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DM74LS469 - 8-Bit Up/Down Counter

General Description

The ’LS469 is an 8-bit synchronous up/down counter with parallel load and hold capability.

Three function-select inputs (LD, UD, CBI) provide one of four operations which occur synchronously on the rising edge of the clock (CK).

D0) into the output reg

Key Features

  • Benefits n 8-bit up/down counter for microprogram-counter, DMA controller and general-purpose counting.

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Full PDF Text Transcription for DM74LS469 (Reference)

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DM74LS469 8-Bit Up/Down Counter April 1998 DM74LS469 8-Bit Up/Down Counter General Description The ’LS469 is an 8-bit synchronous up/down counter with parallel load and h...

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LS469 is an 8-bit synchronous up/down counter with parallel load and hold capability. Three function-select inputs (LD, UD, CBI) provide one of four operations which occur synchronously on the rising edge of the clock (CK). The LOAD operation loads the inputs (D7–D0) into the output register (Q7–Q0). The HOLD operation holds the previous value regardless of clock transitions. The INCREMENT operation adds one to the output register when the carry-in input is TRUE (CBI = LOW), otherwise the operation is a HOLD. The carry-out (CBO) is TRUE (CBO = LOW) when the output register (Q7–Q0) is all HIGHs, otherwise FALSE (CBO = HIGH)

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