Catalyst Semiconductor CAT28C257 free download

File name 28C257.pdf

CAT28C257 256K-Bit CMOS PARALLEL EEPROM FEATURES s Fast read access times: 120/150 ns s Low power CMOS dissipation: s Automatic page write operation: ­Active: 25 mA max. ­Standby: 150 µA max. s Simple write operation: ­1 to 128 Bytes in 5ms ­Page load timer s End of write detection: ­On-chip address and data latches ­Self-timed write cycle with auto-clear s Fast write cycle time: ­Toggle bit DATA ­DATA polling s Hardware and software write protection s 100,000 Program/erase cycles s 100 Year data retention s Commercial, industrial and automotive ­5ms max s CMOS and TTL compatible I/O temperature ranges DESCRIPTION The CAT28C257 is a fast, low power, 5V-only CMOS Parallel EEPROM organized as 32K x 8-bits. It requires a simple interface for in-system programming. On-chip address and data latches, self-timed write cycle with autoclear and VCC power up/down write protection eliminate additional timing and protection hardware. DATA Polling and Toggle status bits signal the start and end of the selftimed write cycle. Additionally, the CAT28C257 features hardware and software write protection. The CAT28C257 is manufactured using Catalyst's advanced CMOS floating gate technology. It is designed to endure 100,000 program/erase cycles and has a data retention of 100 years. The device is available in JEDEC approved 28-pin DIP or 32-pin PLCC packages. BLOCK DIAGRAM 32,768 x 8 E2PROM ARRAY 128 BYTE PAGE REGISTER A7­A14 ADDR. BUFFER & LATCHES INADVERTENT WRITE PROTECTION ROW DECODER VCC HIGH VOLTAGE GENERATOR CE OE WE CONTROL LOGIC I/O BUFFERS TIMER DATA POLLING AND TOGGLE BIT COLUMN DECODER 5096 FHD F02 I/O0­I/O7 A0­A6 ADDR. BUFFER & LATCHES © 2002 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. 1015, Rev. B CAT28C257 PIN CONFIGURATION DIP Package (P) A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 I/O0 I/O1 I/O2 VSS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC WE A13 A8 A9 A11 OE A10 CE I/O7 I/O6 I/O5 I/O4 I/O3 PLCC Package (N) A7 A12 A14 NC VCC WE A13 4 3 2 1 32 31 30 A6 A5 A4 A3 A2 A1 A0 NC I/O0 5 6 7 8 29 28 27 26 A8 A9 A11 NC OE A10 CE I/O7 I/O6 9 25 10 24 11 23 12 22 13 21 14 15 16 17 18 19 20 I/O1 I/O2 VSS NC I/O3 I/O4 I/O5 5096 FHD F01 PIN FUNCTIONS Pin Name A0­A14 I/O0­I/O7 CE OE Function Address Inputs Data Inputs/Outputs Chip Enable Output Enable Pin Name WE VCC VSS NC Function Write Enable 5V Supply Ground No Connect Doc. No. 1015, Rev. B 2 CAT28C257 ABSOLUTE MAXIMUM RATINGS* Temperature Under Bias ... -55°C to +125°C Storage Temperature ... -65°C to +150°C Voltage on Any Pin with Respect to Ground(2) ... -2.0V to +VCC + 2.0V VCC with Respect to Ground ... -2.0V to +7.0V Package Power Dissipation Capability (Ta = 25°C) ... 1.0W Lead Soldering Temperature (10 secs) ... 300°C Output Short Circuit Current(3) ... 100 mA RELIABILITY CHARACTER