SDLS050 - NOVEMBER 1971 - 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.
This TTL MSI circuit contains the equivalent of 86 gates on a single chip.Logic inputs and outputs are completely TTL compatible. The buffered inputsare implemented with relatively large resistors in series with the bases ofthe input transistors to lower drive-current requirements to one-half of thatrequired for a standard Series 54/74 TTL input. The serial-count-enable, actuallytwo internal emitters, is rated as one standard Series 54/74 load. The logicoutputs, except RBO\, have active pull-ups.
The SN74143 driver output is designed specifically to maintain a relativelyconstant on-level sink current of approximately 15 milliamperes from output “a"through “g" and seven milliamperes from output “dp" over a voltagerange from one to five volts. Any number of LED's in series may be drivenas long as the output voltage rating is not exceeded.
All inputs are diode-clamped to minimize transmission-line effects, therebysimplifying system design. Maximum clock frequency is typically 18 megahertzand power dissipation is typically 280 milliwatts. The SN74143 is characterizedfor operation from 0°C to 70°C.
Functions of the inputs and outputs of these devices are as follows:
View more information about generic part numbers:SN74143
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