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19-0199; Rev 1; 8/95
Programmable DTE/DCE, +5V RS-232 Transceiver
_______________General Description
The MAX214 +5V RS-232 transceiver provides a complete, 8-line, software-configurable, DTE or DCE port RS-232 interface. Tx, Rx, RTS, CTS, DTR, DSR, DCD, and RI circuits can be configured as either Data Terminal Equipment (DTE) or Data Circuit-Terminating Equipment (DCE) using the DTE/DCE control pin. The MAX214 eliminates the need to swap cables when switching between DTE and DCE configurations.
____________________________Features
o Eliminates Null Modem Cables o Programmable DTE or DCE Serial Port o 1F Charge-Pump Capacitors o 116kbps Data Rate--Guaranteed o 20A Shutdown Mode o Receivers Active in Shutdown
MAX214
________________________Applications
AT-Compatible Laptop Computers AT-Compatible Desktop Computers Modems, Printers, and Other Peripherals
______________Ordering Information
PART MAX214CPI MAX214CWI TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C PIN-PACKAGE 28 Plastic DIP 28 Wide SO Dice* 28 Plastic DIP 28 Wide SO
__________Typical Operating Circuit
+5V 1F 16 27 1F C1+ VCC V+ 28 C11 C2+ 2 C2DTE DCE 6 RA DTE 25 TB 23 RB DTE 24 TC DTE DCE 22 RC DCE 7 RDC DTE 8 21 26 3 RE DTE/DCE SHDN HI-Z GND 13 DTE DCE RTC 17 RDTC 11 RRE 12 TRC 18 DTE DCE RTB 19 TRB 20 RTA 10 TRA 9 1F 15
MAX214C/D MAX214EPI MAX214EWI
* Dice are specified at TA = +25C.
__________________Pin Configuration
TOP VIEW
MAX214
V-
1F
14 1F
5 TA
C2+ C2HI-Z N.C. TA RA RDC RE TRA
1 2 3 4 5 6 7 8 9
28 27 26 25
C1C1+ SHDN TB TC RB RC DTE/DCE TRB RTB TRC RTC VCC V+
MAX214
24 23 22 21 20 19 18 17 16 15
RTA 10 RDTC 11 RRE 12 GND 13 V- 14
DTE
DIP/SO
________________________________________________________________ Maxim Integrated Products
1
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Programmable DTE/DCE, +5V RS-232 Transceiver MAX214
ABSOLUTE MAXIMUM RATINGS
VCC ...........................................................................-0.3V to +6V Input Voltages TIN, DTE/DCE, SHDN HI-Z ......................-0.3V to (VCC + 0.3V) RIN ....................................................................................15V Output Voltages: TOUT ..................................................................................15V ROUT ........................................................-0.3V to (VCC + 0.3V) Short-Circuit (one output at a time) TOUT to GND ...........................................................Continuous ROUT to GND...........................................................Continuous Continuous Power Dissipation (TA = +70C) Plastic DIP (derate 9.09mW/C above +70C) .............727mW Wide SO (derate 12.50mW/C above +70C) ............1000mW Operating Temperature Ranges: MAX214C-I ..............................................0C to +70C MAX214E -I ..........................................-40C to +85C Storage Temperature Range ......................-65C to +150C Lead Temperature (soldering, 10sec) .......................