Texas Instruments CD74HCT257M96, CD74HCT257M, CD74HCT257E, CD74HC257M, CD74HC257E Datasheet

Data sheet acquired from Harris Semiconductor SCHS171

November 1997

CD74HC257,

CD74HCT257

High Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs

		Features	Description
		• Buffered Inputs	The Harris CD74HC257 and CD74HCT257 are quad 2-input
	[ /Title	• Typical Propagation Delay ( In to Output ) = 12ns at	multiplexers which select four bits of data from two sources
			under the control of a common Select Input (S). The Output
	(CD74	VCC = 5V, CL = 15pF, TA = 25oC	Enable input			is active LOW. When			is HIGH, all of
				(OE)				OE
	HC257	• Fanout (Over Temperature Range)	the outputs (1Y-4Y) are in the high impedance state regard-
	,	- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads	less of all other input conditions.
			Moving data from two groups of registers to four common
	CD74	- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
	HCT25	• Wide Operating Temperature Range . . . -55oC to 125oC	output busses is a common use of the 257. The state of the
			Select input determines the particular register from which
	7)	• Balanced Propagation Delay and Transition Times
			the data comes. It can also be used as a function generator.
	/Sub-	• Significant Power Reduction Compared to LSTTL	Ordering Information
	ject	Logic ICs
	(High	• HC Types
						TEMP. RANGE				PKG.
	Speed	- 2V to 6V Operation
			PART NUMBER			(oC)	PACKAGE			NO.
		- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
	CMOS
		at VCC = 5V	CD74HC257E			-55 to 125	16 Ld PDIP			E16.3
	Logic
		• HCT Types
			CD74HCT257E			-55 to 125	16 Ld PDIP			E16.3
	Quad	- 4.5V to 5.5V Operation
	2-Input	- Direct LSTTL Input Logic Compatibility,	CD74HC257M			-55 to 125	16 Ld SOIC			M16.15
	Multi-	VIL= 0.8V (Max), VIH = 2V (Min)
		- CMOS Input Compatibility, Il ≤ 1 A at VOL, VOH	CD74HCT257M			-55 to 125	16 Ld SOIC			M16.15
	plexer
			NOTES:
			1. When ordering, use the entire part number. Add the suffix 96 to
			obtain the variant in the tape and reel.
			2. Wafer or 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.

Pinout

CD74HC257, CD74HC257

(PDIP, SOIC)

TOP VIEW

S

1

16 VCC

1I0	2	15	OE
1I1	3	14	4I0
1Y	4	13	4I1
2I0	5	12	4Y
2I1	6	11	3I0
2Y	7	10	3I1
GND	8	9	3Y

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.	File Number 1650.1

Copyright © Harris Corporation 1997

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CD74HC257, CD74HCT257

Functional Diagram

15

OE

1

S

	4I1	13	P
				12	4Y
		14	N
	4I0
	3I1	10		9	3Y
		11
	3I0
		6
	2I1		3 CIRCUITS IDENTICAL TO CIRCUIT	7	2Y
		5
	2I0		IN ABOVE DASHED ENCLOSURE
		3
	1I1
		2		4	1Y
	1I0

TRUTH TABLE

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

NOTE:

H = High Voltage Level

L = Low Voltage Level

X = Don’t Care

Z = High Impedance, OFF State

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CD74HC257, CD74HCT257

Absolute Maximum Ratings

DC Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . .	-0.5V to 7V
DC Input Diode Current, IIK	±20mA
For VI < -0.5V or VI > VCC + 0.5V . . . . . . . . . . . . . . . . . .
DC Output Diode Current, IOK	±20mA
For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . .
DC Drain Current, per Output, IO	±35mA
For -0.5V < VO < VCC + 0.5V. . . . . . . . . . . . . . . . . . . . . .
DC Output Source or Sink Current per Output Pin, IO	±25mA
For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . .
DC VCC or Ground Current, ICC . . . . . . . . . . . . . . . . . . . . .	. . . .±70mA

Thermal Information
Thermal Resistance (Typical, Note 3)	θJA (oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 90
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 160
Maximum Junction Temperature . . . . . . . . . . . . . . . .	. . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . .	-65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . .	. . . . . . . 300oC
(SOIC - Lead Tips Only)

Operating Conditions

Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC Supply Voltage Range, VCC

HC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V HCT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V

DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to VCC Input Rise and Fall Time

2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000ns (Max) 4.5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500ns (Max)

6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400ns (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.

NOTE:

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

DC Electrical Specifications

		TEST				25oC		-40oC TO 85oC		-55oC TO 125oC
		CONDITIONS
PARAMETER	SYMBOL	VI (V)	IO (mA)	VCC (V)	MIN	TYP	MAX	MIN	MAX	MIN	MAX	UNITS
HC TYPES
High Level Input	VIH	-	-	2	1.5	-	-	1.5	-	1.5	-	V
Voltage
				4.5	3.15	-	-	3.15	-	3.15	-	V
				6	4.2	-	-	4.2	-	4.2	-	V
Low Level Input	VIL	-	-	2	-	-	0.5	-	0.5	-	0.5	V
Voltage
				4.5	-	-	1.35	-	1.35	-	1.35	V
				6	-	-	1.8	-	1.8	-	1.8	V
High Level Output	VOH	VIH or	-0.02	2	1.9	-	-	1.9	-	1.9	-	V
Voltage		VIL
			-0.02	4.5	4.4	-	-	4.4	-	4.4	-	V
CMOS Loads
			-0.02	6	5.9	-	-	5.9	-	5.9	-	V
High Level Output			-6	4.5	3.98	-	-	3.84	-	3.7	-	V
Voltage
			-7.8	6	5.48	-	-	5.34	-	5.2	-	V
TTL Loads
Low Level Output	VOL	VIH or	0.02	2	-	-	0.1	-	0.1	-	0.1	V
Voltage		VIL
			0.02	4.5	-	-	0.1	-	0.1	-	0.1	V
CMOS Loads
			0.02	6	-	-	0.1	-	0.1	-	0.1	V
Low Level Output			6	4.5	-	-	0.26	-	0.33	-	0.4	V
Voltage
			7.8	6	-	-	0.26	-	0.33	-	0.4	V
TTL Loads
Input Leakage	II	VCC or	-	6	-	-	±0.1	-	±1	-	±1	µA
Current		GND

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