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19-2403; Rev 0; 8/95
15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver
_______________General Description
The MAX1488E quad, low-power line driver is designed for EIA/TIA-232, EIA/TIA-562, and CCITT V.28 communications in harsh environments. Each transmitter output is protected against 15kV electrostatic discharge (ESD) shocks. The inputs are TTL and CMOS compatible with minimal loading. The outputs feature internally controlled slew-rate limiting and current limiting. This device has a guaranteed 120kbps data rate. Powersupply current is less than 180A over a 4.5V to 13.2V supply voltage range. The MAX1488E is pin compatible with the MC1488, MC14C88, SN75188, SN75C188, DS1488, and DS14C88. It is available in 14-pin plastic DIP and SO packages.
____________________________Features
o ESD Protection: 15kV--Human Body Model 6kV--IEC801-2, Contact Discharge 15kV--IEC801-2, Air-Gap Discharge o Latchup Free, Even During an ESD Event o Low 85A Supply Current from IEE or ICC o Guaranteed 120kbps Data Rate o No External Capacitors Required for Slew-Rate Limiting o Pin Compatible with MC1488, MC14C88, SN75188, SN75C188, DS1488, and DS14C88
MAX1488E
________________________Applications
PC Motherboards Modems Interface Data Terminal Equipment (DTE) with Data Circuit-Terminating Equipment (DCE) Equipment Meeting IEC1000-4-2 (formerly IEC801-2) or 15kV ESD Protection
______________Ordering Information
PART MAX1488ECPD MAX1488ECSD MAX1488EC/D MAX1488EEPD TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C -40C to +85C PIN-PACKAGE 14 Plastic DIP 14 SO Dice* 14 Plastic DIP 14 SO
MAX1488EESD -40C to +85C * Dice are specified at TA = +25C.
__________Typical Operating Circuit
__________________Pin Configuration
14 MAX1488E
14 MAX1489E
TOP VIEW
VEE 1 TTL/CMOS LOGIC INTERCONNECTING CABLE TTL/CMOS LOGIC INPUT A 2 OUTPUT A 3 INPUT B1 4
14 VCC
MAX1488E
13 INPUT D1 12 INPUT D2 11 OUTPUT D 10 INPUT C1 9 8 INPUT C2 OUTPUT C
14 MAX1489E
SIGNAL GROUND
14 MAX1488E
INPUT B2 5 OUTPUT B 6 GND 7
PC MOTHERBOARD (DTE)
MODEM (DCE)
DIP/SO
________________________________________________________________ Maxim Integrated Products
1
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15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver MAX1488E
ABSOLUTE MAXIMUM RATINGS
Positive Supply Voltage (VCC) .............................................+14V Negative Supply Voltage (VEE) .............................................-14V Input Voltage (VIN) .................................................-0.3V to +15V Driver Output Voltage ..........................................................15V Continuous Power Dissipation (TA = +70C) Plastic DIP (derate 10.00mW/C above +70C) ..........800mW SO (derate 8.7mW/C above +70C) ...........................695mW Operating Temperature Ranges MAX1488EC_D ...................................................0C to +70C MAX1488EE_D ................................................-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.
ELECTRICAL CHARACTERISTICS
(VCC = 4.5V to 13.2V, VEE = -4.5V to -13.2V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER DC CHARACTERISTICS VCC = -VEE = 5.0V, RL = 3k VCC = -VEE = 6.5V, RL = 3k VCC = -VEE = 12.0V, RL = 3k VCC = -VEE = 13.2V, RL = open VCC = -VEE = 5.0V, RL = 3k VCC = -VEE = 6.5V, RL = 3k VCC = -VEE = 12.0V, RL = 3k VCC = -VEE = 13.2V, RL = open 3.7 5 10 4.0 5.4 10.5 -4.5 -5.8 -10.8 -13.2 4.5 -13.2 No load No load Output shorted to ground (Note 1) -180 4 2.0 0.8 0 VCC = VEE = 0V IVOI 2.0V VCC = 4.5V, VEE = -4.5V, CL = 50pF tPLH VCC = 9.0V, VEE = -9.0V, CL = 50pF VCC = 12.0V, VEE = -12.0V, CL = 50pF Output Propagation Delay, High to Low Propagation Delay Skew, VCC = 4.5V, VEE = -4.5V, CL = 50pF tPHL VCC = 9.0V, VEE = -9.0V, CL = 50pF VCC = 12.0V, VEE = -12.0V, CL = 50pF VCC = 4.5V, VEE = -4.5V, CL = 50pF tSK VCC = 9.0V, VEE = -9.0V, CL = 50pF VCC = 12.0V, VEE = -12.0V, CL = 50pF Human Body Model ESD Protection IEC-1000-4-2 (Contact Discharge) IEC-1000-4-2 (Air-Gap Discharge) 2 300 2.4 2.8 3.1 2.1 2.4 2.6 0.25 0.42 0.42 15 6 15 kV s 3.5 3.9 4.2 4.5 5.1 5.4 s s 2 85 -85 20 45 13.2 -3.7 -5 -10 13.2 -4.5 180 SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Voltage High
