Philips N74ALS253N, N74ALS253DB, N74ALS253D Datasheet

INTEGRATED CIRCUITS

74ALS253

Dual 4±input multiplexer (3±State)

Product specification	1991 Feb 08
IC05 Data Handbook

m n r

Philips Semiconductors	Product specification
Dual 4-input multiplexer (3-State)	74ALS253

FEATURES

•3-State outputs for bus interface and multiplex operation

•Common select inputs

•Separate output enable inputs

DESCRIPTION

The 74ALS253 has two identical 4-input multiplexers with 3-State outputs which select 2 bits from four sources by using common

select input (S0, S1). When the individual output enable (OEa, OEb) inputs of the 4-input multiplexers are High, the outputs are forced to a High impedance (Z) state.

The 74ALS253 is the logic implementation of 2-pole, 4-position switch being determined by the logic levels supplied to the common select inputs.

To avoid exceeding the maximum current ratings when the outputs of the 3-State devices are tied together, all but one device must be in the High impedance state. Therefore, only one output enable must be achieved at a time.

		TYPICAL	TYPICAL
	TYPE		SUPPLY CURRENT
		PROPAGATION DELAY
			(TOTAL)
	74ALS253	7.0ns	8mA

PIN CONFIGURATION

	OEa		1				16	VCC
	S1
			2				15		OEb
	I3a							S0
			3				14
	I2a							I3b
			4				13
	I1a							I2b
			5				12
	I0a							I1b
			6				11
	Ya							I0b
			7				10
GND								Yb
			8				9

SF00798

ORDERING INFORMATION

		ORDER CODE
			DRAWING
	DESCRIPTION	COMMERCIAL RANGE
			NUMBER
		VCC = 5V ±10%,
		Tamb = 0°C to +70°C
	16-pin plastic DIP	74ALS253N	SOT38-4
	16-pin plastic SO	74ALS253D	SOT109-1
	16-pin plastic SSOP	74ALS253DB	SOT338-1
	Type II

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS																		DESCRIPTION									74ALS (U.L.)									LOAD VALUE
																												HIGH/LOW								HIGH/LOW
I0a ± I3a							Port A data inputs																					1.0/1.0								20μA/0.1mA
I0b ± I3b							Port B data inputs																					1.0/1.0								20μA/0.1mA
S0, S1							Common select inputs																					1.0/1.0								20μA/0.1mA
							Port A Output Enable input (active-Low)																					1.0/1.0								20μA/0.1mA
	OEa
							Port B Output Enable input (active-Low)																					1.0/1.0								20μA/0.1mA
	OEb
Ya ± Yb							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
				6		5		4		3			10			11		12		13				14
																													0			G	0
																										2			2				3
				I0a		I1a		I2a			I3a			I0b		I1b		I2b		I3b							1		EN				MUX
																											6
14				S0																									0							7
																											5
2				S1																									1
																											4
1				OEa																									2
																								3
																													3
15
				OEb						Ya			Yb														15
																											10									9
																											11
																											12
VCC = Pin 16										7			9											13
GND = Pin 8
																						SF00799														SC00073

1991 Feb 08

2

853±1378 01670

Philips Semiconductors	Product specification
Dual 4-input multiplexer (3-State)	74ALS253

LOGIC DIAGRAM

OEa	I0a	I1a	I2a	I3a	S1	S0	I0b	I1b	I2b	I3b	OEb
1	6	5	4	3	2	14	10	11	12	13	15

7	9
Ya	Yb

VCC = Pin 16
GND = Pin 8	SC00074

FUNCTION TABLE

INPUTS

OUTPUTS

S0

S1

I0

I1

I2

I3

Yn

OEn

X

X

X

X

X

X

H

Z

L

L

L

X

X

X

L

L

L

L

H

X

X

X

L

H

H

L

X

L

X

X

L

L

H

L

X

H

X

X

L

H

L

H

X

X

L

X

L

L

L

H

X

X

H

X

L

H

H

H

X

X

X

L

L

L

H

H

X

X

X

H

L

H

H

=

High voltage level

L

=

Low voltage level

X

=

Don't care

Z

=

High impedance ªoffº state

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