REV: A DATE:12/03/2003

+5V High-Speed RS232 Transceivers

© Copyright 2000 Sipex Corporation

8

Figure 5. Charge Pump — Phase 4

+10V

+

+

++

–

–

–

–

SHUTDOWN MODE

The SP200, SP205, SP205B, 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

10

µA, making the parts ideal for battery–pow-

ered systems. In the “shutdown” mode the re-

ceivers and transmitters will both be tri–stated.

to V

ground. Products with the WakeUp function can

enable or disable the receivers during shutdown.

For complete shutdown to occur and the 10

µA

power drain to be realized, the following condi-

tions must be met:

SP200, SP205/B, 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

• 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

• Receiver inputs must be >0V and <+5V

WAKEUP FUNCTION

The SP205B, SP206B, SP207B, SP211B and

SP213 have a wake–up feature that keeps two or

more receivers in an enabled state when the

device is in the shutdown mode. The SP213 has

two receivers active (R

SP205B, SP207B and SP211B have all receiv-

ers active during shutdown. With only the re-

ceivers active during shutdown, the devices

draw 5–10

µA of supply current.

ENABLE

The SP205/B, SP206/B, SP207/B, SP211 and

SP213 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 SP205/B, 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 applied to the ENABLE pin will

enable the receiver outputs.

SP213 Only

Power

Receiver

SD

EN

SD

EN

Up/Down

Outputs

00

11

Up

Enable

01

10

Up

Tri–state

10

01

Down

Enable

11

00

Down

Tri–state

Table 2. Wake–Up Truth Table