CY54FCT480T, CY74FCT480T
DUAL 8-BIT PARITY GENERATORS/CHECKERS
SCCS025B 鈥?MAY 1993 鈥?REVISED OCTOBER 2001
D
D
D
D
D
D
D
D
D
D
D
D
Function, Pinout, and Drive Compatible
With FCT and F Logic
Reduced V
OH
(Typically = 3.3 V) Versions
of Equivalent FCT Functions
Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
I
off
Supports Partial-Power-Down Mode
Operation
Matched Rise and Fall Times
Fully Compatible With TTL Input and
Output Logic Levels
Two 8-Bit Parity Generators/Checkers
Open-Drain Active-Low Parity-Error Output
Expandable for Larger Word Widths
ESD Protection Exceeds JESD 22
鈥?2000-V Human-Body Model (A114-A)
鈥?200-V Machine Model (A115-A)
鈥?1000-V Charged-Device Model (C101)
CY54FCT480T
鈥?32-mA Output Sink Current
鈥?12-mA Output Source Current
CY74FCT480T
鈥?64-mA Output Sink Current
鈥?32-mA Output Source Current
CY74FCT480T . . . P, Q, OR SO PACKAGE
(TOP VIEW)
A
1
B
1
C
1
D
1
E
1
F
1
G
1
H
1
PAR
1
CHK/GEN
ODD
1
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
A
2
B
2
C
2
D
2
E
2
F
2
G
2
H
2
PAR
2
ERROR
ODD
2
CY54FCT480T . . . L PACKAGE
(TOP VIEW)
C
1
B
1
A
1
NC
VCC
A
2
B
2
D
1
E
1
F
1
NC
G
1
H
1
PAR
1
5
6
7
8
9
10
4
3 2
1 28 27 26
25
24
23
22
21
20
19
11
12 13 14 15 16 17 18
C
2
D
2
E
2
NC
F
2
G
2
H
2
description
The 鈥橣CT480T devices are high-speed, dual,
8-bit parity generators/checkers. Each parity
generator/checker accepts eight data bits and
one parity bit as inputs, and generates a sum and
NC 鈥?No internal connection
parity-error (ERROR) output. These devices can
be used in odd-parity systems. ERROR is an
open-drain output designed for easy expansion of
the word width by a wired-OR connection of several 鈥橣CT480T devices. Because no additional logic is needed,
the parity-generation or parity-checking times remain the same as for an individual 鈥橣CT480T device.
These devices are fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the
outputs, preventing damaging current backflow through the device when it is powered down.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright
錚?/div>
2001, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
CHK/GEN
ODD
1
GND
NC
ODD
2
ERROR
PAR
2
1
1
2
3
4
5
6
7
8
9
