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DS75325N Datasheet

  • DS75325N

  • Memory Drivers

  • 14頁

  • NSC

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DS75325 Memory Drivers
June 1992
DS75325
Memory Drivers
General Description
The DS75325 is a monolithic memory driver which features
high current outputs as well as internal decoding of logic
inputs This circuit is designed for use with magnetic memo-
ries
The circuit contains two 600 mA sink-switch pairs and two
600 mA source-switch pairs Inputs A and B determine
source selection while the source strobe (S1) allows the
selected source turn on In the same manner inputs C and
D determine sink selection while the sink strobe (S2) allows
the selected sink turn on
Sink-output collectors feature an internal pull-up resistor in
parallel with a clamping diode connected to V
CC2
This pro-
tects the outputs from voltage surges associated with
switching inductive loads
The source stage features Node R which allows extreme
flexibility in source current selection by controlling the
amount of base drive to each source transistor This method
of setting the base drive brings the power associated with
the resistor outside the package thereby allowing the circuit
to operate at higher source currents for a given junction
temperature If this method of source current setting is not
desired then Nodes R and R
INT
can be shorted externally
activating an internal resistor connected from V
CC2
to Node
R This provides adequate base drive for source currents up
to 375 mA with V
CC2
e
15V or 600 mA with V
CC2
e
24V
Features
Y
Y
Y
Y
Y
Y
Y
600 mA output capability
24V output capability
Dual sink and dual source outputs
Fast switching times
Source base drive externally adjustable
Input clamping diodes
TTL compatible
Connection Diagram
Dual-In-Line Package
Truth Table
Address Inputs
Source
Sink
A
B C D
L
H X X
H
L
X X
X
X
L H
X
X H L
X
X X X
H
H H H
Strobe Inputs
Source Sink
S1
S2
L
H
L
H
H
L
H
L
H
H
X
X
Outputs
Source
Sink
W
X
Y
Z
ON OFF OFF OFF
OFF ON OFF OFF
OFF OFF ON OFF
OFF OFF OFF ON
OFF OFF OFF OFF
OFF OFF OFF OFF
H
e
High Level L
e
Low Level X
e
Irrelevant
Note
Not more than one output is to be on at any one time
TL F 9755 鈥?2
Top View
Order Number DS75325N
See NS Package Number N14A
C
1995 National Semiconductor Corporation
TL F 9755
RRD-B30M115 Printed in U S A

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