Texas Instruments CY74FCT138CTSOC, CY74FCT138CTQCT, CY74FCT138CTQC, CY74FCT138ATSOCT, CY74FCT138ATSOC Datasheet

1-of-8 Decoder

CY54/74FCT138T

SCCS013 - May 1994 - Revised February 2000

Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.

Copyright © 2000, Texas Instruments Incorporated

Features

• Function, pinout, and drive compatible with FCT and

F logic

• FCT-C speed at 5.0 ns max. (Com’l),

FCT-A speed at 5.8 ns max. (Com’l)

• Reduced V

OH

(typically = 3.3V) versions of equivalent

FCT functions

• Edge-rate control circuitry for significantly improved

noise characteristics

• Power-off disable feature

• ESD > 2000V

• Matched rise and fall times

• Fully compatible with TTL input and output logic levels

• Extended commercial range of −40˚C to +85˚C

• Sink current 64 mA (Com’l),
32 mA (Mil)

Source current 32 mA (Com’l),

12 mA (Mil)

• Dual 1-of-8 decoder with enables

Functional Description

The FCT138T is a 1-of-8 decoder. The FCT138T accepts
three binary weighted inputs (A

0,A1,A2

) and, when enabled,
provides eight mutually exclusive active LOW outputs
(

O0–O7). The FCT138T features three enable inputs, two

active LOW (

E1, E2) and one active HIGH (E3).

All inputs 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 FCT138T devices and one inverter.

The outputs are designed with a power-off disable feature to
allow for liv e insertion of boards.

Pin Description

Name Description

A Address Inputs
E1−E

2

Enable Inputs (Active LOW)

E

3

Enable Input (Active HIGH)

O Outputs

Logic Block Diagram Pin Configurations

1
2
3
4
5
6
7
8

A

1

A

2

E

1

E

2

E

3

O

7

V

CC

GND

FCT138T–2

Top View

4

8
9
10
11
12

765

15 16 17 18

3
2
1

20

13

14

19

E3E2E

1

O

2

O

4

O

5

O

1

O

6

NC

A

1

NC

NC

V

CC

O

0

O

7

GND A

0

O

3

Top View

DIP/SOIC/QSOP

A

2

LCC

NC

16
15
14
13
12
11

10

9

O

4

O

5

O

6

O

7

O

0

O

1

O

2

O

3

E

1

A2A

1

A

0

E2E

3

FCT138T–1

A

0

O

4

O

5

O

6

O

0

O

1

O

2

O

3

FCT138T–3

CY54/74FCT138T

2

]

Maximum Ratings

[2, 3]

(Above which the useful life may be impaired. For user
guidelines, not tested.)

Storage Temperature .................................–65°C to +150°C

Ambient Temperature with

Power Applied.............................................–65°C to +135°C

Supply Voltage to Ground Potential...............–0.5V to +7.0V

DC Input Voltage............................................–0.5V to +7.0V

DC Output Voltage.........................................–0.5V to +7.0V

DC Output Current (Maximum Sink Current/Pin).......120 mA

Power Dissipation..........................................................0.5W

Static Discharge Voltage............................................>2001V

(per MIL-STD-883, Method 3015)

Function Table

[1]

Inputs Outputs

E

1

E

2

E

3

A

0

A

1

A

2

O

0

O

1

O

2

O

3

O

4

O

5

O

6

O

7

H
X
X

X
H
X

X
X
L

X
X
X

X
X
X

X
X
X

H
H
H

H
H
H

H
H
H

H
H
H

H
H
H

H
H
H

H
H
H

H
H
H

L
L
L
L

L
L
L
L

H
H
H
H

L
H
L
H

L
L
H
H

L
L
L
L

L
H
H
H

H

L
H
H

H
H

L

H

H
H
H
L

H
H
H
H

H
H
H
H

H
H
H
H

H
H
H
H

L
L
L
L

L
L
L
L

H
H
H
H

L
H
L
H

L
L
H
H

H
H
H
H

H
H
H
H

H
H
H
H

H
H
H
H

H
H
H
H

L
H
H
H

H
L
H
H

H
H

L

H

H
H
H

L

Operating Range

Range Range

Ambient

Temperature V

CC

Commercial All –40°C to +85°C 5V ± 5%
Military

[4]

All –55°C to +125°C 5V ± 10%

Electrical Characteristics Over the Operating Range

Parameter Description Test Conditions Min. Typ.

[5]

Max. Unit

V

OH

Output HIGH Voltage VCC=Min., IOH=–32 mA Com’l 2.0 V

V

OH

Output HIGH Voltage VCC=Min., IOH=–15 mA Com’l 2.4 3.3 V

V

OH

Output HIGH Voltage VCC=Min., IOH=–12 mA Mil 2.4 3.3 V

V

OL

Output LOW Voltage VCC=Min., IOL=64 mA Com’l 0.3 0.55 V

VCC=Min., IOL=32 mA Mil 0.3 0.55 V

V

IH

Input HIGH Voltage 2.0 V

V

IL

Input LOW Voltage 0.8 V

V

H

Hysteresis

[6]

All inputs 0.2 V

V

IK

Input Clamp Diode Voltage VCC=Min., IIN=–18 mA –0.7 –1.2 V

I

I

Input HIGH Current VCC=Max., VIN=V

CC

5 µA

I

IH

Input HIGH Current VCC=Max., VIN=2.7V ±1 µA

I

IL

Input LOW Current VCC=Max., VIN=0.5V ±1 µA

I

OS

Output Short Circuit Current

[7]

VCC=Max., V

OUT

=0.0V –60 –120 –225 mA

I

OFF

Power-Off Disable VCC=0V, V

OUT

=4.5V ±1 µA

Notes:

1. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care.

