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DM74LS952 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DM74LS952
Description  Dual Rank 8-Bit TRI-STATE®Shift Register
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM74LS952 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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TLF6437
August 1991
DM74LS952 (DM86LS52)
Dual Rank 8-Bit TRI-STATE
Shift Register
General Description
These circuits are TRI-STATE edge-triggered 8-bit IO reg-
isters in parallel with 8-bit serial shift registers which are
capable of operating in any of the following modes parallel
load from IO pins to register ‘‘A’’ parallel transfer down
from register ‘‘A’’ to serial shift register ‘‘B’’ parallel transfer
up from shift register ‘‘B’’ to register ‘‘A’’ serial shift of regis-
ter ‘‘B’’ synchronously clear Since the registers are edge-
triggered by the positive transition of the clock the control
lines which determine the mode or operation are completely
independent of the logic level applied to the clock De-
signed for bus-oriented systems these circuits have their
TRI-STATE inputs and outputs on the same pins
Features
Y
Registers are edge-triggered by the positive transition
of the clock
Y
All inputs are PNP transistors
Y
Input disable dominates over output disable
Y
Output high impedance state does not impede any oth-
er mode of operation
Y
8-bit IO pins are TRI-STATE buffers
Y
Typical shift frequency is 36 MHz
Y
Typical power dissipation is 305 mW
Y
All control inputs are active when in an ‘‘L’’ logic state
Y
Devices can be cascaded into N-bit word
Connection Diagram
Dual-In-Line Package
TLF6437 – 1
Top View
Order Number DM74LS952N or DM86LS52N
See NS Package Number N18A
Pin Description
DISO Output disable
IS Serial input
DISI Input disable
DISTU Transfer up disable
DISTD Transfer down disable
DISS Shift disable
OS Serial output
CLKClock
GNDGround
IO 1
IO 88-bit IO pins
VCC Supply Voltage
TRI-STATE
is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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