Presettable Counter
High-Speed Silicon-Gate CMOS
The IN74AC161 is identical in pinout to the LS/ALS161,
HC/HCT161. The device inputs are compatible with standard CMOS
outputs; with pullup resistors, they are compatible with LS/ALS
outputs.
The IN74AC161 is programmable 4-bit synchronous modulo-16
counter that feature parallel Load, asynchronous Reset, a Carry Output
for cascading and count-enable controls.
The IN74AC161 is binary counter with asynchronous Reset.
•
Outputs Directly Interface to CMOS, NMOS, and TTL
•
Operating Voltage Range: 2.0 to 6.0 V
•
Low Input Current: 1.0 µA; 0.1 µA @ 25° C
•
High Noise Immunity Characteristic of CMOS Devices
•
Outputs Source/Sink 24 mA
LOGIC DIAGRAM
TECHNICAL DATA
IN74AC161
ORDERING INFORMATION
IN74AC161N Plastic
IN74AC161D SOIC
TA = -40° to 85° C for all
packages
PIN ASSIGNMENT
Outputs
PIN 16 =V
PIN 8 = GND
Reset Load EnablePEnableTClockQ0Q1Q2Q3 Function
L X X X X L L L L Reset to “0”
H L X X P0 P1 P2 P3 Preset Data
H H X L No change No count
H H L X No change No count
H H H H Count up Count
H X X X No change No count
X=don’t care
P0,P1,P2,P3 = logic level of Data inputs
Ripple Carry Out = Enable T • Q0 • Q1 • Q2 • Q3
CC
FUNCTION TABLE
Inputs Outputs
213
IN74AC161
MAXIMUM RATINGS
*
Symbol Parameter Value Unit
V
CC
V
V
OUT
I
IN
I
OUT
I
CC
P
DC Supply Voltage (Referenced to GND) -0.5 to +7.0 V
DC Input Voltage (Referenced to GND) -0.5 to VCC +0.5 V
IN
DC Output Voltage (Referenced to GND) -0.5 to VCC +0.5 V
DC Input Current, per Pin
DC Output Sink/Source Current, per Pin
DC Supply Current, VCC and GND Pins
Power Dissipation in Still Air, Plastic DIP+
D
SOIC Package+
±
20
±
50
±
50
750
500
Tstg Storage Temperature -65 to +150
T
Lead Temperature, 1 mm from Case for 10 Seconds
L
260
(Plastic DIP or SOIC Package)
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
mA
mA
mA
mW
°
C
°
C
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Max Unit
V
CC
VIN, V
T
J
T
A
I
OH
I
OL
tr, t
f
*
VIN from 30% to 70% V
This device c ontains p rote ction ci rcuitr y to guard a gainst damage d ue to high st atic voltages or electr ic
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated
voltages to this high-impedance circuit. For proper operation, V
GND≤(V
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V
Unused outputs must be left open.
DC Supply Voltage (Referenced to GND) 2.0 6.0 V
DC Input Voltage, Output Voltage (Referenced to GND) 0 V
OUT
Junction Temperature (PDIP) 140
Operating Temperature, All Package Types -40 +85
Output Current - High -24 mA
Output Current - Low 24 mA
Input Rise and Fall Time
(except Schmitt Inputs)
IN
or V
OUT
)≤VCC.
CC
*
V
V
V
=3.0 V
CC
=4.5 V
CC
=5.5 V
CC
and V
IN
0
0
0
should be constrained to the range
OUT
CC
150
40
25
V
°
C
°
C
ns/V
CC
).
214
IN74AC161
DC ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND)
Symbol Parameter Test Conditions V
V
Minimum High-Level
IH
V
=0.1 V or VCC-0.1 V 3 .0
OUT
Input Voltage
V
Maximum Low -
IL
V
= VCC-0.1 V or 0.1 V 3.0
OUT
Level Input Voltage
V
OH
Minimum High-Level
I
OUT
≤ -50 µA
Output Voltage
*
VIN=VIH or V
IL
IOH=-12 mA
I
=-24 mA
OH
I
=-24 mA
OH
V
OL
Maximum Low-Level
I
OUT
≤ 50 µA
Output Voltage
*
VIN=VIH or V
IL
IOL=12 mA
I
=24 mA
OL
I
=24 mA
OL
I
IN
Maximum Input
VIN=VCC or GND 5.5
Leakage Current
I
OLD
+Minimum Dynamic
V
=1.65 V Max 5.5 75 mA
OLD
Output Current
I
OHD
+Minimum Dynamic
V
=3.85 V Min 5.5 -75 mA
OHD
Output Current
I
CC
Maximum Quiescent
VIN=VCC or GND 5.5 8.0 8.0
Supply Current
(per Package)
*
All outputs loaded; thresholds on input associated with output under test.
