1 - Al Kossow's Bitsavers

SMJ256465,536-BIT ERASABLE PROGRAMMABLE READ-ONLY MEMORIESswitching characteristics over full ranges of recommended operating conditions (see Note 4)PARAMETERTEST CONDITIONSSMJ2564(SEE NOTES 4 AND 5) MIN MAXtalA) Access time from address 450 nsAccess time from S 1 and S2ta(S)(whichever occurs last)CL = 100 pF. 150 ns1 Series 54/74 TTL Loadta(PR) Access time from PD/PGM450 nsttv(A) Output data valid after address changer :520 ns.0 nstf:520 nsOutput disable time from chip selecttdis(S)See Figure 1 0 100 nsduring read only (whichever occurs last):j:tdis(PR) Output disable time from PD/PGM during standby:!: 0 100 nst All typical values are at T C = 25°C and nominal voltages.t Value calculated from 0.5 volt delta to measured output level.recommended timing requirements for programming TC 25°C (see Note 4)UNITPARAMETERSMJ2564MIN 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 JlStsu(D) Data setup time 2 Jlstsu(VPP) Setup time from Vpp 0 nsth(A) Address hold time 2 Jlsth(D) Data hold time 2 JlSth(PR) Program pulse hold time 0 nsth(VPP) Vpp hold time 2 JlSt 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 V~ring programming = 25 V ± 1 V.5. Common test conditions apply for tdis except during programming. For talA). tarS). and tdis. PD/PGM = VIL.UNIT..t/)Q)(,)oSQ)C~oa:c..wTEXASINSTRUMENTSPOST OFFICE BOX 225012 • DALLAS. TEXAS 752656-27