2. Unless otherwise noted, these limits are over the operating free-air temperature range.

3. Unused inputs must always be connected to an appropriate logic voltage level, preferably either V

CC

or ground.

4. T

A

is the “instant on” case temperature.

5. Typical values are at V

CC

=5.0V, TA=+25˚C ambient.

6. This parameter is specified but not tested.

7. Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample
and hold techniques are preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting of
a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter
tests, I

OS

tests should be performed last.

CY54/74FCT138T

3

Capacitance

[6]

Parameter Description Typ.

[5]

Max. Unit

C

IN

Input Capacitance 5 10 pF

C

OUT

Output Capacitance 9 12 pF

Power Supply Characteristics

Parameter Description Test Conditions Typ.

[5]

Max. Unit

I

CC

Quiescent Power Supply Current VCC=Max., VIN<0.2V,

V

IN

> VCC–0.2V

0.1 0.2 mA

∆I

CC

Quiescent Power Supply Current
(TTL inputs)

VCC=Max., VIN=3.4V,

[8]

f1=0, Outputs Open

0.5 2.0 mA

I

CCD

Dynamic Power Supply
Current

[9]

VCC=Max., One Input Toggling,
50% Duty Cycle, Outputs Open,
V

IN

< 0.2V or VIN> VCC–0.2V

0.06 0.12 mA/MHz

I

C

Total Power Supply Current

[10]

VCC=Max., f1=10 MHz,
50% Duty Cycle, Outputs Open, Toggle
E1, E2, or E3, One Output Toggling

,

VIN< 0.2V or VIN> VCC–0.2V

0.7 1.4 mA

VCC=Max., f1=10 MHz,
50% Duty Cycle, Outputs Open, Toggle
E1, E2, or E3, One Output Toggling,
V

IN

=3.4V or VIN=GND

1.0 2.4 mA

Notes:

8. Per TTL driven input (V

IN

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

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

10. I

C

=I

QUIESCENT

+ I

INPUTS

+ I

DYNAMIC

IC=ICC+∆ICCDHNT+I

CCD(f0

/2 + f1N1)

I

CC

= Quiescent Current with CMOS input levels

∆I

CC

= Power Supply Current for a TTL HIGH input (VIN=3.4V)

D

H

= Duty Cycle for TTL inputs HIGH

N

T

= Number of TTL inputs at D

H

I

CCD

= Dynamic Current caused by an input transition pair (HLH or LHL)

f

0

= Clock frequency for registered devices, otherwise zero

f

1

= Input signal frequency

N

1

= Number of inputs changing at f

1

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

CY54/74FCT138T

4

Document #: 38-00297-B

Switching Characteristics Over the Operating Range

Parameter Description

FCT138T FCT138AT

Unit

Fig.

No.

[12]

Commercial Commercial

Min.

[11]

Max. Min.

[11]

Max.

t

PLH

t

PHL

Propagation Delay
A to

O

1.5 9.0 1.5 5.8 ns 1, 2

t

PLH

t

PHL

Propagation Delay
E1 or E2 to O

1.5 9.0 1.5 5.9 ns 1, 5

t

PLH

t

PHL

Propagation Delay
E

3

to O

1.5 9.0 1.5 5.9 ns 1, 5

Parameter Description

FCT138CT

Unit Fig. No.

[12]

Military Commercial

Min.

[11]

Max. Min.

[11]

Max.

t

PLH

t

PHL

Propagation Delay A to O 1.5 6.0 1.5 5.0 ns 1, 2

t

PLH

t

PHL

Propagation Delay E1 or E2 to O 1.5 6.1 1.5 5.0 ns 1, 5

t

PLH

t

PHL

Propagation Delay E3 to O 1.5 6.1 1.5 5.0 ns 1, 5

Ordering Information

Speed

(ns) Ordering Code

Package

Name Package Type

Operating

Range

5.0 CY74FCT138CTQCT Q1 16-Lead (150-Mil) QSOP Commercial
CY74FCT138CTSOC/SOCT S1 16-Lead (300-Mil) Molded SOIC

5.8 CY74FCT138ATQCT Q1 16-Lead (150-Mil) QSOP Commercial
CY74FCT138ATSOC/SOCT S1 16-Lead (300-Mil) Molded SOIC

6.0 CY54FCT138CTLMB L61 20-Pin Square Leadless Chip Carrier Military

9.0 CY74FCT138TQCT S1 16-Lead (150-Mil) QSOP Commercial

Notes:

11. Minimum limits are specified but not tested on Propagation Delays.

12. See “Parameter Measurement Information” in the General Information Section.

CY54/74FCT138T

5

Package Diagrams

16-Lead (300-Mil) CerDIP D2

MIL-STD-1835 D-2 Config.A

20-Pin Square Leadless Chip Carrier L61

MIL-STD-1835 C-2A

16-Lead Quarter Size Outline Q1

CY54/74FCT138T

6

Package Diagrams (continued)

16-Lead Molded SOIC S1

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