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TMS27C256-25JE Datasheet(PDF) 9 Page - Texas Instruments |
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TMS27C256-25JE Datasheet(HTML) 9 Page - Texas Instruments |
9 / 13 page TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES SMLS256H– SEPTEMBER 1984 – REVISED NOVEMBER 1997 9 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 PARAMETER MEASUREMENT INFORMATION 2.08 V RL = 800 Ω Output Under Test CL = 100 pF (see Note A) NOTE A: CL includes probe and fixture capacitance. ac testing input / output wave forms 2.4 V 0.4 V 0.8 V 0.8 V 2 V 2 V AC testing inputs are driven at 2.4 V for logic high and 0.4 V for logic low. Timing measurements are made at 2 V for logic high and 0.8 V for logic low for both inputs and outputs. Figure 2. AC Testing Output Load Circuit A0 – A14 E Addresses Valid ta(E) G DQ0 – DQ7 Hi-Z ten(G) tv(A) tdis Output Valid VIH VIL VIH VIL VIH VIL VOH VOL Hi-Z ta(A) Figure 3. Read-Cycle Timing |
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