74ACT259

MC74AC259, MC74ACT259 8-Bit Addressable Latch The MC74AC259/74ACT259 is a high−speed 8−bit addressable latch designed for general purpose storage applications in digital systems. It is a multifunctional device capable of storing single line data in eight addressable latches, and also a 1−of−8 decoder and demultiplexer with active HIGH outputs. The device also incorporates an active LOW Common Clear for resetting all latches, as well as an active LOW Enable. It is functionally identical to the ALS259 8−bit addressable latch. Serial−to−Parallel Conversion Eight Bits of Storage with Output of Each Bit Available Random (Addressable) Data Entry Active High Demultiplexing or Decoding Capability Easily Expandable Common Clear These are Pb−Free Devices VCC MR E D Q7 Q6 Q5 Q4 16 15 14 13 12 11 10 9 www.onsemi.com 16 1 MARKING DIAGRAM 16 SOIC−16 D SUFFIX CASE 751B 1 xxx259G AWLYWW xxx = AC or ACT A = Assembly Location WL = Wafer Lot Y = Year WW = Work Week G = Pb−Free Package 12345678 A0 A1 A2 Q0 Q1 Q2 Q3 GND Figure 1. Pinout: 16−Lead Packages Conductors (Top View) A0 E D A1 A2 MR Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet. Figure 2. Logic Symbol MODE SELECT TABLE E MR Mode L H Addressable Latch H H Memory L L Active HIGH 8−Channel Demultiplexer H L Clear H = HIGH Voltage Level L = LOW Voltage Level © Semiconductor Components Indu...