SP207EDS/09

SP207E Series High Performance RS232 Transceivers

© Copyright 2000 Sipex Corporation

8

Figure 6. Wake–Up Timing

+5V

0V

ENABLE

DISABLE

SD

DATA VALID

+5V

0V

+5V

0V

ENABLE

DISABLE

SD

POWER UP WITH SD ACTIVE (Charge pump in shutdown mode)

POWER UP WITH SD DISABLED (Charge pump in active mode)

DATA VALID

SD

DATA VALID

DATA VALID

DATA VALID

EXERCISING WAKE–UP FEATURE

DISABLE

DISABLE

ENABLE

SP213E Only

Power

Receiver

SD

EN

SD

EN

Up/Down

Outputs

0

0

1

1

Up

Enable

0

1

1

0

Up

Tri–state

1

0

0

1

Down

Enable

1

1

0

0

Down

Tri–state

Table 2. Wake–Up Truth Table

ENABLE

The SP211E and SP213E 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 SP211E, enable

is active low; that is, 0V applied to the ENABLE

pin will enable the receiver outputs. For the

SP213E, enable is active high; that is, +5V

applied to the ENABLE pin will enable the

receiver outputs.