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = 4.5V to 5.5V, C1 to C4 = 1F, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER RS-232 TRANSMITTERS Logic Input Threshold Low Logic Input Threshold High Logic Input Pull-Up Current Output Voltage Swing Transmitter Output Resistance Output Short-Circuit Current RS-232 RECEIVERS Input Voltage Operating Range Positive Threshold Input Low Positive Threshold Input High Positive Threshold Input Hysteresis Negative Threshold Input Low TA = +25C, VCC = 5V, normal operation, SHDN = 0V TA = +25C, VCC = 5V, normal operation, SHDN = 0V VCC = 5V, normal operation, SHDN = 0V (no hysteresis in shutdown) TA = +25C, VCC = 5V TA = +25C, VCC = 5V Normal operation, SHDN = 0V Shutdown, SHDN = 5V Normal operation, SHDN = 0V Shutdown, SHDN = 5V 0.2 3 100 3.5 0.2 -2.6 0.8 0.8 1.3 1.8 0.5 -1.9 1.3 -1.5 1.3 0.4 5 300 0.2 VCC - 0.2 -0.2 2.4 1.0 7 0.4 2.4 1.0 15 V V V V Normal operation Shutdown All transmitter outputs loaded with 3k to ground VCC = V+ = V- = 0V, VOUT = 2V (Note 1) VOUT = 0V 5.0 300 7 1 0.8 1.4 1.4 10 0.01 7.5 300k 25 2.0 50 1 V V A V mA CONDITIONS MIN TYP MAX UNITS
V
Negative Threshold Input High Negative Threshold Input Hysteresis Input Resistance TTL/CMOS Output Voltage Low TTL/CMOS Output Voltage High
V V k V V
VCC = 5V, normal operation, SHDN = 0V (no hysteresis in shutdown) HI-Z = 0V and SHDN = 0V HI-Z = 5V or SHDN = 5V IOUT = 3.2mA IOUT = -1.0mA
2
_______________________________________________________________________________________
Programmable DTE/DCE, +5V RS-232 Transceiver MAX214
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 4.5V to 5.5V, C1 to C4 = 1F, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER POWER SUPPLY VCC Supply Current Shutdown Supply Current No load, TA = +25C DTE/DCE = 0V, SHDN = HI-Z = VCC , Figure 1 TA = +25C TA = TMIN to TMAX 0.8 1.3 1.3 2.0 1 9 4 20 20 50 mA A CONDITIONS MIN TYP MAX UNITS
CONTROL LOGIC (DTE/DCE, SHDN, HI-Z) Logic Input Threshold Low Logic Input Threshold High Input Leakage Current AC CHARACTERISTICS Data Rate Normal operation, transmitters and receivers Receivers in shutdown mode TA = +25C, VCC = 5V, RL = 3k to 7k, CL = to 2500pF, measured from 3V to -3V or -3V to 3V tPHLT tPLHT tPHLT - tPLHT tPHLR, t PLHR tPHLR tPLHR 6 200 20 12 1.3 1.4 100 0.4 0.4 1.5 100 1.5 10 10 30 3.5 3.5 116 kbps V
V
A
Transition-Region Slew Rate Transmitter Propagation Delay, TTL to RS-232 (Normal Operation) Transmitter + to - Propagation-Delay Difference (Normal Operation) Receiver Propagation Delay, RS-232 to TTL (Normal Operation) Receiver Propagation Delay, RS-232 to TTL (Shutdown Mode)
V/s
s ns s s ns
Receiver Propagation-Delay Difference tPHLT - tPLHT (Normal Operation) MODE-CHANGE TIMING (DTE/DCE) Transmitter Enable Time Transmitter Disable Time Transmitter DTE/DCE Switch Time Receiver DTE/DCE Switch Time Receiver Termination-Resistor Connect/Disconnect Time Receiver Termination-Resistor Connect Entering SHDN Time Receiver Termination-Resistor Disconnect Exiting SHDN Time tTEN (includes charge-pump start-up time) tTTR tTSW tRSW (SHDN = 0V)
250 600 600 300 300 250 300
s ns ns ns ns s ns
Note 1: The 300 minimum is the EIA/TIA-232E specification, but the actual resistance when in shutdown mode or when VCC = 0V is typically 300k.
_______________________________________________________________________________________
3
Programmable DTE/DCE, +5V RS-232 Transceiver MAX214
__________________________________________Typical Operating Characteristics
(VCC = 5V, C1 to C4 = 1F, all transmitters loaded with 3k in parallel with 2.5nF, TA = +25C, unless otherwise noted.)
