V
CC
= +5V
+10V
C
1
+
–
C
4
+
–
+
C
2
+
–
–
V
DD
Storage Capacitor
V
SS
Storage Capacitor
C
3
Figure 5. Charge Pump — Phase 4
SHUTDOWN MODE
The
SP200, SP206, SP206B, SP207B, SP211,
SP211B
and
SP213
all feature a control input
which will disable the device and reduce the
power supply current to less than 10µA, making
the parts ideal for battery–powered systems. In
the “shutdown” mode the receivers and trans-
mitters will both be tri–stated. The V
+
output of
the charge pump will discharge to V
CC
, and the
V
–
output will discharge to ground. Products
with the WakeUp function can enable or disable
the receivers during shutdown.
For complete shutdown to occur and the 10µA
power drain to be realized, the following condi-
tions must be met:
SP200, SP206/B, SP207B
and
SP211/B:
• +5V must be applied to the SD pin
• ENABLE must be either 0V, +5.0V or not
connected
• the transmitter inputs must be either +5.0V
or not connected
• V
CC
must be +5V
• Receiver inputs must be >0V and <+5V
SP213:
• 0V must be applied to the SD pin
• ENABLE must be either 0V, +5.0V or not
connected
• the transmitter inputs must be either +5.0V
or not connected
• V
CC
must be +5V
• Receiver inputs must be >0V and <+5V
ENABLE
The
SP206/B, SP207/B, SP211
and
SP213
all
feature an enable input, which allows the re-
ceiver 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
SP206/B, SP207/B
and
SP211,
enable is
active low; that is, 0V applied to the ENABLE
pin will enable the receiver outputs. For the
SP213,
enable is active high; that is, +5V ap-
plied to the ENABLE pin will enable the re-
ceiver outputs.
SD
0
0
1
1
EN
0
1
0
1
SP213 Only
SD
EN
1
1
1
0
0
0
1
0
Power
Up/Down
Up
Up
Down
Down
Receiver
Outputs
Enable
Tri–state
Enable
Tri–state
Table 2. Wake–Up Truth Table
WAKEUP FUNCTION
The
SP206B, SP207B, SP211B
and
SP213
have
a wake–up feature that keeps two or more re-
ceivers in an enabled state when the device is in
the shutdown mode. The
SP213
has two receiv-
ers active (R
4
and R
5
), while the
SP207B
and
SP211B
have all receivers active during shut-
down. With only the receivers active during
shutdown, the devices draw 5–10µA of supply
current.
Date:05/26/2005
+5V High-Speed RS232 Transceivers
© Copyright 2005 Sipex Corporation
8
SIPEX [ SIPEX CORPORATION ]
