The SY100HA643 is an enhanced dual supply, low skew

translating 1:8 clock driver. Devices in the Micrel-Synergy

H600 translators series utilize the 28-lead PLCC for optimal

power pinning, signal flow through and electrical

performance. The dual-supply HA643 is similar to the H641,

which is a single-supply 1:9 version of the same function,

with higher performance than the H643 versions.

The device features a 48mA TTL output stage, with AC

performance specified into a 20pF load capacitance.

A

Latch is provided on-chip. When LEN is LOW (or left open,

in which case it is pulled LOW by the internal pulldowns)

the latch is transparent. A HIGH on the enable pin (EN)

forces all outputs LOW.

The 100HA643 is compatible with 100K ECL logic levels.

DESCRIPTION

FEATURES

s ECL/TTL version of popular ECLinPS™ E111

s 400ps within device skew

s 800ps part-to-part skew

s Latch

s Differential internal design

s Dual supply

s Reset/Enable

s Multiple TTL and ECL power/ground pins

s Fully compatible with Motorola MC100H643

s Higher performance than H643 versions

s Industrial temperature availability

s Available in 28-pin PLCC package

DUAL SUPPLY

OCTAL ECL-TO-TTL

Rev.: G

Amendment: /1

Issue Date: August, 1998

ClockWorks™

SY100HA643

BLOCK DIAGRAM

PIN CONFIGURATION

Pin

Function

OGND

TTL Output Ground (0V)

OVTTTL

IGND

Internal TTL GND (0V)

IVT

ECL Ground (0V)

D, D

Signal Input (ECL)

Q0 - Q7

Signal Outputs (TTL)

EN

Enable Input (ECL)

LEN

Latch Enable Input (ECL)

PIN NAMES

D

D

LEN

EN

D

Q

TTL OUTPUTS

18

17

16

15

14

13

12

5

6789

10 11

SY100HA643

TOP VIEW

PLCC

LEN

D

4

3

2

1

28

27

26

25 24

23 22 21 20 19

1