(PDF) HD74HCT688 Datasheet - 8-bit Magnitude Comparator

Número de pieza	HD74HCT688
Descripción	8-bit Magnitude Comparator
Fabricantes	Hitachi Semiconductor
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No Preview Available ! HD74HCT688 8-bit Magnitude Comparator Description The HD74HCT688 compares bit for bit two 8-bit words and indicate whether or not they are equal. The P=Q output indicates equality when it is low. A single active low enable is provided to facilitate cascading of several packages and enable comparison of words greater than 8 bits. This device is useful in memory block decoding applications, where memory block enable signals must be generated from computer address information. Features • LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility • High Speed Operation: tpd (Data to P=Q) = 18 ns typ (CL = 50 pF) • High Output Current: Fanout of 10 LSTTL Loads • Wide Operating Voltage: VCC = 4.5 to 5.5 V • Low Input Current: 1 µA max • Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Inputs Data P, Q P=Q P>Q P<Q X Enable G L L L H P=Q L H H H 1 page 24.50 25.40 Max 20 11 1 0.89 1.30 1.27 Max 10 Unit: mm 7.62 2.54 ± 0.25 0.48 ± 0.10 0.25 + – 0.11 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-20N — Conforms 1.26 g 5 Page

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PDF HD74HCT688 Data sheet ( Hoja de datos )