SN74F193A SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTER WITH DUAL CLOCK AND CLEAR

SDFS031A - D3693, JANUARY 1991 - REVISED OCTOBER 1993

features

High-Speed f_max of 100 MHz Typical
Parallel Asynchronous Load for Modulo-N Count Lengths
Look-Ahead Circuitry Enhances Speed of Cascaded Counters
Fully Synchronous in Count Modes
Package Options Include Plastic Small-Outline Packages and Standard Plastic 300-mil DIPs

description

The SN74F193A is a synchronous, 4-bit binary up/down counter.Synchronous counting operation is provided by having all flip-flopsclocked simultaneously so that the outputs change coincident witheach other when so instructed by the steering logic. This mode ofoperation eliminates the output counting spikes normally associatedwith asynchronous (ripple-clock) counters.

The outputs of the four flip-flops are triggered on alow-to-high-level transition of either count/clock (UP or DOWN)input. The direction of the count is determined by which count inputis pulsed while the other count input is high.

All four counters are fully programmable; that is, each output maybe preset to either level by placing a low on the input and entering the desired dataat the data (D) inputs. The output will change to agree with the datainputs independently of the count pulses. This feature allows thecounters to be used as modulo-N dividers by simply modifying thecount length with the preset inputs.

A high level applied to the clear (CLR) input forces all outputsto the low level. The clear function is independent of the count andload inputs.

These counters were designed to be cascaded without the need forexternal circuitry. The borrow () output produces a low-level pulse while the count iszero (all Q outputs low) and the DOWN input is low. Similarily, thecarry () outputproduces a low-level pulse while the count is 15 (all Q outputs high)and the UP input is low. The counters can then be easily cascaded byfeeding the borrow and carry outputs to the count-down and count-upinputs, respectively, of the succeeding counter.

The SN74F193A is characterized for operation from 0°C to70°C.

Title: SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTER WITH DUAL CLOCK AND CLEAR
Product Family: BINARY
Device Functionality: BINARY
Orderable Devices: SN74F193AD, SN74F193AN

View the complete PDF datasheet: sdfs031a.pdf (105 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN74F193A

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