MM74HCT138MTCX - ON SEMICONDUCTOR

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February 1984

Revised February 1999

MM74HCT138 3-to-8 Line Decoder

MM74HCT138

3-to-8 Line Decoder

General Descript ion

The MM74HCT138 decoder utilizes advanced silicon-gate

CMOS techno logy, and are well suited to memor y addr ess

decodin g or data rou ting app lications. Both c ircuits feature

high noise immunity and low power consumption usually

associated with CMOS circuitry, yet have speeds compara-

ble to low power Schottky TTL logic.

The MM74 HCT138 have 3 binar y select inputs (A, B, and

C). If the device is enabled these inputs determine which

one of the eight normally HIGH outputs will go LOW. Two

active LOW and one active HIGH enables (G1, G2A and

G2B) are provided to ease the cascading decoders.

The decoders’ output can drive 10 low power Schottky TTL

equivalent l oads and are functi onally a nd pin equ ivalent to

the 74L S138 . All inputs a re p rotecte d from dam age d ue to

static discharge by diodes to VCC and ground.

MM74HC T device s are intended to i nterface between TTL

and NMOS components and standard CMOS devices.

These parts are also plug-in replacements for LS-TTL

devices and can be u sed to reduce p ower consumption in

existing designs.

Features

■TTL input compatible

■Typical propagation delay: 20 ns

■Low quiescent current: 80 µA maximum (74HCT S eries)

■Low input current: 1 µA maximum

■Fanout of 10 LS-TTL loads

Ordering Code:

Devices also available in Tap e and Reel. Specify by appen ding the suffix let t er “X” to the ordering code.

Connection Diagram

Pin Assignments for DIP, SOIC, SOP and TSSOP

Order Number Package Number Package Description

MM74HCT138M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow

MM74HCT138SJ M16D 16-Lead Small Outline Packa ge (SOP), EIAJ TYPE II, 5.3mm Wide

MM74HCT138M T C MTC16 16-Lead Thin Shrink Small Outli ne Package ( TSSOP), JEDEC MO-153, 4.4mm Wide

MM74HCT138N N16E 16-Lead Plastic D ual-In-Line Package (PDIP), JE DEC MS-001, 0.300 ” Wide

www.fairchildsemi.com 2

MM74HCT138

Truth Table

H = HIGH Level

L = LO W Level

X = Don’t Care

Note 1: G2 = G2A + G2B

Logic Diagra m

Inputs Outputs

Enable Select

G1 G2

(Note 1) C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

X H XXXHHHHHHHH

L X XXXHHHHHHHH

H L LLLLHHHHHHH

H L LLHHLHHHHHH

H L LHLHHLHHHHH

H L LHHHHHLHHHH

H L HLLHHHHLHHH

H L HLHHHHHHLHH

H L HHLHHHHHHLH

H L HHHHHHHHHHL

3 www.fairchildsemi.com

MM74HCT138

Absolute Maximum Ratings(Note 2)

(Note 3) Recommended Operating

Conditions

Note 2: A bsolute M aximum Ra tings are those valu es beyond wh ich dam-

age to the device may occur.

Note 3: Unless ot herwise spe c if ied all voltages are referenced to gro und.

Note 4: Power Diss ipation tem perature derating — plastic “ N” package: −

12 mW/°C from 65°C to 85°C.

DC Electrical Characteristics

VCC = 5V ±10% (unless otherwise specified)

Note 5: Th is is m eas ured per input pin. All ot her inputs are held at VCC or ground.

Supply Volta ge (V CC)−0.5 to +7.0V

DC Input Voltage (VIN)−1.5 to VCC +1.5V

DC Output Voltage (VOUT)−0.5 to VCC +0.5V

Clamp Diode Current (IIK, IOK)±20 mA

DC Output Current, per pin (IOUT)±25 mA

DC VCC or GND Current, per pin (ICC)±50 mA

Storage Temperature Range (TSTG)−65°C to +150°C

Power Dissipation (PD)

(Note 4) 600 mW

S.O. Package only 500 mW

Lead Temperature (TL)

