Datasheet IDT54FCT138D, IDT54FCT138DB, IDT54FCT138E, IDT54FCT138EB, IDT54FCT138L Datasheet (Integrated Device Technology Inc)



Integrated Device Technology, Inc.

FAST CMOS
1-OF-8 DECODER
WITH ENABLE

IDT54/74FCT138
IDT54/74FCT138A
IDT54/74FCT138C

FEATURES:

• IDT54/74FCT138 equivalent to FAST speed

• IDT54/74FCT138A 35% faster than FAST

• IDT54/74FCT138C 40% faster than FAST

• Equivalent to FAST speeds output drive over full tem­perature and voltage supply extremes

•IOL = 48mA (commercial) and 32mA (military)

• CMOS power levels (1mW typ. static)

• TTL input and output level compatible

• CMOS output level compatible

• Substantially lower input current levels than FAST
(5µA max.)

DESCRIPTION:

The IDT54/74FCT138/A/C are 1-of-8 decoders built using
an advanced dual metal CMOS technology. The IDT54/
74FCT138/A/C accept three binary weighted inputs (A0, A1,
A2) and, when enabled, provide eight mutually exclusive
active LOW outputs (

feature three enable inputs, two active LOW (
active HIGH (E3). All outputs will be HIGH unless
are LOW and E3 is 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 IDT54/74FCT138/A/C devices
and one inverter.

O

0 - O7). The IDT54/74FCT138/A/C

• JEDEC standard pinout for DIP and LCC

• Product available in Radiation Tolerant and Radiation
Enhanced versions

• Military product compliant to MIL-STD-883, Class B

• Standard Military Drawing # 5962-87654 is listed on this
function. Refer to section 2.

FUNCTIONAL BLOCK DIAGRAM PIN CONFIGURATIONS

E1 E2

E3A0A1A2

E
E

O

GND

1

A

0

2

A

1

A

2

E

1
2
3
7

3
4
5
6
7
8

P16-1,

D16-1,

SO16-1

E16-1

E

1, E2) and one

E

1 and E2

16

Vcc

15

O

0

14

O

1

13

O

2

12

O

&

11
10

9

3

O

4
5

O
O

6

DIP/SOIC/CERPACK

TOP VIEW

1

NC

20 19

NC

Vcc

0

O

18

O1

17

O

16
15
14

2

NC
O3

O

4

O5O6

2581 drw 01

O0O1O2O3O4O5O6O7

2581 drw 02

INDEX

A2

E1

NC

2

E
E3

A1

32

4
5
6
7
8

10 11 12 13

9

7

O

A0

L20-2

GND

LCC

TOP VIEW

The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FAST is a trademark of National Semiconductor Co.

MILITARY AND COMMERCIAL TEMPERATURE RANGES MAY 1992

1992 Integrated Device Technology, Inc. 7.3 DSC-4625/3

1

IDT54/74FCT138/A/C
FAST CMOS 1-OF-8 DECODER-WITH ENABLE MILITARY AND COMMERCIAL TEMPERATURE RANGES

PIN DESCRIPTION

Pin Names Description

0–A2 Address Inputs

A

1, E2 Enable Inputs (Active LOW)

E

3 Enable Input (Active HIGH)

E

0–O7 Outputs (Active LOW)

O

2581 tbl 05

FUNCTION TABLE

Inputs Outputs

1

E

E

H X XXXXHHH HHHHH
X H XXXXHHH HHHHH
X X LXXXHHH HHHHH

L L HLLLLHH HHHHH
L L HHLLHLH HHHHH
L L HLHLHHL HHHHH
L L HHHLHHH LHHHH

L L HLLHHHHHLHHH
L L HHLHHHH HHLHH
L L HLHHHHH HHHLH
L L HHHHHHH HHHHL

E

2 E3 A0 A1 A2

E

O

0

O

O

1 O2

O

O

3

O

O

4

O

O

5

O

O

6

O

O

7

O

2581 tbl 06

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol Rating Commercial Military Unit

(2)

V

TERM

Terminal Voltage –0.5 to +7.0 –0.5 to +7.0 V
with Respect
to GND

(3)

V

TERM

Terminal Voltage –0.5 to VCC –0.5 to VCC V
with Respect
to GND

T

A Operating 0 to +70 –55 to +125 °C

Temperature

T

BIAS Temperature –55 to +125 –65 to +135 °C

Under Bias

T

STG Storage –55 to +125 –65 to +150 °C

Temperature

P

T Power Dissipation 0.5 0.5 W

OUT DC Output Current 120 120 mA

I

NOTES: 2581 tbl 01

1. Stresses greater than those listed under ABSOLUTE MAXIMUM
RATINGS may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other
conditions above those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability. No terminal voltage
may exceed V

2. Inputs and V

3. Outputs and I/O terminals only.

CC by +0.5V unless otherwise noted.

