SP200 Ver la hoja de datos (PDF) - Signal Processing Technologies

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SP200

+5V High-Speed RS-232 Transceivers with 0.1uF Capacitors

Signal Processing Technologies 

A typical application of this function would be

where a modem is interfaced to a computer in a

power–down mode. The ring indicator signal

from the modem could be passed through an

active receiver in the SP2XXB/SP213 that is

itself in the shutdown mode. The ring indicator

signal would propagate through the SP2XXB/

SP213 to the power management circuitry of the

computer to power up the microprocessor and

the SP2XXB/SP213 drivers. After the supply

voltage to the SP2XXB/SP213 reaches +5.0V,

the SHUTDOWN pin can be disabled, taking

the SP2XXB/SP213 out of the shutdown mode.

All receivers that are active during shutdown

maintain 500mV (typ.) of hysteresis.

POWER UP WITH SD ACTIVE (Charge pump in shutdown mode)

t0 (POWERUP)

+5V

ROUT

0V

ENABLE

SD

DISABLE

tWAIT

DATA VALID

POWER UP WITH SD DISABLED (Charge pump in active mode)

t0 (POWERUP)

+5V

ROUT

0V

ENABLE

SD

DATA VALID

tENABLE

DISABLE

EXERCISING WAKE–UP FEATURE

t0 (POWERUP)

+5V

ROUT

0V

DATA VALID

DATA VALID

tENABLE

tENABLE

DATA VALID

tENABLE

SD

DISABLE

ENABLE

tWAIT

VCC = +5V ±10%; TA = 25°C

tWAIT = 2ms typical, 3ms maximum

tENABLE = 1ms typical, 2ms maximum

DISABLE

Figure 6. Wake–Up Timing

Date:03/04/2005

+5V High-Speed RS232 Transceivers

9

© Copyright 2005 Sipex Corporation

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