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TMS27PC256-1FML Datasheet(PDF) 4 Page - Texas Instruments |
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TMS27PC256-1FML Datasheet(HTML) 4 Page - Texas Instruments |
4 / 13 page TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES SMLS256H– SEPTEMBER 1984 – REVISED NOVEMBER 1997 4 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 initializing ( TMS27PC256 ) The one-time programmable TMS27PC256 PROM is provided with all bits in the logic high state, then logic lows are programmed into the desired locations. Logic lows programmed into an OTP PROM cannot be erased. SNAP! Pulse programming The 256K EPROM and OTP PROM are programmed using the TI SNAP! Pulse programming algorithm illustrated by the flowchart in Figure 1, which programs in a nominal time of four seconds. Actual programming time varies as a function of the programmer used. Data is presented in parallel (eight bits) on pins DQ0 to DQ7. Once addresses and data are stable, E is pulsed. The SNAP! Pulse programming algorithm uses initial pulses 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, G = VIH, and E = VIL. 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. program inhibit Programming can be inhibited by maintaining a high level input on the E pin. program verify Programmed bits can be verified with VPP = 13 V when G = VIL and E = 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. All other addresses must be held low. The signature code for these devices is 9704. A0 selects the manufacturer’s code 97 (Hex), and A0 high selects the device code 04, 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 0 0 0 0 0 1 0 0 04 † E = G = VIL, A9 = VH, A1–A8 = VIL, A10–A15 = VIL, VPP = VCC, PGM = VIH or VIL. |
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