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

®

FAST CMOS

1-OF-8 DECODER

WITH ENABLE

Integrated Device Technology, Inc.

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.)

•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 (A0, A1, A2) and, when enabled, provide eight mutually exclusive active LOW outputs (O0 - O7). The IDT54/74FCT138/A/C feature three enable inputs, two active LOW (E1, E2) and one active HIGH (E3). All outputs will be HIGH unless E1 and E2 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.

FUNCTIONAL BLOCK DIAGRAM

A2 A1

A0

E1 E2 E3

O7 O6 O5 O4 O3 O2 O1 O0

2581 drw 02

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

PIN CONFIGURATIONS

	A0	1		16	Vcc
	A1	2	P16-1,	15	O0
	A2	3		14	O1
	E1	4	D16-1,	13	O2
			SO16-1
	E2	5		12	O3
			&
	E3	6	E16-1	11	O4
	O7	7		10	O5
	GND	8		9	O6

DIP/SOIC/CERPACK

TOP VIEW

INDEX	A1	A0 NC		Vcc	O0
	3	2		20 19
A2	4				18	O1
		1
E1	5	L20-2			17	O2
NC	6				16	NC
E2	7				15	O3
E3	8				14	O4
	9	10 11 12 13
	O7	GND NC		O6	O5	2581 drw 01

LCC

TOP VIEW

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
A0–A2	Address Inputs
E1, E2	Enable Inputs (Active LOW)
E3	Enable Input (Active HIGH)
O0–O7	Outputs (Active LOW)

2581 tbl 05

FUNCTION TABLE

Inputs

Outputs

E1

E2

E3

A0

A1

A2

O0

O1

O2

O3

O4

O5

O6

O7

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

ABSOLUTE MAXIMUM RATINGS(1)

Symbol	Rating	Commercial	Military	Unit
VTERM(2)	Terminal Voltage	–0.5 to +7.0	–0.5 to +7.0	V
	with Respect
	to GND
VTERM(3)	Terminal Voltage	–0.5 to VCC	–0.5 to VCC	V
	with Respect
	to GND
TA	Operating	0 to +70	–55 to +125	°C
	Temperature
TBIAS	Temperature	–55 to +125	–65 to +135	°C
	Under Bias
TSTG	Storage	–55 to +125	–65 to +150	°C
	Temperature
PT	Power Dissipation	0.5	0.5	W
IOUT	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 VCC by +0.5V unless otherwise noted.

2.Inputs and VCC terminals only.

3.Outputs and I/O terminals only.

2581 tbl 06

CAPACITANCE (TA = +25°C, f = 1.0MHz)

Symbol	Parameter(1)	Conditions	Typ.	Max.	Unit
CIN	Input Capacitance	VIN = 0V	6	10	pF
COUT	Output Capacitance	VOUT = 0V	8	12	pF
NOTE:				2581 tbl 02

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

7.3

2