Texas Instruments CD74ACT257M, CD74ACT257E, CD74ACT258M96, CD74ACT258M, CD74ACT257SM Datasheet

Data sheet acquired from Harris Semiconductor SCHS248

August 1998

CD74AC257, CD74ACT257, CD74ACT258

Quad 2-Input Multiplexer with Three-State Outputs

Features

Description

•CD74AC257, CD74ACT257 . . . . Non-Inverting Outputs

•CD74ACT258 . . . . . . . . . . . . . . . . . . . Inverting Outputs

•Buffered Inputs

•Typical Propagation Delay

-4.4ns at VCC = 5V, TA = 25oC, CL = 50pF

•Exceeds 2kV ESD Protection MIL-STD-883, Method 3015

•SCR-Latchup-Resistant CMOS Process and Circuit Design

•Speed of Bipolar FAST™/AS/S with Significantly Reduced Power Consumption

•Balanced Propagation Delays

•AC Types Feature 1.5V to 5.5V Operation and Balanced Noise Immunity at 30% of the Supply

•±24mA Output Drive Current

-Fanout to 15 FAST™ ICs

Drives 50Ω Transmission Lines

Pinout

CD74AC257, CD74ACT257, CD74ACT258

(PDIP, SOIC)

TOP VIEW

ACT258	AC/ACT257
S	S	1
1I0	1I0	2
1I1	1I1	3
1Y	1Y	4
2I0	2I0	5
2I1	2I1	6
2Y	2Y	7
GND	GND	8

AC/ACT257 ACT258

16	VCC	VCC
15	OE	OE
14	4I0	4I0
13	4I1	4I1
12	4Y	4Y
11	3I0	3I0
10	3I1	3I1
9	3Y	3Y

The CD74AC257, CD74ACT257 and CD74ACT258 are quad 2-input multiplexers with three-state outputs that utilize the Harris Advanced CMOS Logic technology. Each of these devices selects four bits of data from two sources under the control of a common Select input (S). The Output Enable (OE) is active LOW. When OE is HIGH, all of the outputs (Y or Y) are in the high-impedance state regardless of all other input conditions.

Moving data from two groups of registers to four common output buses is a common use of the CD74AC257, CD74ACT257 and CD74ACT258. The state of the Select input determines the particular register from which the data comes. The CD74AC257, CD74ACT257 and CD74ACT258 can also be used as function generators.

Ordering Information

PART	TEMP.			PKG.
NUMBER	RANGE (oC)	PACKAGE		NO.
CD74AC257E	0 to 70oC, -40 to 85,	16	Ld PDIP	E16.3
	-55 to 125
CD74ACT257E	0 to 70oC, -40 to 85,	16	Ld PDIP	E16.3
	-55 to 125
CD74ACT258E	0 to 70oC, -40 to 85,	16	Ld PDIP	E16.3
	-55 to 125
CD74AC257M	0 to 70oC, -40 to 85,	16	Ld SOIC	M16.15
	-55 to 125
CD74ACT257M	0 to 70oC, -40 to 85,	16 Ld SOIC		M16.15
	-55 to 125
CD74ACT258M	0 to 70oC, -40 to 85,	16 Ld SOIC		M16.15
	-55 to 125
NOTES:

1.When ordering, use the entire part number. Add the suffix 96 to obtain the variant in the tape and reel.

2.Wafer and die for this part number is available which meets all electrical specifications. Please contact your local sales office or Harris customer service for ordering information.

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

File Number 1955.1

	FAST™ is a Trademark of Fairchild Semiconductor.	1
	Copyright © Harris Corporation 1998

CD74AC257, CD74ACT257, CD74ACT258

Functional Diagram

							AC/ACT AC/ACT
					257				258
2
1I0							4	1Y
5										1Y
2I0
11
3I0							7	2Y
14										2Y
4I0
3
1I1							9	3Y
6										3Y
2I1
10
3I1							12
										4Y
13								4Y
4I1
1					15
S
OE

TRUTH TABLE

OUTPUT			SELECT				257	258
ENABLE			INPUT		DATA INPUTS		OUTPUTS	OUTPUTS
			S	I0		I1	Y
	OE								Y
	H		X	X		X	Z		Z
	L		L	L		X	L	H
	L		L	H		X	H		L
	L		H	X		L	L	H
	L		H	X		H	H		L

H = High level voltage, L = Low level voltage, Z = High impedance (off) state, X = Don’t Care

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CD74AC257, CD74ACT257, CD74ACT258

Absolute Maximum Ratings

DC Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . .	-0.5V to 6V
DC Input Diode Current, IIK	±20mA
For VI < -0.5V or VI > VCC + 0.5V . . . . . . . . . . . . . . . . . .
DC Output Diode Current, IOK	±50mA
For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . .
DC Output Source or Sink Current per Output Pin, IO	±50mA
For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . .
DC VCC or Ground Current, ICC or IGND (Note 3) . . . . . .	. . .±100mA

Thermal Information

Thermal Resistance (Typical, Note 5)	θJA (oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. ___
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. ___
Maximum Junction Temperature (Plastic Package) . . .	. . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . .	-65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . .	. . . . . . . 300oC

Operating Conditions

Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC

Supply Voltage Range, VCC (Note 4)

AC Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5V

ACT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V

DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to VCC

Input Rise and Fall Slew Rate, dt/dv

AC Types, 1.5V to 3V . . . . . . . . . . . . . . . . . . . . . . . . . 50ns (Max)

AC Types, 3.6V to 5.5V . . . . . . . . . . . . . . . . . . . . . . . . 20ns (Max)

ACT Types, 4.5V to 5.5V. . . . . . . . . . . . . . . . . . . . . . . 10ns (Max)

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

3.For up to 4 outputs per device, add ±25mA for each additional output.

4.Unless otherwise specified, all voltages are referenced to ground.

5.θJA is measured with the component mounted on an evaluation PC board in free air.

DC Electrical Specifications

		TEST					-40oC TO		-55oC TO
		CONDITIONS		VCC	25oC		85oC		125oC
PARAMETER	SYMBOL	VI (V)	IO (mA)	(V)	MIN	MAX	MIN	MAX	MIN	MAX	UNITS
AC TYPES
High Level Input Voltage	VIH	-	-	1.5	1.2	-	1.2	-	1.2	-	V
				3	2.1	-	2.1	-	2.1	-	V
				5.5	3.85	-	3.85	-	3.85	-	V
Low Level Input Voltage	VIL	-	-	1.5	-	0.3	-	0.3	-	0.3	V
				3	-	0.9	-	0.9	-	0.9	V
				5.5	-	1.65	-	1.65	-	1.65	V
High Level Output Voltage	VOH	VIH or VIL	-0.05	1.5	1.4	-	1.4	-	1.4	-	V
			-0.05	3	2.9	-	2.9	-	2.9	-	V
			-0.05	4.5	4.4	-	4.4	-	4.4	-	V
			-4	3	2.58	-	2.48	-	2.4	-	V
			-24	4.5	3.94	-	3.8	-	3.7	-	V
			-75	5.5	-	-	3.85	-	-	-	V
			(Note 6, 7)
			-50	5.5	-	-	-	-	3.85	-	V
			(Note 6, 7)

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