74ACT138SCX - National Semiconductor

TL/F/9925

54AC/74AC138 #54ACT/74ACT138 1-of-8 Decoder/Demultiplexer

March 1993

54AC/74AC138 #54ACT/74ACT138

1-of-8 Decoder/Demultiplexer

General Description

The ’AC/’ACT138 is a high-speed 1-of-8 decoder/demulti-

plexer. 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 ’AC/’ACT138 devices or a 1-of-32 decoder using

four ’AC/’ACT138 devices and one inverter.

Features

YICC reduced by 50%

YDemultiplexing capability

YMultiple input enable for easy expansion

YActive LOW mutually exclusive outputs

YOutputs source/sink 24 mA

Y’ACT138 has TTL-compatible inputs

YStandard Military Drawing (SMD)

Ð ’AC138: 5962-87622

Ð ’ACT138: 5962-87554

Logic Symbols

TL/F/9925–1

IEEE/IEC

TL/F/9925–7

Connection Diagrams

Pin Assignment

for DIP, Flatpak and SOIC

TL/F/9925–2

Pin Assignment

for LCC

TL/F/9925–3

Pin Names Description

A0–A2Address Inputs

E1–E2Enable Inputs

E3Enable Input

O0–O7Outputs

FACTTM is a trademark of National Semiconductor Corporation.

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

Functional Description

The ’AC/’ACT138 high-speed 1-of-8 decoder/demultiplexer

accepts three binary weighted inputs (A0,A

) and, when

enabled, provides eight mutually exclusive active-LOW out-

puts (O0–O7). The ’AC/’ACT138 features three Enable in-

puts, two active-LOW (E1,E

) and one active-HIGH (E3). All

outputs will be HIGH unless E1and E2are LOW and E3is

HIGH. This multiple enable function allows easy parallel ex-

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

decoder with just four ’AC/’ACT138 devices and one invert-

er (see

Figure 1

). The ’AC/’ACT138 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 per-

manently tied to their appropriate active-HIGH or active-

LOW state.

Truth Table

Inputs Outputs

E1E2E3A0A1A2O0O1O2O3O4O5O6O7

HXXXXXHHHHHHHH

XHXXXXHHHHHHHH

XXLXXXHHHHHHHH

LLHL L L LHHHHHHH

LLHHL LHLHHHHHH

LLHLHLHHLHHHHH

LLHHHLHHHLHHHH

LLHL LHHHHHLHHH

LLHHLHHHHHHLHH

LLHLHHHHHHHHLH

LLHHHHHHHHHHHL

HIGH Voltage Level

LeLOW Voltage Level

XeImmaterial

Logic Diagram

TL/F/9925–4

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

TL/F/9925–5

FIGURE 1. Expansion to 1-of-32 Decoding

Absolute Maximum Rating (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales

Office/Distributors for availability and specifications.

Supply Voltage (VCC)b0.5V to a7.0V

DC Input Diode Current (IIK)

VIeb

0.5V b20 mA

VIeVCC a0.5V a20 mA

DC Input Voltage (VI)b0.5V to VCC a0.5V

DC Output Diode Current (IOK)

VOeb

0.5V b20 mA

VOeVCC a0.5V a20 mA

DC Output Voltage (VO)b0.5V to VCC a0.5V

DC Output Source

or Sink Current (IO)g50 mA

DC VCC or Ground Current

per Output Pin (ICC or IGND)g50 mA

Storage Temperature (TSTG)b65§Ctoa

150§C

Junction Temperature (TJ)

CDIP 175§C

PDIP 140§C

Note 1: Absolute maximum ratings are those values beyond which damage

to the device may occur. The databook specifications should be met, without

exception, to ensure that the system design is reliable over its power supply,

temperature, and output/input loading variables. National does not recom-

mend operation of FACTTM circuits outside databook specifications.

Recommended Operating

Conditions

Supply Voltage (VCC)

’AC 2.0V to 6.0V

’ACT 4.5V to 5.5V

Input Voltage (VI) 0VtoV

Output Voltage (VO) 0VtoV

Operating Temperature (TA)

74AC/ACT b40§Ctoa

85§C

54AC/ACT b55§Ctoa

125§C

Minimum Input Edge Rate (DV/Dt)

’AC Devices

VIN from 30% to 70% of VCC

VCC @3.3V, 4.5V, 5.5V 125 mV/ns

Minimum Input Edge Rate (DV/Dt)

