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Precision Edge
®
SY100HA643Micrel, Inc.
M9999-032906
hbwhelp@micrel.com or (408) 955-1690
The SY100HA643 is an enhanced dual supply, low skew
translating 1:8 clock driver. Devices in the Micrel 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
■ ECL/TTL version of popular ECLinPS™ E111
■ 400ps within device skew
■ 800ps part-to-part skew
■ Latch
■ Differential internal design
■ V
BB output
■ Dual supply
■ Reset/Enable
■ Multiple TTL and ECL power/ground pins
■ Fully compatible with MC100H643
■ Higher performance than H643 versions
■ Industrial temperature availability
■ Available in 28-pin PLCC package
DUAL SUPPLY
OCTAL ECL-TO-TTL
Rev.: H Amendment: /0
Issue Date: March 2006
Precision Edge
®
SY100HA643
BLOCK DIAGRAM
Pin Function
OGND TTL Output Ground (0V)
OVTTTL Output VCC (+5.0V)
IGND Internal TTL GND (0V)
IVT Internal TTL VCC (+5.0V)
VEE ECL VEE (-5.2/-4.5V)
VCCE ECL Ground (0V)
D, D Signal Input (ECL)
VBB VBB Reference Output
Q0 - Q7 Signal Outputs (TTL)
EN Enable Input (ECL)
LEN Latch Enable Input (ECL)
PIN NAMES
D
V
BB
Q
0
Q
1
Q
2
Q
3
Q
4
Q
5
Q
6
Q
7
D
LEN
EN
D
Q
TTL OUTPUTS
Precision Edge is a registered trademark of Micrel, Inc.
Precision Edge
®
NOT RECOMMENDED FOR NEW DESIGNS
