QS74FCT521T

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...