MAX3185CAP Просмотр технического описания (PDF) - Maxim Integrated

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MAX3185CAP

±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs

Maxim Integrated 

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

RS-232 Serial Port for Motherboards/Desktop PCs

______________________________________________________________Pin Description

PIN

1

12, 14, 17, 18, 19

16, 15, 13

10

11

2, 3, 4, 7, 9

5, 6, 8

20

NAME

FUNCTION

VDD

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

R5OUT–R1OUT

Receiver Outputs, swing between GND and VCC

T3IN, T2IN, T1IN

Transmitter Inputs

VSS

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

GND

Ground. Connect system to ground.

R1IN–R5IN

Receiver Inputs

T1OUT, T2OUT, T3OUT Transmitter Outputs, swing between VDD and VSS

VCC

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

RC 50M to 100M

RD 330Ω

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

HIGH-

VOLTAGE

DC

SOURCE

Cs

150pF

STORAGE

CAPACITOR

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

I

100%

90%

DEVICE

UNDER

TEST

_______________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 MAX3185 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 MAX3185 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.

10%

tr = 0.7ns to 1ns

30ns

t

60ns

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

_______________________________________________________________________________________ 5

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