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SN54LS190 - PRESETTABLE BCD/DECADE UP/DOWN COUNTER

Description

The LS190 is a synchronous Up / Down BCD Decade Counter and the LS191 is a synchronous Up / Down 4-Bit Binary Counter.

The operating modes of the LS190 decade counter and the LS191 binary counter are identical, with the only difference being the count sequences as noted in the state diagrams.

Features

  • e Min 25 35 20 5.0 40 Typ Max Unit ns ns ns ns ns VCC = 5.0 V Test Conditions.

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📁 Similar Datasheet

Part Number Description Manufacturer
SN54LS190 SYNCHRONOUS UP/DOWN COUNTERS Texas Instruments
SN54LS191 SYNCHRONOUS UP/DOWN COUNTERS Texas Instruments
SN54LS191 PRESETTABLE BCD/DECADE UP/DOWN COUNTER Motorola
SN54LS192 SYNCHRONOUS 4-BIT UP/DOWN COUNTERS Texas Instruments
SN54LS193 PRESETTABLE 4-BIT BINARY UP/DOWN COUNTER Motorola

Other Datasheets by Motorola Semiconductor (now NXP Semiconductors)

Part Number Description
SN54LS192 PRESETTABLE BCD/DECADE UP/DOWN COUNTER
SN54LS194A 4-BIT BIDIRECTIONAL UNIVERSAL SHIFT REGISTER
SN54LS195A UNIVERSAL 4-BIT SHIFT REGISTER
SN54LS196 4-STAGE PRESETTABLE RIPPLE COUNTERS
SN54LS10 TRIPLE 3-INPUT NAND GATE

Full PDF Text Transcription

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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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