VOH
V
Output Voltage Low
VOL VCC VEE ICC IEE IOS VIH VIL IIN1 RO
V
Operating Voltage Range Positive Supply Current Negative Supply Current Output Short-Circuit Current Input High Voltage Input Low Voltage Input Current Output Resistance
V A A mA V V A
TIMING CHARACTERISTICS (see Figure 1) Output Propagation Delay, Low to High
ItPLH - tPHLI
ESD CHARACTERISTICS
_______________________________________________________________________________________
15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 4.5V to 13.2V, VEE = -4.5V to -13.2V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL tR1 Output Rise Time tR2 tF1 Output Fall Time tF2 CONDITIONS CL = 1500pF, RL = 5k, VOUTPUT_ from -3.3V to 3.3V CL = 1500pF, RL = 5k, VOUTPUT_ from -3.0V to 3.0V CL = 1500pF, RL = 5k, VOUTPUT_ from -3.3V to 3.3V CL = 1500pF, RL = 5k, VOUTPUT_ from -3.0V to 3.0V CL = 15pF to 2500pF, RL = 3k to 7k, VCC = 12V, VEE = -12V, TA = +25C, VOUTPUT_ from -3.0V to 3.0V CL = 15pF to 2500pF, RL = 3k to 7k, VCC = 12V, VEE = -12V, TA = +25C 4 MIN TYP 850 ns 740 860 ns 765 MAX UNITS
MAX1488E
Output Slew Rate
SR
30
V/s
Guaranteed Data Rate
120
kbps
Note 1: The IOS value is for one output at a time. If more than one output is shorted simultaneously, damage may occur.
__________________________________________Typical Operating Characteristics
(VCC = 12V, VEE = -12V, TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX1488E TOC-1
SLEW RATE vs. LOAD CAPACITANCE
MAX1488E TOC-2
OUTPUT VOLTAGE vs. TEMPERATURE
VOH @ VCC = -VEE = 12V 10 OUTPUT VOLTAGE (V) 5 0 VOL @ VCC = -VEE = 4.5V -5 -10 -15 VOL @ VCC = -VEE = 12V RL= 3k -40 -20 0 20 40 60 80 100 VOH @ VCC = -VEE = 4.5V
MAX1488E TOC-3
15 RL= 5k 10 OUTPUT VOLTAGE (V) VOH 5 0 -5 VOL -10 -15 4 5 6 7 8 RL= 3k RL= 5k RL= 3k
11 RL= 3k 10 SLEW RATE (V/s) 9 8 7 FALLING EDGE 6 5 4 3 0 500 1000 1500 2000 RISING EDGE
15
9 10 11 12 13 14
2500 3000
VCC AND -VEE SUPPLIES (V)
LOAD CAPACITANCE (pF)
TEMPERATURE (C)
_______________________________________________________________________________________
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15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver MAX1488E
_____________________Pin Description
PIN 1 2, 4, 5, 9, 10, 12, 13 3, 6, 8, 11 7 14 NAME VEE INPUT_ OUTPUT_ GND VCC FUNCTION -4.5V to -13.2V Supply Voltage Input Driver Inputs Driver Outputs Ground +4.5V to +13.2V Supply Voltage Input
tF2 tF1 3.3V 3.0V VOUT -3.0V -3.3V 0V DRIVER INPUT 0V 3.0V 1.5V TPHL TPLH VOH
_______________Detailed Description
The MAX1488E provides 15kV of ESD protection when operating or when powered down. After an ESD event, the MAX1488E will not latch up. Internal slew-rate-limiting circuitry eliminates the need for external capacitors. The MAX1488E has a guaranteed 120kbps data rate.
tR2 VOL tR1
Outputs
Tables 1 and 2 describe the output states. The output voltage level is affected by both the load current and supply voltage, and is stable over temperature. Refer to the Typical Operating Characteristics to see how the output voltage varies with supply voltage, load capacitance, and temperature.
SIGNAL GENERATOR
RL
CL
Figure 1. Slew-Rate Test Circuit and Timing Diagram
Table 1. Driver A Functions
INPUT A H L OUTPUTA L H
Table 2. Driver B-D Functions
INPUT_1 H L INPUT_2 H X OUTPUT_ L H
X
L
H
operation. Maxim's engineers developed state-of-theart structures to protect these pins against ESD of 15kV, without damage. After an ESD event, the MAX1488E keeps working without latchup. ESD protection can be tested in various ways; the transmitter outputs are characterized for protection to the following: 1) 15kV using the Human Body Model 2) 6kV using the Contact-Discharge Method specified in IEC1000-4-2 (formerly IEC801-2) 3) 15kV using the Air-Gap Method specified in IEC1000-4-2 (formerly IEC801-2).
