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SN74ALS166 Datenblatt(PDF) 5 Page - Texas Instruments |
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SN74ALS166 Datenblatt(HTML) 5 Page - Texas Instruments |
5 / 16 page SN74ALS166 PARALLEL-LOAD 8-BIT SHIFT REGISTER SDAS156D – APRIL 1982 – REVISED AUGUST 2000 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION LOAD CIRCUIT FOR OUTPUT UNDER TEST TEST TABLE FOR SYNCHRONOUS INPUTS SH/LD H0 V 4.5 V QH at tn + 1 QH at tn + 1 VOLTAGE WAVEFORMS RL = 500 Ω CL = 50 pF (see Note A) From Output Under Test Test Point 3.5 V 0.3 V 3.5 V 0.3 V 3.5 0.3 V VOH VOL tw(clear) 1.3 V 1.3 V tn + 1 (see Note D) tn tn tn + 1 tw(CLK) tsu th CLR (see Note C) CLK (see Note E) Data Input (see Test Table) Output QH tPHL tPLH tPHL Serial input DATA INPUT FOR TEST OUTPUT TESTED (see Note B) 1.3 V 1.3 V 1.3 V tsu th 1.3 V 1.3 V 1.3 V 1.3 V NOTES: A. CL includes probe and jig capacitance. B. Propagation delay times (tPLH and tPHL) are measured at tn+1. Proper shifting of data is verified at tn+8 with a functional test. C. A clear pulse is applied prior to each test. D. tn = bit time before clocking transition, tn+1 = bit time after one clocking transition, and tn+8 = bit time after eight clocking transitions. E. The clock pulse has the following characteristics: tw(clock) ≤ 20 ns and PRR = 1 MHz. The clear pulse has the following characteristics: tw(clear) ≤ 20 ns. F. All pulse generators have the following characteristics: ZO ≈ 50 Ω; tr = tf = 2 ns. Duty cycle = 50% when testing fmax. 1.3 V Figure 1. Load Circuit and Voltage Waveforms |
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