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19-0498; Rev 0; 3/98
15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers
________________General Description
The MAX3095/MAX3096 are rugged, low-power, quad, RS-422/RS-485 receivers with electrostatic discharge (ESD) protection for use in harsh environments. All receiver inputs are protected to 15kV using IEC 10004-2 Air-Gap Discharge, 8kV using IEC 1000-4-2 Contact Discharge, and 15kV using the Human Body Model. The MAX3095 operates from a +5V supply, while the MAX3096 operates from a +3.3V supply. Receiver propagation delays are guaranteed to within 8ns of a predetermined value, thereby ensuring device-to-device matching across production lots. Complementary enable inputs can be used to place the devices in a 1nA low-power shutdown mode in which the receiver outputs are high impedance. When active, these receivers have a fail-safe feature that guarantees a logic-high output if the input is open circuit. They also feature a quarter-unit-load input impedance that allows 128 receivers on a bus. The MAX3095/MAX3096 are pin-compatible, low-power upgrades to the industry-standard '26LS32. They are available in a space-saving QSOP package.
____________________________Features
o ESD Protection: 15kV--IEC 1000-4-2, Air-Gap Discharge 8kV--IEC 1000-4-2, Contact Discharge 15kV--Human Body Model o Guaranteed Propagation-Delay Tolerance Between All ICs: 8ns (MAX3095) 10ns (MAX3096) o Single +3V Operation (MAX3096) Single +5V Operation (MAX3095) o 16-Pin QSOP (8-pin SO footprint) o 10Mbps Data Rate o Allow up to 128 Receivers on the Bus o 1nA Low-Power Shutdown Mode o 2.4mA Operating Supply Current o Pin-Compatible Upgrades to '26LS32
MAX3095/MAX3096
_______________Ordering Information
PART MAX3095CPE MAX3095CSE MAX3095CEE MAX3095EPE MAX3095ESE MAX3095EEE MAX3096CPE MAX3096CSE MAX3096CEE MAX3096EPE MAX3096ESE MAX3096EEE TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 16 Plastic DIP 16 Narrow SO 16 QSOP 16 Plastic DIP 16 Narrow SO 16 QSOP 16 Plastic DIP 16 Narrow SO 16 QSOP 16 Plastic DIP 16 Narrow SO 16 QSOP
________________________Applications
Telecommunications Equipment Rugged RS-422/RS-485/RS-423 Bus Receiver Receivers for ESD-Sensitive Applications Level Translators
________________Functional Diagram
VCC
G G A1
MAX3095 MAX3096
Y1
Pin Configuration
TOP VIEW
B1 1 A1 2 Y2 Y1 3 G4 Y3 Y2 5 A2 6 Y4 B2 7 GND 8 16 VCC 15 B4 14 A4
B1 A2 B2 A3 B3 A4 B4 GND
MAX3095 MAX3096
13 Y4 12 G 11 Y3 10 A3 9 B3
DIP/SO/QSOP 1
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers MAX3095/MAX3096
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ...............................................................7V Control Input Voltage (G, G).......................-0.3V to (VCC + 0.3V) Receiver Input Voltage (A_, B_)...........................................25V Receiver Output Voltage (Y_).....................-0.3V to (VCC + 0.3V) Continuous Power Dissipation (TA = +70C) Plastic DIP (derate 10.5mW/C above +70C) ............762mW SO (derate 8.7mW/C above +70C) ...........................696mW QSOP (derate 8.3mW/C above +70C) ......................667mW Operating Temperature Ranges MAX309_C_ _ .....................................................0C to +70C MAX309_E_ _...................................................-40C to +85C Storage Temperature Range .............................-65C to +160C 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.
