Datasheet

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_______________General Description

The MAX3187 complete, dual DTE RS-232 serial port

meets the stringent ESD requirements of the European

Community. All transmitter outputs and receiver inputs

are protected to ±15kV using IEC 1000-4-2 Air-Gap

Discharge, ±8kV using IEC 1000-4-2 Contact

Discharge, and ±15kV using the Human Body Model.

The MAX3187’s six RS-232 transmitters and ten RS-232

receivers require no charge pump. Guaranteed to run

at data rates up to 230kbps, the MAX3187 is optimized

for desktop PC and motherboard applications, and is

compatible with popular software for PC communica-

tions. Power-supply current is less than 1mA for I

and I

, and less than 3mA for I

The MAX3187 is available in a space-saving 36-pin

SSOP package.

________________________Applications

Desktop PC

Motherboards

Instruments

Equipment Meeting IEC 1000-4-2

____________________________Features

♦ Enhanced ESD Protection:

±15kV—Human Body Model

±8kV—IEC 1000-4-2, Contact Discharge

±15kV—IEC 1000-4-2, Air-Gap Discharge

♦ Latchup Free During an ESD Event

♦ 36-Pin SSOP Package

♦ Guaranteed 230kbps Data Rate

♦ Flow-Through Pinout

♦ Two Complete DTE Serial Ports

♦ 6 RS-232 Drivers and 10 RS-232 Receivers

MAX3187

±15kV ESD-Protected, EMC-Compliant, 230kbps,

Dual RS-232 Serial Port for Motherboards/Desktops

________________________________________________________________

Maxim Integrated Products

R3IN

T1OUT

T2OUT

R4IN

T4OUT

T3OUT

R5IN

GND

R6IN

R7IN

R8IN

T4IN

R8OUT

R7OUT

R6OUT

R5OUT

T3IN

R4OUT

T2IN

T1IN

R3OUT

361 R1INR1OUT

2 R2INR2OUT

SSOP

TOP VIEW

MAX3187

T5OUT

R9IN

1918 R10INR10OUT

2017 T6OUTT6IN

R90UT

T5IN

19-1186; Rev 1; 10/98

PART

MAX3187CAX

MAX3187EAX -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

36 SSOP

______________Ordering Information

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

For small orders, phone 1-800-835-8769.

____________________________________________________________Pin Configuration

Typical Operating Circuit appears at end of data sheet.

Summary of content (8 pages)

PAGE 1
9-1186; Rev 1; 10/98 ±15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops ____________________________Features The MAX3187 complete, dual DTE RS-232 serial port meets the stringent ESD requirements of the European Community. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge, and ±15kV using the Human Body Model.
PAGE 2
MAX3187 ±15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops ABSOLUTE MAXIMUM RATINGS VCC ...........................................................................-0.3V to +7V VDD .........................................................................-0.3V to +14V VSS......................................................................... +0.3V to -14V Input Voltages T_IN ......................................................................-0.3V to +6V R_IN .
PAGE 3
±15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops (VCC = +4.5V to +5.5V, VDD = +10.8V to +13.2V, VSS = -10.8V to -13.2V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
__________________________________________Typical Operating Characteristics (VCC = +5V, VDD = +12V, VSS = -12V, TA = +25°C, unless otherwise noted.) 20 IDD, 20kbps ICC VCC = 5V 2 TRANSMITTERS AT DATA RATE ISS, 20kbps 4 TRANSMITTERS AT DATA RATE/16 3kΩ + CLOAD -10 ISS, 120kbps IDD, 120kbps 20 ICC 2 TRANSMITTERS AT DATA RATE 0 4 TRANSMITTERS AT DATA RATE/16 3kΩ + CLOAD ISS, 20kbps -10 ISS, 120kbps -20 -30 -40 12.0 12.6 0 13.2 3000 4000 1000 2000 3000 4000 240kbps -7.
PAGE 5
±15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops PIN NAME FUNCTION 1, 2, 3, 6, 8, 11, 12, 13, 16, 18 R1OUT–R10OUT 4, 5, 7, 14, 15, 17 T1IN–T6IN 9 VCC Supply-Voltage Input, 4.5V to 5.5V 10 VSS Supply-Voltage Input, -10.8V to -13.2V 27 GND Ground. Connect system to ground. 28 VDD Supply-Voltage Input, 10.8V to 13.
PAGE 6
MAX3187 ±15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops RC 1M CHARGE-CURRENT LIMIT RESISTOR RD 1500Ω IP 100% 90% DISCHARGE RESISTANCE Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES HIGHVOLTAGE DC SOURCE Cs 100pF STORAGE CAPACITOR DEVICE UNDER TEST 36.8% 10% 0 0 Figure 2a. Human Body ESD Test Model CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 150pF Figure 2b.
PAGE 7
±15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops __________Typical Operating Circuit 0.1µF +5V +12V VCC VDD 0.1µF 0.1µF MAX3187 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 ground, so be sure to minimize the ground-lead return path to the power supply. A separate return path to the power supply is recommend.
PAGE 8
________________________________________________________Package Information SSOP.EPS MAX3187 ±15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops 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.