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Microchip Technology AT29C020-12TC
- Part No.:
- AT29C020-12TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C020-12TC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,678
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Product details
Overview
AT29C020-12TC from Atmel is a 2-megabit (256K × 8) 5-volt-only Flash memory IC organized as 262,144 bytes, featuring 70 ns read access time, 10 ms sector program cycle time, 10,000 write/erase endurance, and dual 8K-byte boot blocks with independent programming lockout - used in embedded system firmware storage and BIOS code retention.
For engineers reviewing the AT29C020-12TC datasheet, AT29C020-12TC pinout, AT29C020-12TC application, or AT29C020-12TC equivalent, key selection considerations include its 120 ns maximum address-to-output delay (tACC), industrial temperature range (–40°C to +85°C), TSOP-32 package, sector-based reprogramming architecture, and hardware/software data protection mechanisms.
Technical Context
The AT29C020-12TC implements sector-erase-and-program architecture with 1024 sectors of 256 bytes each, internal address/data latches for full-sector buffering, and automatic internal erase-and-program sequencing triggered by WE/CE control. It supports both hardware- and software-initiated chip erase via 6-byte command sequences.
Its dual boot block lockout enables secure firmware partitioning: lower 8K (0x00000–0x01FFF) and upper 8K (0x3E000–0x3FFFF) blocks can be independently locked using a 7-command enable algorithm; once activated, lockout persists through power cycles and disables chip erase.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), sufficient for full BIOS or bootloader images in legacy x86 and microcontroller systems |
| Read Access Time (tACC) | 120 ns max - defines minimum clock period for reliable read timing in 8-bit parallel bus interfaces |
| Sector Program Time | 10 ms typical - determines firmware update latency per 256-byte sector during field reprogramming |
| Endurance | >10,000 program/erase cycles per sector - supports long-term field firmware updates without wear leveling |
| Supply Voltage | 5 V ±10% - eliminates need for external high-voltage programming supplies, simplifying system power design |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications including networking and automation equipment |
| Standby Current | 300 µA max (industrial) - enables low-power retention in battery-backed or energy-sensitive systems |
| Data Protection | Hardware (VCC sense, noise filter, CE/OE/WE inhibit) + software (3-byte unlock sequence) - prevents accidental writes during power-up/down or EMI events |
Pinout & Package
AT29C020-12TC is packaged in a 32-lead Thin Small Outline Package (TSOP, Type I, 8 × 20 mm, JEDEC MO-142 BD), pin-compatible with other AT29C020 variants in TSOP-32 format.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-byte addressing; A0–A7 select byte within sector, A8–A17 select sector |
| CE | Chip Enable | Active-low global enable; when high, device enters CMOS standby mode (≤300 µA); required low with OE low for read access |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention; must be high during programming |
| WE | Write Enable | Active-low programming control; initiates byte load or sector program; toggling within 150 µs enables multi-byte sector loading |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface for read data output and program data input; supports DATA polling on I/O7 and TOGGLE BIT detection on I/O6 |
| VCC | Power Supply | +5 V ±10% main supply; powers core logic and I/O drivers; VCC sense circuitry inhibits programming if voltage drops below ~3.8 V |
| GND | Ground Reference | Signal and power return path; decoupling capacitor placement near this pin critical for stable read/write timing |
| NC | No Connect | Unbonded pin in TSOP-32 layout; must remain unconnected to avoid signal integrity or thermal issues |
Key Features
| Feature | Design Value |
|---|---|
| Sector-based programming with internal latching | Loads 256 bytes into on-chip latch before auto-erase-and-program - frees host bus for concurrent operations during 10 ms programming window |
| Dual independent boot block lockout | Two 8K-byte regions (low and high address) can be permanently write-protected via 7-command sequence - secures boot code against corruption |
| DATA polling & TOGGLE BIT status detection | I/O7 complement indicates active programming; I/O6 toggling provides non-intrusive end-of-cycle detection - eliminates need for fixed delays or external timers |
| 5 V-only reprogramming | No external 12 V or 21 V programming voltage required - reduces BOM count and simplifies PCB layout for in-system updates |
| Hardware + software data protection | VCC monitoring, noise filtering, and 3-byte unlock sequence prevent spurious writes during power transitions or EMI - meets industrial reliability requirements |
| CMOS/TTL-compatible I/O | VIH = 2.0 V min, VOL = 0.45 V max at 2.1 mA - ensures interoperability with legacy 5 V microcontrollers, FPGAs, and ASICs without level shifters |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Retention |
|---|---|
|
Use Scenario: Storing firmware for programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-level update capability and hardware write protection to ensure runtime integrity. Use Value: 10,000-cycle endurance and –40°C to +85°C operation guarantee 10+ years of field updates without degradation; boot block lockout prevents accidental overwrite of startup routines. |
Use Scenario: Holding BIOS code in desktop motherboards and embedded x86 systems where compatibility with ISA/PCI legacy buses is required. IC Role / Device Role / Timing Role: Parallel-interface Flash ROM replacing EPROMs; accessed as memory-mapped device at fixed address space. Use Value: 120 ns tACC meets Intel 80486/Pentium bus timing; 5 V-only operation eliminates need for UV-erasable EPROM sockets or high-voltage programmers. |
| Network Router Bootloader | Medical Device Configuration Memory |
|
