54ls168dmqb National Semiconductor Corporation, 54ls168dmqb Datasheet

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54ls168dmqb

Manufacturer Part Number
54ls168dmqb
Description
54ls168 Synchronous Bi-directional Bcd Decade Counter
Manufacturer
National Semiconductor Corporation
Datasheet
C 1995 National Semiconductor Corporation
54LS168 Synchronous Bi-Directional
BCD Decade Counter
General Description
The 54LS168 is a fully synchronous 4-state up down coun-
ter featuring a preset capability for programmable operation
carry lookahead for easy cascading and a U D input to con-
trol the direction of counting It counts in the BCD (8421)
sequence and all state changes whether in counting or par-
allel loading are initiated by the LOW-to-HIGH transition of
the clock
Connection Diagram
54LS168FMQB or 54LS168LMQB
Order Number 54LS168DMQB
See NS Package Number
Dual-In-Line Package
E20A J16A or W16A
TL F 10207
Pin Names
CEP
CET
CP
P0 – P3
PE
U D
Q0 – Q3
TC
TL F 10207 – 1
Count Enable Parallel Input (Active LOW)
Count Enable Trickle Input (Active LOW)
Clock Pulse Input (Active Rising Edge)
Parallel Data Inputs
Parallel Enable Input (Active LOW)
Up-Down Count Control Input
Flip-Flop Outputs
Terminal Count Output (Active LOW)
Description
Logic Symbol
V
GND
CC
e
e
Pin 16
Pin 8
RRD-B30M105 Printed in U S A
TL F 10207 – 2
June 1989

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54ls168dmqb Summary of contents

Page 1

... It counts in the BCD (8421) sequence and all state changes whether in counting or par- allel loading are initiated by the LOW-to-HIGH transition of the clock Connection Diagram Dual-In-Line Package Order Number 54LS168DMQB 54LS168FMQB or 54LS168LMQB See NS Package Number E20A J16A or W16A Pin Names CEP ...

Page 2

Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage Operating Free Air Temperature Range 54LS Storage Temperature Range 65 ...

Page 3

Electrical Characteristics Symbol Parameter V Input Clamp Voltage I V High Level Output Voltage OH V Low Level Output Voltage OL I Input Current Max I Input Voltage I High Level Input Current IH I Low Level Input Current IL ...

Page 4

Functional Description The ’LS168 uses edge-triggered D-type flip-flops and has no constraints on changing the control or data input signals in either state of the Clock The only requirement is that the various inputs attain the desired state at least ...

Page 5

... Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS168LMQB NS Package Number E20A Order Number 54LS168DMQB NS Package Number J16A 5 ...

Page 6

Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR ...

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