High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counters

The CD54/74HC190 are asynchronously presettable BCD decade Counters whereas the CD54/74HC191 and CD54/74HCT191 are asynchronously presettable binary Counters
Presetting the Counter to the number on preset data inputs (A?D) is accomplished by a low asynchronous parallel load (LOAD) input. Counting occurs when LOAD is high, count enable (CTEN) is low, and the down/up (D/U) input is either high for down counting or low for up counting. The Counter is decremented or incremented synchronously with the low-to-high transition of the Clock
When an overflow or underflow of the Counter occurs, the MAX/MIN output, which is low during counting, goes high and remains high for one Clock cycle. This output CAN be used for look-ahead carry in high-speed cascading (see Figure 1). The MAX/MIN output also initiates the ripple Clock (RCO) output, which is normally high, goes low and remains low for the low-level portion of the Clock pulse. These Counters CAN be cascaded using RCO (see Figure 2).
If a decade Counter is preset to an illegal state or assumes an illegal state when power is applied, it returns to the normal sequence in one or two counts, as shown in the state diagrams (see Figure 3).
By Texas Instruments
Part Manufacturer Description Datasheet Samples
CD74HC191H Texas Instruments HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, UUC16, DIE
CD74HC191M96 Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counters 16-SOIC -55 to 125
CD74HC191M96G4 Texas Instruments HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GREEN, PLASTIC, MS-012AC, SOIC-16
CD74HC191M Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counters 16-SOIC -55 to 125
CD74HC191M96E4 Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counters 16-SOIC -55 to 125
CD74HC191ME4 Texas Instruments HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GREEN, PLASTIC, MS-012AC, SOIC-16
CD74HC191MG4 Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counters 16-SOIC -55 to 125
CD74HC191MT Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counters 16-SOIC -55 to 125
CD74HC191MTE4 Texas Instruments HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GREEN, PLASTIC, MS-012AC, SOIC-16
CD74HC191NSR Texas Instruments HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, SOP-16
CD74HC191 's PackagesCD74HC191 's pdf datasheet
CD74HC191E PDIP
CD74HC191EE4 PDIP
CD74HC191M SOIC
CD74HC191M96 SOIC
CD74HC191M96E4 SOIC
CD74HC191M96G4 SOIC
CD74HC191ME4 SOIC
CD74HC191MG4 SOIC
CD74HC191MT SOIC
CD74HC191MTE4 SOIC
CD74HC191MTG4 SOIC




CD74HC191 Pinout, Pinouts
CD74HC191 pinout,Pin out
This is one package pinout of CD74HC191,If you need more pinouts please download CD74HC191's pdf datasheet.

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