High Speed CMOS 8-Bit Identity Comparator
Q
QSFCT521T, 2521T
HigHhigShpSepeedeCdMCOMSOS Bu8s-EBxitchange
Identity SCwomitcphaersator
QS54/74QFCST3532813T QS54/7...
Description
Q
QSFCT521T, 2521T
HigHhigShpSepeedeCdMCOMSOS Bu8s-EBxitchange
Identity SCwomitcphaersator
QS54/74QFCST3532813T QS54/74QFCS3T22358231T
FEATURES/BENEFITS
Pin and function compatible to the 74F521, 74FCT521, and 74ALS521
CMOS power levels: <7.5 mW static Available in DIP, SOIC, QSOP, ZIP, HQSOP Undershoot clamp diodes on all inputs
TTL-compatible input and output levels Ground bounce controlled outputs Reduced output swing of 0-3.5V Military product compliant to MIL-STD-883
FCT-T 521T
FCT-T 2521T
JEDEC-FCT spec compatible Fastest CMOS logic family available Standard thru D speed grades; 3.9 ns tPD for D IOL = 48 mA Com., 32 mA Mil.
DESCRIPTION
Built-in 25Ω series resistor outputs reduce reflection and other system noise
Standard thru D speed grades; 3.9 ns tPD for D IOL = 12 mA Com.
The QSFCT521 and QSFCT2521 are high-speed CMOS TTL-compatible 8-bit identity comparators. Two words of up to eight bits are compared and a low output is provided when the words match. An expansion input allows the comparison to be extended over multiple words. All inputs have clamp diodes for undershoot noise suppression. All outputs have ground bounce suppression (see QSI Application Note AN-001).
FUNCTIONAL BLOCK DIAGRAM
A0 B0
A1 B1
A2 B2
A3 B3
A4 B4
A5 B5
A6 B6
A7 B7
IA = B
25Ω
(FCT2521 Only)
OA = B
MDSL-00019-02
QUALITY SEMICONDUCTOR, INC.
1
QSFCT521T, 2521T
PIN CONFIGURATIONS (All Pins Top View)
PDIP, SOIC, QSOP, HQSOP
lA=B
A0 B0 A1 B1 A2 B2 A3...
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