DC ELECTRICAL CHARACTERISTICS--MAX3095
(VCC = 5V 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Receiver Differential Input Threshold Receiver Input Hysteresis Receiver Input Current (A_, B_) Enable Input Current (G, G) Enable Input High Voltage (G, G) Enable Input Low Voltage (G, G) Receiver Output High Voltage Receiver Output Low Voltage Three-State Current at Receiver Output Output Short-Circuit Current Receiver Input Resistance Supply Current ESD Protection (Note 2) VIH VIL VOH VOL IOZR IOSR RIN ICC IOUT = -4mA, VID = 200mV, G = VCC or G = GND, Figure 1 IOUT = 4mA, VID = -200mV, G = VCC or G = GND, Figure 1 0 VOUT VCC, G = GND and G = VCC 0 VOUT VCC, G = VCC or G = GND -7V VCM 12V No load, G = VCC or G = GND G = GND and G = VCC Human Body Model IEC1000-4-2 (Air-Gap Discharge) IEC1000-4-2 (Contact Discharge) 7 48 2.4 0.001 15 15 8 kV 3.5 10 VCC - 1.5 0.4 1 75 2.0 0.8 IIN SYMBOL VTH CONDITIONS -7V VCM 12V VCM = 0 VCC = 0 or 5.25V VIN = 12V VIN = -7V MIN -200 45 250 -200 1 TYP MAX 200 UNITS mV mV A A V V V V A mA k mA A
2
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15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers
SWITCHING CHARACTERISTICS--MAX3095
(VCC = 5V 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS VCC = 5V 5%, TA = TMIN to TMAX TA = +85C Input-to-Output Propagation Delay tPLH, tPHL VCC = 5.25V TA = +25C TA = -40C TA = +85C VCC = 4.75V Device-to-Device PropagationDelay Matching Propagation-Delay Skew (tPLH - tPHL) Output Enable Time to Low Level Output Enable Time to High Level Output Disable Time from Low Level Output Disable Time from High Level Maximum Data Rate tSK tZL tZH tLZ tHZ fMAX Figure 3 Figure 3 Figure 3 Figure 3 10 TA = +25C TA = -40C MIN 65 78 71 65 82 74 68 86 79 73 90 82 76 TYP MAX 98 94 87 81 98 90 84 16 -4 600 600 60 60 10 800 800 100 100 ns ns ns ns ns ns Mbps ns UNITS
MAX3095/MAX3096
|VID| = 3V, Figure 2
|VID| = 3V, Figure 2, matched conditions
DC ELECTRICAL CHARACTERISTICS--MAX3096
(VCC = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25C.) (Note 1) PARAMETER Receiver Differential Input Threshold Receiver Input Hysteresis Receiver Input Current (A_, B_) Enable Input Current (G, G) Enable Input High Voltage (G, G) Enable Input Low Voltage (G, G) Receiver Output High Voltage Receiver Output Low Voltage Three-State Current at Receiver Output Output Short-Circuit Current Receiver Input Resistance VIH VIL VOH VOL IOZR IOSR RIN IOUT = -1.5mA, VID = 200mV, G = VCC or G = GND, Figure 1 IOUT = 2.5mA, VID = -200mV, G = VCC or G = GND, Figure 1 0 VOUT VCC, G = GND and G = VCC 0 VOUT VCC, G = VCC or G = GND -7V VCM 12V 4 48 VCC - 0.4 0.4 1 60 2.0 0.8 IIN SYMBOL VTH CONDITIONS -7V VCM 12V VCM = 0 VCC = 0 or 3.6V VIN = 12V VIN = -7V MIN -200 45 250 -200 1 TYP MAX 200 UNITS mV mV A A V V V V A mA k 3
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15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers MAX3095/MAX3096
DC ELECTRICAL CHARACTERISTICS--MAX3096 (continued)
(VCC = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25C.) (Note 1) PARAMETER Supply Current ESD Protection (Note 2) SYMBOL ICC CONDITIONS No load, G = VCC or G = GND G = GND and G = VCC Human Body Model IEC1000-4-2 (Air-Gap Discharge) IEC1000-4-2 (Contact Discharge) MIN TYP 2.4 0.001 15 15 8 kV MAX 4.0 10 UNITS mA A
SWITCHING CHARACTERISTICS--MAX3096
(VCC = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS VCC = 3.0V to 3.6V, TA = TMIN to TMAX TA = +85C Input-to-Output Propagation Delay tPLH, tPHL VCC = 3.60V TA = +25C TA = -40C TA = +85C VCC = 3.00V Device-to-Device PropagationDelay Matching Propagation-Delay Skew (tPLH - tPHL) Output Enable Time to Low Level Output Enable Time to High Level Output Disable Time from Low Level Output Disable Time from High Level Maximum Data Rate tSK tZL tZH tLZ tHZ fMAX Figure 3 Figure 3 Figure 3 Figure 3 10 TA = +25C TA = -40C MIN 69 88 78 69 103 91 82 98 88 79 113 101 92 TYP MAX 123 108 98 89 123 111 102 20 -2 600 600 80 80 10 1000 1000 180 180 ns ns ns ns ns ns Mbps ns UNITS
|VID| = 3V, Figure 2
|VID| = 3V, Figure 2, matched conditions
Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referred to device ground, unless otherwise noted. Note 2: Receiver inputs (A_, B_).
4
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15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers
Typical Operating Characteristics
(VCC = 5V for MAX3095, VCC = 3.3V for MAX3096, TA = +25C, unless otherwise noted.)
