M27C256B

M27C256B 256 Kbit (32Kb × 8) UV EPROM and OTP EPROM Feature summary ■ 5V ± 10% supply voltage in Read operation ■ Access time: 45ns ■ Low power consumption: – Active Current 30mA at 5MHz – Standby Current 100µA ■ Programming voltage: 12.75V ± 0.25V ■ Programming time: 100µs/Word ■ Electronic signature – Manufacturer Code: 20h – Device Code: 8Dh ■ ECOPACK® packages available 28 1 FDIP28W (F) 28 1 PDIP28 (B) PLCC32 (C) May 2006 Rev 2 1/24 www.st.com 1 Contents Contents M27C256B 1 Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Device operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Read mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 Two-line output control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.4 System considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.5 Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6 PRESTO II programming algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.7 Program inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.8 Program Verify . . . . . ....