Products > Integrated Circuits (ICs) > Counter ICs > CD74HC191MTE4
CD74HC191MTE4 SOIC-16
TI
  • CD74HC191MTE4
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CD74HC191MTE4

Counter ICs Hi-Sp CMOS Logic Pre Sync 4-Bit Bry Up/Dn

Manufacturer :
Texas Instruments, Inc
Package/Case :
SOIC-16
Product Categories :
Counter ICs
Datasheet:
CD74HC191MTE4 PDF
RoHs Status:
Rohs
In-stock:
200

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CD74HC191MTE4 Product Details

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).

Feature

  • 2-V to 6-V VCC Operation (’HC190,191)
  • 4.5-V to 5.5-V VCC Operation (’HCT191)
  • Wide Operating Temperature Range of –55 to 125°C
  • Synchronous Counting and Asynchronous Loading
  • Two Outputs for n-Bit Cascading
  • Look-Ahead Carry for High-Speed Counting
  • Balanced Propagation Delay and Transition Times
  • Standard Outputs Drive Up To 15 LS-TTL Loads
  • Significant Power Reduction Compared to LS-TTL Logic ICs

Technical Parameters

Counter Type Binary Counters Operating Temperature Range - 55 C to + 125 C
Logic Family CMOS Package / Case SOIC-16
Number of Bits 4 Packaging Reel
Counting Method Synchronous Mounting Style SMD/SMT
Counting Sequence Up/Down Factory Pack Quantity 250
Operating Supply Voltage 2 V to 6 V

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