Use Scenario: Storing primary bootloader and fail-safe recovery image in enterprise routers requiring field-upgradable firmware with rollback capability. IC Role / Device Role / Timing Role: Dual-boot-block architecture stores primary and backup images; lockout ensures one copy remains immutable during update. Use Value: Independent lockout of lower and upper 8K blocks allows atomic firmware swaps; DATA polling enables precise timing control during remote OTA updates. |
Use Scenario: Retaining calibrated sensor parameters and safety-critical configuration data in Class II medical instruments subject to regulatory audit. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory with verifiable write protection activated at manufacturing test. Use Value: Software data protection (3-byte unlock) plus hardware VCC-sense inhibition satisfies IEC 62304 traceability requirements for write operations; 300 µA standby current supports battery backup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF200A-70-4C-NHE | 4 Mbit density, 70 ns access, 3.3 V supply only; no boot block lockout; supports CFI query mode | Requires 3.3 V system rail; lacks dedicated boot protection; suited for higher-density, lower-voltage designs | Select when migrating to 3.3 V platforms and needing larger capacity; not drop-in due to voltage and protection differences |
| MX29LV200CTTI-70G | 2 Mbit, 5 V tolerant I/O but 3 V core; 70 ns access; includes single 16K boot block (not dual); supports AMD-style command set | Lower active power (25 mA vs 40 mA); boot block size differs; requires 3 V VCC with 5 V-tolerant pins | Choose for reduced power consumption and compatibility with 3 V microcontrollers; verify boot block mapping matches AT29C020-12TC's dual 8K layout |
Compared with SST39VF200A-70-4C-NHE and MX29LV200CTTI-70G, the AT29C020-12TC uniquely delivers industrial-temp 5 V-only operation with independently lockable dual 8K boot blocks - making it irreplaceable in legacy 5 V systems requiring certified firmware partitioning and zero-voltage-programming simplicity.
Availability
AT29C020-12TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS retention, network router bootloader deployment, medical device configuration memory, and embedded controller code storage requiring stable component supply across extended product lifecycles.
Supply support for AT29C020-12TC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication devices for industrial, automotive, and consumer applications.
The AT29C020-12TC belongs to Atmel's legacy parallel Flash memory product line, designed specifically for 5 V embedded systems requiring in-system reprogrammability, robust data retention, and hardware-enforced write protection without external high-voltage circuitry.
FAQ
What is the maximum operating temperature range for the AT29C020-12TC?
The AT29C020-12TC is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table of the official datasheet (Rev. 0291N), where the "-12" speed grade suffix denotes the 120 ns tACC timing and "I" suffix indicates industrial qualification - explicitly matched to the "AT29C020-12TI" and "AT29C020-12JI" ordering codes in the Ordering Information section.
Does the AT29C020-12TC support sector erase only, or can the entire chip be erased?
Yes, the AT29C020-12TC supports both sector erase and full-chip erase. Sector erase is the default mode - 1024 sectors of 256 bytes each can be individually erased and programmed. Full-chip erase is enabled via a documented 6-byte software command sequence (AAh → 55h → 80h → AAh → 55h → 10h), as detailed in the "Optional Chip Erase Mode" section of the datasheet.
How does the boot block lockout feature work on the AT29C020-12TC?
The AT29C020-12TC contains two dedicated 8K-byte boot blocks: one at addresses 0x00000–0x01FFF (lower) and another at 0x3E000–0x3FFFF (upper). Each can be independently locked using a 7-command software algorithm. Once locked, that block becomes permanently read-only - no erasure or programming is possible, and chip erase is disabled if either block is locked. Status is verified by reading address 00002H (lower) or 3FFF2H (upper).
What package type is used for the AT29C020-12TC?
The AT29C020-12TC uses a 32-lead Thin Small Outline Package (TSOP), designated as "32T" in Atmel's ordering nomenclature. Its mechanical dimensions conform to JEDEC MO-142, Variation BD: 8 mm × 20 mm body, 0.5 mm lead pitch, and Type I pin layout - confirmed in the "Ordering Information" and "Packaging Information" sections (pages 13–16) of the datasheet.
Can the AT29C020-12TC be used as a direct replacement for EPROMs like the 27C020?
Yes, the AT29C020-12TC is functionally compatible with 27C020 EPROMs in read mode: identical 256K × 8 organization, same pinout (TSOP-32), and EPROM-like access protocol (CE/OE/WE control). However, it adds in-system reprogrammability without UV erasure or external programming voltages - enabling field firmware updates impossible with one-time-programmable EPROMs.
AT29C020-12TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT29C020-12TC FAQ
1.How can I place an order for AT29C020-12TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-12TC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT29C020-12TC reliable?
The price and inventory of AT29C020-12TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-12TC is usually 5 days.
3.What payment methods are accepted for AT29C020-12TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-12TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-12TC?
AT29C020-12TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-12TC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT29C020-12TC?
For technical support, including AT29C020-12TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-12TC requirements.
6.How does Aetrix verify that AT29C020-12TC is sourced from the original manufacturer or authorized distributors?
All AT29C020-12TC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT29C020-12TC meets industry standards.
7.What is the process for return or replacement of AT29C020-12TC?
All AT29C020-12TC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-12TC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT29C020-12TC part is unused and in its original packaging.
Return procedure for AT29C020-12TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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