background image

Integrated Device Technology, Inc.

MILITARY AND COMMERCIAL TEMPERATURE RANGES

MAY 1992

©

1992 Integrated Device Technology, Inc.

7.3

DSC-4625/3

®

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

FAST is a  trademark of National Semiconductor Co.

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 tem-

perature and voltage supply extremes

• I

OL

 = 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

(5

µ

A max.)

• 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.

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 (A

0

, A

1

,

A

2

) and, when enabled, provide eight mutually exclusive

active LOW outputs (

O

0

 - 

O

7

).  The IDT54/74FCT138/A/C

feature three enable inputs, two active LOW (

E

1

E

2

) and one

active HIGH (E

3

).  All outputs will be HIGH unless 

E

1

 and 

E

2

are LOW and E

3

 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.

FUNCTIONAL BLOCK DIAGRAM

PIN CONFIGURATIONS

DIP/SOIC/CERPACK

TOP VIEW

4

5

6

7

8

L20-2

18

17

16

15

14

INDEX

2581 drw 01

E

3

NC

NC

Vcc

NC

GND

NC

A

2

E

1

E

2

A

0

A

1

O

0

O

1

O

2

O

3

O

4

O

7

O

5

O

6

9 10 11 12 13

3

2

1

20 19

LCC

TOP VIEW

IDT54/74FCT138

IDT54/74FCT138A

IDT54/74FCT138C

FAST CMOS

1-OF-8 DECODER

WITH ENABLE

2581 drw 02

O

0

O

1

O

2

O

3

O

4

O

5

O

6

O

7

E

1

E

2

E

3

A

0

A

1

A

2

5

6

7

8

A

0

A

1

1

2

3

4

16

15

14

13

12

11

10

9

Vcc

P16-1,

D16-1,

SO16-1

&

E16-1

A

2

E

1

E

2

GND

O

0

O

1

O

2

O

3

O

4

O

O

6

O

7

5

E

3

1

background image

 7.3

2

IDT54/74FCT138/A/C

FAST CMOS 1-OF-8 DECODER-WITH ENABLE

MILITARY AND COMMERCIAL TEMPERATURE RANGES

PIN DESCRIPTION

Pin Names

Description

A

0

–A

2

Address Inputs

E

1

E

2

Enable Inputs (Active LOW)

E

3

Enable Input (Active HIGH)

O

0

O

7

Outputs (Active LOW)

2581 tbl 05

FUNCTION TABLE

Inputs

Outputs

EE

1

EE

2

E

3

A

0

A

1

A

2

O

O

0

O

O

1

O

2

O

O

3

O

O

4

O

O

5

O

O

6

O

O

7

H

X

X

X

X

X

H

H

H

H

H

H

H

H

X

H

X

X

X

X

H

H

H

H

H

H

H

H

X

X

L

X

X

X

H

H

H

H

H

H

H

H

L

L

H

L

L

L

L

H

H

H

H

H

H

H

L

L

H

H

L

L

H

L

H

H

H

H

H

H

L

L

H

L

H

L

H

H

L

H

H

H

H

H

L

L

H

H

H

L

H

H

H

L

H

H

H

H

L

L

H

L

L

H

H

H

H

H

L

H

H

H

L

L

H

H

L

H

H

H

H

H

H

L

H

H

L

L

H

L

H

H

H

H

H

H

H

H

L

H

L

L

H

H

H

H

H

H

H

H

H

H

H

L

2581 tbl 06

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol

Rating

Commercial

Military

Unit

V

TERM

(2)

Terminal Voltage

 –0.5 to +7.0  –0.5 to +7.0

V

with Respect

to GND

V

TERM

(3)

Terminal Voltage

 –0.5 to V

CC

 –0.5 to V

CC

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

I

OUT

DC Output Current

120

120

mA

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

CC

 by +0.5V unless otherwise noted.

2. Inputs and V

CC

 terminals only.

