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TMS27C210A-15JL Datasheet(PDF) 4 Page - Texas Instruments |
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TMS27C210A-15JL Datasheet(HTML) 4 Page - Texas Instruments |
4 / 29 page TMS27C210A 65536 BY 16BIT UV ERASABLE TMS27PC210A 65536 BY 16BIT PROGRAMMABLE READONLY MEMORIES SMLS310D− NOVEMBER 1990 − REVISED SEPTEMBER 1997 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 SNAP! Pulse programming The TMS27C210A and TMS27PC210A are programmed using the TI SNAP! Pulse programming algorithm (shown in the flow chart in Figure 1), which can program in a nominal time of seven seconds. Actual programming time varies as a function of the programmer used. The SNAP! Pulse programming algorithm uses an initial pulse of 100 microseconds ( µs) followed by a byte verification to determine when the addressed byte has been successfully programmed. Up to 10 (ten) 100- µs pulses per byte are provided before a failure is recognized. The programming mode is achieved when VPP = 13 V, VCC = 6.5 V, E = VIL, G = VIH. Data is presented in parallel (16 bits) on pins DQ0 through DQ15. Once addresses and data are stable, PGM is pulsed low. More than one device can be programmed when the devices are connected in parallel. Locations can be programmed in any order. When the SNAP! Pulse programming routine is complete, all bits are verified with VCC = VPP = 5 V ± 10%. program inhibit Programming can be inhibited by maintaining a high level input on the E or PGM pins. program verify Programmed bits can be verified with VPP = 13 V when G = VIL, E = VIL, and PGM = VIH. signature mode The signature mode provides access to a binary code identifying the manufacturer and type. This mode is activated when A9 is forced to 12 V. Two identifier bytes are accessed by toggling A0. DQ0 −DQ7 contain the valid codes. All other addresses must be held low. The signature code for these devices is 97AB. A0 low selects the manufacturer’s code 97 ( Hex), and A0 high selects the device code AB (Hex), as shown in Table 3. Table 3. Signature Mode IDENTIFIER† PINS IDENTIFIER† A0 DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 HEX Manufacturer Code VIL 1 0 0 1 0 1 1 1 97 Device Code VIH 1 0 1 0 1 0 1 1 AB † E = G = VIL, A9 = VH, A1−A8 = VIL, A10−A15 = VIL, VPP = VCC, PGM = VIH or VIL. |
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