(Soldering 10 seconds ) 260 °C

Min Max Units

Supply Voltage (VCC)4.55.5V

DC Input or Output Volta ge

(VIN, VOUT)0V

CC V

Operating Temperature Range (TA)−40 +85 °C

Input Rise or Fall Times

(tr, tf) 500 ns

Symbol Parameter Conditions TA = 25°CT

A = −40 to 85°CT

A = −55 to 125°CUnits

Typ Guaranteed Limits

VIH Minimum HIGH Level 2.0 2.0 2.0 V

Input Voltage

VIL Maximum LOW Level 0.8 0.8 0 .8 V

Input Voltage

VOH Minimum HIGH Level VIN = VIH or VIL

Output Voltage |IOUT| = 20 µAV

CC VCC− 0.1 VCC− 0.1 VCC− 0.1 V

|IOUT| = 4.0 mA, VCC = 4.5V 4.2 3.98 3.84 3.7 V

|IOUT| = 4.8 mA, VCC = 5.5V 5.2 4.98 4.84 4.7 V

VOL Maximum LOW Level VIN = VIH or VIL

Voltage |IOUT| = 20 µA 0 0.1 0.1 0.1 V

|IOUT| = 4.0 mA, VCC = 4.5V 0.2 0.26 0.33 0.4 V

|IOUT| = 4.8 mA, VCC = 5.5V 0.2 0.26 0.33 0.4 V

IIN Maximum Input VIN = VCC or GND, ±0.1 ±1.0 ±1.0 µA

Current VIH or VIL

ICC Maximum Quiescent VIN = VCC or GND 8.0 80 160 µA

Supply Current IOUT = 0 µA

VIN = 2.4V or 0.5V (Note 5) 0.3 0.4 0.5 mA

www.fairchildsemi.com 4

MM74HCT138

AC Electrical Character istics

TA = 25°C, VCC = 5.0V, tr = tf = 6 ns, CL = 15 pF (unless otherwise specified)

AC Electrical Character istics

VCC = 5V ± 10%, CL = 50 pF, tr = tf = 6 ns (unless otherwise specified)

Note 6: CPD deter mines the no load dyna m ic powe r c onsumption, PD = CPD VCC2f + ICC VCC, and the no loa d dynamic cu rrent consu m pt ion,

IS = CPD VCC f + ICC.

Symbol Parameter Conditions Typ Guaranteed Units

Limit

tPHL Maximum Propagation Delay, A, B, or C to Output 20 35 ns

tPLH Maximum Propagation Delay, A, B, or C to Output 13 25 ns

tPHL Maximum Propagation Delay, G1 to Y Output 14 25 ns

tPLH Maximum Propagation Delay, G1 to Y Output 13 25 ns

tPHL Maximum Propagation Delay, G2A or G2B to Y Output 17 30 ns

tPLH Maximum Propagation Delay, G2A or G2B to Y Output 13 25 ns

Symbol Parameter Conditions TA = 25°CT

A = −40 to 85°CT

A = −55 to 125°CUnits

Typ Guaranteed Limits

tPHL Maximum Propagation Delay 24 40 50 60 ns

A, B, or C to Output

tPLH Maximum Propagation Delay 18 30 38 45 ns

A, B, or C to Output

tPHL Maximum Propagation Delay 17 30 38 45 ns

G1 to Y Output

tPLH Maximum Propagation Delay 20 30 38 45 ns

G1 to Y Output

tPHL Maximum Propagation Delay 23 35 43 52 ns

G2A or G2B to Y Output

tPLH Maximum Propagation Delay 18 30 38 45 ns

G2A or G2B to Y Output

tTHL, tTLH Maximum Output 15 19 22 ns

Rise and Fa ll Time

CIN Input Capacitance 5 10 10 pF

CPD Power Dissipation 55 pF

Capacitance (Note 6)

5 www.fairchildsemi.com

MM74HCT138

Physical Dimensions inches (millimeters) unless otherwise noted

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow

Package Number M16A

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

Package Number M16D

www.fairchildsemi.com 6

MM74HCT138

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Package Number MTC16

F airchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time w ithout notice to change said circuitry and specifications.

MM74HCT138 3-to-8 Line Decoder

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD

SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or system s a re devices or syste ms

which, (a) are intended for surgical implant into the

body, or (b) support or sustain life, and (c) whose failure

to perform when properly used in accordance with

inst ructions for use provided in the labeling, can be rea-

sonably expected to result in a significant injur y to the

user.

2. A cr itical c ompon ent in any com ponent of a li fe support

device or system whose failure to perform can be rea-

sonably expected to cause th e failure of the li fe suppor t

device or system, or to affect its safety or effectiveness.

www.fairchildsemi.com

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

Package Number N16E

www.onsemi.com

ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.

ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent

coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.

ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,

regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or

specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer

application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not

designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification

in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized

application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and

expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such

claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This

literature is subject to all applicable copyright laws and is not for resale in any manner.

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