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Microchip Technology AT49F001-55PC
- Part No.:
- AT49F001-55PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F001-55PC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,248
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Product details
Overview
AT49F001-55PC from Atmel is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 55 ns read access time, 10 µs typical byte programming, 10-second chip erase, hardware data protection, and sector-based architecture with 16K-byte boot block lockout. It is commonly deployed in firmware update-capable industrial controllers and legacy BIOS modules.
For engineers reviewing the AT49F001-55PC datasheet, AT49F001-55PC pinout, AT49F001-55PC application, or AT49F001-55PC equivalent, key selection considerations include its 5V-only operation, PLCC-32 package compatibility, boot-block write protection behavior, DATA polling/Toggle Bit status detection, and sector erase granularity across parameter and main memory blocks.
Technical Context
The AT49F001-55PC implements a standard parallel Flash interface with CE/OE/WE control logic and supports command-based operations including chip erase, sector erase, byte programming, and software product identification. Its internal program controller manages timing without external clocks, and the RESET pin enables system-level reset and - on non-N(T) variants - 12V override of boot block lockout.
Memory organization follows a fixed sector map: one 16K-byte boot block (00000H–03FFFH for AT49F001, distinct from AT49F001T), two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes). Erased bits default to logical "1", and programming only writes "0"; conversion back to "1" requires full sector or chip erase.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - directly replaces EPROMs in 8-bit bus systems. |
| Read Access Time | 55 ns max - enables direct interfacing with 12–18 MHz microcontrollers without wait states. |
| Byte Programming Time | 10 µs typical - supports fast field updates of small configuration or calibration data chunks. |
| Chip Erase Time | 10 seconds max - allows predictable firmware recovery cycles during manufacturing or service. |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware. |
| Boot Block Protection | 16K-byte region (00000H–03FFFH) with lockout enable via 6-cycle command sequence - secures bootloader code against accidental overwrite. |
| Power Dissipation | 275 mW active (50 mA @ 5V), <100 µA CMOS standby - suitable for low-power embedded systems with intermittent firmware access. |
Pinout & Package
AT49F001-55PC is supplied in a 32-lead Plastic Dual In-line Package (PDIP), 0.600" wide (package code 32P6), with standard through-hole mounting and JEDEC-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0 least significant bit. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path for read, program, and identification operations; high-impedance when deselected. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access. |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during shared-memory access. |
| WE | Write Enable | Active-low signal initiating command latching and programming/erase cycles; controls timing of bus cycles. |
| RESET | Reset Input | Active-low system reset; halts ongoing operations and forces high-Z outputs; 12V input enables boot block override (not available on N(T) variants). |
| VCC | Power Supply | +5V ±10% supply; internal voltage sensing disables programming if VCC <3.8V. |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal logic. |
| NC | No Connect | Pin 1 in DIP/PLCC packages - must remain unconnected per datasheet; not electrically bonded. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for +12V or +21V programming voltages - simplifies power design and enables in-system reprogramming via standard logic-level signals. |
| Sector Architecture with Boot Block Lockout | Enables secure bootloader storage (00000H–03FFFH) while permitting independent erase/program of parameter and main memory blocks - critical for fail-safe firmware updates. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line inhibition (OE low/CE high/WE high) prevent spurious writes during power transients or EMI events. |
| DATA Polling & Toggle Bit Status Monitoring | Allows host processor to poll I/O7 or I/O6 instead of using fixed timeouts - improves system responsiveness and reduces firmware complexity. |
| 10,000 Program/Erase Cycles | Guarantees long-term field reliability for applications requiring periodic configuration updates or logging over multi-year deployments. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Modules |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers with field-service requirements. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; 55 ns read access ensures real-time instruction fetch without CPU wait states. Use Value: Boot block lockout prevents corruption of core runtime engine during parameter block updates, enabling safe remote firmware patches. |
Use Scenario: Holding POST routines and system initialization code in desktop motherboard BIOS chips. IC Role / Device Role / Timing Role: Parallel Flash memory mapped into x86 I/O space; CE/OE/WE timing compatible with ISA bus cycle specifications. Use Value: Sector erase capability allows selective update of option ROMs without erasing boot code, reducing flash wear and update risk. |
| Embedded Instrumentation Calibration Data | Telecom Line Card Configuration |
Use Scenario: Retaining factory-calibrated sensor coefficients and user-adjusted offsets in portable test equipment. IC Role / Device Role / Timing Role: Parameter block (8K × 2) stores calibrated values; byte-programmable for per-unit fine-tuning post-manufacturing. Use Value: 10 µs byte programming enables rapid calibration write during production test, improving throughput versus page-program devices. |
Use Scenario: Storing protocol stack configuration, port mapping, and feature enable bits in modular telecom line cards. IC Role / Device Role / Timing Role: Main memory block (32K/64K) holds runtime-configurable tables; accessed via microcontroller's external memory interface. Use Value: Hardware data protection prevents inadvertent overwrite during hot-swap events or power glitches - essential for carrier-grade uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001MT-55EC | 3V/5V dual-voltage operation; 55 ns access; 1 Mbit; TSOP-32 package; no RESET pin; boot block at top (FF000H–FFFFFH) | Requires separate 3V supply rail; lacks RESET-driven boot override; incompatible sector map precludes drop-in replacement | Select only if system already uses 3V logic and board layout accommodates TSOP footprint and top-aligned boot block. |
| SST39VF010-55-4C-NHE | 3.3V-only operation; 55 ns access; 1 Mbit; PDIP-32; no RESET pin; uniform 4K sectors (no dedicated boot block) | Not 5V-tolerant; no hardware boot protection; requires firmware-managed sector locking; different command set | Choose when migrating to 3.3V systems and boot security is handled in software; verify command compatibility before layout reuse. |
Compared with AM29LV001MT-55EC and SST39VF010-55-4C-NHE, the AT49F001-55PC uniquely provides 5V-only simplicity, RESET-enabled boot override, and bottom-aligned 16K boot block - making it the only option for legacy 5V designs requiring hardware-enforced bootloader integrity.