’ACT Devices

VIN from 0.8V to 2.0V

VCC @4.5V, 5.5V 125 mV/ns

DC Characteristics for ’AC Family Devices

74AC 54AC 74AC

Symbol Parameter VCC TAea

25§CTAeTAeUnits Conditions

(V) b55§Ctoa

125§Cb40§Ctoa

85§C

Typ Guaranteed Limits

VIH Minimum High Level 3.0 1.5 2.1 2.1 2.1 VOUT e0.1V

Input Voltage 4.5 2.25 3.15 3.15 3.15 V or VCC b0.1V

5.5 2.75 3.85 3.85 3.85

VIL Maximum Low Level 3.0 1.5 0.9 0.9 0.9 VOUT e0.1V

Input Voltage 4.5 2.25 1.35 1.35 1.35 V or VCC b0.1V

5.5 2.75 1.65 1.65 1.65

VOH Minimum High Level 3.0 2.99 2.9 2.9 2.9 IOUT eb

50 mA

Output Voltage 4.5 4.49 4.4 4.4 4.4 V

5.5 5.49 5.4 5.4 5.4

*VIN eVIL or VIH

3.0 2.56 2.4 2.46 b12 mA

4.5 3.86 3.7 3.76 V IOH b24 mA

5.5 4.86 4.7 4.76 b24 mA

VOL Maximum Low Level 3.0 0.002 0.1 0.1 0.1 IOUT e50 mA

Output Voltage 4.5 0.001 0.1 0.1 0.1 V

5.5 0.001 0.1 0.1 0.1

*VIN eVIL or VIH

3.0 0.36 0.50 0.44 12 mA

4.5 0.36 0.50 0.44 V IOL 24 mA

5.5 0.36 0.50 0.44 24 mA

IIN Maximum Input 5.5 g0.1 g1.0 g1.0 mAVIeVCC, GND

Leakage Current

*All outputs loaded; thresholds on input associated with output under test.

DC Characteristics for ’AC Family Devices (Continued)

74AC 54AC 74AC

Symbol Parameter VCC TAea

25§CTAeTAeUnits Conditions

(V) b55§Ctoa

125§Cb40§Ctoa

85§C

Typ Guaranteed Limits

IOLD ²Minimum Dynamic 5.5 50 75 mA VOLD e1.65V Max

IOHD Output Current 5.5 b50 b75 mA VOHD e3.85V Min

ICC Maximum Quiescent 5.5 4.0 80.0 40.0 mAVIN eVCC

Supply Current or GND

²Maximum test duration 2.0 ms, one output loaded at a time.

Note: IIN and ICC @3.0V are guaranteed to be less than or equal to the respective limit @5.5V VCC.

ICC for 54AC @25§C is identical to 74AC @25§C.

DC Characteristics for ’ACT Family Devices

74ACT 54ACT 74ACT

Symbol Parameter VCC TAea

25§CTAeTAeUnits Conditions

(V) b55§Ctoa

125§Cb40§Ctoa

85§C

Typ Guaranteed Limits

VIH Minimum High Level 4.5 1.5 2.0 2.0 2.0 VVOUT e0.1V

Input Voltage 5.5 1.5 2.0 2.0 2.0 or VCC b0.1V

VIL Maximum Low Level 4.5 1.5 0.8 0.8 0.8 VVOUT e0.1V

Input Voltage 5.5 1.5 0.8 0.8 0.8 or VCC b0.1V

VOH Minimum High Level 4.5 4.49 4.4 4.4 4.4 VIOUT eb

50 mA

Output Voltage 5.5 5.49 5.4 5.4 5.4

*VIN eVIL or VIH

4.5 3.86 3.70 3.76 VI

b24 mA

5.5 4.86 4.70 4.76 b24 mA

VOL Maximum Low Level 4.5 0.001 0.1 0.1 0.1 VIOUT e50 mA

Output Voltage 5.5 0.001 0.1 0.1 0.1

*VIN eVIL or VIH

4.5 0.36 0.50 0.44 VI

24 mA

5.5 0.36 0.50 0.44 24 mA

IIN Maximum Input 5.5 g0.1 g1.0 g1.0 mAV

CC, GND

Leakage Current

ICCT Maximum 5.5 0.6 1.6 1.5 mA VIeVCC b2.1V

ICC/Input

IOLD ²Minimum Dynamic 5.5 50 75 mA VOLD e1.65V Max

IOHD Output Current 5.5 b50 b75 mA VOHD e3.85V Min

ICC Maximum Quiescent 5.5 4.0 80.0 40.0 mAVIN eVCC

Supply Current or GND

*All outputs loaded; thresholds on input associated with output under test.

