dm54ls169a National Semiconductor Corporation, dm54ls169a Datasheet

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dm54ls169a

Manufacturer Part Number
dm54ls169a
Description
Synchronous 4-bit Up/down Binary Counter
Manufacturer
National Semiconductor Corporation
Datasheet
C 1995 National Semiconductor Corporation
54LS169 DM54LS169A DM74LS169A
Synchronous 4-Bit Up Down Binary Counter
General Description
This synchronous presettable counter features an internal
carry look-ahead for cascading in high-speed counting ap-
plications Synchronous operation is provided by having all
flip-flops clocked simultaneously so that the outputs all
change at the same time when so instructed by the count-
enable inputs and internal gating This mode of operation
helps eliminate the output counting spikes that are normally
associated with asynchronous (ripple clock) counters A
buffered clock input triggers the four master-slave flip-flops
on the rising edge of the clock waveform
This counter is fully programmable that is the outputs may
each be preset either high or low The load input circuitry
allows loading with the carry-enable output of cascaded
counters As loading is synchronous setting up a low level
at the load input disables the counter and causes the out-
puts to agree with the data inputs after the next clock pulse
The carry look-ahead circuitry permits cascading counters
for n-bit synchronous applications without additional gating
Both count-enable inputs (P and T) must be low to count
The direction of the count is determined by the level of the
up down input When the input is high the counter counts
up when low it counts down Input T is fed forward to en-
able the carry outputs The carry output thus enabled will
produce a low-level output pulse with a duration approxi-
mately equal to the high portion of the Q
Connection Diagram
DM54LS169AJ DM54LS169AW DM74LS169AM or DM74LS169AN
Order Number 54LS169DMQB 54LS169FMQB 54LS169LMQB
TL F 6401
See NS Package Number E20A J16A M16A N16E or W16A
A
output when
Dual-In-Line Package
counting up and approximately equal to the low portion of
the Q
carry pulse can be used to enable successively cascaded
stages Transitions at the enable P or T inputs are allowed
regardless of the level of the clock input All inputs are diode
clamped to minimize transmission-line effects thereby sim-
plifying system design
This counter features a fully independent clock circuit
Changes at control inputs (enable P enable T load up
down) which modify the operating mode have no effect
until clocking occurs The function of the counter (whether
enabled disabled loading or counting) will be dictated
solely by the conditions meeting the stable setup and hold
times
Features
Y
Y
Y
Y
Y
Fully
programming
Internal look-ahead for fast counting
Carry output for n-bit cascading
Fully independent clock circuit
Alternate
available
Office Distributor for specifications
A
output when counting down This low-level overflow
synchronous
Contact a National Semiconductor Sales
Military Aerospace
operation
TL F 6401 – 1
device
for
RRD-B30M105 Printed in U S A
counting
(54LS169)
June 1989
and
is

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dm54ls169a Summary of contents

Page 1

... Q Connection Diagram Order Number 54LS169DMQB 54LS169FMQB 54LS169LMQB DM54LS169AJ DM54LS169AW DM74LS169AM or DM74LS169AN See NS Package Number E20A J16A M16A N16E or W16A C 1995 National Semiconductor Corporation TL F 6401 counting up and approximately equal to the low portion of ...

Page 2

... The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation 125 150 C a DM54LS169A Min Nom Max ...

Page 3

Switching Characteristics Symbol Parameter f Maximum Clock MAX Frequency t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PHL High to Low Level Output t Propagation Delay Time PLH Low to High Level Output t ...

Page 4

Logic Diagram LS169A Binary Counter 6401 – 2 ...

Page 5

Timing Diagram Typical Load Count and Inhibit Sequences LS169A Binary Counters 6401 – 3 ...

Page 6

... Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS169DMQB or DM54LS169AJ Order Number 54LS169LMQB NS Package Number E20A NS Package Number J16A 6 ...

Page 7

Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS169AM NS Package Number M16A Order Number DM74LS169AN NS Package Number N16E 7 ...

Page 8

... Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54LS169FMQB or DM54LS169AW 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 CORPORATION As used herein ...

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