1 - Al Kossow's Bitsavers

TMS256465,536-BIT ERASABLE PROGRAMMABLE READ-ONLY MEMORIESswitching characteristics over full ranges of recommended operating conditions (see Note 4)PARAMETERTEST CONDITIONS TMS2564-35 TMS2564-45(SEE NOTES 4 AND 5) MIN MAX MIN MAXtalA) Access time from address 350 450 nsAccess time from S1 and S2ta(S) CL = 100 pF, 120 120 ns(whichever occurs last)1 Series 54/74 TTL Loadta(PR) Access time from PD/PGM 350 450 nst r :520 ns,tv(A) Output data valid after address change0 0 nstf:520 nsOutput disable time from chip selecttdis(S)See Figure 1 0 100 O. 100 nsduring read only (whichever occurs last) ttdis(PR) Output disable time from PD/PGM during standbyi 0 100 0 100 nst All typical values are at T A = 25 DC and nominal voltages.t Value calculated from 0.5 volt delta to measured output level.recommended timing requirements for programming T A 25°C (see Note 4)UNITPARAMETERTMS2564MIN Typt MAXtw(PR) Pulse duration, program pulse 9 55 mstr(PR) Rise time, program pulse 5 nstf(PR) Fall time, program pulse 5 nstsu(A) Address setup time 2 p.stsu(D) Data setup time 2 p'stsu(VPP) Setup time from VPP 0 nsth(A) Address hold time 2 p'sth(D) Data hold time 2 p'sth(PR) Program pulse hold time 0 nsth(VPP) VPP hold time 2 p.st Typical values are at nominal voltages.NOTES: 4. Timing measurement reference levels: inputs 0.8 V and 2.2 V, outputs 0.65 V and 2.2 V. and Vpp during programming; 25 V ± 1 V.5. Common test conditions apply for tdis except during programming. For talA). ta(S). and tdis. PD/PGM = Vil'UNITenQ)CJ·SQ)c:Eoa:0..W84TEXASINSTRUMENTSPOST OFFICE BOX 225012 • DALLAS. TEXAS 752656-25