Datasheet

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_______________General Description

The MAX3185 is a complete DTE RS-232 serial port

designed to meet the stringent ESD requirements of the

European community. All transmitter outputs and receiv-

er 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 MAX3185 has three RS-232 transmitters, five RS-

232 receivers, and no charge pump, optimizing it for

operation in desktop PC and motherboard applications.

It is guaranteed to run at data rates up to 230kbps, pro-

viding compatibility with popular software for communi-

cating with personal computers. Power-supply current

is less than 300µA for I

and I

, and less than 1mA

for I

The MAX3185 is pin and functionally compatible with

the industry-standard 75185, so existing designs can

instantly become EMC compliant. The MAX3185 is

available in an SO package and in the tiny SSOP that

further reduces board space.

________________________Applications

Desktop PC

Motherboards

Instruments

Equipment Meeting IEC1000-4-2

____________________________Features

♦ Enhanced ESD Protection:

±15kV—Human Body Model

±8kV—IEC1000-4-2, Contact Discharge

±15kV—IEC1000-4-2, Air-Gap Discharge

♦ Latchup Free During an ESD Event

♦ 20-Pin SSOP and SO Packages

♦ Guaranteed 230kbps Data Rate

♦ Flow-Through Pinout

♦ Pin Compatible with SN75C185

♦ Complete DTE Serial Port

MAX3185

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

RS-232 Serial Port for Motherboards/Desktop PCs

________________________________________________________________

Maxim Integrated Products

R1OUT

R2OUT

R3OUT

R3IN

R2IN

R1IN

TOP VIEW

T1IN

T2IN

R4OUT

T3IN

T3OUT

R4IN

T2OUT

T1OUT

R5OUT

GND

R5IN

SO/SSOP

MAX3185

__________________Pin Configuration

MAX3186 MAX3185

RS-232

INTERCONNECTING

CABLE

TTL/CMOS

LOGIC

I/O

TTL/CMOS

LOGIC

I/O

__________Typical Operating Circuit

19-1076; Rev 0; 9/96

PART

MAX3185CWP

MAX3185CAP 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

20 SO

20 SSOP

______________Ordering Information

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

MAX3185EWP -40°C to +85°C 20 SO

MAX3185EAP -40°C to +85°C 20 SSOP

Summary of content (8 pages)

PAGE 1
9-1076; Rev 0; 9/96 ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs ________________________Applications Desktop PC Motherboards ____________________________Features ♦ Enhanced ESD Protection: ±15kV—Human Body Model ±8kV—IEC1000-4-2, Contact Discharge ±15kV—IEC1000-4-2, Air-Gap Discharge ♦ Latchup Free During an ESD Event ♦ 20-Pin SSOP and SO Packages ♦ Guaranteed 230kbps Data Rate ♦ Flow-Through Pinout ♦ Pin Compatible with SN75C185 ♦ Complete DTE Serial Port
PAGE 2
MAX3185 ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs ABSOLUTE MAXIMUM RATINGS VCC ...........................................................................-0.3V to +7V VDD .........................................................................-0.3V to +14V VSS......................................................................... +0.3V to -14V Input Voltages TIN ........................................................................-0.3V to +6V RIN ....
PAGE 3
±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs (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 = +5.0V, VDD = +12.0V, VSS = -12.0V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT vs. LOAD CAPACITANCE 2 TRANSMITTERS AT DATA RATE / 16 0 3kΩ + 2500pF LOAD ISS, 20kbps ISS, 120kbps ISS, 240kbps -20 10.8 12.5 12.0 12.6 -7.
PAGE 5
±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs PIN NAME FUNCTION 1 VDD 12, 14, 17, 18, 19 R5OUT–R1OUT Supply-Voltage Input, +10.8V to +13.2V Receiver Outputs, swing between GND and VCC 16, 15, 13 T3IN, T2IN, T1IN Transmitter Inputs 10 VSS Supply-Voltage Input, -10.8V to -13.2V 11 GND Ground. Connect system to ground.
PAGE 6
MAX3185 ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs 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 device through a 1.5kΩ resistor.
PAGE 7
±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs TRANSISTOR COUNT: 217 3.0V DRIVER INPUT 0V 1.5V TPHL TPLH VOH 3.3V 3.0V VOUT 0V -3.0V -3.3V tF2 tR2 tF1 tR1 VOL SIGNAL GENERATOR RL CL Figure 3.
PAGE 8
MAX3185 ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs ________________________________________________________Package Information DIM D 0°- 8° A e B 0.101mm 0.004in. A1 C L A A1 B C E e H L INCHES MAX MIN 0.104 0.093 0.012 0.004 0.019 0.014 0.013 0.009 0.299 0.291 0.050 0.419 0.394 0.050 0.016 DIM PINS E Wide SO SMALL-OUTLINE PACKAGE (0.300 in.) H D D D D D 16 18 20 24 28 INCHES MIN MAX 0.398 0.413 0.447 0.463 0.496 0.512 0.598 0.614 0.697 0.