SP207E datasheet(8/16 Pages) SIPEX

8 / 16 page

SP207EDS/09

SP207E Series High Performance RS232 Transceivers

Figure 6. Wake–Up Timing

+5V

ENABLE

DISABLE

ROUT

DATA VALID

+5V

ROUT

+5V

ROUT

tWAIT

t0 (POWERUP)

ENABLE

DISABLE

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

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

t0 (POWERUP)

tENABLE

DATA VALID

EXERCISING WAKE–UP FEATURE

t0 (POWERUP)

tENABLE

tWAIT

DISABLE

ENABLE

tWAIT = 2ms typical, 3ms maximum

tENABLE = 1ms typical, 2ms maximum

VCC = +5V ±10%; TA = 25°C

SP213E Only

Power

Receiver

Up/Down

Outputs

Enable

Tri–state

Down

Enable

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.

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