ST M74HC161 User Manual

M74HC161

SYNCHRONOUS PRESETTABLE 4-BIT COUNTER

■ HIGH SPEED :

f

= 62 MHz (TYP.) at VCC = 6V

MAX

■ LOW POWER DISSIPATION:

I

=4µA(MAX.) at TA=25°C

CC

■ HIGH NOISE IMMUNITY:

V

= V

NIH

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

| = IOL = 4mA (MIN)

OH

■ BALANCED PROPAGATION DELAYS:

t

≅ t

PLH

■ WIDE OPERATING VOLTAGE RANGE:

V

(OPR) = 2V to 6V

CC

■ PIN AND FUNCTION COMPATIBLE WITH

= 28 % VCC (MIN.)

NIL

PHL

74 SERIES 161

DESCRIPTION

The M74HC161 is an high speed CMOS SYNCHRONOUS 4-BIT BINARY PRESETTABLE COU NTER fa bri cated wit h si licon gate C

2

MOS technology. The CLOCK input is active on the rising edge. Both LOAD

and CLEAR input s are active LOW. Presetting is synchronous on the rising edge of the clock, the function is cleared asynchronously.

TSSOPDIP SOP

ORDER CODES

PACKAGE TUBE T & R

DIP M74HC161B1R

SOP M74HC161M1R M74HC161RM13TR

TSSOP M74HC161TTR

Two enable inputs (TE and PE) and CARRY output are provided to enable easy cascading of counters, which f acilities easy imp lementation of N-bit counters without using external gates. All inputs are equipped with protection circuits against static discharge and transient excess voltage.

PIN CONNECTION AND IEC LOGIC SYMBOLS

1/12July 2001

M74HC161

INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION

PIN No SYMBOL NAME AND FUNCTION

1 CLEAR

2 CLOCK

3, 4, 5, 6 A, B, C, D Data Inputs

7 PE Count Enable Input

10 TE Count Enable Carry Input

9LOAD

14, 13, 12,

11 15 CARRY Terminal Count Output

8 GND Ground (0V)

16 Vcc Positive Supply Voltage

TRUTH TABLE

QA to QD Flip Flop Outputs

Asynchronous Master Reset

Clock Input (LOW to HIGH, Edge-trigge red)

Parallel Enable Input

INPUTS OUTPUTS

FUNCTION

CLEAR

LOAD PE TE CLOCK QA QB QC QD

L X X X X L L L L RESET TO "0"

H L X X A B C D 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 A, B, C, D : Logic level of data inputs Carry : CARRY = TE·Q

A·QB·QC·QD

LOGIC DIAGRAM

This log i c diagram has not be used to est i m at e propagation delays

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TIMING CHART

M74HC161

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

I

OK

I

or I

CC

P

T

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied (*) 500mW at 65

Supply Voltage

CC

DC Input Voltage -0.5 to VCC + 0.5

I

DC Output Voltage -0.5 to VCC + 0.5

O

DC Input Diode Current

IK

DC Output Diode Current

DC Output Current

O

DC VCC or Ground Current

GND

Power Dissipation

D

Storage Temperature

stg

Lead Temperature (10 sec)

L

°C; derate to 300mW by 10mW/°C from 65°C to 85°C

-0.5 to +7 V V V

± 20 mA ± 20 mA ± 25 mA ± 50 mA

500(*) mW

-65 to +150 °C

300 °C

3/12

M74HC161

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Value Unit

V

T

t

r

DC SPECIFICATIONS

Symbol Parameter

V

IH

V

IL

V

OH

V

OL

I

CC

Supply Voltage

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature

op

Input Rise and Fall Time VCC = 2.0V

, t

f

V V

CC CC

= 4.5V = 6.0V

Test Condition Value

= 25°C

T

A

Min. Typ. Max. Min. Max. Min. Max.

High Level Input

V

CC

(V)

2.0 1.5 1.5 1.5

Voltage

6.0 4.2 4.2 4.2

Low Level Input

2.0 0.5 0.5 0.5

Voltage

6.0 1.8 1.8 1.8

High Level Output Voltage

Low Level Output Voltage

Input Leakage Current

Quiescent Supply Current

2.0

4.5

6.0

4.5

6.0

2.0

4.5

6.0

4.5

6.0

IO=-20 µA I

=-20 µA

O

I

=-20 µA

O

I

=-4.0 mA

O

I

=-5.2 mA

O

IO=20 µA I

=20 µA

O

I

=20 µA

O

I

=4.0 mA

O

I

=5.2 mA

O

= VCC or GND

V

I

= VCC or GND

V

I

1.9 2.0 1.9 1.9

4.4 4.5 4.4 4.4

5.9 6.0 5.9 5.9

4.18 4.31 4.13 4.10

5.68 5.8 5.63 5.60

0.0 0.1 0.1 0.1

0.17 0.26 0.33 0.40

0.18 0.26 0.33 0.40 ± 0.1 ± 1 ± 1 µA

44080µA

2 to 6 V

CC CC

-55 to 125 °C

0 to 1000 ns

0 to 500 ns 0 to 400 ns

-40 to 85°C -55 to 125°C

V V

Unit

V4.5 3.15 3.15 3.15

V4.5 1.35 1.35 1.35

V

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