鈥?/div>
IDT54/74FCT139 equivalent to FAST鈩?speed
IDT54/74FCT139A 35% faster than FAST
IDT54/74FCT139C 45% faster than FAST
Equivalent to FAST output drive over full temperature
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碌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
The IDT54/74FCT139/A/C are dual 1-of-4 decoders built
using an advanced dual metal CMOS technology. These
devices have two independent decoders, each of which
accept two binary weighted inputs (A
0
-A
1
) and provide four
mutually exclusive active LOW outputs (
O
0
-
O
3
). Each de-
coder has an active LOW enable (
E
). When
E
is HIGH, all
outputs are forced HIGH.
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATIONS
E
a
1
2
3
4
5
6
7
8
16
15
P16-1
D16-1 14
SO16-1 13
&
12
E16-1
11
10
9
V
CC
E
b
A
0b
A
1b
O
0b
O
1b
O
2b
O
3b
E
a
A
0a
A
1a
E
b
A
0b
A
1b
A
0a
A
1a
O
0a
O
1a
O
2a
O
3a
GND
DIP/SOIC/CERPACK
TOP VIEW
2605 cnv* 01
O
0a
O
1a
O
2a
O
3a
O
0b
O
1b
O
2b
O
3b
2605 cnv* 03
3
A
1a
O
0a
NC
O
1a
O
2a
4
5
6
7
8
2
1
20 19
18
17
16
15
14
V
CC
E
b
A
0a
E
a
NC
INDEX
A
0b
A
1b
NC
O
0b
O
1b
L20-2
9 10 11 12 13
GND
NC
O
3a
O
3b
LCC
TOP VIEW
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FAST is a trademark of National Semiconductor Co.
O
2b
2605 cnv* 02
MILITARY AND COMMERCIAL TEMPERATURE RANGES
漏1992
Integrated Device Technology, Inc.
MAY 1992
DSC 4613/3
7.4
7.4
1
1
1
2
3
4
5
6
