Motorola SN54LS168J, SN54LS169J, SN74LS168D, SN74LS168N, SN74LS169D Datasheet

Q0 Q1 Q2 Q3

14 13 12 11

VCC = PIN 16 GND = PIN 8

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
																	NOTE:
																	The Flatpak version
																	has the same pinouts
																	(Connection Diagram) as
																	the Dual In-Line Package.
	1		2		3		4		5		6		7		8
	U/D		CP		P0		P1		P2		P3		CEP		GND

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	0.5	U.L.	0.25	U.L.
Q0±Q3				Flip-Flop Outputs	10	U.L.	5 (2.5)	U.L.
TC				Terminal Count (Active LOW) Output	10	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

			J SUFFIX
			CERAMIC
			CASE 620-09
16	1
			N SUFFIX
			PLASTIC
16			CASE 648-08
	1
			D SUFFIX
	16		SOIC
			CASE 751B-03
		1

ORDERING INFORMATION

SN54LSXXXJ Ceramic

SN74LSXXXN Plastic

SN74LSXXXD SOIC

LOGIC SYMBOL

9 3 4 5 6

PE P0 P1 P2 P3

1U/D

	7	CEP	TC	15
	10	CET

2CP

FAST AND LS TTL DATA

5-302

SN54/74LS168 •SN54/74LS169

					STATE DIAGRAMS
	SN54/ 74LS168						SN54 / 74LS169
UP / DOWN DECADE COUNTER
0	1	2	3	4		0	1	2	3	4
15				5		15				5
14				6	Count Up	14				6
					Count Down
13				7		13				7
12	11	10	9	8		12	11	10	9	8
SN54 / 74LS168						SN54 / 74LS169
UP:	TC = Q0 Q3 (U / D)					UP:	TC = Q0 Q1 Q2 Q3 (U / D)
DOWN:	TC = Q0 Q1 Q2 Q3 (U / D)					DOWN:	TC = Q0 Q1 Q2 Q3 (U / D)

			LOGIC DIAGRAMS
			SN54 / 74LS168
	P0	P1	P2	P3
PE
CEP
CET
U/D
				TC
CP
CP	D
	Q0	Q1	Q2	Q3

FAST AND LS TTL DATA

5-303

		SN54/74LS168 •SN54/74LS169
			LOGIC DIAGRAMS (continued)
			SN54 / 74LS169
	P0	P1	P2	P3
PE
CEP
CET
U/D
				TC
CP
CP	D
	Q0	Q1	Q2	Q3

GUARANTEED OPERATING RANGES

Symbol	Parameter		Min	Typ	Max	Unit
VCC	Supply Voltage	54	4.5	5.0	5.5	V
		74	4.75	5.0	5.25
TA	Operating Ambient Temperature Range	54	± 55	25	125	°C
		74	0	25	70
IOH	Output Current Ð High	54, 74			± 0.4	mA
IOL	Output Current Ð Low	54			4.0	mA
		74			8.0

FAST AND LS TTL DATA

5-304