74LS160 Datasheet PDF
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BCD DECADE COUNTERS/
4-BIT BINARY COUNTERS
The LS160A / 161A / 162A / 163A are high-speed 4-bit synchronous count-
ers. They are edge-triggered, synchronously presettable, and cascadable
MSI building blocks for counting, memory addressing, frequency division and
other applications. The LS160A and LS162A count modulo 10 (BCD). The
LS161A and LS163A count modulo 16 (binary.)
The LS160A and LS161A have an asynchronous Master Reset (Clear)
input that overrides, and is independent of, the clock and all other control
inputs. The LS162A and LS163A have a Synchronous Reset (Clear) input that
overrides all other control inputs, but is active only during the rising clock
edge.
BCD (Modulo 10)
Binary (Modulo 16)
Asynchronous Reset
LS160A
LS161A
Synchronous Reset
LS162A
LS163A
Synchronous Counting and Loading
Two Count Enable Inputs for High Speed Synchronous Expansion
Terminal Count Fully Decoded
Edge-Triggered Operation
Typical Count Rate of 35 MHz
ESD > 3500 Volts
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC TC Q0 Q1 Q2 Q3 CET PE
16 15 14 13 12 11 10 9
1 2 3 4 56 78
*R CP P0 P1 P2 P3 CEP GND
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
*MR for LS160A and LS161A
*SR for LS162A and LS163A
PIN NAMES
PE
P0 – P3
CEP
CET
CP
MR
SR
Q0 – Q3
TC
Parallel Enable (Active LOW) Input
Parallel Inputs
Count Enable Parallel Input
Count Enable Trickle Input
Clock (Active HIGH Going Edge) Input
Master Reset (Active LOW) Input
Synchronous Reset (Active LOW) Input
Parallel Outputs (Note b)
Terminal Count Output (Note b)
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and
Temperature Ranges.
LOADING (Note a)
HIGH
LOW
1.0 U.L.
0.5 U.L.
0.5 U.L.
1.0 U.L.
0.5 U.L.
0.5 U.L.
1.0 U.L.
10 U.L.
10 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
0.5 U.L.
5 (2.5) U.L.
5 (2.5) U.L.
5 U.L. for Commercial (74)
74LS160
74LS161
74LS162
74LS163
BCD DECADE COUNTERS /
4-BIT BINARY COUNTERS
LOW POWER SCHOTTKY
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
LOGIC SYMBOL
934 56
7
PE P0 P1 P2 P3
CEP
10 CET
TC 15
2 CP
*R Q0 Q1 Q2 Q3
1 14 13 12 11
VCC = PIN 16
GND = PIN 8
*MR for LS160A and LS161A
*SR for LS162A and LS163A
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SN54/74LS160A SN54/74LS161A
SN54/74LS162A SN54/74LS163A
STATE DIAGRAM
LS160A LS162A
0123
15
14
13
12 11 10 9
4
5
6
7
8
LS161A LS163A
0123
15
14
13
12 11 10 9
4
5
6
7
8
LOGIC EQUATIONS
Count Enable = CEP CET PE
TC for LS160A & LS162A = CET Q0 Q1 Q2 Q3
TC for LS161A & LS163A = CET Q0 Q1 Q2 Q3
Preset = PE CP + (rising clock edge)
Reset = MR (LS160A & LS161A)
Reset = SR CP + (rising clock edge)
Reset = (LS162A & LS163A)
NOTE:
The LS160A and LS162A can be preset to any state,
but will not count beyond 9. If preset to state 10, 11,
12, 13, 14, or 15, it will return to its normal sequence
within two clock pulses.
FUNCTIONAL DESCRIPTION
The LS160A / 161A / 162A / 163A are 4-bit synchronous
counters with a synchronous Parallel Enable (Load) feature.
The counters consist of four edge-triggered D flip-flops with
the appropriate data routing networks feeding the D inputs. All
changes of the Q outputs (except due to the asynchronous
Master Reset in the LS160A and LS161A) occur as a result of,
and synchronous with, the LOW to HIGH transition of the
Clock input (CP). As long as the set-up time requirements are
met, there are no special timing or activity constraints on any
of the mode control or data inputs.
Three control inputs — Parallel Enable (PE), Count Enable
Parallel (CEP) and Count Enable Trickle (CET) — select the
mode of operation as shown in the tables below . The Count
Mode is enabled when the CE,PCET, and PE inputs are HIGH.
When the PE is LOW, the counters will synchronously load the
data from the parallel inputs into the flip-flops on the LOW to
HIGH transition of the clock. Either the CEP or CET can be
used to inhibit the count sequence. With the PE held HIGH, a
LOW on either the CEP or CET inputs at least one set-up time
prior to the LOW to HIGH clock transition will cause the
existing output states to be retained. The AND feature of the
two Count Enable inputs (CET CEP) allows synchronous
cascading without external gating and without delay accu-
mulation over any practical number of bits or digits.
