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DM54LS469 Datasheet Dm54ls469/dm74ls469 8-bit Up/down Counter

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: DM54LS469 DM74LS469 8-Bit Up Down Counter July 1989 DM54LS469 DM74LS469 8-Bit Up Down.

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) 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 e LOW) otherwise the operation is a HOLD The carry-out (CBO) is TRUE (CBO e LOW) when the output register (Q7 – Q0) is all HIGHs otherwise FALSE (CBO e HIGH) The DECREMENT operation subtracts one from the output register when the borrow-in input is TRUE (CBI e LOW) otherwise the operation is a HOLD The borrow-out (CBO) is TRUE (CBO e LOW) when the output register (Q7 – Q0) is all LOWs otherwise FALSE (CBO e HIGH) The output register (Q7 –Q0) is enabled when OE is LOW and disabled (HI-Z) when OE is HIGH The output drivers will sink the 24 mA required for many bus-interface standards Two or more ‘LS469 octal up down counters may be cascaded to provide larger counters

Key Features

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

More Datasheets from National Semiconductor (now Texas Instruments)

Part Number Description
DM54LS460 10-Bit Comparator
DM54LS461 Octal Counter
DM54LS42 BCD/Decimal Decoders
DM54LS447 BCD to 7-Segment Decoder/Driver
DM54LS450 16:1 Multiplexer
DM54LS451 DM54LS451/DM74LS451 DUAL 8:1 Multiplexer
DM54LS00 Quad 2-Input NAND Gates
DM54LS02 Quad 2-Input NOR Gates
DM54LS03 Quad 2-Input NAND Gates with Open-Collector Outputs
DM54LS04 Hex Inverting Gates

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