Mbps (CL = 250pF)
Interconnection with 3V and 5V Logic
The ICL3237 directly interfaces with most 5V logic families, including ACT and HCT CMOS. See Table 4 for more information on possible combinations of interconnections.
TABLE 4. LOGIC FAMILY COMPATIBILITY WITH VARIOUS SUPPLY VOLTAGES SYSTEM POWER-SUPPLY VOLTAGE (V) 3.3 5 5 VCC SUPPLY VOLTAGE (V) 3.3 5 3.3
GND or VCC
FIGURE 5. TRANSMITTER LOOPBACK TEST CIRCUIT
COMPATIBILITY Compatible with all CMOS families. Compatible with all TTL and CMOS logic families. Compatible with ACT and HCT CMOS, and with TTL. Incompatible with AC, HC, or CD4000 CMOS.
8
ICL3237 Typical Performance Curves
6 TRANSMITTER OUTPUT VOLTAGE (V) TRANSMITTER OUTPUT VOLTAGE (V) VOUT+ 4 2 1 TRANSMITTER AT 250kbps OTHER TRANSMITTERS AT 30kbps 0 MBAUD = GND -2 -4 -6 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF) VOUT -
VCC = 3.3V, TA = 25oC
6 VOUT+ 4 2 1 TRANSMITTER AT 1Mbps OTHER TRANSMITTERS AT 30kbps 0 MBAUD = VCC -2 VOUT -4 -6 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF)
FIGURE 8. LOW SPEED TRANSMITTER OUTPUT VOLTAGE vs LOAD CAPACITANCE
FIGURE 9. HIGH SPEED TRANSMITTER OUTPUT VOLTAGE vs LOAD CAPACITANCE
25 MBAUD = GND
90 MBAUD = VCC 70 +SLEW SLEW RATE (V/s) +SLEW 50
20 SLEW RATE (V/s)
15 -SLEW 10 -SLEW
30 -SLEW 10
5 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF)
0 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF)
FIGURE 10. LOW SPEED SLEW RATE vs LOAD CAPACITANCE
FIGURE 11. HIGH SPEED SLEW RATE vs LOAD CAPACITANCE
55 MBAUD = GND 50 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 45 40 35 30 25 20 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF) 20kbps 120kbps 250kbps
90 MBAUD = VCC 80 70 60 50 250kbps 40 120kbps 30 20 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF) 1Mbps
FIGURE 12. LOW SPEED SUPPLY CURRENT vs LOAD CAPACITANCE WHEN TRANSMITTING DATA
FIGURE 13. HIGH SPEED SUPPLY CURRENT vs LOAD CAPACITANCE WHEN TRANSMITTING DATA
9
ICL3237 Typical Performance Curves
3.5 NO LOAD ALL OUTPUTS STATIC 3.0 SUPPLY CURRENT (mA) 2.5 2.0 1.5 1.0 0.5 0 2.5
VCC = 3.3V, TA = 25oC (Continued)
3.0
3.5
4.0
4.5
5.0
5.5
6.0
SUPPLY VOLTAGE (V)
FIGURE 14. SUPPLY CURRENT vs SUPPLY VOLTAGE
Die Characteristics
SUBSTRATE POTENTIAL (POWERED UP) GND TRANSISTOR COUNT 619 PROCESS Si Gate CMOS
10
ICL3237 Shrink Small Outline Plastic Packages (SSOP)
N INDEX AREA H E -B1 2 3 SEATING PLANE -AD -CA 0.25 0.010 L GAUGE PLANE 0.25(0.010) M BM
M28.209 (JEDEC MO-150-AH ISSUE B)
28 LEAD SHRINK SMALL OUTLINE PLASTIC PACKAGE INCHES SYMBOL A A1 A2 B C D E
A2 C 0.10(0.004) C AM BS
MILLIMETERS MIN 0.05 1.65 0.22 0.09 9.90 5.00 7.40 0.55 28 8 0 8 MAX 2.00 1.85 0.38 0.25 10.50 5.60 8.20 0.95 NOTES 9 3 4 6 7 Rev. 2 6/05
MIN 0.002 0.065 0.009 0.004 0.390 0.197 0.292 0.022 28 0
MAX 0.078 0.072 0.014 0.009 0.413 0.220 0.322 0.037
A1
e
B 0.25(0.010) M
e H L N
0.026 BSC
0.65 BSC
NOTES: 1. Symbols are defined in the "MO Series Symbol List" in Section 2.2 of Publication Number 95. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion and gate burrs shall not exceed 0.20mm (0.0078 inch) per side. 4. Dimension "E" does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.20mm (0.0078 inch) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. "L" is the length of terminal for soldering to a substrate. 7. "N" is the number of terminal positions. 8. Terminal numbers are shown for reference only. 9. Dimension "B" does not include dambar protrusion. Allowable dambar protrusion shall be 0.13mm (0.005 inch) total in excess of "B" dimension at maximum material condition. 10. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 11

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