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CD74AC161

Features: ·Internal Look-Ahead for Fast Counting·Carry Output for n-Bit Cascading·Synchronous Counting·Synchronously Programmable·SCR-Latchup-Resistant CMOS Process and Circuit Design·Exceeds 2 kV ESD Protection per MIL-STD-883, Method 3015·Package Options Include Plastic Small-Outline (M), Standa...

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SeekIC No. : 004311879 Detail

CD74AC161: Features: ·Internal Look-Ahead for Fast Counting·Carry Output for n-Bit Cascading·Synchronous Counting·Synchronously Programmable·SCR-Latchup-Resistant CMOS Process and Circuit Design·Exceeds 2 kV E...

CD74AC161 Data Sheet

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Part Number:
CD74AC161
Supply Ability:
5000

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  • 1~5000
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  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

·Internal Look-Ahead for Fast Counting
·Carry Output for n-Bit Cascading
·Synchronous Counting
·Synchronously Programmable
·SCR-Latchup-Resistant CMOS Process and Circuit Design
·Exceeds 2 kV ESD Protection per MIL-STD-883, Method 3015
·Package Options Include Plastic Small-Outline (M), Standard Plastic (E) and Ceramic (F) DIPs


Pinout

Connection Diagram


Specifications

Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 0.5 V to 6 V
Input clamp current, IIK (VI < 0 V or VI > VCC) (see Note 2) . . . . . . . . . . . . . . . ±20 mA
Output clamp current, IOK (VO < 0 V or VO > VCC) (see Note 2) . . . . . . . .. . . . . ±50 mA
Continuous output current, IO (VO > 0 V or VO < VCC) . . . . . . . . . . . . . . . . . . . . ±50 mA
Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100 mA
Package thermal impedance, JA (see Note 3): E package . . . . . . . . . . . . . . . . . . 67/W
M package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . . . 73/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 65 to 150

Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

3. The package thermal impedance is calculated in accordance with JESD 51.


Description

The CD54AC161 and CD74AC161 devices are 4-bit binary counters. These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed counting designs. 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 normally are 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.

CD74AC161 are fully programmable; that is, they can be preset to any number between 0 and 9 or 15. Presetting is synchronous; therefore, 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 is asynchronous. A low level at the clear (CLR) input sets all four of the CD74AC161 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 CD74AC161 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.

The CD74AC161 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.

The CD54AC161 is characterized for operation over the full military temperature range of 55 to 125.

The CD74AC161 is characterized for operation from 40 to 85.




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