²Maximum test duration 2.0 ms, one output loaded at a time.

Note: ICC for 54ACT @25§C is identical to 74ACT @25§C.

AC Electrical Characteristics

74AC 54AC 74AC

VCC*TAea

25§CTAeb

55§CT

40§C

Symbol Parameter (V) CLe50 pF to a125§Cto

85§C Units

CLe50 pF CLe50 pF

Min Typ Max Min Max Min Max

tPLH Propagation Delay 3.3 1.5 8.5 13.0 1.0 16.0 1.5 15.0 ns

Anto On5.0 1.5 6.5 9.5 1.5 12.0 1.5 10.5

tPHL Propagation Delay 3.3 1.5 8.0 12.5 1.0 15.0 1.5 14.0 ns

Anto On5.0 1.5 6.0 9.0 1.5 11.5 1.5 10.5

tPLH Propagation Delay 3.3 1.5 11.0 15.0 1.0 16.5 1.5 16.0 ns

E1or E2to On5.0 1.5 8.0 11.0 1.5 13.0 1.5 12.0

tPHL Propagation Delay 3.3 1.5 9.5 13.5 1.0 15.5 1.5 15.0 ns

E1or E2to On5.0 1.5 7.0 9.5 1.5 12.0 1.5 10.5

tPLH Propagation Delay 3.3 1.5 11.0 15.5 1.0 17.0 1.5 16.5 ns

E3to On5.0 1.5 8.0 11.0 1.5 13.5 1.5 12.5

tPHL Propagation Delay 3.3 1.5 8.5 13.0 1.0 15.0 1.5 14.0 ns

E3to On5.0 1.5 6.0 8.0 1.5 11.0 1.0 9.5

*Voltage Range 3.3 is 3.3V g0.3V

Voltage Range 5.0 is 5.0V g0.5V

AC Electrical Characteristics

74ACT 54ACT 74ACT

VCC*TAea

25§CTAeb

55§CT

40§C

Symbol Parameter (V) CLe50 pF to a125§Cto

85§C Units

CLe50 pF CLe50 pF

Min Typ Max Min Max Min Max

tPLH Propagation Delay 5.0 1.5 7.0 10.5 1.5 12.5 1.5 11.5 ns

Anto On

tPHL Propagation Delay 5.0 1.5 6.5 10.5 1.5 12.5 1.5 11.5 ns

Anto On

tPLH Propagation Delay 5.0 2.5 8.0 11.5 1.5 13.5 2.0 12.5 ns

E1or E2to On

tPHL Propagation Delay 5.0 2.0 7.5 11.5 1.5 12.5 2.0 12.5 ns

E1or E2to On

tPLH Propagation Delay 5.0 2.5 8.0 12.0 1.5 14.0 2.0 13.0 ns

E3to On

tPHL Propagation Delay 5.0 2.0 6.5 10.5 1.5 12.0 1.5 11.5 ns

E3to On

*Voltage Range 5.0 is 5.0V g0.5V

Capacitance

Symbol Parameter Typ Units Conditions

CIN Input Capacitance 4.5 pF VCC eOPEN

CPD Power Dissipation 60.0 pF VCC e5.0V

Capacitance

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:

74ACT 138 P C QR

Temperature Range Family Special Variations

74AC eCommercial X eDevices shipped in 13×reels

54AC eMilitary QR eCommercial grade device

74ACT eCommercial TTL-Compatible with burn-in

54ACT eMilitary TTL-Compatible QB eMilitary grade device with

environmental and burn-in

Device Type processing shipped in tubes

Package Code Temperature Range

PePlastic DIP CeCommercial (b40§Ctoa

85§C)

DeCeramic DIP MeMilitary (b55§Ctoa

125§C)

FeFlatpak

LeLeadless Ceramic Chip Carrier (LCC)

SeSmall Outline (SOIC)

Physical Dimensions inches (millimeters)

20 Terminal Ceramic Leadless Chip Carrier (L)

NS Package Number E20A

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

NS Package Number J16A

Physical Dimensions inches (millimeters) (Continued)

16 Lead Small Outline Integrated Circuit (S)

NS Package Number M16A

16 Lead Plastic Dual-In-Line Package (P)

NS Package Number N16E

54AC/74AC138 #54ACT/74ACT138 1-of-8 Decoder/Demultiplexer

Physical Dimensions inches (millimeters) (Continued)

16 Lead Ceramic Flatpak (F)

NS Package Number W16A

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with instructions for use provided in the labeling, can effectiveness.

be reasonably expected to result in a significant injury

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