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DM8899 Datasheet (DM8898 / DM8899) TRI-STATE BCD to Binary/Binary to BCD Converters

Manufacturer: National Semiconductor (now Texas Instruments)

Download the DM8899 datasheet PDF. This datasheet also includes the DM8898 variant, as both parts are published together in a single manufacturer document.

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Note: The manufacturer provides a single datasheet file (DM8898_NationalSemiconductor.pdf) that lists specifications for multiple related part numbers.

General Description

These circuits are the TRI-STATE versions of the popular BCD to binary and binary to BCD converters DM74184 and DM74185A respectively They are derived from the 256-bit ROM DM8598 Emitter connections are made to provide direct read out of converted codes at outputs Y8 through Y1 as shown in the truth tables Both converters comprehend the fact that the least significant bits (LSB) of the binary and BCD codes are logically equal and in each case the LSB bypasses the converter Thus a 6-bit converter is produced in each case and both devices are cascadable An overriding enable input is provided on each converter which when taken high inhibits the function causing all outputs to go into the high-impedance state For this reason and to minimize power consumption unused outputs Y7 and Y8 of the 185A and all ‘‘don’t care’’ conditions of the 184 are programmed high DM8898 BCD-TO-BINARY CONVERTERS The 6-bit BCD-to-binary function of the DM8898 is analogous to the algorithm a Shift BCD number right one bit and examine each decade Subtract three from each 4-bit decade containing a binary value greater than seven b Shift right examine and correct after each shift until the least significant decade contains a number smaller than eight and all other converted decades contain zeros In addition to BCD-to-binary conversion the DM8898 is programmed to generate BCD 9’s complement or BCD 10’s complement In each case one bit of the complement code is logically equal to one of the BCD bits therefore these complements can be produced on three lines As outputs Y6 Y7 and Y8 are not required in the BCD-to-binary conversion they are utilized to provide these complement codes as specified in the function table when the devices are connected as shown DM8899A BINARY-TO-BCD CONVERTERS The function performed by these 6-bit binary-to-BCD conve

Overview

DM8898 DM8899 TRI-STATE BCD to Binary Binary to BCD Converters January 1987 DM8898 DM8899 TRI-STATE BCD to Binary Binary to BCD.

Key Features

  • Y Y TRI-STATE versions of DM74184 DM74185A Typical propagation delay 30 ns Connection Diagram Dual-In-Line Package TL F 6593.
  • 1 Order Number DM8898N or DM8899N See NS Package Number N16A TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 6593 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Dis.

More Datasheets from National Semiconductor (now Texas Instruments)

Part Number Description
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