Inputs
The driver inputs determine the driver output states (Tables 1 and 2). Driver inputs B, C, and D have two inputs. Connect unused inputs to ground or VCC.
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 2a shows the Human Body Model, and Figure 2b 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 test device through a 1.5k resistor.
15kV ESD Protection
As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The MAX1488E driver outputs have extra protection against static electricity found in normal
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_______________________________________________________________________________________
15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver MAX1488E
R C 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE R D 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST HIGHVOLTAGE DC SOURCE R C 50M to 100M CHARGE-CURRENT LIMIT RESISTOR R D 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
Cs 100pF
STORAGE CAPACITOR
Cs 150pF
STORAGE CAPACITOR
Figure 2a. Human Body ESD Test Model
Figure 3a. IEC1000-4-2 ESD Test Model
IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) I PEAK
I 100% 90%
10% tDL CURRENT WAVEFORM t r = 0.7ns to 1ns 30ns 60ns t
Figure 2b. Human Body Model Current Waveform
Figure 3b. IEC1000-4-2 ESD Generator Current Waveform
IEC1000-4-2 The IEC1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX1488E helps you design equipment that meets Level 4 (the highest level) of IEC1000-4-2, without additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC1000-4-2 is higher peak current in IEC1000-4-2. Because series resistance is lower in the IEC1000-4-2 ESD test model (Figure 3a), the ESD withstand voltage measured to this standard is generally lower than that measured using the Human Body Model. Figure 3b shows the current waveform for the 6kV IEC1000-4-2 Level 4 ESD Contact-Discharge test. The Air-Gap test involves approaching the device with a charged 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. Its objective is to mimic the stress caused by contact that occurs with handling and assembly during manufacturing. Of course, all pins (not just RS-232 inputs and outputs) require this protection during manufacturing. Therefore, the Machine Model is less relevant to the I/O ports than the Human Body Model and IEC1000-4-2.
__________Applications Information
Use proper layout to ensure other devices on your board are not damaged in an ESD strike. Currents as high as 60A can instantaneously pass into the ground, so it is important to minimize the ground-lead return path to the power supply. A separate return path to the power supply is recommended. Trace widths should be greater than 40 mils. VCC and VEE must be bypassed with 0.1F capacitors as close to the part as possible to ensure maximum ESD protection.
_______________________________________________________________________________________
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15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver MAX1488E
___________________Chip Topography
V SS V DD
INPUT D1 INPUT A INPUT D2
0.134" (3.40mm)
OUTPUT A
OUTPUT D
INPUT B1 INPUT B2
INPUT C1 INPUT C2
OUTPUT B
OUTPUT C
GND 0.070" (1.78mm)
TRANSISTOR COUNT: 95 SUBSTRATE CONNECTED TO GND
6
_______________________________________________________________________________________
15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver
________________________________________________________Package Information
DIM INCHES MAX MIN 0.069 0.053 0.010 0.004 0.019 0.014 0.010 0.007 0.157 0.150 0.050 0.244 0.228 0.050 0.016 MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 3.80 4.00 1.27 5.80 6.20 0.40 1.27
MAX1488E
D A e B
0.101mm 0.004in.
0-8
A1
C
L
A A1 B C E e H L
E
H
Narrow SO SMALL-OUTLINE PACKAGE (0.150 in.)
DIM PINS D D D 8 14 16
INCHES MILLIMETERS MIN MAX MIN MAX 0.189 0.197 4.80 5.00 0.337 0.344 8.55 8.75 0.386 0.394 9.80 10.00
21-0041A
_______________________________________________________________________________________
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15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver MAX1488E
___________________________________________Package Information (continued)
E D A3 A A2 E1
DIM A A1 A2 A3 B B1 C D1 E E1 e eA eB L INCHES MAX MIN 0.200 - - 0.015 0.175 0.125 0.080 0.055 0.022 0.016 0.065 0.045 0.012 0.008 0.080 0.005 0.325 0.300 0.310 0.240 - 0.100 - 0.300 0.400 - 0.150 0.115 INCHES MIN MAX 0.348 0.390 0.735 0.765 0.745 0.765 0.885 0.915 1.015 1.045 1.14 1.265 MILLIMETERS MIN MAX - 5.08 0.38 - 3.18 4.45 1.40 2.03 0.41 0.56 1.14 1.65 0.20 0.30 0.13 2.03 7.62 8.26 6.10 7.87 2.54 - 7.62 - - 10.16 2.92 3.81 MILLIMETERS MIN MAX 8.84 9.91 18.67 19.43 18.92 19.43 22.48 23.24 25.78 26.54 28.96 32.13
21-0043A
L A1 e B D1
0 - 15 C B1 eA eB
Plastic DIP PLASTIC DUAL-IN-LINE PACKAGE (0.300 in.)
PKG. DIM PINS P P P P P N D D D D D D 8 14 16 18 20 24
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.
8 ___________________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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