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CY74FCT480TQSOP Datasheet(PDF) 1 Page - Texas Instruments |
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CY74FCT480TQSOP Datasheet(HTML) 1 Page - Texas Instruments |
1 / 8 page Dual 8-Bit Parity Generator/Checker CY54/74FCT480T Data sheet acquired from Cypress Semiconductor Corporation. Data sheet modified to remove devices not offered. SCCS025 - May 1993 - Revised March 2000 Copyright © 2000, Texas Instruments Incorporated 1CY54/74FCT480T 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 VOH (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 64 mA (Com’l), 32 mA (Mil) Source Current 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 Pin Configurations FCT480T–1 28 4 5 6 7 8 9 10 3 2 1 27 13 14 15 16 17 26 25 24 23 22 21 20 11 12 19 18 LCC Top View A1 B1 CHK/GEN PAR2 VCC NC A2 B2 ERROR ODD2 NC GND ODD1 C1 A1 B1 C1 D1 E1 F1 G1 H1 PAR1 CHK/GEN ERR A2 B2 C2 D2 E2 F2 G2 H2 PAR2 ODD2 ODD1 FCT480T–2 1 2 3 4 5 6 7 8 9 10 11 12 16 17 18 19 20 24 23 22 21 13 14 A1 B1 C1 D1 E1 F1 G1 H1 PAR1 CHK/GEN ODD1 GND VCC A2 B2 C2 D2 F2 G2 H2 ERROR PAR2 ODD2 FCT480T–3 15 E2 DIP/SOIC/QSOP Top View |
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