SN54-74LS169 查看數據表（PDF） - ON Semiconductor

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SN54-74LS169

BCD DECADE/MODULO 16 BINARY SYNCHRONOUS BI-DIRECTIONAL COUNTERS

ON Semiconductor 

BCD DECADE/MODULO

16 BINARY SYNCHRONOUS

BI-DIRECTIONAL COUNTERS

The SN54 / 74LS168 and SN54 / 74LS169 are fully synchronous 4-stage

up/down counters featuring a preset capability for programmable operation,

carry lookahead for easy cascading and a U / D input to control the direction

of counting. The SN54 / 74LS168 counts in a BCD decade (8, 4, 2, 1)

sequence, while the SN54 / 74LS169 operates in a Modulo 16 binary

sequence. All state changes, whether in counting or parallel loading, are

initiated by the LOW-to-HIGH transition of the clock.

• Low Power Dissipation 100 mW Typical

• High-Speed Count Frequency 30 MHz Typical

• Fully Synchronous Operation

• Full Carry Lookahead for Easy Cascading

• Single Up / Down Control Input

• Positive Edge-Trigger Operation

• Input Clamp Diodes Limit High-Speed Termination Effects

CONNECTION DIAGRAM DIP (TOP VIEW)

VCC TC Q0 Q1 Q2 Q3 CET PE

16 15 14 13 12 11 10 9

1234

U/D CP P0 P1

56 78

P2 P3 CEP GND

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

PIN NAMES

LOADING (Note a)

HIGH

LOW

CEP Count Enable Parallel (Active LOW) Input

0.5 U.L. 0.25 U.L.

CET Count Enable Trickle (Active LOW) Input

1.0 U.L.

0.5 U.L.

CP

Clock Pulse (Active positive going edge) Input 0.5 U.L. 0.25 U.L.

PE

Parallel Enable (Active LOW) Input

0.5 U.L. 0.25 U.L.

U/D

Up-Down Count Control Input

0.5 U.L. 0.25 U.L.

P0–P3 Parallel Data Inputs

Q0–Q3 Flip-Flop Outputs

TC

Terminal Count (Active LOW) Output

0.5 U.L.

10 U.L.

10 U.L.

0.25 U.L.

5 (2.5) U.L.

5 (2.5) U.L.

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 5 U.L. for Commercial (74)

b. Temperature Ranges.

SN54/74LS168

SN54/74LS169

BCD DECADE / MODULO

16 BINARY SYNCHRONOUS

BI-DIRECTIONAL 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

SN74LSXXXN

SN74LSXXXD

Ceramic

Plastic

SOIC

LOGIC SYMBOL

93 4 5 6

1

PE P0 P1 P2 P3

U/D

7

CEP

10

CET

TC

15

2

CP

Q0 Q1 Q2 Q3

14 13 12 11

VCC = PIN 16

GND = PIN 8

FAST AND LS TTL DATA

5-1

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