MAX3095/MAX3096
OUTPUT CURRENT vs. OUTPUT LOW VOLTAGE
MAX3095-01
OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE
MAX3095-02
OUTPUT LOW VOLTAGE vs. TEMPERATURE
0.9 OUTPUT LOW VOLTAGE (V) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 MAX3096 MAX3095 IOUT = 8mA
MAX3095-03
-50 MAX3095 -40 OUTPUT CURRENT (mA)
30 25 OUTPUT CURRENT (mA) 20 15 10 MAX3096 5 0 MAX3095
1.0
-30
-20 MAX3096 -10
0 0 1 2 3 4 5 OUTPUT LOW VOLTAGE (V)
0 0 1 2 3 4 5 -40 -15 10 35 60 85 OUTPUT HIGH VOLTAGE (V) TEMPERATURE (C)
OUTPUT HIGH VOLTAGE vs. TEMPERATURE
MAX3095-04
SUPPLY CURRENT vs. TEMPERATURE
MAX3095-05
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
MAX3095-06
5 MAX3095 OUTPUT HIGH VOLTAGE (V) 4
3.0
20 SHUTDOWN SUPPLY CURRENT (nA)
2.8 SUPPLY CURRENT (mA)
15
3 MAX3096 2
2.6 MAX3095/MAX3096 2.4
10 MAX3095 MAX3096 5
1 IOUT = -8mA
2.2
0
2.0 -40 -15 10 35 60 85 -40 -15 10 35 60 85 TEMPERATURE (C) TEMPERATURE (C)
0 -40 -15 10 35 60 85 TEMPERATURE (C)
MAX3095 PROPAGATION DELAY vs. TEMPERATURE
MAX3095-07
MAX3096 PROPAGATION DELAY vs. TEMPERATURE
VID = 3V CL = 15pF
MAX3095-08
120
VID = 3V CL = 15pF
140 130 PROPAGATION DELAY (ns) 120 110 100 90 80
PROPAGATION DELAY (ns)
110
100
90
80
70 -40 -15 10 35 60 85 TEMPERATURE (C)
-40
-15
10
35
60
85
TEMPERATURE (C)
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5
15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers MAX3095/MAX3096
Typical Operating Characteristics (continued)
(VCC = 5V for MAX3095, VCC = 3.3V for MAX3096, TA = +25C, unless otherwise noted.) SHUTDOWN TIMING
MAX3095 TOC09
MAX3095 Y VOLTAGE
5V/div
MAX3096 Y VOLTAGE G VOLTAGE
2V/div
2V/div
TIME (200ns/div) CIRCUIT OF FIGURE 3, S1 OPEN, S2 CLOSED, S3 = 1V
Pin Description
PIN 1 2 3 NAME B1 A1 Y1 Inverting Receiver Input Noninverting Receiver Input Receiver Output. Enabled when G = high OR G = low. Y1 will be logic high if A1 > B1 by 200mV, and low if A1 < B1 by 200mV. It will be logic high if A1 and B1 remain floating. Otherwise, the state is undetermined. Y1 goes high impedance when the G = low and G = high. Receiver Output Enable High. A logic high on this input enables all receivers. When taken low and G is high, all receivers are shut down, and the outputs go high impedance. Receiver Output. Same functionality as Y1. Noninverting Receiver Input Inverting Receiver Input Ground Inverting Receiver Input Noninverting Receiver Input Receiver Output. Same functionality as Y1. Receiver Output Enable Low. A logic low on this pin enables all receivers. When G = high and G = low, all receivers are shut down, and the outputs go high impedance. Receiver Output. Same functionality as Y1. Noninverting Receiver Input Inverting Receiver Input Positive Supply FUNCTION
4 5 6 7 8 9 10 11 12 13 14 15 16 6
G Y2 A2 B2 GND B3 A3 Y3 G Y4 A4 B4 VCC
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15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers MAX3095/MAX3096
|VID| = 3V
VID R G = VCC or G = GND VID R OUT CL 15pF
VOL
IOL (+)
VOH
IOH (-) IN 1.5V 1.5V
3.0V
0V tPLH tPHL VCC OUT 1.5V 1.5V 0V
Figure 1. Receiver VOH and VOL
Figure 2. Receiver Propagation Delay
VCC +1V -1V S3 G VID R G CL 15pF 1k S2 S1 VCC
3V G 1.5V 1.5V 0 tZH tHZ VOH OUT 0.25V 1.5V 0 S1 OPEN S2 CLOSED S3 = 1V 0.25V S1 CLOSED S2 OPEN S3 = -1V OUT 1.5V tLZ tZL G
3V
0
VCC
VOL
Figure 3. Receiver Enable and Disable Times
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15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers MAX3095/MAX3096
_______________Detailed Description
15kV ESD Protection
As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges (ESD) encountered during handling and assembly. The MAX3095/MAX3096 receiver inputs have extra protection against static electricity found in normal operation. Maxim's engineers developed stateof-the-art structures to protect these pins against 15kV ESD, without damage. After an ESD event, the MAX3095/ MAX3096 continue working without latchup. ESD protection can be tested in several ways. The receiver inputs are characterized for protection to the following: 1) 15kV using the Human Body Model 2) 8kV using the Contact-Discharge Method specified in IEC 1000-4-2 (formerly IEC 801-2) 3) 15kV using the Air-Gap Method specified in IEC 1000-4-2 (formerly IEC 801-2) The main difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2. Because series resistance is lower in the IEC 1000-4-2 ESD test model (Figure 5a), the ESD-withstand voltage measured to this standard is generally lower than that measured using the Human Body Model. Figure 5b shows the current waveform for the 8kV IEC 1000-4-2 Level 4 ESD Contact-Discharge test. The Air-Gap test involves approaching the device with a charge probe. The Contact-Discharge method connects the probe to the device before the probe is energized.
