SP207 SIPEX [Sipex Corporation], SP207 Datasheet - Page 8

• Manufacturer Part Number: SP207
• Description: +5V High-Speed RS-232 Transceivers with 0.1mF Capacitors
• Manufacturer: SIPEX [Sipex Corporation]

Date:05/26/2005
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
the charge pump will discharge to V
V
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:
Table 2. Wake–Up Truth Table
Figure 5. Charge Pump — Phase 4
–
SD
0
0
1
1
output will discharge to ground. Products
• +5V must be applied to the SD pin
• ENABLE must be either 0V, +5.0V or not
• the transmitter inputs must be either +5.0V
• V
• Receiver inputs must be >0V and <+5V
connected
or not connected
CC
EN
0
1
0
1
must be +5V
SP213 Only
SD
1
1
0
0
EN
1
0
1
0
C
1
+
–
Up/Down
V
Power
Down
Down
CC
Up
Up
= +5V
CC
+
C
Receiver
Outputs
Tri–state
Tri–state
output of
2
Enable
Enable
, and the
+10V
+
+5V High-Speed RS232 Transceivers
–
8
+
–
C
C
4
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.
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
SP211B have all receivers active during shut-
down. With only the receivers active during
shutdown, the devices draw 5–10µA of supply
current.
3
+
–
SP213:
V
V
• 0V must be applied to the SD pin
• ENABLE must be either 0V, +5.0V or not
• the transmitter inputs must be either +5.0V
• V
• Receiver inputs must be >0V and <+5V
DD
SS
connected
or not connected
Storage Capacitor
Storage Capacitor
CC
must be +5V
4
and R
5
), while the SP207B and
© Copyright 2005 Sipex Corporation