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74AC11191

Part Number	74AC11191
Manufacturer	Texas Instruments
Description	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTER
Published	Aug 19, 2019
Detailed Description	74AC11191 SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTER • Single Down/Up Count Control Line • Look-Ahead Circuitry Enhances ...
Datasheet	74AC11191 PDF File

Overview

74AC11191 SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTER • Single Down/Up Count Control Line • Look-Ahead Circuitry Enhances Speed of Cascaded Counters • Fully Synchronous in Count Modes • Asynchronously Presettable with Load Control • Flow-Through Architecture to Optimize PCB Layout • Center-Pin VCC and GND Configurations to Minimize High-Speed Switching Noise t• EPIC (Enhanced-Performance Implanted CMOS) 1-mm Process • 500-mA Typical Latch-Up Immunity at 125°C • Package Options Include Plastic Small-Outline Packages and Standard Plastic 300-mil DIPs SCAS105A – FEBRUARY 1990 – REVISED APRIL 1993 DW OR N PACKAGE (TOP VIEW) RCO QA QB GND GND GND GND QC QD MAX/MIN 1 2 3 4 5 6 7 8 9 10 20 D/U 19 CLK 18 A 17 B 16 VCC 15 VCC 14 C 13 D 12 CTEN 11 LOAD description The 74AC11191 is a synchronous, 4-bit binary reversible up/down counter.
Synchronous counting operation is provided by clocking all flip-flops simultaneously so that the outputs change coincident with each other when instructed by the steering logic.
This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple clock) counters.
The outputs of the four flip-flops are triggered on a low-to-high-level transition of the clock input if the enable input (CTEN) is low.
A high at CTEN inhibits counting.
The direction of the count is determined by the level of the down/up (D/U) input.
When D/U is low, the counter counts up and when D/U is high, it counts down.
These counters feature a fully independent clock circuit.
Changes at the control inputs (CTEN and D/U) that will modify the operating mode have no effect on the contents of the counter until clocking occurs.
The function of the counter will be dictated solely by the condition meeting the stable setup and hold times.
These counters are fully programmable; that is, the outputs may be preset to any number between 0 and 15 by placing a low on the load input and entering the desired data at the data inputs.
The outputs will ch...

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