TRANSMITTER OUTPUT VOLTAGE (VOL) vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES
MAX214-01
TRANSMITTER OUTPUT VOLTAGE (VOH) vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES
MAX214-02
TRANSMITTER OUTPUT VOLTAGE (VOH ) vs. VCC POSITIVE SUPPLY VOLTAGE
1 TRANSMITTER LOADED 8.5 2 TRANSMITTERS LOADED 3 TRANSMITTERS LOADED
MAX214-03
MAX214-06
-5.5 -6.0 -6.5 V OL (V)
7.6 20kbps 7.4 7.2 64kbps 7.0 V OH (V) 6.8 6.6 120kbps
9.0
120kbps
-7.0 -7.5
64kbps
V OH (V)
8.0
7.5
20kbps -8.0 -8.5 0 1000 2000 3000 4000 5000 6000 7000 LOAD CAPACITANCE (pF)
6.4
7.0
6.2 6.0 0 1000 2000 3000 4000 5000 6000 7000 LOAD CAPACITANCE (pF)
DATA RATE = 0kbps 6.5 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 V CC (V)
TRANSMITTER OUTPUT VOLTAGE (VOL) vs. POSITIVE SUPPLY VOLTAGE
MAX214-04
TRANSMITTER OUTPUT VOLTAGES vs. V+, V- LOAD CURRENT
MAX214-05
SLEW RATE vs. LOAD CAPACITANCE
20 18 16 SLEW+ 3 TRANSMITTERS LOADED SLEW3 TRANSMITTERS LOADED SLEW+ 1 TRANSMITTER LOADED
-7.0 3 TRANSMITTERS LOADED -7.5 2 TRANSMITTERS LOADED 1 TRANSMITTER LOADED V OL (V) -8.0
10 8 6 T OUT +, T OUT- (V) V+ AND VEQUALLY 0 LOADED 2 -2 -4 -6 ALL TRANSMITTERS UNLOADED, 0kbps V- LOADED, NO LOAD ON V+ V+ LOADED, NO LOAD ON V-
SLEW RATE (V/s)
4
14 12 10 8
-8.5
-9.0 DATA RATE = 0kbps -9.5 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 V CC (V)
-8 -10 0 20 40 60 LOAD CURRENT (mA) 80
SLEW6 1 TRANSMITTER LOADED 4 0 2000 4000 6000 LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
Programmable DTE/DCE, +5V RS-232 Transceiver
______________________________________________________________Pin Description
PIN 1, 2 3 4 5, 24, 25 6, 8, 22, 23 7 9, 18, 20 10, 17, 19 11 12 13 14 15 16 21 26 27, 28 NAME C2+, C2HI-Z N.C. TA, TC, TB RA, RE, RC, RB RDC TRA, TRC, TRB RTA, RTC, RTB RDTC RRE GND VV+ VCC DTE/DCE SHDN C1+, C1FUNCTION Terminals for negative charge-pump capacitor RS-232 receiver impedance control. Take high to disconnect the termination resistor. No connect--not internally connected TTL/CMOS driver A, C, B inputs TTL/CMOS receiver A, E, C, B outputs TTL/CMOS DTE receiver output D for DTE/DCE = 0V, or TTL/CMOS DCE receiver output C for DTE/DCE = +5V RS-232 DTE driver output for DTE/DCE= 0V, or RS-232 DCE receiver input for DTE/DCE = +5V RS-232 DTE receiver input for DTE/DCE = 0V, or RS-232 DCE driver output for DTE/DCE = +5V RS-232 DTE receiver input D for DTE/DCE = 0V, or RS-232 DCE driver output C for DTE/DCE = +5V RS-232 receiver input Ground -2VCC voltage generated by the charge pump +2VCC voltage generated by the charge pump +4.5V to +5.5V supply voltage Data terminal equipment (DTE) and data circuit-terminating equipment (DCE) control pin. DCE active high and DTE active low. Shutdown control; shutdown high, normal operation low Terminals for positive charge-pump capacitor
MAX214
_______________Detailed Description
The MAX214 RS-232 transceiver provides a complete, 8-line, software-configurable, DTE or DCE port RS-232 interface. Tx, Rx, RTS, CTS, DTR, DSR, DCD, and RI circuits can be configured as either Data Terminal Equipment (DTE) or Data Circuit-Terminating Equipment (DCE) using the DTE/DCE control pin. The MAX214 eliminates the need to swap cables when switching between DTE and DCE configurations. This is useful when, for example, a portable computer is required to communicate with printers, modems, and other computers without carrying multiple cables. The MAX214 runs from a single +5V supply and incorporates a dual charge-pump voltage converter to generate the necessary voltages for the RS-232 transmitters. A shutdown mode is provided to save power when transmission is not required, but the receivers always stay active for simple detection of ring indicator signals.
DTE/DCE Operation
The DTE/DCE pin allows circuit configuration under software control. Tables 1a and 1b show the pin definitions of the MAX214 in both DTE and DCE modes. The Function columns show the direction of data flow from the input pin to the output pin of the MAX214, and onto the corresponding DB-25 connector's pin.
+5V to 10V Dual Charge-Pump Voltage Converter
The +5V to 10V conversion is performed by two charge-pump voltage converters (Figure 2). The first uses capacitor C1 to double the +5V to +10V, storing the +10V on the output filter capacitor, C3. The second charge-pump voltage converter uses C2 to invert the +10V to -10V, storing the -10V on the V- output filter capacitor, C4. In shutdown mode, V+ is pulled to VCC by an internal resistor, and V- falls to GND.