3. Outputs and I/O terminals only.

CAPACITANCE 

(T

A

 = +25

°

C, f = 1.0MHz)

 Symbol

Parameter

(1)

Conditions

Typ. Max. Unit

C

IN

Input Capacitance

V

IN

 = 0V

6

10

pF

C

OUT

Output Capacitance V

OUT

 = 0V

8

12

pF

NOTE:

2581  tbl  02

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

background image

IDT54/74FCT138/A/C

FAST CMOS 1-OF-8 DECODER-WITH ENABLE

MILITARY AND COMMERCIAL TEMPERATURE RANGES

 7.3

3

POWER SUPPLY CHARACTERISTICS

V

LC

 = 0.2V; V

HC

 = V

CC

 – 0.2V

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

Unit

I

CC

Quiescent Power Supply Current

Vcc = Max.

0.2

1.5

mA

V

IN

 

 V

HC

; V

IN

 

 V

LC

I

CC

Quiescent Power Supply Current

Vcc = Max.

0.5

2.0

mA

TTL Inputs HIGH

V

IN

 = 3.4V

(3)

I

CCD

Dynamic Power Supply Current

(4)

Vcc = Max.

V

IN

 

 V

HC

0.15

0.3

mA/MHz

Outputs Open

V

IN

 

 V

LC

One Output Toggling

50% Duty Cycle

I

C

Total Power Supply Current

(5)

Vcc = Max.

V

IN

 

 V

HC

1.7

4.5

mA

Outputs Open

V

IN

 

 V

LC

Toggle 

E

1

E

2

 or E

3

(FCT)

50% Duty Cycle

V

IN

  = 3.4V

2.0

5.5

f

= 10MHz

V

IN

  = 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

CC

 = 5.0V, +25

°

C ambient.

3. Per TTL driven input (V

IN

 = 3.4V); all other inputs at V

CC

 or GND.

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

5. I

C

 = I

QUIESCENT

 + I

INPUTS

 + I

DYNAMIC

I

C

 = I

CC

 + 

I

CC

 D

H

N

T

 + I

CCD

 (f

CP

/2 +  f

O

N

O

)

I

CC

 = Quiescent Current

I

CC

 = Power Supply Current for a TTL High Input (V

IN

 = 3.4V)

D

H

 = Duty Cycle for TTL Inputs High

N

= Number of TTL Inputs at D

H

I

CCD 

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

f

CP 

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

f

O

 = Output Frequency

N

O

 = Number of Outputs at f

O

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

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified: V

LC

 = 0.2V; V

HC

  = V

CC 

– 0.2V

Commercial: T

A

 = 0

°

C to +70

°

C, V

CC

 = 5.0V 

±

 5%; Military: T

A

 = –55

°

C to +125

°

C, V

CC

 = 5.0V 

±

 10%

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

Unit

V

IH

Input HIGH Level

Guaranteed Logic HIGH Level

2.0

V

V

IL

Input LOW Level

Guaranteed Logic LOW Level

0.8

V

I

IH

Input HIGH Current

V

CC 

= Max.

V

I

 = V

CC

5

µ

A

V

I

= 2.7V

5

(4)

I

IL

Input LOW Current

V

I

= 0.5V

–5

(4)

V

I

 = GND

–5

V

IK

Clamp Diode Voltage

V

CC 

= Min., I

N

 = –18mA

–0.7

–1.2

V

I

OS

Short Circuit Current

V

CC 

= Max.

(3)

, V

O

 = GND

–60

–120

mA

V

OH

Output HIGH Voltage

V

CC 

= 3V, V

IN

 = V

LC

 or V

HC

, I

OH

 = –32

µ

A

V

HC

V

CC

V

V

CC 

= Min.

I

OH

  = –300

µ

A

V

HC

V

CC

V

IN

 = V

IH 

or V

IL

I

OH

  = –12mA MIL.

2.4

4.3

I

OH

  = –15mA COM’L.

2.4

4.3

V

OL

Output LOW Voltage

V

CC 

= 3V, V

IN

 = V

LC

 or V

HC

, I

OL 

= 300

µ

A

GND

V

LC

V

V

CC 

= Min.