+Maximum test duration 2.0 ms, one output loaded at a time.
Note: I
IN
and I
@ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V V
CC
V
4.5
5.5
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
CC
Guaranteed Limits
25 °C-40
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.1
0.1
0.1
0.36
0.36
0.36
±
0.1
°
C to
85°C
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.46
3.76
4.76
0.1
0.1
0.1
0.44
0.44
0.44
±
1.0
CC
Unit
V
V
V
V
µ
A
µ
A
215
IN74AC161
AC ELECTRICAL CHARACTERISTICS
(CL=50pF,Input tr=tf=3.0 ns)
Symbol Parameter V
f
t
t
t
max
PLH
PHL
PLH
Maximum Clock Frequency (Figur e 1) 3.3
Propagat ion Delay, Clock to Q (Figure 1) 3.3
Propagat ion Delay, Clock to Q (Figure 1) 3.3
Propagation Delay, Clock to Ripple Carry Out
(Figure 1)
t
PHL
Propagation Delay, Clock to Ripple Carry Out
(Figure 1)
t
PLH
Propagation Delay, Enable T to Ripple Carry
Out (Figure 3)
t
PHL
Propagation Delay, Enable T to Ripple Carry
Out (Figure 3)
t
t
PHL
PHL
Propagation Delay, Reset to Q (Figure 2) 3.3
Propagation Delay, Reset to Ripple Carry Out
(Figure 2)
C
IN
Maximum Input Capacitance 5.0 4.5 4.5 pF
*
V
CC
Min Max Min Max
5.070110
5.0
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
5.0
3.3
5.0
Guaranteed Limits
25 °C-40
°
C to
85°C
60
95
2.0
1.5
1.5
1.5
3.0
2.0
3.5
2.0
2.0
1.5
2.5
2.0
2.0
1.5
3.5
2.5
12.0
9.0
12.0
9.5
15.0
10.5
14.0
11.0
9.5
6.5
11.0
8.5
12.0
9.5
15.0
13.0
1.5
1.0
1.5
1.5
2.5
1.5
2.5
2.0
1.5
1.0
2.0
1.5
1.5
1.5
3.0
2.5
13.5
9.5
13.0
10.0
16.5
11.5
15.5
11.5
11.0
7.5
12.5
9.5
13.5
10.0
17.5
13.5
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
ns
C
PD
*
Voltage Range 3.3 V is 3.3 V ±0.3 V
Power Dissipation Capacitance 45 pF
Voltage Range 5.0 V is 5.0 V ±0.5 V
216
Typical @25°C,VCC=5.0 V
IN74AC161
TIMING REQUIREMENTS
(CL=50pF,Input tr=tf=3.0 ns)
Symbol Parameter V
t
su
Minimum Setup Time, Preset Data Inputs to
Clock (Figure 4)
t
h
Minimum Hold Time, Clock to Preset Data Inputs
(Figure 4)
t
su
t
h
t
su
Minimum Setup Time,Load to Clock (Figure 4) 3.3
Minimum Hold Time, Cl ock to Load (Figure 4) 3.3
Minimum Setup Time, Enable T or Enable P to
Clock (Figure 5)
t
h
Minimum Hold Time, C lock to Enable T or
Enable P (Figure 5)
t
w
t
w
t
w
t
rec
*
Voltage Range 3.3 V is 3.3 V ±0.3 V
Minimum Pulse Width, Clock (Load) (Figure 1) 3.3
Minimum Pulse Width, Cl ock (Count)(F igure 1) 3.3
Minimum Pulse Width, Reset (Figure 2) 3.3
Minimum Recovery Time, Reset t o Clock (Figure2)3.3
Voltage Range 5.0 V is 5.0 V ±0.5 V
V
CC
3.3
5.0
3.3
5.0
5.0
5.0
3.3
5.0
3.3
5.0
5.0
5.0
5.0
5.0
*
Guaranteed Limit
+25° C-40
°
C
Unit
to +85° C
13.5
8.5
-1.0
0
11.5
7.5
0
0.5
6.0
4.5
0
0
3.5
2.5
4.0
3.0
5.5
4.5
-0.5
0
16.0
10.5
-0.5
0
14.0
8.5
0
1.0
7.0
5.0
0
0.5
4.0
3.0
4.5
3.5
7.5
6.0
0
0.5
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
217
IN74AC161
Figure 1. Switching Waveform Figure 2. Switching Waveform
218
Figure 3. Switching Waveform Figure 4. Switching Waveform
Figure 5. Switching Waveform
IN74AC161
Sequence illustrated in waveforms:
1. Reset outputs to zero.
2. Preset to binary twelve.
3. Count to thirteen, fourteen, fifteen, zero, one, and two.
4. Inhibit.
Figure 8. Timing Diagram
219
IN74AC161
EXPANDED LOGIC DIARAM
220
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