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SN54LS190

Part Number	SN54LS190
Manufacturer	Motorola Inc
Description	PRESETTABLE BCD/DECADE UP/DOWN COUNTER
Published	Apr 16, 2005
Detailed Description	PRESETTABLE BCD/DECADE UP/DOWN COUNTERS PRESETTABLE 4-BIT BINARY UP/DOWN COUNTERS The SN54 / 74LS190 is a synchronous UP...
Datasheet	SN54LS190 PDF File

Overview

PRESETTABLE BCD/DECADE UP/DOWN COUNTERS PRESETTABLE 4-BIT BINARY UP/DOWN COUNTERS The SN54 / 74LS190 is a synchronous UP/ DOWN BCD Decade (8421) Counter and the SN54/ 74LS191 is a synchronous UP / DOWN Modulo-16 Binary Counter.
State changes of the counters are synchronous with the LOW-to-HIGH transition of the Clock Pulse input.
An asynchronous Parallel Load (PL) input overrides counting and loads the data present on the Pn inputs into the flip-flops, which makes it possible to use the circuits as programmable counters.
A Count Enable (CE) input serves as the carry / borrow input in multi-stage counters.
An Up / Down Count Control (U/D) input determines whether a circuit counts up or down.
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