9

Date: 8/3/04

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

© Copyright 2004 Sipex Corporation

Figure 4. Mouse Application Drive Capability

10

9

8

7

6

5

4

3

2

1

0

02468

10

12

18

20

16

14

22

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

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

0V

+5V

0V

SD

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

+5V

0V

+5V

0V

SD

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

+5V

0V

+5V

0V

SD

EXERCISING WAKE–UP FEATURE

DATA

VALID

DATA

VALID

DATA

VALID

DATA

VALID

DATA

VALID

SPECIFICATIONS:

PARAMETER

MIN.

TYP.

MAX.

2ms

3ms

1ms

2ms

Figure 6. Wake–Up and Shutdown Timing