MAX3224 Просмотр технического описания (PDF) - Maxim Integrated

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MAX3224

1µA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus

Maxim Integrated 

1µA Supply Current, 1Mbps, 3.0V to 5.5V,

RS-232 Transceivers with AutoShutdown Plus

RECEIVER

INPUTS

} INVALID

REGION

TRANSMITTER

INPUTS

TRANSMITTER

OUTPUTS

INVALID

OUTPUT

VCC

tINVL

0

tINVH

tAUTOSHDN

tAUTOSHDN

tWU

tWU

*VCC

OUTPUT 0

V+

VCC

0

V-

*MAX3224–MAX3227

Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram

By connecting FORCEON to INVALID, the MAX3224–

MAX3227/MAX3244/MAX3245 shut down when no valid

receiver level and no receiver or transmitter edge is

detected for 30sec, and wake up when a valid receiver

level or receiver or transmitter edge is detected.

By connecting FORCEON and FORCEOFF to INVALID,

the MAX3224–MAX3227/MAX3244/MAX3245 shutdown

when no valid receiver level is detected and wake up

when a valid receiver level is detected (same function-

ality as AutoShutdown feature on MAX3221/MAX3223/

MAX3243).

A mouse or other system with AutoShutdown Plus may

need time to wake up. Figure 5 shows a circuit that

forces the transmitters on for 100ms, allowing enough

time for the other system to realize that the MAX3244/

MAX3245 is awake. If the other system outputs valid

RS-232 signal transitions within that time, the RS-232

ports on both systems remain enabled.

POWER-

MANAGEMENT

UNIT

MASTER SHDN LINE

0.1μF 1MΩ

FORCEOFF FORCEON

MAX3224

MAX3225

MAX3226

MAX3227

MAX3244

MAX3245

Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a

Mouse or Another System

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