AT29C020-90TI Microchip Integrated Circuit (Small Outline Packages) In Stock
AT29C020-90TI is a 2 Mbit (256 K x 8) parallel Flash memory with 90 ns access time, sector-erase architecture, and 5 V supply in a 32-pin TSOP package. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 32
- Lifecycle
- ACTIVE
- Datasheet
- AT29C020-90TI Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 2 Mbit (256 K x 8) parallel Flash with 90 ns read access time, enabling direct CPU bus attachment without wait states at typical 8-bit or 16-bit system clock speeds
- Sector-erase architecture allowing independent 256-byte sector updates without erasing the full array, reducing write cycle wear and update latency
- 5 V single-supply operation in a 32-pin TSOP package compatible with standard SMT assembly and legacy embedded system board footprints
Applications
AT29C020-90TI serves as program storage or data EEPROM replacement in legacy 8-bit and 16-bit embedded systems, industrial controllers, and networking equipment where a parallel-bus Flash with 90 ns access time integrates directly with the CPU data bus. Its sector-erase granularity of 256 bytes makes it suitable for field-firmware update applications where only partial code regions are modified during service. The TSOP-32 package is a compact upgrade from older DIP-32 EPROM footprints and is used in medical device memory expansions and communications protocol store designs.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the read access time and memory density of AT29C020-90TI, and which legacy bus systems can it attach to directly?
AT29C020-90TI provides a 90 ns read access time with 2 Mbit (256 K x 8) density, making it compatible with 8 MHz and slower 8-bit or 16-bit processor buses such as the Intel 8051, Zilog Z80, and Motorola 68HC11 families that typically require 100–150 ns memory cycle times. No external address latches are needed because the full 18-bit address bus is presented in parallel.
How does AT29C020-90TI's sector-erase architecture compare to page-erase Flash for firmware update use cases?
AT29C020-90TI erases and reprograms data in 256-byte sectors, allowing a field update to rewrite only the changed code pages rather than erasing the entire 256 KB array. Each sector write completes in under 10 ms, so a full 2 Mbit image update takes approximately 100 seconds at worst case, which is significantly shorter than the 60–120 second full-chip erase cycles of older EPROM-based memories.
Can AT29C020-90TI be used as a drop-in EPROM replacement on existing 32-pin DIP-footprint boards?
AT29C020-90TI is housed in a 32-pin TSOP package, not DIP-32, so it is not a direct through-hole drop-in. However, TSOP-32 to DIP-32 adapter boards are widely available for prototyping, and the pinout is compatible with 27C020 UV-EPROM standards. For new PCB designs, the TSOP-32 footprint saves approximately 50% board area compared to a DIP-32 socket and eliminates the UV-erase window required on ceramic EPROM packages.
What endurance and data retention specifications should engineers consider when using AT29C020-90TI for data logging?
AT29C020-90TI is rated for a minimum of 10,000 write cycles per sector and 10-year data retention at room temperature. For data-logging applications writing frequently to the same sector, this 10,000-cycle limit will be exhausted in fewer than 3 hours if each sector is written every second, so a wear-leveling scheme distributing writes across multiple 256-byte sectors is strongly recommended to reach the desired product service life.
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