CC terminals only.

CAPACITANCE (TA = +25°C, f = 1.0MHz)

Symbol Parameter

IN Input Capacitance V IN = 0V 6 10 pF

C

OUT Output Capacitance VOUT = 0V 8 12 pF

C

NOTE: 2581 tbl 02

1. This parameter is guaranteed characterization data and not tested.

(1)

Conditions Typ. Max. Unit

7.3 2

IDT54/74FCT138/A/C
FAST CMOS 1-OF-8 DECODER-WITH ENABLE MILITARY AND COMMERCIAL TEMPERATURE RANGES

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified: VLC = 0.2V; VHC = VCC – 0.2V
Commercial: TA = 0°C to +70°C, VCC = 5.0V ± 5%; Military: TA = –55°C to +125°C, VCC = 5.0V ± 10%

Symbol Parameter Test Conditions

IH Input HIGH Level Guaranteed Logic HIGH Level 2.0 — — V

V

IL Input LOW Level Guaranteed Logic LOW Level — — 0.8 V

V
I

IH Input HIGH Current VCC = Max. VI = VCC ——5µA

(1)

I= 2.7V — — 5

V

Min. Typ.

IIL Input LOW Current VI= 0.5V — — –5

VI = GND — — –5

IK Clamp Diode Voltage VCC = Min., IN = –18mA — –0.7 –1.2 V

V

OS Short Circuit Current VCC = Max.

I
V

OH Output HIGH Voltage VCC = 3V, VIN = VLC or VHC, IOH = –32µAVHC VCC —V

CC = Min. IOH = –300µAVHC VCC —

V

IN = VIH or VIL IOH = –12mA MIL. 2.4 4.3 —

V

OL Output LOW Voltage VCC = 3V, VIN = VLC or VHC, IOL = 300µA — GND VLC V

V

CC = Min. IOL = 300µA — GND VLC

V

(3)

, VO = GND –60 –120 — mA

I

OH = –15mA COM’L. 2.4 4.3 —

VIN = VIH or VIL IOL = 32mA MIL. — 0.3 0.5

OL = 48mA COM’L. — 0.3 0.5

I

NOTES: 2581 tbl 03

1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.

2. Typical values are at V

3. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second.

4. This parameter is guaranteed but not tested.

CC = 5.0V, +25°C ambient and maximum loading.

(2)

Max. Unit

(4)

(4)

(4)

POWER SUPPLY CHARACTERISTICS

VLC = 0.2V; VHC = VCC – 0.2V

Symbol Parameter Test Conditions

CC Quiescent Power Supply Current Vcc = Max. — 0.2 1.5 mA

I

V

IN ≥ VHC; VIN ≤ VLC

∆ICC Quiescent Power Supply Current Vcc = Max. — 0.5 2.0 mA

TTL Inputs HIGH V

ICCD Dynamic Power Supply Current

(4)

IN = 3.4V

Vcc = Max. VIN ≥ VHC — 0.15 0.3 mA/MHz
Outputs Open V
One Output Toggling
50% Duty Cycle

I

C Total Power Supply Current

(5)

Vcc = Max. VIN ≥ VHC — 1.7 4.5 mA
Outputs Open V
Toggle

50% Duty Cycle V
f

O = 10MHz VIN = GND

One Output Toggling

NOTES: 2581 tbl 04

1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.

2. Typical values are at V

3. Per TTL driven input (V

4. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.

5. I

C = IQUIESCENT + IINPUTS + IDYNAMIC

IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fONO)

CC = Quiescent Current

I

CC = Power Supply Current for a TTL High Input (VIN = 3.4V)

∆I

H = Duty Cycle for TTL Inputs High

D
N

T = Number of TTL Inputs at DH

ICCD = Dynamic Current Caused by an Output Transition Pair (HLH or LHL)

CP = Clock Frequency for Register Devices (Zero for Non-Register Devices)

f

O = Output Frequency

f
N

O = Number of Outputs at fO

All currents are in milliamps and all frequencies are in megahertz.

CC = 5.0V, +25°C ambient.

