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SN74F2245DWR Arkusz danych(PDF) 4 Page - Texas Instruments |
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SN74F2245DWR Arkusz danych(HTML) 4 Page - Texas Instruments |
4 / 11 page SN74F2245 25 Ω OCTAL BUS TRANSCEIVER WITH 3STATE OUTPUTS SDFS099 − MAY 1995 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 PARAMETER MEASUREMENT INFORMATION From Output Under Test Test Point R1 CL (see Note A) LOAD CIRCUIT FOR TOTEM-POLE OUTPUTS LOAD CIRCUIT FOR 3-STATE AND OPEN-COLLECTOR OUTPUTS R1 S1 7 V (tPZL, tPLZ) Open (all others) From Output Under Test Test Point R2 CL (see Note A) RL = R1 = R2 1.5 V 1.5 V 1.5 V 3 V 3 V 0 V 0 V th tsu VOLTAGE WAVEFORMS SETUP AND HOLD TIMES Timing Input (see Note C) Data Input (see Note C) 1.5 V 1.5 V 3 V 3 V 0 V 0 V High-Level Pulse (see Note C) Low-Level Pulse tw VOLTAGE WAVEFORMS PULSE DURATION 1.5 V 1.5 V tPHL tPLH tPLH tPHL Input (see Note C) Out-of-Phase Output (see Note E) 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 3 V 0 V VOL VOH VOH VOL In-Phase Output (see Note E) VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES (see Note D) tPHZ tPLZ 0.3 V tPZL tPZH 1.5 V 1.5 V 1.5 V 1.5 V 3 V 0 V Output Control (low-level enable) Waveform 1 (see Notes B and E) Waveform 2 (see Notes B and E) 0 V VOH VOL 3.5 V 0.3 V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS 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, tr = tf ≤ 2.5 ns, duty cycle = 50%. D. When measuring propagation delay times of 3-state outputs, switch S1 is open. E. The outputs are measured one at a time with one transition per measurement. Figure 1. Load Circuit and Voltage Waveforms |
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