Texas Instruments CD74HCT238M, CD74HCT238E, CD74HCT138M96, CD74HCT138M, CD74HCT138E Datasheet

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Texas Instruments CD74HCT238M, CD74HCT238E, CD74HCT138M96, CD74HCT138M, CD74HCT138E Datasheet

						CD74HC138, CD74HCT138,
	Data sheet acquired from Harris Semiconductor					CD74HC238, CD74HCT238
	SCHS147A					High Speed CMOS Logic 3-to-8 Line Decoder/
						High Speed CMOS Logic 3-to-8 Line Decoder/
	October 1997 - Revised February 1999					Demultiplexer Inverting and Non-Inverting

	Features
	•	Select One Of Eight Data Outputs
[ /Title		Active Low for 138, Active High for 238
[ /Title	•	l/O Port or Memory Selector
(CD74	•	l/O Port or Memory Selector
(CD74	•	Three Enable Inputs to Simplify Cascading
HC138	•	Three Enable Inputs to Simplify Cascading
HC138
,	•	Typical Propagation Delay of 13ns at VCC = 5V,
CD74		C	L	= 15pF, T = 25oC
CD74			L		A
HCT13	•	Fanout (Over Temperature Range)
8,		- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
CD74		-	Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
HC238	•	Wide Operating Temperature Range . . . -55oC to 125oC
,	•	Balanced Propagation Delay and Transition Times
CD74	•	Signiﬁcant Power Reduction Compared to LSTTL
HCT23	•	Signiﬁcant Power Reduction Compared to LSTTL
HCT23		Logic ICs
8)	• HC Types
/Sub-	• HC Types
/Sub-		-	2V to 6V Operation
ject		-	2V to 6V Operation
ject		- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
(High		- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
(High			at VCC = 5V
Speed	• HCT Types

-4.5V to 5.5V Operation

-Direct LSTTL Input Logic Compatibility, VIL= 0.8V (Max), VIH = 2V (Min)

-CMOS Input Compatibility, Il ≤ 1μA at VOL, VOH

Pinout

CD74HC138, CD74HCT138, CD74HC238, CD74HCT238

		(PDIP, SOIC)
		TOP VIEW
A0	1	16	VCC
A1	2	15	Y0 (Y0)
A2	3	14	Y1 (Y1)
E1	4	13	Y2 (Y2)

E2	5	12	Y3 (Y3)
E3	6	11	Y4 (Y4)

(Y7) Y7	7	10	Y5 (Y5)
GND	8	9	Y6 (Y6)

Signal names in parentheses are for ’HC238 and ’HCT238.

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

CD74HC138, CD74HCT138, CD74HC238, CD74HCT238

Description

The Harris CD74HC138, CD74HC238 and CD74HCT138, CD74HCT238 are high speed silicon gate CMOS decoders well suited to memory address decoding or data routing applications. Both circuits feature low power consumption usually associated with CMOS circuitry, yet have speeds comparable to low power Schottky TTL logic. Both circuits have three binary select inputs (A0, A1 and A2). If the device is enabled, these inputs determine which one of the eight normally high outputs of the HC/HCT138 series will go low or which of the normally low outputs of the HC/HCT238 series will go high.

Two active low and one active high enables (E1, E2, and E3) are provided to ease the cascading of decoders. The decoder’s 8 outputs can drive 10 low power Schottky TTL equivalent loads.

Ordering Information

	TEMP. RANGE (oC)		PKG.
PART NUMBER	TEMP. RANGE (oC)	PACKAGE	NO.
CD74HC138E	-55 to 125	16 Ld PDIP	E16.3

Ordering Information

	TEMP. RANGE (oC)		PKG.
PART NUMBER	TEMP. RANGE (oC)	PACKAGE	NO.
CD74HCT138E	-55 to 125	16 Ld PDIP	E16.3

CD74HC238E	-55 to 125	16 Ld PDIP	E16.3

CD74HCT238E	-55 to 125	16 Ld PDIP	E16.3

CD74HC138M	-55 to 125	16 Ld SOIC	M16.15

CD74HCT138M	-55 to 125	16 Ld SOIC	M16.15

CD74HC238M	-55 to 125	16 Ld SOIC	M16.15

CD74HCT238M	-55 to 125	16 Ld SOIC	M16.15

CD74HC138SM	-55 to 125	16 Ld SSOP	M16.209

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.

Functional Diagram

		HC/HCT HC/HCT
	238			138
1		15

A0			Y0		Y0

2		14	Y1
A1					Y1

3		13	Y2
A2					Y2
		12
			Y3
4					Y3
		11
			Y4
E1					Y4

5		10	Y5
E2					Y5

6		9
E3			Y6		Y6
		7
			Y7
					Y7

TRUTH TABLE CD74HC138, CD74HCT138

INPUTS

ENABLE

ADDRESS

OUTPUTS

CD74HC138, CD74HCT138, CD74HC238, CD74HCT238

TRUTH TABLE CD74HC138, CD74HCT138

INPUTS

ENABLE

ADDRESS

OUTPUTS

NOTE: H = High Voltage Level, L = Low Voltage Level, X = Don’t Care

TRUTH TABLE CD74HC238, CD74HCT238

INPUTS

ENABLE

ADDRESS

OUTPUTS

NOTE: H = High Voltage Level, L = Low Voltage Level, X = Don’t Care

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