DATA SHEET
Product specification
File under Integrated Circuits, IC06
December 1990
INTEGRATED CIRCUITS
74HC/HCT160
Presettable synchronous BCD
decade counter; asynchronous
reset
For a complete data sheet, please also download:
The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
December 1990
2
Philips Semiconductors
Product specification
Presettable synchronous BCD decade
counter; asynchronous reset
74HC/HCT160
FEATURES
Synchronous counting and loading
Two count enable inputs for n-bit cascading
Positive-edge triggered clock
Asynchronous reset
Output capability: standard
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT160 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT160 are synchronous presettable decade
counters which feature an internal look-ahead carry and
can be used for high-speed counting.
Synchronous operation is provided by having all flip-flops
clocked simultaneously on the positive-going edge of the
clock (CP).
The outputs (Q
0
to Q
3
) of the counters may be preset to a
HIGH or LOW level. A LOW level at the parallel enable
input (PE) disables the counting action and causes the
data at the data inputs (D
0
to D
3
) to be loaded into the
counter on the positive-going edge of the clock (providing
that the set-up and hold time requirements for PE are met).
Preset takes place regardless of the levels at count enable
inputs (CEP and CET).
A LOW level at the master reset input (MR) sets all four
outputs of the flip-flops (Q
0
to Q
3
) to LOW level regardless
of the levels at CP, PE, CET and CEP inputs (thus
providing an asynchronous clear function).
The look-ahead carry simplifies serial cascading of the
counters. Both count enable inputs (CEP and CET) must
be HIGH to count. The CET input is fed forward to enable
the terminal count output (TC). The TC output thus
enabled will produce a HIGH output pulse of a duration
approximately equal to a HIGH level output of Q
0
. This
pulse can be used to enable the next cascaded stage.
The maximum clock frequency for the cascaded counters
is determined by the CP to TC propagation delay and CEP
to CP set-up time, according to the following formula:
f
max
=
1
t
P max
(
)
CP to TC
(
)
+ t
SU
(CEP to CP)
---------------------------------------------------------------------------------------------------------
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
C; t
r
= t
f
= 6 ns
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL
propagation delay
CP to Q
n
CP to TC
MR to Q
n
MR to TC
CET to TC
C
L
= 15 pF;
V
CC
= 5 V
19
21
21
21
14
21
24
23
26
14
ns
ns
ns
ns
ns
t
PLH
propagation delay
CP to Q
n
CP to TC
CET to TC
19
21
14
21
20
7
ns
ns
ns
f
max
maximum clock
frequency
61
31
MHz
C
I
input capacitance
3.5
3.5
pF
C
PD
power dissipation
capacitance per
package
notes 1 and 2
39
34
pF
Notes
1. C
PD
is used to determine the
dynamic power dissipation
(P
D
in
W):
P
D
= C
PD
V
CC
2
f
i
+
(C
L
V
CC
2
f
o
)
where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
(C
L
V
CC
2
f
o
) = sum of
outputs
C
L
= output load capacitance in
pF
V
CC
= supply voltage in V
2. For HC the condition is
V
I
= GND to V
CC
For HCT the condition is
V
I
= GND to V
CC
-
1.5 V
December 1990
3
Philips Semiconductors
Product specification
Presettable synchronous BCD decade
counter; asynchronous reset
74HC/HCT160
ORDERING INFORMATION
See
"74HC/HCT/HCU/HCMOS Logic Package Information"
.
PIN DESCRIPTION
PIN NO.
SYMBOL
NAME AND FUNCTION
1
MR
asynchronous master reset (active LOW)
2
CP
clock input (LOW-to-HIGH, edge-triggered)
3, 4, 5, 6
D
0
to D
3
data inputs
7
CEP
count enable input
8
GND
ground (0 V)
9
PE
parallel enable input (active LOW)
10
CET
count enable carry input
14, 13, 12, 11
Q
0
to Q
3
flip-flop outputs
15
TC
terminal count output
16
V
CC
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
4
Philips Semiconductors
Product specification
Presettable synchronous BCD decade
counter; asynchronous reset
74HC/HCT160
FUNCTION TABLE
Notes
1. The TC output is HIGH when CET is HIGH and the counter is at terminal count (HLLH).
H = HIGH voltage level
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH CP transition
L = LOW voltage level
I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition
q = lower case letters indicate the state of the referenced output one set-up time prior to the LOW-to-HIGH CP
transition
X = don't care
= LOW-to-HIGH CP transition
OPERATING MODE
INPUTS
OUTPUTS
MR
CP
CEP
CET
PE
D
n
Q
n
TC
reset (clear)
L
X
X
X
X
X
L
L
parallel load
H
H
X
X
X
X
I
I
I
h
L
H
L
(1)
count
H
h
h
h
X
count
(1)
hold
H
X
I
X
h
X
q
n
(1)
(do nothing)
H
X
X
I
h
X
q
n
L
Fig.4 Functional diagram.
December 1990
5
Philips Semiconductors
Product specification
Presettable synchronous BCD decade
counter; asynchronous reset
74HC/HCT160
Fig.5 State diagram.
Fig.6
Typical timing sequence: reset outputs to zero;
preset to BCD seven; count to eight, nine, zero,
one, two and three; inhibit.
Fig.7 Logic diagram.
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