SY100HA643 Datasheet, PDF (1/4 Pages) Micrel Semiconductor – DUAL SUPPLY OCTAL ECL-TO-TTL

DUAL SUPPLY
OCTAL ECL-TO-TTL
ClockWorks™
SY100HA643
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 VBB output
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
BLOCK DIAGRAM
Q0
Q1
Q2
D
D
VBB
LEN
EN
D
Q
Q3
TTL OUTPUTS
Q4
Q5
Q6
Q7
DESCRIPTION
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.
PIN CONFIGURATION
Q3
OGND2
Q2
OVT1
Q1
OGND1
Q0
25 24 23 22 21 20 19
26
18
27
17
28
16
SY100HA643
1
TOP VIEW
15
2
PLCC
14
3
13
4
12
5 6 7 8 9 10 11
IVT2
IGND2
VCCE
VCCE
LEN
VBB
D
PIN NAMES
Pin
OGND
OVTTTL
IGND
IVT
VEE
VCCE
D, D
VBB
Q0 - Q7
EN
LEN
1
Function
TTL Output Ground (0V)
Output VCC (+5.0V)
Internal TTL GND (0V)
Internal TTL VCC (+5.0V)
ECL VEE (-5.2/-4.5V)
ECL Ground (0V)
Signal Input (ECL)
VBB Reference Output
Signal Outputs (TTL)
Enable Input (ECL)
Latch Enable Input (ECL)
Rev.: G Amendment: /1
Issue Date: August, 1998