CY54/74FCT240T
CY54/74FCT244T
SCCS017 - May 1994 - Revised February 2000
8-Bit Buffers/Line Drivers
• Sink current
Source current
64 mA (Com’l), 48 mA (Mil)
32 mA (Com’l), 12 mA (Mil)
Features
• Function, pinout, and drive compatible with FCT and
F logic
Functional Description
• FCT-D speed at 3.6 ns max. (Com’l FCT244 only),
FCT-C speed at 4.1 ns max. (Com’l),
The FCT240T and FCT244T are octal buffers and line drivers
designed to be employed as memory address drivers, clock
drivers, and bus-oriented transmitters/receivers. The devices
provide speed and drive capabilities equivalent to their fastest
bipolar logic counterparts while reducing power consumption. The
input and output voltage levels allow direct interface with TTL,
NMOS, and CMOS devices without external components.
FCT-A speed at 4.8 ns max. (Com’l)
• Reduced VOH (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
The outputs are designed with a power-off disable feature to
allow for live insertion of boards.
• Fully compatible with TTL input and output logic levels
• Extended commercial range of −40˚C to +85˚C
Logic Block Diagram
FCT240T
FCT244T
OE
A
OE
A
OE
B
OE
B
DA
0
OA
0
DA
0
OA
0
DB
0
OB
0
DB
0
OB
0
DA
1
OA
1
DA
1
OA
1
OB
1
DB
1
OB
1
DB
1
DA
2
OA
2
DA
2
OA
2
OB
2
DB
2
OB
2
DB
2
DA
3
OA
3
DA
3
OA
3
DB
OB
3
3
DB
OB
3
3
FCT240T–1
FCT240T–4
Pin Configurations
DIP/SOIC/QSOP
Top View
DIP/SOIC/QSOP
Top View
LCC
LCC
Top View
Top View
1
1
20
20
OE
A
V
CC
OE
A
V
CC
2
3
4
5
6
19
2
3
4
5
6
19
18
17
16
DA
OE
B
DA
OE
B
0
0
18
17
OB
OA
0
OB
OA
0
0
0
7
6
5
4
7 6 5 4
8
8
DA
DB
0
DA
DB
0
1
OB
OB
OB
DA
1
3
3
0
9
9
3
2
1
3
2
1
OB
DA
0
FCT244T 16
OB
OA
1
GND
GND
FCT240T
OB
OA
1
1
0
1
10
11
10
11
FCT240T
0
FCT244T
DB
3
DB
3
OE
A
15
14
DA
DB
1
15
14
DA
DB
1
2
OE
2
A
OA
3
V
CC
OA
3
DB
2
12
13
V
12
13
7
20
19
20
19
7
8
9
CC
OB
DA
OA
2
OB
DA
OA
2
2
2
OE
B
DB
2
OE
B
8
13
12
11
13
12
11
DB
2
DB
3
3
2
1516 17 18
1516 17 18
14
14
9
OB
OA
3
OB
OA
3
3
3
GND
10
DB
3
10
GND
DB
3
FCT240T–2
FCT240T–3
FCT240T–5
FCT240T–6
Copyright © 2000, Texas Instruments Incorporated