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SN74HC191DRE4 датащи(PDF) 1 Page - Texas Instruments |
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SN74HC191DRE4 датащи(HTML) 1 Page - Texas Instruments |
1 / 17 page SN54HC191, SN74HC191 4BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS SCLS121D − DECEMBER 1982 − REVISED OCTOBER 2003 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Wide Operating Voltage Range of 2 V to 6 V D Outputs Can Drive Up To 10 LSTTL Loads D Low Power Consumption, 80-µA Max ICC D Typical tpd = 13 ns D ±4-mA Output Drive at 5 V D Low Input Current of 1 µA Max D Single Down/Up Count-Control Line D Look-Ahead Circuitry Enhances Speed of Cascaded Counters D Fully Synchronous in Count Modes D Asynchronously Presettable With Load Control description/ordering information The ’HC191 devices are 4-bit synchronous, reversible, 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 the clock (CLK) input if the count-enable (CTEN) input 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. ORDERING INFORMATION TA PACKAGE† ORDERABLE PART NUMBER TOP-SIDE MARKING PDIP − N Tube of 25 SN74HC191N SN74HC191N Tube of 40 SN74HC191D −40 °C to 85°C SOIC − D Reel of 2500 SN74HC191DR HC191 −40 C to 85 C SOIC − D Reel of 250 SN74HC191DT HC191 SOP − NS Reel of 2000 SN74HC191NSR HC191 CDIP − J Tube of 25 SNJ54HC191J SNJ54HC191J −55 °C to 125°C CFP − W Tube of 150 SNJ54HC191W SNJ54HC191W −55 C to 125 C LCCC − FK Tube of 55 SNJ54HC191FK SNJ54HC191FK † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. 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 CTEN D/U QC QD GND VCC A CLK RCO MAX/MIN LOAD C D SN54HC191 ...J OR W PACKAGE SN74HC191 . . . D, N, OR NS PACKAGE (TOP VIEW) 32 1 20 19 910 11 1213 4 5 6 7 8 18 17 16 15 14 CLK RCO NC MAX/MIN LOAD QA CTEN NC D/U QC SN54HC191 . . . FK PACKAGE (TOP VIEW) NC − No internal connection Copyright 2003, 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. On products compliant to MILPRF38535, all parameters are tested unless otherwise noted. On all other products, production processing does not necessarily include testing of all parameters. |
Аналогичный номер детали - SN74HC191DRE4 |
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Аналогичное описание - SN74HC191DRE4 |
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