The Terminal Count (TC) output is HIGH when the Count
Enable Trickle (CET) input is HIGH while the counter is in its
maximum count state (HLLH for the BCD counters, HHHH for
the Binary counters). Note that TC is fully decoded and will,
therefore, be HIGH only for one count state.
The LS160A and LS162A count modulo 10 following a
binary coded decimal (BCD) sequence. They generate a TC
output when the CET input is HIGH while the counter is in state
9 (HLLH). From this state they increment to state 0 (LLLL). If
loaded with a code in excess of 9 they return to their legitimate
sequence within two counts, as explained in the state
diagram. States 10 through 15 do not generate a TC output.
The LS161A and LS163A count modulo 16 following a
binary sequence. They generate a TC when the CET input is
HIGH while the counter is in state 15 (HHHH). From this state
they increment to state 0 (LLLL).
The Master Reset (MR) of the LS160A and LS161A is
asynchronous. When the MR is LOW , it overrides all other
input conditions and sets the outputs LOW. The MR pin should
never be left open. If not used, the MR pin should be tied
through a resistor to V CC, or to a gate output which is
permanently set to a HIGH logic level.
The active LOW Synchronous Reset (SR) input of the
LS162A and LS163A acts as an edge-triggered control input,
overriding CET, CEP and PE, and resetting the four counter
flip-flops on the LOW to HIGH transition of the clock. This
simplifies the design from race-free logic controlled reset
circuits, e.g., to reset the counter synchronously after
reaching a predetermined value.
MODE SELECT TABLE
*SR PE CET CEP Action on the Rising Clock Edge ( )
LX X
HL X
HH H
HH
L
HH X
X
X
H
X
L
RESET (Clear)
LOAD (Pn Qn)
COUNT (Increment)
NO CHANGE (Hold)
NO CHANGE (Hold)
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*For the LS162A and
*LS163A only.
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care


74LS160 Datasheet PDF
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SN54/74LS160A SN54/74LS161A
SN54/74LS162A SN54/74LS163A
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA Operating Ambient Temperature Range
IOH Output Current — High
IOL Output Current — Low
Min Typ Max Unit
54 4.5 5.0 5.5
74 4.75 5.0 5.25
V
54 – 55 25 125 °C
74 0 25 70
54, 74
– 0.4
mA
54 4.0 mA
74 8.0
LS160A and LS161A
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
54
VIL Input LOW Voltage
74
0.7 Guaranteed Input LOW Voltage for
0.8 V All Inputs
VIK
VOH
Input Clamp Diode Voltage
Output HIGH Voltage
54
74
– 0.65 – 1.5 V VCC = MIN, IIN = – 18 mA
2.5 3.5
2.7 3.5
V VCC = MIN, IOH = MAX, VIN = VIH
V or VIL per Truth Table
VOL
Output LOW Voltage
54, 74
74
0.25 0.4
0.35 0.5
V IOL = 4.0 mA
V IOL = 8.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
Input HIGH Current
MR, Data, CEP, Clock
IIH PE, CET
MR, Data, CEP, Clock
PE, CET
20 µA VCC = MAX, VIN = 2.7 V
40
0.1 mA VCC = MAX, VIN = 7.0 V
0.2
Input LOW Current
IIL MR, Data, CEP, Clock
PE, CET
– 0.4 mA VCC = MAX, VIN = 0.4 V
– 0.8
IOS
Short Circuit Current (Note 1)
– 20
– 100 mA VCC = MAX
Power Supply Current
ICC Total, Output HIGH
Total, Output LOW
31 mA VCC = MAX
32
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
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SN54/74LS160A SN54/74LS161A
SN54/74LS162A SN54/74LS163A
LS162A and LS163A
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
54
VIL Input LOW Voltage 74
0.7 Guaranteed Input LOW Voltage for
0.8 V All Inputs
VIK
VOH
Input Clamp Diode Voltage
Output HIGH Voltage
54
74
– 0.65 – 1.5
2.5 3.5
2.7 3.5
V VCC = MIN, IIN = – 18 mA
V VCC = MIN, IOH = MAX, VIN = VIH
V or VIL per Truth Table
VOL
Output LOW Voltage
54, 74
74
0.25 0.4
0.35 0.5
V IOL = 4.0 mA
V IOL = 8.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
Input HIGH Current
Data, CEP, Clock
IIH PE, CET, SR
Data, CEP, Clock
PE, CET, SR
20 µA VCC = MAX, VIN = 2.7 V
40
0.1 mA VCC = MAX, VIN = 7.0 V
0.2
Input LOW Current
IIL Data, CEP, Clock, PE, SR
CET
– 0.4
– 0.8
mA VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current (Note 1)
– 20
– 100 mA VCC = MAX
Power Supply Current
ICC Total, Output HIGH
Total, Output LOW
31 mA VCC = MAX
32
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25°C)
Symbol
fMAX
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPHL
Parameter
Maximum Clock Frequency
Propagation Delay
Clock to TC
Propagation Delay
Clock to Q
Propagation Delay
CET to TC
MR or SR to Q
Limits
Min Typ Max
25 32
20 35
18 35
13 24
18 27
9.0 14
9.0 14
20 28
Unit
MHz
ns
ns
ns
ns
Test Conditions
VCC = 5.0 V
CL = 15 pF
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SN54/74LS160A SN54/74LS161A
SN54/74LS162A SN54/74LS163A
AC SETUP REQUIREMENTS (TA = 25°C)
Symbol
Parameter
tWCP
Clock Pulse Width Low
tW MR or SR Pulse Width
ts Setup Time, other*
ts Setup Time PE or SR
th Hold Time, data
th Hold Time, other
trec Recovery Time MR to CP
*CEP, CET or DATA
Limits
Min Typ Max
25
20
20
25
3
0
15
Unit
ns
ns
ns
ns
ns
ns
ns
Test Conditions
VCC = 5.0 V
DEFINITION OF TERMS
SETUP TIME (ts) — is defined as theminimum time required
for the correct logic level to be present at the logic input prior to
the clock transition from LOW to HIGH in order to be recog-
nized and transferred to the outputs.