5
_______________________________________________________________________________________
Programmable DTE/DCE, +5V RS-232 Transceiver MAX214 MAX214
Table 1a. DTE-Operation Pin Configurations
TTL/CMOS I/O LABEL Transmitter (TxD) Receiver (RxD) Request to Send (RTS) Clear to Send (CTS) Data Terminal Ready (DTR) Data Set Ready (DSR) Detector Carrier Data (DCD) Ring Indicator (RI) MAX214 PIN 5 6 25 23 24 22 7 8 FUNCTION MAX214 PIN 9 10 20 19 18 17 11 12 RS-232 I/O LABEL TxD RxD RTS CTS DTR DSR DCD RI DB-25 PIN 2 3 4 5 20 6 8 22 + INPUT THRESHOLD
-
+ +
Table 1b. DCE-Operation Pin Configurations
MAX214 PIN 5 6 25 23 FUNCTION MAX214 PIN 10 9 19 20 17 24 11 22 18 7 8 12 RI 22 DTR 20 DCD 8 RS-232 I/O LABEL RxD TxD CTS RTS DSR DB-25 PIN 3 2 5 4 6 + INPUT THRESHOLD
-
+
6
_______________________________________________________________________________________
Programmable DTE/DCE, +5V RS-232 Transceiver
RS-232 Drivers
ISHDN +5.5V 1F C1+ 1F C1VCC V+ 1F 1F
MAX214
MAX214
C2+ +5V 1F C2400k Tx
V-
+5.5V
TIN Rx
TOUT 3k RIN 5k +5.5V
ROUT 0V OR +5.5V DRIVE +5.5V +5.5V DTE/DCE HI-Z SHDN
With VCC = 5V, the typical driver output voltage swing is 8V when loaded with a nominal 5k RS-232 receiver. Under worst-case operating conditions (including 116kbps data rate, 3k 2500pF load, VCC = 4.5V, maximum rated temperature) the output swing is guaranteed to meet the 5V minimum specified by EIA/TIA-232 and V.28. The open-circuit output voltage swing ranges from (V+ - 0.6V) to V-. Input thresholds are both CMOS and TTL compatible. The inputs of unused drivers can be left unconnected because 400k pull-up resistors to VCC are included on-chip. Since all drivers invert, the pull-up resistors force the outputs of unused drivers low. The input pull-up resistors typically source 10A; in shutdown mode, they are disconnected to reduce supply current. When in low-power shutdown mode, the driver outputs are turned off and their leakage current is less than 1A, even if the transmitter output is back-driven with voltages up to 15V.
GND
CAPACITORS MAY BE POLARIZED OR UNPOLARIZED
RS-232 Receivers
The receivers convert the RS-232 signals to CMOS-logic levels. They invert, to match the inversion of RS-232 drivers. The guaranteed receiver input thresholds are significantly tighter than the 3V thresholds required by the EIA/TIA-232E specification,
Figure 1. MAX214 Shutdown-Current Test Circuit
V+ S1 V CC C1+ C1 S2 C3 S5 C2+ S6 C2 C4 S8 VC2GND IL RL -
IL +
RL +
S3 GND C1-
S4 V CC
S7
120kHz
Figure 2. Charge-Pump Diagram
_______________________________________________________________________________________
7
Programmable DTE/DCE, +5V RS-232 Transceiver MAX214
Table 2. Control Pin Configurations
CONTROL INPUTS SHUTDOWN 0 0 0 0 1 1 1 1 HI-Z 0 0 1 1 0 0 1 1 DTE/DCE 0 1 0 1 0 1 0 1 TRA, TRB, TRC Transmit Mode Receive Mode/5k Transmit Mode Receive Mode/HI-Z Disabled/HI-Z Slow Receive/HI-Z Disabled/HI-Z Slow Receive/HI-Z RS-232 PINS RTA, RTB, RTC, RDTC Receive Mode/5k Transmit Mode Receive Mode/HI-Z Transmit Mode Slow Receive/HI-Z Disabled/HI-Z Slow Receive/HI-Z Disabled/HI-Z RRE Receive Mode/5k Receive Mode/5k Receive Mode/HI-Z Receive Mode/HI-Z Slow Receive/HI-Z Slow Receive/HI-Z Slow Receive/HI-Z Slow Receive/HI-Z
which improves noise margins. The polarity of each receiver's input threshold is shown in Tables 1a and 1b. In normal operating mode, receiver inputs are internally connected to ground with 5k resistors. So unconnected receivers with positive input thresholds have high outputs, and those with negative input thresholds have low outputs. When shut down, all receivers have positive thresholds. This allows the receiver inputs to respond to TTL-/CMOS-logic levels, as well as RS-232 levels. The guaranteed 0.8V input threshold ensures that receivers shorted to ground will have a logic 1 output. Also, the 300k input resistance to ground ensures that a receiver with its input left open will also have a logic 1 output. The receiver's 0.5V of hysteresis provides clean output transitions, even with slow rise-time and fall-time signals with moderate amounts of noise and ringing. The receivers have no hysteresis in shutdown mode.
