SP211BCASLASHTR datasheet(8/16 Pages) SIPEX

8 / 16 page

Date:05/26/2005

+5V High-Speed RS232 Transceivers

Figure 5. Charge Pump — Phase 4

VCC = +5V

+10V

VSS Storage Capacitor

VDD Storage Capacitor

–

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 10

µA, 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 10

µA

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

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 R5), while the SP207B and

SP211B have all receivers active during shut-

down. With only the receivers active during

shutdown, the devices draw 5–10

µA of supply

current.

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.

SP213 Only

Power

Receiver

Up/Down

Outputs

Enable

Tri–state

Down

Enable

Down

Tri–state

Table 2. Wake–Up Truth Table

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