SDLS083 - MARCH 1974 - REVISED MARCH 1988
PRODUCTION DATA documents contain information current as of publicationdate. Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily include testingof all parameters.
The '246 and '247 are electrically and functionally identical to the SN5446A/SN7446A,and SN5447A/SN7447A respectively, and have the same pin assignments as theirequivalents. The 'LS247 and 'LS248 are electrically and functionally identicalto the SN54LS47/SN74LS47 and SN54LS48/SN74LS48, respectively, and have thesame pin assignments as their equivalents. They can be used interchangeablyin present or future designs to offer designers a choice between two indicatorfonts. The '46A, '47A, 'LS47, and 'LS48 compose the and the without tails and the '246,'247, 'LS247, and 'LS248 compose the andthe with tails. Composition of all othercharacters, including display patterns for BCD inputs above nine, is identical.The '246, '247, and 'LS247 feature active-low outputs designed for drivingindicators directly, and the 'LS248 features active-high outputs for drivinglamp buffers. All of the circuits have full ripple-blanking input/output controlsand a lamp test input. Segment identification and resultant displays are shownbelow. Display patterns for BCD input counts above 9 are unique symbols toauthenticate input conditions.
All of these circuits incorporate automatic leading and/or trailing-edgezero-blanking control (RBI\ and RBO\). Lamp test (LT\) of these types may be performed at any time when the BI\/RBO\ node is at a high level. All types contain an overriding blankinginput (BI) which can be used to control the lamp intensity by pulsing or toinhibit the outputs. Inputs and outputs are entirely compatible for use withTTL logic outputs.
Series 54 and Series 54LS devices are characterized for operation overthe full military temperature range of -55°C to 125°C; Series 74 andSeries 74LS devices are characterized for operation from 0°C to 70°C.
View more information about generic part numbers:SN74246, SN74247, SN74LS247, SN74LS248
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