SMJS845A - MARCH 1997 - REVISED OCTOBER 1997
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The is an , single-supply, programmable read-only memory device that can be electrically erased and reprogrammed. This device is organized as , divided into the following sectors:
Any combination of sectors can be marked as read-only or erased. Full-chip erasure is also supported.
Sector data protection is afforded by methods that can disable any combination of sectors from write or read operations using standard programming equipment. An on-chip state machine provides an on-board algorithm that automatically pre-programs and erases any sector before it automatically programs and verifies program data at any specified address. The command set is compatible with the JEDEC 8M-bit electrically erasable, programmable read-only memory (EEPROM) command set. A suspend/resume feature allows access to unaltered memory blocks during a section-erase operation. All outputs of this device are TTL-compatible. Additionally, an erase/suspend/resume feature supports reading data from, or programming data to, a sector that is not being erased.
Device operations are selected by writing JEDEC-standard commands into the command register using standard microprocessor write timings. The command register acts as an input to an internal-state machine which interprets the commands, controls the erase and programming operations, outputs the status of the device, outputs the data stored in the device, and outputs the device algorithm-selection code. On initial power up, the device defaults to the read mode. A hardware-reset pin initializes the internal-state machine to the read operation.
The device has low power dissipation with a 40-mA active read for the byte mode, 60-mA typical program/erase current mode, and less than 100-uA standby current with a 5-uA deep-power-down mode. These devices are offered with 80-, 90-, 100-, and 120-ns access times. Table 1 and Table 2 show the sector-address ranges. The is offered in a 40-pin thin small-outline package (TSOP) (DCD suffix).
View more information about generic part numbers:TMS29F008B, TMS29F008T
Go to the Engineering Design Center to locate information on other TI Semiconductor devices.