SP200 Datasheet, PDF (9/15 Pages) Sipex Corporation – +5V High-Speed RS-232 Transceivers with 0.1uF Capacitors

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)
t_{0 (POWERUP)}
+5V
R_OUT
0V
ENABLE
SD
DISABLE
t_WAIT
DATA VALID
POWER UP WITH SD DISABLED (Charge pump in active mode)
t_{0 (POWERUP)}
+5V
R_OUT
0V
ENABLE
SD
DATA VALID
t_ENABLE
DISABLE
EXERCISING WAKE–UP FEATURE
t_{0 (POWERUP)}
+5V
R_OUT
0V
DATA VALID
DATA VALID
t_ENABLE
t_ENABLE
DATA VALID
t_ENABLE
SD
DISABLE
ENABLE
t_WAIT
V_CC = +5V ±10%; T_A = 25°C
t_WAIT = 2ms typical, 3ms maximum
t_ENABLE = 1ms typical, 2ms maximum
DISABLE
Figure 6. Wake–Up Timing
REV: A DATE:12/03/2003
+5V High-Speed RS232 Transceivers
9
© Copyright 2000 Sipex Corporation