MAX3387 Просмотр технического описания (PDF) - Maxim Integrated

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MAX3387

3V, ±15kV ESD-Protected, AutoShutdown Plus RS-232 Transceiver for PDAs and Cell Phones

Maxim Integrated 

3V, ±15kV ESD-Protected, AutoShutdown Plus

RS-232 Transceiver for PDAs and Cell Phones

RECEIVER

INPUTS

TRANSMITTER

INPUTS

TRANSMITTER

OUTPUTS

INVALID

OUTPUT

VCC

tINVL

0

tINVH

tAUTOSHDN

tAUTOSHDN

tWU

} INVALID

REGION

tWU

V+

VCC

0

V-

Figure 3b. AutoShutdown Plus/INVALID Timing Diagram

POWER-

MASTER SHDN LINE

MANAGEMENT

UNIT

0.1μF

1M

FORCEOFF FORCEON

MAX3387E

Figure 4. AutoShutdown with Initial Turn-On to Wake Up a

System

Software-Controlled Shutdown

If direct software control is desired, INVALID can be

used to indicate a DTR or ring indicator signal. Connect

FORCEOFF and FORCEON together to bypass

AutoShutdown so the line acts like a SHDN input.

±15kV ESD Protection

As with all Maxim devices, ESD-protection structures

are incorporated on all pins to protect against electro-

static discharges (ESDs) encountered during handling

and assembly. The MAX3387E driver outputs and

receiver inputs have extra protection against static

electricity. Maxim has developed state-of-the-art struc-

tures to protect these pins against ESD of ±15kV with-

out damage. The ESD structures withstand high ESD in

all states: normal operation, shutdown, and powered

down. After an ESD event, Maxim’s “E” version devices

keep working without latchup, whereas competing RS-

232 products can latch and must be powered down to

remove latchup. ESD protection can be tested in vari-

ous ways. The transmitter outputs and receiver inputs

of this product family are characterized for protection to

the following limits:

1) ±15kV using the Human Body Model

2) ±8kV using the Contact-Discharge method specified

in IEC 1000-4-2

3) ±15kV using IEC 1000-4-2’s Air-Gap method

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