M28256 256K (32K x 8) PARALLEL EEPROM with SOFTWARE DATA PROTECTION DATA BRIEFING FAST ACCESS TIME: – 90ns at 5V – 150ns at 3V SINGLE SUPPLY VOLTAGE: – 5V ± 10% for M28256 – 2.7V to 3.6V for M28256-xxW LOW POWER CONSUMPTION FAST WRITE CYCLE: – 64 Bytes Page Write Operation – Byte or Page Write Cycle ENHANCED END of WRITE DETECTION: – Data Polling – Toggle Bit STATUS REGISTER HIGH RELIABILITY DOUBLE POLYSILICON, CMOS TECHNOLOGY: – Endurance >100,000 Erase/Write Cycles – Data Retention >10 Years JEDEC APPROVED BYTEWIDE PIN OUT ADDRESS and DATA LATCHED ON-CHIP SOFTWARE DATA PROTECTION 28 1 PDIP28 (BS) PLCC32 (KA) 28 1 SO28 (MS) 300 mils TSOP28 (NS) 8 x13.4mm Logic Diagram VCC DESCRIPTION The M28256 and M28256-Ware 32K x 8 low power Parallel EEPROM fabricated with SGS-THOMSON proprietary double polysilicon CMOS technology. Signal Names 15 8 A0-A14 W A0-A14 Address Input E DQ0-DQ7 Data Input / Output G W Write Enable E Chip Enable G Output Enable VCC Supply Voltage VSS Ground DQ0-DQ7 M28256 VSS AI01885 B28256/711 Complete data available on DATA-on-DISC CD-ROM or at www.st.com 1/3 M28256 1 28 2 27 3 26 4 25 5 24 6 23 7 22 M28256 8 21 9 20 10 19 11 18 12 17 13 16 14 15 VCC W A13 A8 A9 A11 G A10 E DQ7 DQ6 DQ5 DQ4 DQ3 A7 A12 A14 DU VCC W A13 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS LCC Pin Connections 1 32 A6 A5 A4 A3 A2 A1 A0 NC DQ0 9 M28256 25 A8 A9 A11 NC G A10 E DQ7 DQ6 17 DQ1 DQ2 VSS DU DQ3 DQ4 DQ5 DIP Pin Connections AI01886 AI01887 Warning: NC = Not Connected, DU = Don’t Use. SO Pin Connections A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS 1 2 3 4 5 6 7 M28256 8 9 10 11 12 13 14 TSOP Pin Connections 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC W A13 A8 A9 A11 G A10 E DQ7 DQ6 DQ5 DQ4 DQ3 G A11 A9 A8 A13 W VCC A14 A12 A7 A6 A5 A4 A3 22 28 1 7 21 M28256 15 14 8 AI01888 AI01889 2/3 A10 E DQ7 DQ6 DQ5 DQ4 DQ3 VSS DQ2 DQ1 DQ0 A0 A1 A2 M28256 ORDERING INFORMATION SCHEME Example: Speed M28256 – 15 Operating Voltage 90 (1) 90ns blank 4.5V to 5.5V 12 (1) 120ns W 2.7V to 3.6V 15 20 25 (2) W KA 6 Package BS PDIP28 KA PLCC32 150ns MS SO28 300 mils 200ns NS TSOP28 8 x 13.4mm 250ns T Temperature Range 1 (3) 6 0 to 70 °C –40 to 85 °C Option T Tape & Reel Packing Notes: 1. Not available for ”W” operating voltage. 2. Available for ”W” operating voltage only. 3. Temperature Range on request only. Devices are shipped from the factory with the memory content set at all ”1’s” (FFh). For a list of available options (Speed, Package, etc...) or for further information on any aspect of this device, please contact the SGS-THOMSON Sales Office nearest to you. 3/3
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