54ac191 National Semiconductor Corporation, 54ac191 Datasheet

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54ac191

Manufacturer Part Number
54ac191
Description
Up/down Counter With Preset And Ripple Clock
Manufacturer
National Semiconductor Corporation
Datasheet

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© 1998 National Semiconductor Corporation
54AC191
Up/Down Counter with Preset and Ripple Clock
General Description
The ’AC191 is a reversible modulo 16 binary counter. It fea-
tures synchronous counting and asynchronous presetting.
The preset feature allows the ’AC191 to be used in program-
mable dividers. The Count Enable input, the Terminal Count
output and the Ripple Clock output make possible a variety
of methods of implementing multistage counters. In the
counting modes, state changes are initiated by the rising
edge of the clock.
Logic Symbols
FACT
CE
CP
P
PL
U/D
Q
RC
TC
0
0
–P
Pin Names
–Q
3
is a trademark of Fairchild Semiconductor Corporation.
3
Count Enable Input
Clock Pulse Input
Parallel Data Inputs
Asynchronous Parallel Load Input
Up/Down Count Control Input
Flip-Flop Outputs
Ripple Clock Output
Terminal Count Output
IEEE/IEC
Description
DS100279
DS100279-1
DS100279-2
Features
n I
n High speed — 133 MHz typical count frequency
n Synchronous counting
n Asynchronous parallel load
n Cascadable
n Outputs source/sink 24 mA
n Standard Military Drawing (SMD)
Connection Diagrams
— ’AC191: 5962-89749
CC
reduced by 50%
Pin Assignment for LCC
for DIP and Flatpack
Pin Assignment
DS100279-3
DS100279-4
www.national.com
July 1998

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54ac191 Summary of contents

Page 1

... Up/Down Counter with Preset and Ripple Clock General Description The ’AC191 is a reversible modulo 16 binary counter. It fea- tures synchronous counting and asynchronous presetting. The preset feature allows the ’AC191 to be used in program- mable dividers. The Count Enable input, the Terminal Count output and the Ripple Clock output make possible a variety of methods of implementing multistage counters ...

Page 2

Functional Description The ’AC191 is a synchronous up/down counter. The ’AC191 is organized as a 4-bit binary counter. It contains four edge-triggered flip-flops with internal gating and steering logic to provide individual preset, count-up and count-down operations. Each circuit has ...

Page 3

Functional Description (Continued) FIGURE 1. N-Stage Counter Using Ripple Clock FIGURE 2. Synchronous N-Stage Counter Using Ripple Carry/Borrow FIGURE 3. Synchronous N-Stage Counter with Parallel Gated Carry/Borrow DS100279-7 DS100279-8 3 DS100279-9 www.national.com ...

Page 4

State Diagram Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.national.com DS100279-5 4 DS100279-6 ...

Page 5

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 Diode Current ( −0. ...

Page 6

DC Characteristics for ’AC Family Devices Note 2: All outputs loaded; thresholds on input associated with output under test. Note 3: Maximum test duration 2.0 ms, one output loaded at a time. Note 4: I and I @ 3.0V are ...

Page 7

AC Operating Requirements Symbol Parameter t Setup Time, HIGH or LOW Hold Time, HIGH or LOW Setup Time, LOW Hold Time, LOW h ...

Page 8

8 ...

Page 9

Physical Dimensions inches (millimeters) unless otherwise noted 20 Terminal Ceramic Leadless Chip Carrier (L) 16 Lead Ceramic Dual-In-Line Package (D) NS Package Number E20A NS Package Number J16A 9 www.national.com ...

Page 10

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR ...

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