I

OL 

= 300

µ

A

GND

V

LC

(4)

V

IN

 = V

IH 

or V

IL

I

OL 

= 32mA MIL.

0.3

0.5

I

OL 

= 48mA COM’L.

0.3

0.5

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

CC

 = 5.0V, +25

°

C ambient and maximum loading.

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.

background image

 7.3

4

IDT54/74FCT138/A/C

FAST CMOS 1-OF-8 DECODER-WITH ENABLE

MILITARY AND COMMERCIAL TEMPERATURE RANGES

  t

PLH

Propagation Delay

C

L

 = 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

A

n

 to 

O

n

R

L

 = 500

  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 

E

2

 to 

O

n

  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

to 

O

n

NOTES:

2581  tbl 07

1. See test circuit and waveforms.

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

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

IDT54/74FCT138

IDT54/74FCT138A

IDT54/74FCT138C

Com’l.

Mil.

Com’l.

Mil.

Com’l.

Mil.

Symbol

Parameter

Condition

(1)

Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max.

Min.

(2)

Max. Min

.

(2)

Max.

Unit

background image

IDT54/74FCT138/A/C

FAST CMOS 1-OF-8 DECODER-WITH ENABLE

MILITARY AND COMMERCIAL TEMPERATURE RANGES

 7.3

5

TEST CIRCUITS AND WAVEFORMS

TEST CIRCUITS FOR ALL OUTPUTS

ENABLE AND DISABLE TIMES

PROPAGATION DELAY

SET-UP, HOLD AND RELEASE TIMES

PULSE WIDTH

Pulse

Generator

DATA

INPUT

TIMING 

INPUT

ASYNCHRONOUS CONTROL

PRESET

CLEAR

ETC.

SYNCHRONOUS CONTROL

PRESET

CLEAR

CLOCK ENABLE

ETC.

3V

1.5V

0V

3V

1.5V

0V

3V

1.5V

0V

3V

1.5V

0V

t

SU

t

H

t

REM

H

t

SU

R

T

D.U.T.

V

CC

V

IN

C

L

V

OUT

50pF

500

500

7.0V

SAME PHASE

INPUT TRANSITION

3V

1.5V

0V

1.5V

V

OH

V

OL

t

PLH

t

PHL

OUTPUT

OPPOSITE PHASE

INPUT TRANSITION

CONTROL

INPUT

3V

1.5V

0V

3.5V

0V

OUTPUT

NORMALLY

LOW

OUTPUT

NORMALLY

HIGH

SWITCH

CLOSED

SWITCH

OPEN

V

OL

V

OH

3V

1.5V

0V

t

PLH

t

PHL

0.3V

0.3V

t

PLZ

t

PZL

t

PZH

t

PHZ

3.5V

0V

1.5V

1.5V

ENABLE

DISABLE

HIGH-LOW-HIGH

PULSE

LOW-HIGH-LOW

PULSE

t

W

1.5V

1.5V

t

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

O

 

 50

; t

F

 

 2.5ns;

t

R

 

 2.5ns.

SWITCH POSITION

Test

Switch

Open Drain

Disable Low

Closed

Enable Low

All Other Test

Open

DEFINITIONS:

2581 tbl 08

C

L

 = Load capacitance: includes jig and probe capacitance.

R

T

 = Termination resistance: should be equal to Z

OUT

 of the Pulse

Generator.

background image

 7.3

6

IDT54/74FCT138/A/C

FAST CMOS 1-OF-8 DECODER-WITH ENABLE

MILITARY AND COMMERCIAL TEMPERATURE RANGES

ORDERING INFORMATION

Plastic DIP

CERDIP

Small Outline IC

CERPACK

Leadless Chip Carrier

P

D

SO

E

L

Temperature

Range

X

Device

Type

X

Package

X

Process

Blank

B

Commercial

MIL-STD-883, Class B

XX

IDT

FCT

138

138A

138C

1-of-8 Decoder

Fast 1-of-8 Decoder

Super Fast 1-of-8 Decoder

54

74

–55

°

C to +125

°

C

0

°

C to +70

°

C

2581 drw 03