Philips N74F253D, N74F253N Datasheet

INTEGRATED CIRCUITS

74F253

Dual 4-bit input multiplexer (3-State)

Product specification

1988 Nov 29

IC15 Data Handbook

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Philips Semiconductors	Product specification
Dual 4-input multiplexer (3-State)	74F253

FEATURES

•3-State outputs for bus interface and multiplex expansion

•Common select inputs

•Separate Output Enable Inputs

DESCRIPTION

The 74F253 has two identical 4-input multiplexers with 3-State outputs which select two bits from four sources selected by common Select inputs (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 (Hi-Z) state.

The 74F253 is the logic implementation of a 2-pole, 4-position switch; the position of the switch being determined by the logic levels supplied to the two 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 active at a time.

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
	TYPICAL	TYPICAL
TYPE	PROPAGATION	SUPPLY CURRENT
	DELAY	(TOTAL)
74F253	7.0ns	12mA

					ORDERING INFORMATION
						COMMERCIAL RANGE
					DESCRIPTION					PKG DWG #
						VCC = 5V ±10%,
						Tamb = 0°C to +70°C
					16-pin plastic DIP		N74F253N			SOT38-4
					16-pin plastic SO		N74F253D			SOT109-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS			DESCRIPTION		74F (U.L.) HIGH/LOW			LOAD VALUE HIGH/LOW
I0a±I3a			Port A data inputs		1.0/1.0				20μA/0.6mA
I0b±I3b			Port B data inputs		1.0/1.0				20μA/0.6mA
S0, S1			Common Select inputs		1.0/1.0				20μA/0.6mA
			Port A Output Enable input (active Low)		1.0/1.0				20μA/0.6mA
	OEa
			Port B Output Enable input (active Low)		1.0/1.0				20μA/0.6mA
	OEb
Ya, Yb			3-State outputs		150/40				3mA/24mA

NOTE:

One (1.0) FAST unit load is defined as: 20μA in the High state and 0.6mA in the Low state.

LOGIC SYMBOL																					IEC/IEEE SYMBOL
		6	5		4		3			10			11		12		13				14
																								0		G	0
																						2		1			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													SF00800

1988 Nov 29

2

853±0101 95206

Philips Semiconductors	Product specification
Dual 4-input multiplexer (3-State)	74F253

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

VCC = Pin 16			7			9
	Ya			Yb
GND = Pin 8						SF00801

FUNCTION TABLE

INPUTS

OUTPUT

S0

S1

I0

I1

I2

I3

OE

Y

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

NOTES:

H

=

High voltage level

L

=

Low voltage level

X

=

Don't care

Z

=

High impedance ªoffº state

1988 Nov 29

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