CY5474FCT480T Datasheet, PDF (1/8 Pages) Texas Instruments – Dual 8-Bit Parity Generator/Checker

1CY54/74FCT480T
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
CY54/74FCT480T
SCCS025 - May 1993 - Revised March 2000
Dual 8-Bit Parity Generator/Checker
Features
• Function, pinout and drive compatible with FCT and F
logic
• FCT-A speed at 7.5 ns max. (Com’l)
FCT-B speed at 5.6 ns max. (Com’l)
• Reduced V_OH (typically = 3.3V) versions of equivalent
FCT functions
• Edge-rate control circuitry for significantly improved
noise characteristics
• Power-off disable feature
• Matched rise and fall times
• ESD > 2000V
• Fully compatible with TTL input and output logic levels
• Sink Current
Source Current
64 mA (Com’l),
32 mA (Mil)
32 mA (Com’l),
12 mA (Mil)
• Two 8-bit parity generator/checkers
• Open drain Active LOW parity error output
• Expandable for larger word widths
Functional Description
The FCT480T is a high-speed dual 8-bit parity
generator/checker. Each parity generator/checker accepts
eight data bits and one parity bit as inputs, and generates a
sum and parity error output. The FCT480T can be used in
ODD parity systems. The parity error output is open-drain,
designed for easy expansion of the word width by a wired-OR
connection of several FCT480T type devices. Since additional
logic is not needed, the parity generation or checking times
remain the same as for an individual FCT480T device.
The outputs are designed with a power-off disable feature to
allow for live insertion of boards.
Logic Block Diagram
A₁
B₁
C₁
D₁
E₁
F₁
G₁
H₁
PAR₁
CHK/GEN
A₂
B₂
C₂
D₂
E₂
F₂
G₂
H₂
PAR₂
ODD₁
ERR
ODD₂
FCT480T–1
Pin Configurations
LCC
Top View
CHK/GEN
ODD₁
GND
NC
1110 ^{9 8 7 6 5}
12
4
13
3
14
2
15
1
C₁
B₁
A₁
NC
ODD_{2 16}
ERROR ₁₇
28
27
V_CC
A₂
PAR_{2 18}
26 ^B2
19 20 21 22 23 24 25
FCT480T–2
DIP/SOIC/QSOP
Top View
A₁ ¹
B₁ ²
C₁ ³
D₁ 4
E₁ 5
F₁ 6
G₁ 7
H₁ 8
PAR₁ 9
CHK/GEN 10
ODD₁ 11
GND 12
24 V_CC
23 _A2
22 _B2
21 _C2
20 D₂
19 E₂
18 F₂
17 G₂
16 H₂
15 ^PAR2
14 ERROR
13 ODD₂
FCT480T–3
Copyright © 2000, Texas Instruments Incorporated