JM38510/33701BEA - National Semiconductor

TL/F/9478

54F/74F138 1-of-8 Decoder/Demultiplexer

November 1994

54F/74F138

1-of-8 Decoder/Demultiplexer

General Description

The ’F138 is a high-speed 1-of-8 decoder/demultiplexer.

This device is ideally suited for high-speed bipolar memory

chip select address decoding. The multiple input enables

allow parallel expansion to a 1-of-24 decoder using just

three ’F138 devices or a 1-of-32 decoder using four ’F138

devices and one inverter.

Features

YDemultiplexing capability

YMultiple input enable for easy expansion

YActive LOW mutually exclusive outputs

YGuaranteed 4000V minimum ESD protection

Commercial Military Package Package Description

Number

74F138PC N16E 16-Lead (0.300×Wide) Molded Dual-In-Line

54F138DM (Note 2) J16A 16-Lead Ceramic Dual-In-Line

74F138SC (Note 1) M16A 16-Lead (0.150×Wide) Molded Small Outline, JEDEC

74F138SJ (Note 1) M16D 16-Lead (0.300×Wide) Molded Small Outline, EIAJ

54F138FM (Note 2) W16A 16-Lead Cerpack

54F138LM (Note 2) E20A 20-Lead Ceramic Leadless Chip Carrier, Type C

Note 1: Devices also available in 13×reel. Use suffix eSCX and SJX.

Note 2: Military grade device with environmental and burn-in processing. Use suffix eDMQB, FMQB and LMQB.

Logic Symbols

TL/F/9478–3

IEEE/IEC

TL/F/9478–6

Connection Diagrams

Pin Assignment for DIP,

SOIC and Flatpak

TL/F/9478–1

Pin Assignment

for LCC

TL/F/9478–2

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

C1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.

Unit Loading/Fan Out

54F/74F

Pin Names Description U.L. Input IIH/IIL

HIGH/LOW Output IOH/IOL

A0–A2Address Inputs 1.0/1.0 20 mA/b0.6 mA

E1,E

2Enable Inputs (Active LOW) 1.0/1.0 20 mA/b0.6 mA

E3Enable Input (Active HIGH) 1.0/1.0 20 mA/b0.6 mA

O0–O7Outputs (Active LOW) 50/33.3 b1 mA/20 mA

Functional Description

The ’F138 high-speed 1-of-8 decoder/demultiplexer ac-

cepts three binary weighted inputs (A0, A1, A2) and, when

enabled, provides eight mutually exclusive active LOW out-

puts (O0–O7). The ’F138 features three Enable inputs, two

active LOW (E1, E2) and one active HIGH (E3). All outputs

will be HIGH unless E1and E2are LOW and E3is HIGH.

This multiple enable function allows easy parallel expansion

of the device to a 1-of-32 (5 lines to 32 lines) decoder with

just four ’F138 devices and one inverter (See

Figure 1

). The

’F138 can be used as an 8-output demultiplexer by using

one of the active LOW Enable inputs as the data input and

the other Enable inputs as strobes. The Enable inputs which

are not used must be permanently tied to their appropriate

active HIGH or active LOW state.

Truth Table

Inputs Outputs

E1E2E3A0A1A2O0O1O2O3O4O5O6O7

HXXXXXHH H HHHHH

XHXXXXHH H HHHHH

XXLXXXHH H HHHHH

LLHL L L L H H HHHHH

LLHHL LHL H HHHHH

LLHLHLHH L HHHHH

LLHHHLHH H L HHHH

LLHL LHHH H HL HHH

LLHHLHHHHHHLHH

LLHLHHHH H HHH LH

LLHHHHHH H HHHHL

HIGH Voltage Level

LeLOW Voltage Level

XeImmaterial

Logic Diagram

TL/F/9478–4

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales

Office/Distributors for availability and specifications.

Storage Temperature b65§Ctoa

150§C

Ambient Temperature under Bias b55§Ctoa

125§C

Junction Temperature under Bias b55§Ctoa

175§C

Plastic b55§Ctoa

150§C

VCC Pin Potential to

Ground Pin b0.5V to a7.0V

Input Voltage (Note 2) b0.5V to a7.0V

Input Current (Note 2) b30 mA to a5.0 mA

Voltage Applied to Output

in HIGH State (with VCC e0V)

Standard Output b0.5V to VCC

TRI-STATEÉOutput b0.5V to a5.5V

Current Applied to Output

in LOW State (Max) twice the rated IOL (mA)

ESD Last Passing Voltage (Min) 4000V

Note 1: Absolute maximum ratings are values beyond which the device may

be damaged or have its useful life impaired. Functional operation under

these conditions is not implied.

