INTEGRAL IN74AC161N Datasheet

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