_______________Detailed Description

±15kV ESD Protection

As with all Maxim devices, ESD-protection structures

are incorporated on all pins to protect against electro-

static discharges encountered during handling and

assembly. The MAX3186 driver outputs and receiver

inputs have extra protection against static electricity

found in normal operation. Maxim’s engineers devel-

oped state-of-the-art structures to protect these pins

against ESD of ±15kV, without damage. After an ESD

event, the MAX3186 continues working without latchup.

ESD protection can be tested in several ways. The

transmitter outputs and the receiver inputs are charac-

terized for protection to the following:

1) ±15kV using the Human Body Model

2) ±8kV 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)

ESD Test Conditions

ESD performance depends on a number of conditions.

Contact Maxim for a reliability report that documents

test setup, methodology, and results.

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

RS-232 Serial Port for Modems

_______________________________________________________________________________________

5

______________________________________________________________Pin Description

PIN

NAME

FUNCTION

1

Supply-Voltage Input, +10.8V to +13.2V

2, 4, 7, 8, 9

T1OUT–T5OUT

3, 5, 6

R1IN, R2IN, R3IN

Receiver Inputs

10

Supply-Voltage Input, -10.8V to -13.2V

11

GND

Ground. Connect to system ground.

12, 13, 14, 17, 19

T5IN–T1IN

Transmitter Inputs

15, 16, 18

R3OUT, R2OUT, R1OUT

20

Supply-Voltage Input, +4.5V to +5.5V

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

Cs

150pF

HIGH-

VOLTAGE

DC

SOURCE

DEVICE

UNDER

TEST

Figure 1b. IEC1000-4-2 ESD Generator Current Waveform

30ns

60ns

t

100%

90%

10%

I

Figure 1a. IEC1000-4-2 ESD Test Model