HOLD TIME (th) — is defined as the minimum time following
the clock transition from LOW to HIGHthat the logic level must
be maintained at the input in order to ensure continued recog-
nition. A negative HOLD TIME indicates that the correctlogic
level may be released prior to the clock transition from LOW to
HIGH and still be recognized.
RECOVERY TIME (trec) — is defined as the minimum time re-
quired between the end of the reset pulse and the clock transi-
tion from LOW to HIGH in order to recognize and transfer
HIGH Data to the Q outputs.
AC WAVEFORMS
tW(H)
tW(L)
CP 1.3 V
tPHL
1.3 V OTHER CONDITIONS:
PE = MR (SR) = H
tPLH CEP = CET = H
Q 1.3 V
1.3 V
Figure 1. Clock to Output Delays, Count
Frequency, and Clock Pulse Width
MR 1.3 V
tW
CP
Q0 Q1 Q2 Q3
tPHL
trec
1.3 V
OTHER CONDITIONS:
PE = L
P0 = P1 = P2 = P3 = H
1.3 V
Figure 2. Master Reset to Output Delay, Master Reset
Pulse Width, and Master Reset Recovery Time
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SN54/74LS160A SN54/74LS161A
SN54/74LS162A SN54/74LS163A
AC WAVEFORMS (continued)
COUNT ENABLE TRICKLE INPUT
TO TERMINAL COUNT OUTPUT DELAYS
CET 1.3 V
1.3 V
The positive TC pulse occurs when the outputs are in the
(Q0 Q1 Q2 Q3) state for the LS160 and LS162 and the
(Q0 Q1 Q2 Q3) state for the LS161 and LS163.
tPLH
TC 1.3 V
tPHL
1.3 V
Figure 3
OTHER CONDITIONS: CP = PE = CEP = MR = H
CLOCK TO TERMINAL COUNT DELAYS
The positive TC pulse is coincident with the output state
(Q0 Q1 Q2 Q3) state for the LS161 and LS163 and
(Q0 Q1 Q2 Q3) for the LS161 and LS163.
CP
Figure 4
TC
1.3 V
tPLH
1.3 V
1.3 V
1.3 V
tPHL
1.3 V
OTHER CONDITIONS: PE = CEP = CET = MR = H
SETUP TIME (ts) AND HOLD TIME (th)
FOR PARALLEL DATA INPUTS
The shaded areas indicate when the input is permitted to
change for predictable output performance.
CP
ts(H)
P0 P1 P2 P3
1.3 V
th(H) = 0 ts(L)
1.3 V 1.3 V
1.3 V
th(L) = 0
1.3 V
Q0 Q1 Q2 Q3
Figure 5
OTHER CONDITIONS: PE = L, MR = H
SETUP TIME (ts) AND HOLD TIME (th) FOR
COUNT ENABLE (CEP) AND (CET) AND
PARALLEL ENABLE (PE) INPUTS
The shaded areas indicate when the input is permitted to
change for predictable output performance.
CP
ts(L)
SR or PE
1.3 V 1.3 V
th (L) = 0 ts(H)
th(H) = 0
1.3 V
PARALLEL LOAD
(See Fig. 5)
1.3 V
COUNT MODE
(See Fig. 7)
Q RESPONSE TO PE
RESET
COUNT OR LOAD
Q RESPONSE TO SR
Figure 6
CP
ts(H)
CEP
ts(H)
CET 1.3 V
1.3 V
ts(L)
th(H) = 0
1.3 V
th(H) = 0
1.3 V
COUNT
1.3 V
th(L) = 0
1.3 V
ts(L)
HOLD
1.3 V
1.3 V
th(L) = 0
1.3 V
HOLD
Q
OTHER CONDITIONS: PE = H, MR = H
Figure 7
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