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SN74AS856NT 数据表(PDF) 7 Page - Texas Instruments |
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SN74AS856NT 数据表(HTML) 7 Page - Texas Instruments |
7 / 9 page SN54AS856, SN74AS856 8BIT UNIVERSAL TRANSCEIVER PORT CONTROLLERS SDAS032A − DECEMBER 1983 − REVISED MARCH 1985 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 switching characteristics (see Note 1) VCC = 4.5 V to 5.5 V, CL = 50 pF, FROM TO R1 = 500 Ω, PARAMETER FROM (INPUT) TO (OUTPUT) R2 = 500 Ω, UNIT PARAMETER (INPUT) (OUTPUT) TA = MIN to MAX SN54AS856 SN74AS856 MIN MAX MIN MAX fmax 45 50 MHz tPLH Any B port Any A port 2 8 2 7 ns tPHL Any B port Any A port 2 10.5 2 9.5 ns tPLH ↑MODE Any A or B 2 8.5 2 7.5 ns tPHL ↑MODE port 5 20 5 19 ns tPLH ↓MODE † Any A or B 2 8.5 2 7.5 ns tPHL ↓MODE † port 2 9.5 2 8 ns tPLH CLK Any A or B 3 12 3 9 ns tPHL CLK port 3 12 3 11 ns tPLH CLK Q8 2 9 2 7.5 ns tPHL CLK Q8 2 10 2 9 ns tPHZ 2 9 2 7 ns tPLZ OEA or OEB Any A or B 2 12 2 9.5 ns tPZH OEA or OEB Any A or B port 2 8 2 7 ns tPZL port 2 11 2 10 ns † The positive transition of the MODE control will cause low-level data at the A output bus or stored in Q to be invalid for 12 ns. NOTE 1: Load circuit and voltage waveforms are shown in Section 1. |
类似零件编号 - SN74AS856NT |
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类似说明 - SN74AS856NT |
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