Availability
AT49F001-55PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, embedded instrumentation calibration data, and telecom line card configuration requiring stable component supply across extended product lifecycles.
Supply support for AT49F001-55PC 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, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT49F001 series was designed as a 5V-only, in-system reprogrammable Flash memory family targeting cost-sensitive, pin-compatible replacements for UV-erasable EPROMs in legacy 8-bit embedded systems.
FAQ
What is the memory organization of the AT49F001-55PC?
The AT49F001-55PC contains 1 Mbit (131,072 × 8) of Flash memory organized as 128K words × 8 bits. Its sector architecture comprises one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes). This layout is fixed and matches the AT49F001 (not AT49F001T/N/T variants), and the AT49F001-55PC implements it in PDIP-32 packaging.
Does the AT49F001-55PC support 3.3V operation?
No, the AT49F001-55PC is strictly a 5V-only device. It requires VCC = 5V ±10% and does not support 3.3V or mixed-voltage operation. Programming, reading, and erase functions are all specified only at 5V, and internal voltage sensing disables writes if VCC drops below ~3.8V. For 3.3V systems, alternatives like SST39VF010 must be considered - but they are not pin- or command-compatible with the AT49F001-55PC.
How is boot block protection enabled on the AT49F001-55PC?
Boot block protection on the AT49F001-55PC is enabled via a six-cycle command sequence: load 0xAA to address 5555H, 0x55 to 2AAAH, 0x80 to 5555H, then 0xAA to 5555H, 0x55 to 2AAAH, and finally 0x40 to 5555H. Once activated, the 16K boot block (00000H–03FFFH) becomes permanently write-protected at ≤5.5V. The AT49F001-55PC supports RESET pin override at 12V to re-enable programming - a feature absent in AT49F001N(T) variants.
What package type is used for the AT49F001-55PC?
The AT49F001-55PC uses a 32-lead Plastic Dual In-line Package (PDIP), 0.600" wide (JEDEC MS-001 compliant), designated as package code 32P6. Pin 1 is marked by a notch or dot; pin 1 is NC (no connect) and must remain unconnected. This through-hole package is compatible with standard wave-solder and manual prototyping workflows, distinguishing it from PLCC (32J), TSOP (32T), or VSOP (32V) variants of the same base part.
Can the AT49F001-55PC be used as a direct replacement for EPROMs like the 27C010?
Yes, the AT49F001-55PC is functionally and pinout-compatible with 27C010 EPROMs in read mode: identical 32-pin DIP layout, same A0–A16 and I/O0–I/O7 signal assignments, and matching CE/OE/WE control timing. However, unlike UV-erasable EPROMs, the AT49F001-55PC supports in-system electrical erase/program via command sequences - eliminating the need for EPROM programmers or UV erasers, while retaining full read compatibility.
AT49F001-55PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49F001-55PC FAQ
1.How can I place an order for AT49F001-55PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001-55PC 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 AT49F001-55PC reliable?
The price and inventory of AT49F001-55PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001-55PC is usually 5 days.
3.What payment methods are accepted for AT49F001-55PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001-55PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001-55PC?
AT49F001-55PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001-55PC 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 AT49F001-55PC?
For technical support, including AT49F001-55PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001-55PC requirements.
6.How does Aetrix verify that AT49F001-55PC is sourced from the original manufacturer or authorized distributors?
All AT49F001-55PC 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 AT49F001-55PC meets industry standards.
7.What is the process for return or replacement of AT49F001-55PC?
All AT49F001-55PC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001-55PC, 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 AT49F001-55PC part is unused and in its original packaging.
Return procedure for AT49F001-55PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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