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DM74184N
DM74184 DM74185A BCD-to-Binary and Binary-to-BCD Converters General Description These monolithic converters are derived from the 256-bit read only memories DM5488 and DM7488 Emitter connections are made to provide direct read-out of converted codes at outputs Y8 through Y1 as shown in the function tables These converters demonstrate the versatility of a read only memory in that an unlimited number of reference tables or conversion tables may be built into a system Both of these converters comprehend that the least significant bits (LSB) of the binary and BCD codes are logically equal and in each case the LSB bypasses the converter as illustrated in the typical applications This means that a 6-bit converter is produced in each case Both devices are cascadable to N bits An overriding enable input is provided on each converter which when taken high inhibits the function causing all outputs to go high 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 The outputs are of the open-collector type DM74184 BCD-TO-BINARY CONVERTERS The 6-bit BCD-to-binary function of the DM74184 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 DM74184 is programmed to generate BCD 9’s complement or BCD 10’s complement Again 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 DM74185A BINARY-TO-BCD CONVERTERS The function performed by these 6-bit binary-to-BCD converters is analogous to the algorithm a Examine the three most significant bits If the sum is greater than four add three and shift left one bit b Examine each BCD decade If the sum is greater than four add three and shift left one bit c Repeat step b until the least-significant binary bit is in the least-significant BCD location (Continued) Connection Diagram TL F 6561 – 1 Order Number DM74184N or DM74185AN See NS Package Number N16E C1995 National Semiconductor Corporation TL F 6561 RRD-B30M105 Printed in U S A DM74184 DM74185A BCD-to-Binary and Binary-to-BCD Converters June 1989
NS
National Semiconductor Corporation 日本ではナショセミと略称されていたが2011年9月23日、米TI社に買収され、同社のシリコンバレー部門となった。
TI
Texas Instruments Incorporated
U.S.A
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