dm74ls162a National Semiconductor Corporation, dm74ls162a Datasheet - Page 4

• Manufacturer Part Number: dm74ls162a
• Description: Synchronous Presettable Bcd Decade Counters
• Manufacturer: National Semiconductor Corporation

Functional Description
The Terminal Count (TC) output is HIGH when CET is HIGH
and the counter is in its maximum count state (9 for the
decade counters 15 for the binary counters) To implement
synchronous multistage counters the TC outputs can be
used with the CEP and CET inputs in two different ways
These two schemes are shown in the 9310 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 regis-
ters In the decade counters of the ’LS160 ’LS162 the TC
output is fully decoded and can only be HIGH in state 9
LOGIC EQUATIONS
Count Enable
TC
State Diagrams
e
Q0

Q1
e

Q2
CEP


Q3
CET

CET

PE
(Continued)
’LS160 ’LS162
4
H
L
X
For the ’LS162
e
e
e
SR
H
H
H
H
L
LOW Voltage Level
HIGH Voltage Level
Immaterial
PE
H
H
H
X
L
CET
X
X
H
X
L
TL F 10177 – 5
Mode Select Table
CEP
H
X
X
X
L
Action on the Rising
RESET (Clear)
LOAD (P
COUNT (Increment)
NO CHANGE (Hold)
NO CHANGE (Hold)
Clock Edge (L )
n
x
Q
n
)