Shutdown Control
In shutdown mode, the charge pumps are turned off, V+ is pulled down to VCC, V- is pulled to ground, and the transmitter outputs are disabled. This reduces supply current typically to 4A. The time required to exit shutdown is about 250s, as shown in Figure 3.
Receivers Receiver outputs never go into a high-impedance state; they are always active, even in shutdown mode (see Table 2). These awake-in-shutdown receivers are useful for monitoring external activity (for example, on RI), while maintaining minimal power consumption. Receivers in shutdown mode are slower (20kbps) than when not shut down (116kbps), and lack the hysteresis present in normal operation. Drivers The driver outputs are high impedance in shutdown mode, even when back-driven with voltages up to 15V.
HI-Z Control The receiver inputs are terminated with 5k resistors, to comply with the requirements of EIA/TIA-232E. However, these internal resistors can be disconnected by taking the HI-Z control pin to a logic high. This makes all of the MAX214's receiver inputs high impedance, and facilitates the transmission of RS-232 data from a single transmitter to multiple receivers. In this case, all but one of the receiving ICs should be put into the high input-impedance state.
__________Applications Information
Capacitor Selection
The type of capacitor (C1 to C4) used is not critical for proper operation. The MAX214 requires 1F capacitors, although in all cases capacitors of up to 10F can be used without harm. Ceramic dielectrics are suggested for the 1F capacitors.
8
_______________________________________________________________________________________
Programmable DTE/DCE, +5V RS-232 Transceiver
When using the minimum recommended capacitor values, make sure the capacitance value does not degrade excessively as the operating temperature varies. If in doubt, use capacitors with a larger nominal value (for example, 2 times larger). The effective series resistance (ESR) of the capacitors may vary over temperature and increase when below 0C. ESR influences the amount of ripple on V+ and V-, so if low ripple is required over wide temperature ranges, use larger capacitors or low-ESR types. To reduce the output impedance at V+ and V-, use larger capacitors (up to 10F). This can be useful when "stealing" power from V+ or from V-. pump capacitor sizes up to 10F reduces the impedance of the V+ and V- outputs.
MAX214
High Data Rates
The MAX214 maintains the RS-232 5.0V minimum driver output voltage even at high data rates. The Typical Operating Characteristics show transmitter output voltage levels driving 3k in parallel with various capacitive loads at data rates up to 120kbps.
+10V A +5V 0V -5V +5V 0V B -10V C
Driver Outputs when Exiting Shutdown
Figure 3 shows the MAX214 driver outputs when exiting shutdown. As they become active, the two driver outputs are shown going to opposite RS-232 levels (one driver input is high, the other is low). Each driver is loaded with 3k in parallel with 2.5nF.
Power-Supply Bypassing
Decouple VCC to ground with a capacitor of the same value as the charge-pump capacitors.
A = TRANSMITTER OUTPUT HIGH, +5V/div B = TRANSMITTER OUTPUT LOW, +5V/div C = SHDN INPUT, +5V/div HORIZONTAL = 200s
V+ and V- as Power Supplies
A small amount of power can be drawn from V+ and V-, although this will reduce noise margins. See the Output Voltage vs. Load Current graph in the Typical Operating Characteristics. Increasing the charge-
Figure 3. Transmitter Outputs When Exiting Shutdown
_______________________________________________________________________________________
9
Programmable DTE/DCE, +5V RS-232 Transceiver MAX214
PC1 (DTE MODE)
STANDARD RS-232 CABLE
PC2 (DCE MODE)
5 6 25 23 24 22
TA RA TB RB TC RC
TRA RTA TRB RTB TRC RTC
9 10 20 19 18 17
3 2 7 8 4 6
TxD RxD RTS CTS DTR DSR
3 2 7 8 4 6
9 10 20 19 18 17
TRA RTA TRB RTB TRC RTC
TA 5 RA 6 TB 25 RB 23 TC 24 RC 22
7
RDC
RDTC
11
1
DCD
1
11
RDTC
RDC 7
MAX214
8 HIGH HI-Z 3 SHDN 26 DTE/DCE 21 DB-9 CONNECTORS HI-Z 3 RE RRE 12 9 RI 9 12 RRE
MAX214
RE 8 HIGH SHDN 26 DTE/DCE 21 V CC
POWER CONNECTIONS OMITTED FOR CLARITY.
