1 - Al Kossow's Bitsavers

TMS270B, TMS27LOBSMJ270B, SMJ27LOB1024·WORD BY B·BIT ERASABLE PROGRAMMABLE READ·ONLY MEMORIESProgramming continues in this manner until all words have been programmed. This constitutes one of N program loops.The entire sequence is then repeated N times with N x tw(PR} 2: 100 ms. Thus, if tw(PR} = 1 ms; then N = 100,the minimum number of program loops required to program the EPROM.to stop programmingAfter cycling through the N program loops, the last program pulse is brought to 0 V, then Program Enable [5 (PE)]is brought to VIL which takes the device out of the program mode. The data supplied by the programmer must beremoved before the address is changed since the program inputs are now data outputs and change of address couldcause a voltage conflict' on the output buffer. 01-08 outputs are invalid up to 10 microseconds after the programenable pin is brought from VIH(PE} to VIL.logic symbol tAO 0EPROM 1024x8(9)A\l(10) 01A\l(11) 02A\l(13) 03A_ O _ A\l1023 (14) 04A\l 05A\l(15)06A\l 07A\l 08tThis symbol is in accordance with IEEE Std 91/ANSI Y32.14 and recent decisions in IEEE and IEC. See explanation on page 10-1.absolute maximum ratings over operating free-air temperature range (unless otherwise noted):t:Supply voltage, VBB (see Note 1) ...........................................'. . .. - 0.3 V to 7 VSupply voltage, Vee (see Note 1) ............................................. , -0.3 V to 15 VSupply voltage, VDD (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. - 0.3 V to 20 VSupply voltage, VSS (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. - 0.3 V to 15 VAll input voltage (except program) (see Note 1) ................................... , - 0.3 V to 20 VProgram input (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. - 0.3 V to 35 VOutput voltage (operating, with respect to VSS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. -2 V to 7 VOperating free-air temperature range: TMS' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . oDe to 70 0 eOperating case temperature range: SMJ' ...................................... , - 65°C to 150 DeStorage temperature range ................................................. , - 55 DC to 125 DC(/)Q)(.)'S;Q)C~oa:a..wt Stresses beyond those listed under" Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functionaloperation of the device at these or any other conditions beyond those indicated in the "Recommended Operating Conditions" section of this specificationis not implied. Exposure to absolute-maxi mum-rated conditions for extended periods may affect device reliability.NOTE 1: Under absolute maximum ratings, voltage values are with respect to the most-negative supply voltage. VSS (substrate), unless otherwise noted.Throughout the remainder of this data sheet, voltage values are with respect to VSS.TEXASINSTRUMENTSPOST OFFICE BOX 225012 • DALLAS. TEXAS 752656-33