9

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com

SP207E_00_072309

Figure6.Wake–UpTiming

Table2.Shut-downandWake–UpTruthTables

RECEIVER ENAbLE

SP211E and SP213E 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 shared microprocessor data

bus. For the

SP211E, enable is active low;

that is, ZeroV 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.

+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

SP2E

SD

EN#

Drivers

Receivers

0



Active

Tri-State

0

0

Active

Active





Off

Tri-State



0

Off

Tri-State

SP23E

SD#

EN

Drivers

RX -3

RX 4-5

0



Off

Tri-State

Active

0

0

Off

Tri-State

Tr-State





Active

Active

Active



0

Active

Tri-State

Tri-State