Figure 4. Typical Application Circuit Showing 2 PCs with Both DTE and DCE Operation
10
______________________________________________________________________________________
Programmable DTE/DCE, +5V RS-232 Transceiver
Table 3. Summary of EIA/TIA-232E, V.28 Specifications
PARAMETER Driver Output Voltage 0 Level 1 Level Output Level, Max Data Rate Receiver Input Voltage 0 Level 1 Level Input Level, Max Instantaneous Slew Rate, Max Driver Output Short-Circuit Current, Max Transition Rate on Driver Output Driver Output Resistance V.28 EIA/TIA-232E 3k RL 7k, CL 2500pF CONDITIONS 3k to 7k load 3k to 7k load No load 3k RL 7k, CL 2500pF EIA/TIA-232E, V.28 SPECIFICATIONS +5.0V to +15V
TA
___________________Chip Topography
C2- C1C2+ SHDN TB TC
MAX214
HI-Z
C1+
-5.0V to -15V 25V Up to 20kbits/sec
RDC RC RA RB
+3.0V to +15V -3.0V to -15V 25V 30V/s
TRA RTA TRB RTB RE
0.178" 4.52mm
DTE/DCE
100mA
RRE GND VV+ VCC TRC RTC
1ms or 3% of the period 4% of the period
RDTC
0.156" 3.96mm
-2V < VOUT < +2V 300
TRANSISTOR COUNT: 694; SUBSTRATE CONNECTED TO V+.
Table 4. DB9/DB25 Cable Connections Commonly Used for EIA/TIA-232 and V.24 Asynchronous Interfaces
DB9 PIN 1 2 3 4 5 6 7 8 9 DB25 PIN 8 3 2 20 7 6 4 5 22 NAME Received Line Signal Detector, sometimes called Data Carrier Detect Receive Data Transmit Data Data Terminal Ready Signal Ground Data Set Ready Request to Send Clear to Send Ring Indicator SYMBOL DCD RxD TxD DTR GND DSR RTS CTS RI FUNCTION Handshake from DCE Data from DCE Data from DTE Handshake from DTE Reference point for signals Handshake from DCE Handshake from DTE Handshake from DCE Handshake from DCE 11
______________________________________________________________________________________
Programmable DTE/DCE, +5V RS-232 Transceiver MAX214
________________________________________________________Package Information
DIM INCHES MAX MIN 0.200 - - 0.015 0.175 0.125 0.080 0.055 0.020 0.016 0.065 0.045 0.012 0.008 1.470 1.430 0.090 0.050 0.625 0.600 0.575 0.525 0.100 BSC 0.600 BSC 0.700 - 0.150 0.125 15 0 MILLIMETERS MIN MAX - 5.08 0.38 - 3.18 4.45 1.40 2.03 0.41 0.51 1.14 1.65 0.20 0.30 36.32 37.34 1.27 2.29 15.24 15.88 13.34 14.61 2.54 BSC 15.24 BSC - 17.78 3.18 3.81 0 15
21-342A
D1
E A2 A D A3 E1
A A1 A2 A3 B B1 C D D1 E E1 e eA eB L
A1 L
e B1 B eA eB
C
28-PIN PLASTIC DUAL-IN-LINE PACKAGE
DIM A A1 B C D E e H h L
E
H
INCHES MAX MIN 0.104 0.093 0.012 0.004 0.019 0.014 0.013 0.009 0.713 0.697 0.299 0.291 0.050 BSC 0.419 0.394 0.030 0.010 0.050 0.016 8 0
MILLIMETERS MIN MAX 2.35 2.65 0.10 0.30 0.35 0.49 0.23 0.32 17.70 18.10 7.40 7.60 1.27 BSC 10.00 10.65 0.25 0.75 0.40 1.27 0 8
21-343A
D A
0.127mm 0.004in.
h x 45
e
B
A1
C
L
28-PIN PLASTIC SMALL-OUTLINE PACKAGE
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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