Philips N74ALS74AD, N74ALS74ADB, N74ALS74AN Datasheet

INTEGRATED CIRCUITS

74ALS74A

Dual D-type flip-flop with set and reset

Product specification

1996 Jul 01

IC05 Data Handbook

m n r

Philips Semiconductors	Product specification
Dual D-type flip-flop with set and reset	74ALS74A

DESCRIPTION

The 74ALS74 is a dual positive edge-triggered D-type flip-flop featuring individual data, clock, set, and reset inputs; also true and complementary outputs. Set (SD) and reset (RD) are asynchronous active-Low inputs and operate independently of the clock input. When set and reset are inactive (High), data at the D input is transferred to the Q and Q outputs on the Low-to-High transition of the clock. Data must be stable just one setup time prior to the Low-to-High transition of the clock for predictable operation. Clock triggering occurs at a voltage level and is not directly related to the transition time of the positive-going pulse. Following the hold time interval, data at the D input may be changed without affecting the levels of the output.

		TYPICAL
TYPE	TYPICAL fMAX	SUPPLY CURRENT
		(TOTAL)
74ALS74A	150MHz	3.0mA

ORDERING INFORMATION

		ORDER CODE
			DRAWING
	DESCRIPTION	COMMERCIAL RANGE
		VCC = 5V ±10%,	NUMBER
		Tamb = 0°C to +70°C
	14-pin plastic DIP	74ALS74AN	SOT27-1
	14-pin plastic SO	74ALS74AD	SOT108-1
	14-pin plastic SSOP	74ALS74ADB	SOT337-1
	Type II

PIN CONFIGURATION

	RD0					1		14	VCC
				D0
						2		13		RD1
	CP0								D1
						3		12
									CP1
		SD0				4		11
		Q0
						5		10		SD1
									Q1
			Q0			6		9
GND
						7		8		Q1
							SF00045

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74ALS (U.L.)

LOAD VALUE

HIGH/LOW

HIGH/LOW

D0, D1

Data inputs

1.0/2.0

20μA/0.2mA

CP0, CP1

Clock inputs (active rising edge)

1.0/2.0

20μA/0.2mA

Set inputs (active-Low)

2.0/4.0

40μA/0.4mA

SD0, SD1

Reset inputs (active-Low)

2.0/4.0

40μA/0.4mA

RD0, RD1

Q0, Q1,

Data outputs

20/80

0.4mA/8mA

Q0, Q1

NOTE: One (1.0) ALS unit load is defined as: 20μA in the High state and 0.1mA in the Low state.

LOGIC SYMBOL

IEC/IEEE SYMBOL

2

12

4

S

&

5

3

CP0

D0

D1

3

C1

2

1D

6

4

SD0

1

R

1

RD0

11

CP1

10

S

10

SD1

9

11

13

RD1

C2

12

Q0

Q0

Q1 Q1

2D

8

13

R

VCC = Pin 14

5

6

9 8

GND = Pin 7

SF00046

SF00047

1996 Jul 01

2

853±1278 01670

Philips Semiconductors	Product specification
Dual D-type flip-flop with set and reset	74ALS74A

LOGIC DIAGRAM

SD	4, 10
RD	1, 13	5, 9
		Q
	3, 11	6, 8
CP		Q
D	2, 12
VCC = Pin 14
GND = Pin 7
		SF00048

FUNCTION TABLE

INPUTS

OUTPUTS

OPERATING

CP

D

Q

MODE

SD

RD

Q

L

H

X

X

H

L

Asynchronous set

H

L

X

X

L

H

Asynchronous reset

L

L

X

X

H

H

Undetermined*

H

H

↑

h

H

L

Load ª1º

H

H

↑

l

L

H

Load ª0º

H

H

↑

X

NC

NC

Hold

H = High voltage level

h= High state must be present one setup time prior to Low-to-High clock transition

L = Low voltage level

l= Low state must be present one setup time prior to Low-to-High clock transition

NC=	No change from the previous setup
X =	Don't care

↑= Low-to-High clock transition

↑= Not Low-to-High clock transition

*= Both outputs will be High while both SD and RD are Low, but the output states are unpredictable if SD and RD go High simultaneously

ABSOLUTE MAXIMUM RATINGS

(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the operating free-air temperature range.)

SYMBOL	PARAMETER	RATING	UNIT
VCC	Supply voltage	±0.5 to +7.0	V
VIN	Input voltage	±0.5 to +7.0	V
IIN	Input current	±30 to +5	mA
VOUT	Voltage applied to output in High output state	±0.5 to VCC	V
IOUT	Current applied to output in Low output state	16	mA
Tamb	Operating free-air temperature range	0 to +70	°C
Tstg	Storage temperature range	±65 to +150	°C

RECOMMENDED OPERATING CONDITIONS

	SYMBOL	PARAMETER		LIMITS		UNIT
			MIN	NOM	MAX
	VCC	Supply voltage	4.5	5.0	5.5	V
	VIH	High-level input voltage	2.0			V
	VIL	Low-level input voltage			0.8	V
	IIk	Input clamp current			±18	mA
	IOH	High-level output current			±0.4	mA
	IOL	Low-level output current			8	mA
	Tamb	Operating free-air temperature range	0		+70	°C

1996 Jul 01

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