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100344F Datasheet

  • 100344F

  • Low Power 8-Bit Latch with Cut-Off Drivers

  • 174.59KB

  • 8頁

  • NSC

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100344 Low Power 8-Bit Latch with Cut-Off Drivers
August 1998
100344
Low Power 8-Bit Latch with Cut-Off Drivers
General Description
The 100344 contains eight D-type latches, individual inputs
(D
n
), outputs (Q
n
), a common enable pin (E), latch enable
(LE), and output enable pin (OEN). A Q output follows its D
input when both E and LE are LOW. When either E or LE (or
both) are HIGH, a latch stores the last valid data present on
its D input prior to E or LE going HIGH.
A HIGH on OEN holds the outputs in a cut-off state. The
cut-off state is designed to be more negative than a normal
ECL LOW level. This allows the output emitter-followers to
turn off when the termination supply is 鈭?.0V, presenting a
high impedance to the data bus. This high impedance re-
duces termination power and prevents loss of low state
noise margin when several loads share the bus.
The 100344 outputs are designed to drive a doubly termi-
nated 50鈩?transmission line (25鈩?load impedance). All in-
puts have 50 k鈩?pull-down resistors.
Features
n
n
n
n
n
n
Cut-off drivers
Drives 25鈩?load
Low power operation
2000V ESD protection
Voltage compensated operating range = 鈭?.2V to 鈭?.7V
Available to MIL-STD-883
Logic Symbol
E
Pin Names
D
0
鈥揇
7
LE
OEN
Q
0
鈥換
7
DS100317-4
Description
Data Inputs
Enable Input
Latch Enable Input
Output Enable Input
Data Outputs
Connection Diagrams
24-Pin DIP
24-Pin Quad Cerpak
DS100317-2
DS100317-1
漏 1998 National Semiconductor Corporation
DS100317
www.national.com

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