Micrel, Inc.

SY55859L

January 2010

3

M9999-012110-A

hbwhelp@micrel.com or (408) 955-1690

Pin Description

Pin Number

Pin Name

Pin Function

1

ENB1

TTL Input. Channel B1 Output Enable. Setting this pin inactive low powers down

QB1 and /QB1. Do not leave floating.

2

DB1

CML Input. Channel B1 true input.

3

/DB1

CML Input. Channel B1 complement input.

4

ENB0

TTL Input. Channel B0 Output Enable. Setting this pin inactive low powers down

QB0 and /QB. Do not leave floating.

5

SELB0

TTL Input. Channel B0 output select. Please refer to Table 2. Do not leave

floating.

6

DB0

CML Input. Channel B0 true input.

7

/DB0

CML Input. Channel B0 complement input.

8

SELB1

TTL Input. Channel B1 output select. Please refer to Table 2. Do not leave

floating.

9, 24

GND

Supply ground. Most negative supply voltage.

10, 13, 16, 17,

20, 23

VCC

Positive Supply.

11

/QB0

CML Output. Channel B0 complement output.

12

QB0

CML Output. Channel B0 true output.

14

/QB1

CML Output. Channel B1 complement output.

15

QB1

CML Output. Channel B1 true output.

18

/QA1

CML Output. Channel A1 complement output.

19

QA1

CML Output. Channel A1 true output.

21

/QA0

CML Output. Channel A0 complement output.

22

QA0

CML Output. Channel A0 true output.

25

SELA1

TTL Input. Channel A1 output select. Please refer to Table 1. Do not leave

floating.

26

DA0

CML Input. Channel A0 true input.

27

/DA0

CML Input. Channel A0 complement input.

28

SELA0

TTL Input. Channel A0 output select. Please refer to Table 1. Do not leave

floating.

29

ENA0

TTL Input. Channel A0 output enable. Setting this pin inactive low powers down

QA0 and /QA0. Do not leave floating.

30

DA1

CML Input. Channel A1 true input.

31

/DA1

CML Input. Channel A1 complement input.

32

ENA1

TTL Input. Channel A1 output enable. Setting this pin inactive low powers down

QA1 and / QA1. Do not leave floating.

EP

Exposed Pad

Ground. This must be soldered to circuit board ground for proper electrical and

thermal operation.