SP230ACT datasheet(9/17 Pages) SIPEX

9 / 17 page

Date: 8/3/04

+ 5V Powered Multi-Channel RS-232 Drivers/Receivers

Figure 4. Mouse Application Drive Capability

02468

IOL/IOH (mA)

VOL vs IOL

VOH vs IOH

Figure 5. Parallel Drivers

T IN

T OUT

Wake-Up Feature

The SP235B, SP236B, SP240B and SP241B

have a wake-up feature that keeps all receivers

in an enabled state when the device is in the

shutdown mode. Table 2 defines the truth table

for the wake-up function. Timing for the wake-up

function is shown in Figure 6.

If the SP235B, SP236B, SP240B and SP241B

are powered up in the shutdown state (SD driven

high during V

CC power up), the part must remain

in a powered on state for a minimum of 3ms

before the wake-up function can be used. After

the 3ms wait time, there is a 2ms delay time

before data is valid for both enable and disable

+5V

ROUT

POWER-UP WITH SD HIGH (charge pump section in shutdown state)

+5V

ROUT

POWER-UP WITH SD LOW (charge pump section in active mode)

tWAIT

tENABLE

t0 (power up)

+5V

ROUT

EXERCISING WAKE–UP FEATURE

t0 (power up)

DATA

VALID

tWAIT

DATA

VALID

DATA

VALID

DATA

VALID

DATA

VALID

tENABLE

SPECIFICATIONS:

(VCC =+5V±10%, TA=25°C)

PARAMETER

MIN.

TYP.

MAX.

tWAIT

2ms

3ms

tENABLE

1ms

2ms

Figure 6. Wake–Up and Shutdown Timing

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