AT49F002T-12TC

Memory IC Overview

The AT49F002T-12TC is a 5-volt only in-system reprogrammable Flash memory with a capacity of 2 megabits (256K x 8). It features a fast read access time of 120 ns and operates within the commercial temperature range of 0°C to 70°C. The device utilizes a parallel interface and is housed in a 32-lead Plastic Thin Small Outline Package (TSOP) measuring 8 x 20 mm. Active current consumption is typically 50 mA, while CMOS standby current is 100 µA.

Memory IC Feature Summary

• Sector architecture includes one 16K byte boot block with programming lockout, two 8K byte parameter blocks, and two main memory blocks.
• Hardware data protection prevents inadvertent programming through VCC sense, program inhibit, and noise filtering.
• Internal program control and timer manage erase and program cycles without external clocks.
• DATA polling and toggle bit features provide detection for the end of program or erase cycles.

Memory IC Applications

• In-system reprogrammable storage for embedded systems
• Secure code storage utilizing the boot block lockout feature
• Parameter storage in industrial applications

Memory IC Procurement Notes

Verify that the component matches the specific AT49F002T-12TC designation, ensuring the 'T' suffix indicates the TSOP package and '12' denotes the 120 ns speed grade. Confirm the manufacturer origin as Atmel or Microchip Technology. Check datasheet revisions for any updates regarding absolute maximum ratings or command sequences before integration.

Memory IC Selection Notes

Select this part when a 5-volt supply is available and a 2-megabit nonvolatile memory solution is required. The 120 ns access time suits standard microprocessor interfaces. Consider the sector layout if distinct regions for boot code and parameters are needed. Ensure the system design accommodates the 50 mA active current draw during operations.

Memory IC Part Context

This component belongs to the AT49F002 family of 5-volt Flash memories manufactured by Atmel, now part of Microchip Technology. The family offers various speed grades and package options, including PLCC, PDIP, TSOP, and VSOP. The AT49F002T variant specifically refers to the TSOP package configuration.

Memory IC Replacement Considerations

Compatible substitutes include other AT49F002 variants with different speed grades such as AT49F002T-55TC or AT49F002T-70TC, provided the timing requirements allow for slower access times. Cross-family replacements require verification of pin compatibility and voltage levels.

Memory IC FAQ

How is the boot block programming lockout feature enabled?

The feature is enabled by executing a specific six-command sequence involving loading data AA to address 5555, data 55 to address 2AAA, data 80 to address 5555, data AA to address 5555, data 55 to address 2AAA, and finally data 40 to address 5555.

What happens if the RESET pin is pulled high during a program cycle?

A low level on the RESET pin halts the present device operation and puts the outputs in a high impedance state. If asserted during a program or erase operation, the operation may not complete successfully and must be repeated after the pin returns to a high level.