Datenblatt-Suchmaschine für elektronische Bauteile |
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SN74ALS2238 Datenblatt(PDF) 10 Page - Texas Instruments |
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SN74ALS2238 Datenblatt(HTML) 10 Page - Texas Instruments |
10 / 11 page SN74ALS2238 32 × 9 × 2 ASYNCHRONOUS BIDIRECTIONAL FIRST IN, FIRST OUT MEMORY SDAS182 − APRIL 1990 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 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 7 V (see Note A) 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 (see Note B) 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 C) Waveform 2 S1 Open (see Note C) 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. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, Zo = 50 Ω, tr ≤ 2 ns, tf ≤ 2 ns. C. 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. D. The outputs are measured one at a time with one transition per measurement. Figure 2. Load Circuit and Voltage Waveforms |
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