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SN74ALS873B Datasheet(PDF) 7 Page - Texas Instruments |
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SN74ALS873B Datasheet(HTML) 7 Page - Texas Instruments |
7 / 8 page SN54ALS873B, SN54AS873A, SN74ALS873B, SN74AS873A DUAL 4-BIT D-TYPE LATCHES WITH 3-STATE OUTPUTS SDAS036D – APRIL 1982 – REVISED AUGUST 1995 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION tPHZ tPLZ tPHL tPLH 0.3 V tPZL tPZH TEST S1 Open Open Open tPHL tPZH tPZL Closed Open Closed tPHZ tPLZ tPLH tPHL LOAD CIRCUIT FOR 3-STATE OUTPUTS From Output Under Test Test Point R1 = 500 Ω S1 CL = 50 pF (see Note A) 7 V Open 1.3 V 1.3 V 1.3 V 3.5 V 3.5 V 0.3 V 0.3 V th tsu VOLTAGE WAVEFORMS SETUP AND HOLD TIMES Timing Input Data Input 1.3 V 1.3 V 3.5 V 3.5 V 0.3 V 0.3 V High-Level Pulse Low-Level Pulse tw VOLTAGE WAVEFORMS PULSE DURATION Input Out-of-Phase Output 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V 3.5 V 3.5 V 0.3 V 0.3 V VOL VOH VOH VOL Output Control Waveform 1 S1 Closed (see Note B) Waveform 2 S1 Open (see Note B) 0 V VOH VOL 3.5 V In-Phase Output 0.3 V tPLH 1.3 V 1.3 V VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS SWITCH POSITION TABLE R2 = 500 Ω NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr ≤ 2 ns, tf ≤ 2 ns. D. The outputs are measured one at a time with one transition per measurement. Figure 1. Load Circuit and Voltage Waveforms |
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