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                PRELIMINARY DATA
                June 1999
                This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
                M35080
                8 Kbit Serial SPI Bus EEPROM
                With Incremental Registers
                s
                Compatible with SPI Bus Serial Interface
                (Positive Clock SPI Modes)
                s
                Single Supply Voltage: 4.5V to 5.5V
                s
                5 MHz Clock Rate (maximum)
                s
                Sixteen 16-bit Incremental Registers
                s
                BYTE and PAGE WRITE (up to 32 Bytes)
                (except for the Incremental Registers)
                s
                Self-Timed Programming Cycle
                s
                Hardware Protection of the Status Register
                s
                Resizeable Read-Only EEPROM Area
                s
                Enhanced ESD Protection
                s
                1 Million Erase/Write Cycles (minimum)
                s
                40 Year Data Retention (minimum)
                DESCRIPTION
                The M35080 device consists of 1024x8 bits of low
                power EEPROM, fabricated with
                STMicroelectronics’ proprietary High Endurance
                Double Polysilicon CMOS technology.
                The device is accessed by a simple SPI-compati-
                ble serial interface. The bus signals consist of a
                serial clock input (C), a serial data input (D) and a
                serial data output (Q), as shown in Table 1.
                The device is selected when the chip select input
                (S
                ) is held low. Data is clocked in during the low to
                high transition of the clock, C. Data is clocked out
                during the high to low transition of the clock.
                Figure 1. Logic Diagram
                AI02143
                S
                VCC
                M35080
                VSS
                W
                Q
                C
                D
                Table 1. Signal Names
                CSerial Clock
                DSerial Data Input
                QSerial Data Output
                S
                Chip Select
                W
                Write Protect
                V
                CC
                Supply Voltage
                V
                SS
                Ground
                PSDIP8 (BN)
                0.25 mm frame
                SO8 (MN)
                150 mil width
                8
                1
                8
                1
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