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54F163ALM Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # 54F163ALM
Description  Synchronous Presettable Binary Counter
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

54F163ALM Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Functional Description
The ’F161A and ’F163A count in modulo-16 binary se-
quence From state 15 (HHHH) they increment to state 0
(LLLL) The clock inputs of all flip-flops are driven in parallel
through a clock buffer Thus all changes of the Q outputs
(except due to Master Reset of the ’F161A) occur as a re-
sult of and synchronous with the LOW-to-HIGH transition
of the CP input signal The circuits have four fundamental
modes of operation in order of precedence asynchronous
reset (’F161A) synchronous reset (’F163A) parallel load
count-up and hold Five control inputsMaster Reset (MR
’F161A) Synchronous Reset (SR ’F163A) Parallel Enable
(PE) Count Enable Parallel (CEP) and Count Enable Trickle
(CET)determine the mode of operation as shown in the
Mode Select Table A LOW signal on MR overrides all other
inputs and asynchronously forces all outputs LOW A LOW
signal on SR overrides counting and parallel loading and
allows all outputs to go LOW on the next rising edge of CP
A LOW signal on PE overrides counting and allows informa-
tion on the Parallel Data (Pn) inputs to be loaded into the
flip-flops on the next rising edge of CP With PE and MR
(’F161A) or SR (’F163A) HIGH CEP and CET permit count-
ing when both are HIGH Conversely a LOW signal on ei-
ther CEP or CET inhibits counting
The ’F161A and ’F163A use D-type edge triggered flip-flops
and changing the SR PE CEP and CET inputs when the CP
is in either state does not cause errors provided that the
recommended setup and hold times with respect to the ris-
ing edge of CP are observed
The Terminal Count (TC) output is HIGH when CET is HIGH
and the counter is in state 15 To implement synchronous
multi-stage counters the TC outputs can be used with the
CEP and CET inputs in two different ways Please refer to
the ’F568 data sheet The TC output is subject to decoding
spikes due to internal race conditions and is therefore not
recommended for use as a clock or asynchronous reset for
flip-flops counters or registers
Logic Equations Count Enable e CEP
 CET  PE
TC e Q0  Q1  Q2  Q3  CET
Mode Select Table
SR
PE
CET
CEP
Action on the Rising
Clock Edge (
L)
L
X
X
X
Reset (Clear)
H
L
X
X
Load (Pn
xQn)
H
H
H
H
Count (Increment)
H
H
L
X
No Change (Hold)
H
H
X
L
No Change (Hold)
For ’F163A only
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
State Diagram
TLF9486 – 5
3


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