鈥?/div>
IDT54/74FCT521 equivalent to FAST speed
IDT54/74FCT521A 35% faster than FAST
IDT54/74FCT521B 50% faster than FAST
IDT54/74FCT521C 60% 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.)
TM
鈥?Product available in Radiation Tolerant and Radiation
Enhanced versions
鈥?JEDEC standard pinout for DIP and LCC
鈥?Military product compliant to MIL-STD-883, Class B
DESCRIPTION:
The IDT54/74FCT521/A/B/C are 8-bit identity comparators
built using an advanced dual metal CMOS technology. These
devices compare two words of up to eight bits each and
provide a LOW output when the two words match bit for bit.
The expansion input
I
A = B
also serves as an active LOW
enable input.
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATIONS
I
A=B
1
2
3
4
5
6
7
8
9
10
P20-1
D20-1
SO20-2
&
E20-1
20
19
18
17
16
15
14
13
12
11
V
CC
O
A=B
B
7
A
7
B
6
A
6
B
5
A
5
B
4
A
4
2604 drw 01
A
0
B
0
A
1
B
1
A
2
B
2
A
3
B
3
A
4
B
4
A
5
B
5
A
6
B
6
A
7
B
7
I
A=B
2604 drw 03
A
0
B
0
A
1
B
1
A
2
B
2
A
3
B
3
GND
O
A=B
DIP/SOIC/CERPACK
TOP VIEW
3 2
A
1
B
1
A
2
B
2
A
3
4
5
6
7
8
A
0
I
A=B
V
CC
1
B
0
INDEX
20 19
18
17
16
15
14
O
A=B
B
7
A
7
B
6
A
6
B
5
L20-2
9 10 11 12 13
GND
B
3
B
4
A
4
A
5
2604 drw 02
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FAST is a trademark of National Semiconductor Co.
LCC
TOP VIEW
MILITARY AND COMMERCIAL TEMPERATURE RANGES
漏1992
Integrated Device Technology, Inc.
MAY 1992
DSC-4617/2
7.16
1
1
2
3
4
5
6
