Products > Integrated Circuits (ICs) > Counter ICs > SN74HC161PWRE4
SN74HC161PWRE4 TSSOP-16
TI
  • SN74HC161PWRE4
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SN74HC161PWRE4

4-BIT SYNCHRONOUS BINARY COUNTERS,Counter ICs 4-Bit Synchronous Binary Counters

Manufacturer :
Texas Instruments, Inc
Package/Case :
TSSOP-16
Product Categories :
Counter ICs
Datasheet:
SN74HC161PWRE4 PDF
RoHs Status:
Rohs
In-stock:
50000

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SN74HC161PWRE4 Product Details

These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed counting designs. The ’HC161 devices are 4-bit binary counters. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable (ENP, ENT) inputs and internal gating. This mode of operation eliminates the output counting spikes that are normally associated with synchronous (ripple-clock) counters. A buffered clock (CLK) input triggers the four flip-flops on the rising (positive-going) edge of the clock waveform.

These counters are fully programmable; that is, they can be preset to any number between 0 and 9 or 15. As presetting is synchronous, setting up a low level at the load input disables the counter and causes the outputs to agree with the setup data after the next clock pulse, regardless of the levels of the enable inputs.

The clear function for the ’HC161 devices is asynchronous. A low level at the clear (CLR)\ input sets all four of the flip-flop outputs low, regardless of the levels of the CLK, load (LOAD)\, or enable inputs.

The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional gating. Instrumental in accomplishing this function are ENP, ENT, and a ripple-carry output (RCO). Both ENP and ENT must be high to count, and ENT is fed forward to enable RCO. Enabling RCO produces a high-level pulse while the count is maximum (9 or 15 with QA high). This high-level overflow ripple-carry pulse can be used to enable successive cascaded stages. Transitions at ENP or ENT are allowed, regardless of the level of CLK.

These counters feature a fully independent clock circuit. Changes at control inputs (ENP, ENT, or LOAD\) that modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of the counter (whether enabled, disabled, loading, or counting) is dictated solely by the conditions meeting the stable setup and hold times.

Feature

  • Wide Operating Voltage Range of 2 V to 6 V
  • Outputs Can Drive Up To 10 LSTTL Loads
  • Low Power Consumption, 80-μA Max ICC
  • Typical tpd = 14 ns
  • ±4-mA Output Drive at 5 V
  • Low Input Current of 1 μA Max
  • Internal Look-Ahead for Fast Counting
  • Carry Output for n-Bit Cascading
  • Synchronous Counting
  • Synchronously Programmable

Technical Parameters

Counter Type Binary Counters Operating Temperature Range - 40 C to + 85 C
Logic Family CMOS Package / Case TSSOP-16
Number of Bits 4 Packaging Reel
Counting Method Asynchronous Mounting Style SMD/SMT
Operating Supply Voltage 2 V to 6 V Factory Pack Quantity 2000

SN74HC161PWRE4 Documents

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Texas Instruments Incorporated designs and manufactures analog technologies, digital signal processing (DSP) and microcontroller (MCU) semiconductors. TI is a leader in semiconductor solutions for ana...
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