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AT49F001-12PI Datasheet(PDF) 2 Page - ATMEL Corporation |
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AT49F001-12PI Datasheet(HTML) 2 Page - ATMEL Corporation |
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2 / 16 page  AT49F001(N)(T) 2 When the device is deselected, the CMOS standby current is less than 100 µA. For the AT49F001NT pin 1 for the DIP and PLCC packages and pin 9 for the TSOP package are don’t connect pins. To allow for simple in-system reprogrammability, the AT49F001(N)(T) does not require high input voltages for programming. Five-volt-only commands determine the read and programming operation of the device. Reading data out of the device is similar to reading from an EPROM; it has standard CE, OE, and WE inputs to avoid bus conten- tion. Reprogramming the AT49F001(N)(T) is performed by erasing a block of data and then programming on a byte by byte basis. The byte programming time is a fast 50 µs. The end of a program cycle can be optionally detected by the DATA polling feature. Once the end of a byte program cycle has been detected, a new access for a read or pro- gram can begin. The typical number of program and erase cycles is in excess of 10,000 cycles. The device is erased by executing the erase command sequence; the device internally controls the erase opera- tions. There are two 8K byte parameter block sections and two main memory blocks. The device has the capability to protect the data in the boot block; this feature is enabled by a command sequence. The 16K-byte boot block section includes a reprogramming lock out feature to provide data integrity. The boot sector is designed to contain user secure code, and when the fea- ture is enabled, the boot sector is protected from being reprogrammed. In the AT49F001N(T), once the boot block programming lockout feature is enabled, the contents of the boot block ar e pe r mane nt and ca nnot b e chang ed. I n the AT49F001(T), once the boot block programming lockout feature is enabled, the contents of the boot block cannot be changed with input voltage levels of 5.5 volts or less. Block Diagram CONTROL LOGIC Y DECODER PARAMETER BLOCK 1 (8K BYTES) BOOT BLOCK (16K BYTES) OE WE CE RESET ADDRESS INPUTS VCC GND AT49F001(N)T DATA INPUTS/OUTPUTS I/O7 - I/O0 8 X DECODER PARAMETER BLOCK 2 (8K BYTES) MAIN MEMORY BLOCK 1 (32K BYTES) MAIN MEMORY BLOCK 2 (64K BYTES) PROGRAM DATA LATCHES Y-GATING INPUT/OUTPUT BUFFERS 1FFFF 1C000 1BFFF 1A000 19FFF 18000 17FFF 10000 0FFFF 00000 PARAMETER BLOCK 1 (8K BYTES) BOOT BLOCK (16K BYTES) AT49F001(N) DATA INPUTS/OUTPUTS I/O7 - I/O0 8 PARAMETER BLOCK 2 (8K BYTES) MAIN MEMORY BLOCK 1 (32K BYTES) MAIN MEMORY BLOCK 2 (64K BYTES) PROGRAM DATA LATCHES Y-GATING INPUT/OUTPUT BUFFERS 1FFFF 10000 0FFFF 08000 07FFF 06000 05FFF 04000 03FFF 00000 |
Similar Part No. - AT49F001-12PI |
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Similar Description - AT49F001-12PI |
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