Philips N74ALS273DB, N74ALS273D, N74ALS273N Datasheet

INTEGRATED CIRCUITS

74ALS273

Octal D±type flip±flop

Product specification	1991 Feb 08
IC05 Data Handbook

m n r

Philips Semiconductors	Product specification
Octal D-type flip-flop	74ALS273

FEATURES

•Eight edge-triggered D-type flip-flops

•Buffered common clock

•Buffered asynchronous master reset

•See 74ALS377 for clock enable version

•See 74ALS373 for transparent latch version

•See 74ALS374 for 3-State version

DESCRIPTION

The 74ALS273 has eight edge-triggered D-type flip-flops with individual D inputs and Q outputs. The common buffered clock (CP) and master reset (MR) inputs load and reset all flip-flops simultaneously.

The register is fully edge-triggered. The state of each D input, one setup time before the Low-to-High clock transition, is transferred to the corresponding flip-flop's Q output.

All outputs will be forced Low independently of clock or data inputs by a Low voltage level on the MR input.

The device is useful for applications where the true output only is required and the CP and MR are common to all flip-flops.

		TYPICAL
TYPE	TYPICAL fMAX	SUPPLY CURRENT
		(TOTAL)
74ALS273	95MHz	16mA

PIN CONFIGURATION

	MR		1	20	VCC
	Q0		2	19	Q7
	D0		3	18	D7
	D1		4	17	D6
	Q1		5	16	Q6
	Q2		6	15	Q5
	D2		7	14	D5
	D3		8	13	D4
	Q3		9	12	Q4
GND			10	11	CP

			SF00346
	ORDERING INFORMATION
		ORDER CODE
			DRAWING
	DESCRIPTION	COMMERCIAL RANGE
			NUMBER
		VCC = 5V ±10%,
		Tamb = 0°C to +70°C
	20-pin plastic DIP	74ALS273N	SOT146-1
	20-pin plastic SO	74ALS273D	SOT163-1
	20-pin plastic SSOP	74ALS273DB	SOT339-1
	Type II

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS																DESCRIPTION							74ALS (U.L.)									LOAD VALUE
																								HIGH/LOW								HIGH/LOW
D0 ± D7								Data inputs																	1.0/2.0							20μA/0.2mA
	CP							Clock pulse input (active rising edge)																	1.0/1.0							20μA/0.1mA
								Master Reset input (active-Low)																	1.0/1.0							20μA/0.1mA
	MR
Q0 ± Q7								3-State outputs																	130/240							2.6mA/24mA
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
				3		4		7		8		13		14		17		18				1
																										R
																						11
																										C1
				D0		D1		D2		D3		D4		D5		D6		D7				3								2
11				CP																						1D
																						4								5
1				MR
																						7										6
				Q0		Q1		Q2		Q3		Q4		Q5		Q6		Q7				8										9
																						13										12
																						14										15
				2		5		6		9		12		15		16		19
																						17										16
VCC = Pin 20																						18									19
GND = Pin 10																				SF00347													SF00348

1991 Feb 08

2

853±1398 01670

Philips Semiconductors	Product specification
Octal D-type flip-flop	74ALS273

LOGIC DIAGRAM

	D0	D1	D2	D3	D4	D5	D6	D7
	3	4	7	8	13	14	17	18
CP	11
	D Q	D Q	D Q	D Q	D Q	D Q	D Q	D Q
	CP	CP	CP	CP	CP	CP	CP	CP
	RD	RD	RD	RD	RD	RD	RD	RD
MR	1
		2	5	6	9	12	15	16	19
		Q0	Q1	Q2	Q3	Q4	Q5	Q6	Q7
VCC = Pin 20
GND = Pin 10									SF00349

FUNCTION TABLE

					INPUTS			OUTPUTS	OPERATING MODE
		MR			CP		Dn	Qn
		L			X		X	L	Reset (clear)
		H			↑		h	H	Load ª1º
		H			↑		l	L	Load ª0º
H	=	High-voltage level
h	=	High state must be present one setup time before the Low-to-High clock transition
L	=	Low-voltage level
l	=	Low state must be present one setup time before the Low-to-High clock transition
X	=	Don't care
↑	=	Low-to-High clock transition

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	48	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			±2.6	mA
	IOL	Low-level output current			24	mA
	Tamb	Operating free-air temperature range	0		+70	°C

1991 Feb 08

3