SNJ54192W by Texas Instruments | Counter Shift Register | Avnet AMERICAS
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SNJ54192W

Texas Instruments

Counter Single 4-Bit Decade UP/Down 16-Pin CFPAK Tube

Manufacturer Part #: SNJ54192W

Alternate Part #: SNJ54192W


legend RoHS Non-Compliant

Descriptions

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Subs/Alternatives

Information

These monolithic circuits are synchronous reversible (up/down) counters having a complexity of 55 equivalent gates. The '192 and 'LS192 circuits are BCD counters and the '193 and 'LS193 are 4-bit binary counters. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincidently with each other when so instructed by the steering logic. This mode of operation eliminates the output counting spikes which are normally associated with asynchronous (ripple-clock) counters.

The outputs of the four master-slave flip-flops are triggered by a low-to-high-level transition of either count (clock) input. The direction of counting is determined by which count input is pulsed while the other count input is high.

All four counters are fully programmable; that is, each output may be preset to either level by entering the desired data at the data inputs while the load input is low. The output will change to agree with the data inputs independently of the count pulses. This feature allows the counters to be used as modulo-N dividers by simply modifying the count length with the preset inputs.

A clear input has been provided which forces all outputs to the low level when a high level is applied. The clear function is independent of the count and load inputs. The clear, count, and load inputs are buffered to lower the drive requirements. This reduces the number of clock drivers etc., required for long words.

These counters are designed to be cascaded without the need for external circuitry. Both borrow and carry outputs are available to cascade both the up- and down-counting functions. The borrow output produces a pulse equal in width to the count-down input when the counter underflows. Similarly, the carry output produces a pulse equal in width to the count-up input when an overflow condition exists. The counters can then be easily cascaded by feeding the borrow and carry outputs to the count-down and count-up inputs respectively of the succeeding counter.

Key Features

  • Cascading Circuitry Provided Internally
  • Synchronous Operation
  • Individual Preset to Each Flip-Flop
  • Fully Independent Clear Input
  • Technical Attributes

    Description
    Value
    Find similar Parts
    Maximum Operating Supply Voltage
    5.5 V
    Parallel Enable Input
    Yes
    Triggering Type
    Positive-Edge
    Minimum Operating Supply Voltage
    4.5 V
    Mounting
    Surface Mount
    Number of Elements per Chip
    1
    Fabrication Technology
    Bipolar
    Number of Count Input Enables
    2
    Maximum Propagation Delay Time @ Maximum CL
    47@5V ns
    Number of Element Inputs
    4
    Number of Element Outputs
    4
    Propagation Delay Test Condition
    15 pF
    Number of Stages
    4
    Logic Function
    Counter
    Terminal Count Output
    Yes
    Direction Type
    Bi-Directional
    Screening Level
    Military
    Operation Mode
    UP Counter|Down Counter
    Typical Operating Supply Voltage
    5 V
    Operating Temperature
    -55 to 125 °C
    Type
    Decade

    ECCN / UNSPSC

    Description
    Value
    ECCN:
    EAR99
    SCHEDULE B:
    8542310000
    UNSPSC:
    32101635
    UNSPSC VERSION:
    V15.1101
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    Your Price:

    USD    $22.09

    Factory Stock:

    565
  • Lead time: 6 weeks
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