Note 2: Either voltage limit or current limit is sufficient to protect inputs.

Recommended Operating

Conditions

Free Air Ambient Temperature

Military b55§Ctoa

125§C

Commercial 0§Ctoa

70§C

Supply Voltage

Military a4.5V to a5.5V

Commercial a4.5V to a5.5V

DC Electrical Characteristics

Symbol Parameter 54F/74F Units VCC Conditions

Min Typ Max

VIH Input HIGH Voltage 2.0 V Recognized as a HIGH Signal

VIL Input LOW Voltage 0.8 V Recognized as a LOW Signal

VCD Input Clamp Diode Voltage b1.2 V Min IIN eb

18 mA

VOH Output HIGH 54F 10% VCC 2.5 IOH eb

1mA

Voltage 74F 10% VCC 2.5 V Min IOH eb

1mA

74F 5% VCC 2.7 IOH eb

1mA

OL Output LOW 54F 10% VCC 0.5 V Min IOL e20 mA

Voltage 74F 10% VCC 0.5 IOL e20 mA

IIH Input HIGH 54F 20.0

mA Max VIN e2.7V

Current 74F 5.0

IBVI Input HIGH Current 54F 100

mA Max VIN e7.0V

Breakdown Test 74F 7.0

ICEX Output HIGH 54F 250

mA Max VOUT eVCC

Leakage Current 74F 50

VID Input Leakage 74F 4.75 V 0.0 IID e1.9 mA

Test All Other Pins Grounded

IOD Output Leakage 74F 3.75 mA 0.0 VIOD e150 mV

Circuit Current All Other Pins Grounded

IIL Input LOW Current b0.6 mA Max VIN e0.5V

IOS Output Short-Circuit Current b60 b150 mA Max VOUT e0V

ICCH Power Supply Current 13 20 mA Max VOeHIGH

ICCL Power Supply Current 13 20 mA Max VOeLOW

AC Electrical Characteristics

74F 54F 74F

TAea

25§CTA,V

CC eMil TA,V

CC eCom Fig.

Symbol Parameter VCC ea

5.0V CLe50 pF CLe50 pF Units No.

CLe50 pF

Min Typ Max Min Max Min Max

tPLH Propagation Delay 3.5 5.6 7.5 3.0 12.0 3.5 8.5 ns F–3

tPHL Anto On4.0 6.1 8.0 4.0 9.5 4.0 9.0

tPLH Propagation Delay 3.5 5.4 7.0 3.0 11.0 3.5 8.0 ns F–4

tPHL E1or E2to On3.0 5.3 7.0 3.0 8.0 3.0 7.5

tPLH Propagation Delay 4.0 6.2 8.0 3.5 12.5 4.0 9.0 ns F–4

tPHL E3to On3.5 5.6 7.5 3.5 8.5 3.5 8.5

TL/F/9478–5

FIGURE 1. Expansion to 1-of-32 Decoding

Ordering Information

The device number is used to form part of a simplified purchasing code where the package type and temperature range are

defined as follows:

74F 138 S C X

Temperature Range Family Special Variations

74FeCommercial QB eMilitary grade device with

54FeMilitary environmental and burn-in

processing

Device Type XeDevices shipped in 13×reel

Package Code Temperature Range

PePlastic DIP CeCommercial (0§Ctoa

70§C)

DeCeramic DIP MeMilitary (b55§Ctoa

125§C)

FeFlatpak

LeLeadless Chip Carrier (LCC)

SeSmall Outline SOIC JEDEC

SJ eSmall Outline SOIC EIAJ

Physical Dimensions inches (millimeters)

20-Lead Ceramic Leadless Chip Carrier (L)

NS Package Number E20A

Physical Dimensions inches (millimeters) (Continued)

16-Lead Ceramic Dual-In-Line Package (D)

NS Package Number J16A

16-Lead (0.150×Wide) Molded Small Outline Package, JEDEC (S)

NS Package Number M16A

Physical Dimensions inches (millimeters) (Continued)

16-Lead (0.300×Wide) Molded Small Outline Package, EIAJ (SJ)

NS Package Number M16D

16-Lead (0.300×Wide) Molded Dual-In-Line Package (P)

NS Package Number N16E

54F/74F138 1-of-8 Decoder/Demultiplexer

Physical Dimensions inches (millimeters) (Continued)

16-Lead Ceramic Flatpak (F)

NS Package Number W16A

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