Chandler, Ariz. - Microchip Technology Inc. and STMicroelectronics Inc. (Lexington, Mass.) have each introduced I2C serial E2PROMs, albeit for different markets.
Microchip's 256 x 8-bit, dual-mode 24LC22A and 24-LCS22A are among the first E2PROM chips to meet the Video Electronics Standards Association (VESA) enhanced extended display identifica-tion data (E-DID) 1.3 plug-and-play standard for use in high-end PC monitors, projectors and flat-panel displays. ST's M24M01, now its highest-density device, at 1 Mbit, targets cell phones, set-top boxes, "nomadic" applications and industrial systems that require high-density E2PROM.
Microchip's devices implement DDC1 and DDC2 operating modes, including recovery to DDC1, as defined by VESA. They also support the VESA E-EDID monitor specification for next-generation displays. Each includes an I2C-compatible, two-wire serial interface bus, offers ESD protection greater than 4,000 volts and operates from 2.5 to 5.5 V. The 24LCS22A also has a software-enabled hardware write protection pin that allows users to write-protect memory contents automatically during in-circuit or gang programming. Both parts come in standard eight-lead PDIP and SOIC packages and are in production. In quantities of 10,000, the 24LC22A is priced at 50 cents and the 24LCS22A sells for 55 cents.
ST's 1-Mbit, two-wire part is priced at $2 in quantities of 10,000. It supports 400-kHz protocol and-with chip-enable inputs (E0, E1, E2)-allows up to eight devices to be addressed on the same I2C bus. The device features sequential- and random-read operation and allows byte and page write of up to 128 bytes. Users can choose Vcc operating ranges of 1.8 to 3.6 V (M24M01-S) or 2.7 to 3.6 V (M24M01-V).
Other features include a -40 degrees to +85 degrees C temperature range, automatic address incrementing and self-timed programming cycle. The chip is available in a land-grid array package that is S08W-footprint compatible. The chip is fabricated in a CMOS process and offers minimum data retention of 40 years and guaranteed read/write endurance of 100,000 cycles. It is in production now.
Microchip Technology Inc.
EETInfo No. 604
EETInfo No. 605