SP207E Datasheet, PDF (8/16 Pages) Sipex Corporation – +5V High Performance RS232 Transceivers

ENABLE
The SP211E and SP213E all feature an enable
input, which allows the receiver outputs to be
either tri–stated or enabled. This can be especially
useful when the receiver is tied directly to a
microprocessor data bus. For the SP211E, enable
is active low; that is, 0V applied to the ENABLE
pin will enable the receiver outputs. For the
SP213E, enable is active high; that is, +5V
applied to the ENABLE pin will enable the
receiver outputs.
SP213E Only Power
SD EN SD EN Up/Down
0 01 1
Up
0 11 0
Up
1 00 1
Down
1 10 0
Down
Table 2. Wake–Up Truth Table
Receiver
Outputs
Enable
Tri–state
Enable
Tri–state
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
SP207EDS/09
SP207E Series High Performance RS232 Transceivers
8
© Copyright 2000 Sipex Corporation