Datenblatt-Suchmaschine für elektronische Bauteile |
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SN74AS885 Datenblatt(PDF) 5 Page - Texas Instruments |
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SN74AS885 Datenblatt(HTML) 5 Page - Texas Instruments |
5 / 18 page SN54AS885, SN74AS885 8-BIT MAGNITUDE COMPARATORS SDAS236A – DECEMBER 1982 – REVISED JANUARY 1995 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 switching characteristics (see Figure 3) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX UNIT (INPUT) (OUTPUT) SN54AS885 SN74AS885 MIN TYP† MAX MIN TYP† MAX tPLH L/A P < QOUT, 2 8.5 14 1 8.5 13 ns tPHL L/A Q, P > QOUT 2 7.5 14 1 7.5 13 ns tPLH P < QIN, P < QOUT, 2 5 10 1 5 8 ns tPHL , P > QIN Q, P > QOUT 2 5.5 10 1 5.5 8 ns tPLH Any P or Q P < QOUT, 2 13.5 21 1 13.5 17.5 ns tPHL y data input Q, P > QOUT 2 10 17 1 10 15 ns † All typical values are at VCC = 5 V, TA = 25°C. APPLICATION INFORMATION The ′AS885 can be cascaded to compare words longer than eight bits. Figure 1 shows the comparison of two 32-bit words; however, the design is expandable to n bits. Figure 1 shows the optimum cascading arrangement for comparing words of 32 bits or greater. Typical delay times shown are at VCC = 5 V, TA = 25°C and use the standard advanced Schottky load of RL = 500 Ω, CL = 50 pF. Figure 2 shows the fastest cascading arrangement for comparing 16-bit or 24-bit words. Typical delay times shown are at VCC = 5 V, TA = 25°C and use the standard advanced Schottky load of RL = 500 Ω, CL= 50 pF. |
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