Details

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BUY AT29C040A-12TC https://www.utsource.net/itm/p/12398911.html

Parameter	Description
Device Type	512K x 8-bit Flash Memory
Manufacturer	Atmel (now part of Microchip Technology)
Package Type	40-Pin Plastic Dual Inline Package (PDIP), 44-Pin Thin Small Outline Package (TSOP)
Operating Voltage (Vcc)	2.7V to 6.0V
Programming Voltage (Vpp)	Same as Vcc, no separate programming voltage required
Access Time	120ns (for -12TC suffix)
Endurance	10,000 Program/Erase Cycles
Data Retention	20 years at 85°C
Temperature Range	Commercial: 0°C to +70°C, Industrial: -40°C to +85°C
Organization	512K x 8 bits
Block Structure	Uniform sector organization with 8 sectors of 64K bits each
Features	Auto Select Programming Mode, Sector Protection

Instructions for AT29C040A-12TC

1. Power Supply Connection

   • Connect Vcc to the positive power supply (2.7V to 6.0V).
   • Connect GND to the ground.

2. Address Lines

   • Connect address lines A0-A18 to select the memory location you wish to access.

3. Data Lines

   • Connect data lines D0-D7 to the microcontroller or processor data bus.

4. Control Signals

   • OE (Output Enable): Low active signal to enable reading from the device.
   • WE (Write Enable): Low active signal used in conjunction with CE and OE during write operations.
   • CE (Chip Enable): Low active signal to enable the chip.

5. Programming Mode

   • To enter programming mode, apply the correct sequence of signals on the control lines as specified in the datasheet.
   • Ensure that the programming voltage (if required) is applied correctly.

6. Sector Protection

   • The device supports sector protection which can be enabled by writing specific values to designated addresses.

7. Auto Select Programming Mode

   • The device automatically selects between byte program, block erase, and read modes based on the input sequence.

8. Erase Operations

   • Perform a sector erase by applying the appropriate command sequence to the control lines and providing the sector address.

9. Read Operations

   • To read data, ensure CE and OE are low, then provide the address and read the data from the data lines.

10. Handling Precautions

    • Avoid exposing the device to voltages outside the specified operating range.
    • Use proper ESD precautions when handling the device.

Refer to the detailed datasheet for timing diagrams and exact command sequences for various operations.

(For reference only)