M27W256

M27W256 256 Kbit (32Kb x 8) Low Voltage UV EPROM and OTP EPROM Features ■ 2.7V to 3.6V Supply Voltage in Read Operation ■ Access Time: – 70 ns at VCC = 3.0V to 3.6V t(s) – 80 ns at VCC = 2.7V to 3.6V ■ Pin Compatible with M27C256B uc ■ Low Power Consumption: d – 15 µA Max. Standby Current ro ) – 15 mA Max. Active Current at 5 MHz P t(s ■ Programming Time 100 µs/byte lete uc ■ High Reliability CMOS Technology d – 2,000V ESD Protection so ro – 200 mA Latchup Protection Immunity b P ■ Electronic Signature - O te – Manufacturer Code: 20h ) le – Device Code: 3dh OObbssoolleettee PPrroodduucctt((ss) - Obso ■ ECOPACK® packages available 28 1 FDIP28W (F) 28 1 PDIP28 (B) PLCC32 (K) TSOP28 (N) 8 x 13.4 mm April 2006 Rev 3 1/23 www.st.com 1 Contents Contents M27W256 1 Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Read mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 Two-line output control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.4 System considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 t(s) 2.5 Programming . . . . . . . . . . . . . . . . . ....