Details, datasheet, quote on part number: 74AC11160N
Part74AC11160N
CategoryLogic => Counters => Binary Counters
Descriptionti 74AC11160, Synchronous 4-Bit Decade Counters
CompanyTexas Instruments, Inc.
DatasheetDownload 74AC11160N datasheet
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Features, Applications

Internal Look-Ahead for Fast Counting Carry Output for n-Bit Cascading Fully Synchronous Operation for Counting Flow-Through Architecture to Optimize PCB Layout Center-Pin VCC and GND Pin Configurations Minimize High-Speed Switching Noise EPIC TM (Enhanced-Performance Implanted CMOS) 1-m Process 500-mA Typical Latch-Up Immunity at 125C Package Options Include Plastic Small-Outline Packages and Standard Plastic 300-mil DIPs

description

This synchronous, presettable 4-bit decade counter features an internal carry look-ahead circuitry 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 inputs and internal gating. This mode of operation eliminates the output counting spikes that are normally associated with asynchronous (ripple clock) counters; however, counting spikes may occur on the ripple carry out output (RCO). A buffered clock input triggers the four flip-flops on the rising (positive-going) edge of the clock input waveform. This counter is fully programmable in that they may be preset to any number between 0 and 9. 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 74AC11160 is synchronous and a low level at the clear input sets all four of the flip-flops outputs low, regardless of the levels of the clock, load, or enable inputs. If one of these decade counters is preset to a number between 10 and 15 or assumes such an invalid state when power is applied, it will progress to the normal sequence within two counts as shown in the state diagram. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional gating. Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output. Both count-enable inputs (ENP and ENT) must be high to count, and ENT is fed forward to enable the ripple carry output (RCO). RCO thus enabled will produce a high-level pulse while the count is 9 (HLLH). This high-level overflow ripple carry pulse can be used to enable successive cascaded stages. Transitions at the ENP or ENT are allowed regardless of the level of the clock input. This counter features a fully independent clock circuit. Changes at control inputs (ENP, ENT, or LOAD) that will 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) will be dictated solely by the conditions meeting the setup and hold times. The 74AC11160 is characterized for operation from to 85C.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

 

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