IN = 3.4V); all other inputs at VCC or GND.

(3)

E

1, E2 or E3 (FCT)

(1)

IN ≤ VLC

IN ≤ VLC

IN = 3.4V — 2.0 5.5

Min. Typ.

(2)

Max. Unit

7.3 3

IDT54/74FCT138/A/C
FAST CMOS 1-OF-8 DECODER-WITH ENABLE MILITARY AND COMMERCIAL TEMPERATURE RANGES

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

IDT54/74FCT138 IDT54/74FCT138A IDT54/74FCT138C

Com’l. Mil. Com’l. Mil. Com’l. Mil.

Symbol Parameter Condition

(1)

tPLH Propagation Delay CL = 50pF 1.5 9.0 1.5 12.0 1.5 5.8 1.5 7.8 1.5 5.1 1.5 6.0 ns
t

PHL An to On RL = 500Ω

t

PLH Propagation Delay 1.5 9.0 1.5 12.5 1.5 5.9 1.5 8.0 1.5 5.2 1.5 6.1 ns

t

PHL

E

1 or E2 to On

tPLH Propagation Delay 1.5 9.0 1.5 12.5 1.5 5.9 1.5 8.0 1.5 5.2 1.5 6.1 ns
t

PHL E3 to On

NOTES: 2581 tbl 07

1. See test circuit and waveforms.

2. Minimum limits are guaranteed but not tested on Propagation Delays.

Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Unit

7.3 4

IDT54/74FCT138/A/C
FAST CMOS 1-OF-8 DECODER-WITH ENABLE MILITARY AND COMMERCIAL TEMPERATURE RANGES

TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS

VCC

500Ω

Pulse

Generator

VIN

D.U.T.

RT

VOUT

50pF

CL

500Ω

7.0V

SWITCH POSITION

Test Switch

Open Drain

Disable Low Closed

Enable Low

All Other Test Open

DEFINITIONS: 2581 tbl 08

CL = Load capacitance: includes jig and probe capacitance.

T = Termination resistance: should be equal to ZOUT of the Pulse

R

Generator.

SET-UP, HOLD AND RELEASE TIMES PULSE WIDTH

DATA

INPUT

TIMING

INPUT

ASYNCHRONOUS CONTROL

PRESET

CLEAR

ETC.

SYNCHRONOUS CONTROL

PRESET

CLOCK ENABLE

CLEAR

ETC.

t

tSU

SU

t

REM

t

t

H

H

3V

1.5V
0V

3V

1.5V
0V

3V

1.5V
0V

3V

1.5V
0V

LOW-HIGH-LOW

HIGH-LOW-HIGH

PULSE

PULSE

1.5V

t

W

1.5V

SAME PHASE

INPUT TRANSITION

OUTPUT

OPPOSITE PHASE

INPUT TRANSITION

t

t

PLH

PLH

t

t

PHL

PHL

3V

1.5V
0V

V

OH

1.5V
V

OL

3V

1.5V
0V

ENABLE AND DISABLE TIMESPROPAGATION DELAY

ENABLE DISABLE

3V

CONTROL

INPUT

t

PHZ

t

PLZ

OUTPUT

NORMALLY

LOW

OUTPUT

NORMALLY

HIGH

t

PZL

SWITCH
CLOSED

t

PZH

SWITCH
OPEN

3.5V

1.5V

1.5V
0V

NOTES 2581 drw 04

1. Diagram shown for input Control Enable-LOW and input Control
Disable-HIGH.

2. Pulse Generator for All Pulses: Rate ≤ 1.0 MHz; Z
t

R ≤ 2.5ns.

1.5V
0V

3.5V

0.3V

V

OL

V

OH

0.3V
0V

O ≤ 50Ω; tF ≤ 2.5ns;

7.3 5

IDT54/74FCT138/A/C
FAST CMOS 1-OF-8 DECODER-WITH ENABLE MILITARY AND COMMERCIAL TEMPERATURE RANGES

ORDERING INFORMATION

XXIDT FCT

Temperature

Range

X

Device

Type

X

Package

X

Process

Blank
B

P
D
SO
E
L

138
138A
138C

54
74

Commercial
MIL-STD-883, Class B

Plastic DIP
CERDIP
Small Outline IC
CERPACK
Leadless Chip Carrier

1-of-8 Decoder
Fast 1-of-8 Decoder
Super Fast 1-of-8 Decoder

–55°C to +125°C
0°C to +70°C

2581 drw 03

7.3 6