Machine Model The Machine Model for ESD testing uses a 200pF storage capacitor and zero-discharge resistance. It mimics the stress caused by handling during manufacturing and assembly. Of course, all pins (not just RS-485 inputs) require this protection during manufacturing. Therefore, the Machine Model is less relevant to the I/O ports than are the Human Body Model and IEC 1000-4-2.
Low-Power Shutdown Mode
Table 1 shows the functionality of the enable inputs. The MAX3095/MAX3096 enter shutdown when G is low and G is high. In shutdown, all outputs go high impedance and the devices typically draw less than 1nA. The devices exit shutdown by taking G high or G low. The typical shutdown exit time is 600ns.
ESD Test Conditions ESD performance depends on a number of conditions. Contact Maxim for a reliability report that documents test setup, methodology, and results. Human Body Model Figure 4a shows the Human Body Model, and Figure 4b shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the device through a 1.5k resistor. IEC 1000-4-2 Since January 1996, all equipment manufactured and/or sold in the European community has been required to meet the stringent IEC 1000-4-2 specification. The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX3095/MAX3096 help you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2, without additional ESD-protection components.
Table 1. Function Table
G 1 1 1 X X X 0 G X X X 0 0 0 1 (A - B) 200mV -200mV Open 200mV -200mV Open X OUTPUT Y 1 0 1 1 0 1 High-Z DEVICE MODE On On On On On On Shutdown
X = don't care, High-Z = high impedance
8
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15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers MAX3095/MAX3096
RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 1.5k DISCHARGE RESISTANCE DEVICE UNDER TEST IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
Cs 100pF
STORAGE CAPACITOR
Figure 4a. Human Body ESD Test Model
Figure 4b. Human Body Model Current Waveform
RC 50M to 100M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
I 100% 90% IPEAK
Cs 150pF
STORAGE CAPACITOR
10% tr = 0.7ns to 1ns 30ns 60ns t
Figure 5a. IEC 1000-4-2 ESD Test Model
Figure 5b. IEC 1000-4-2 ESD-Generator Current Waveform
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9
15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers MAX3095/MAX3096
Applications Information
Propagation-Delay Matching
The MAX3095/MAX3096 exhibit propagation delays that are closely matched from one device to another, even between devices from different production lots. This feature allows multiple data lines to receive data and clock signals with minimal skewing with respect to each other. The MAX3095 receiver propagation delays are trimmed to a predetermined value 8ns, while the MAX3096 delays are trimmed to a predetermined value 10ns.
VCC 1k A
MAX3095 MAX3096
150
128 Receivers on the Bus
The standard RS-485 input impedance is 12k (oneunit load). The standard RS-485 transmitter can drive 32 unit loads. The MAX3095/MAX3096 present a 1/4unit-load input impedance (48k), which allows up to 128 receivers on a bus. Any combination of these RS485 receivers with a total of 32 unit loads can be connected to the same bus.
B 1k
Fail-Safe Implementation
The MAX3095/MAX3096 receiver inputs guarantee a logic high output when the inputs are open circuit (no termination resistor used). This occurs when the transmitter is removed from the bus or when all transmitter outputs are high impedance. However, when the line is terminated and the transmitters are disabled, the differential voltage between the A and B inputs falls below the 200mV RS-485 sensitivity threshold. Consequently, the outputs become undefined. To maintain a failsafe receiver output while using a terminating resistor, input A must be biased at least 200mV above input B. The resistor-divider network shown in Figure 6 is recommended.
Figure 6. External Fail-Safe Implementation
Chip Information
TRANSISTOR COUNT: 676
10
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15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers
Package Information
QSOP.EPS
MAX3095/MAX3096
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11
15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers MAX3095/MAX3096
Package Information (continued)
SOICN.EPS PDIPN.EPS
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) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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