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TMS27C240-10JL Datasheet(PDF) 5 Page - Texas Instruments |
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TMS27C240-10JL Datasheet(HTML) 5 Page - Texas Instruments |
5 / 15 page ![]() TMS27C240 262144 BY 16BIT UV ERASABLE TMS27PC240 262144 BY 16BIT PROGRAMMABLE READONLY MEMORIES SMLS240D− NOVEMBER 1990 − REVISED SEPTEMBER 1997 5 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 signature mode The signature mode provides access to a binary code identifying the manufacturer and type. This mode is activated when A9 ( pin 31 for the J package) 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 9730. A0 low selects the manufacturer’s code 97 ( Hex), and A0 high selects the device code 30 ( 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 0 0 1 1 0 0 0 0 30 † E = G = VIL, A9 = VH, A1−A8 = VIL, A10−A17 = VIL, VPP = VCC, PGM = VIH or VIL. |
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