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SN54ALS193A 데이터시트(PDF) 1 Page - Texas Instruments |
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SN54ALS193A 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 8 page SN54ALS193A, SN74ALS193A SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS WITH DUAL CLOCK AND CLEAR SDAS211C – DECEMBER 1982 – REVISED JULY 1996 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Look-Ahead Circuitry Enhances Cascaded Counters D Fully Synchronous in Count Modes D Parallel Asynchronous Load for Modulo-N Count Lengths D Asynchronous Clear D Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs description The ’ALS193A are synchronous, reversible, 4-bit up/down binary counters. Synchronous counting operation is provided by having all flip-flops clocked 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 either count/clock (UP or DOWN) input. The direction of the count is determined by which count input is pulsed while the other count input is high. All four counters are fully programmable; that is, each output may be preset to either level by placing a low on the load (LOAD) input and entering the desired data at the data inputs. The output changes to agree with the data inputs independently of the count pulses. This feature allows the counters to be used as modulo-N dividers by simply modifying the count length with the preset inputs. A high level applied to the clear (CLR) input forces all outputs to the low level. The clear function is independent of the count and LOAD inputs. The UP, DOWN, and LOAD inputs are buffered to lower the drive requirement, which significantly reduces the loading on, or current required by, clock drivers, etc., for long parallel words. These counters are designed to be cascaded without the need for external circuitry. The borrow (BO) output produces a low-level pulse while the count is zero (all Q outputs low) and the DOWN input is low. Similarily, the carry (CO) output produces a low-level pulse while the count is 9 or 15 (all Q outputs high) and the UP input is low. The counters can then be easily cascaded by feeding BO and CO to the count-down and count-up inputs, respectively, of the succeeding counter. The SN54ALS193A is characterized for operation over the full military temperature range of – 55 °C to 125°C. The SN74ALS193A is characterized for operation from 0 °C to 70°C. Copyright © 1996, Texas Instruments Incorporated 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. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 B QB QA DOWN UP QC QD GND VCC A CLR BO CO LOAD C D SN54ALS193A ...J PACKAGE SN74ALS193A ...D OR N PACKAGE (TOP VIEW) SN54ALS193A . . . FK PACKAGE (TOP VIEW) 32 1 20 19 910 11 12 13 4 5 6 7 8 18 17 16 15 14 CLR BO NC CO LOAD QA DOWN NC UP QC NC – No internal connection |
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