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Microchip Technology AT49F001A-55VI
- Part No.:
- AT49F001A-55VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F001A-55VI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,016
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Product details
Overview
AT49F001A-55VI from Atmel is a 1 Mbit (128K × 8) 5V-only in-system reprogrammable Flash memory with 55 ns read access time, 3-second chip erase cycle, 30 µs/byte programming, and hardware data protection including VCC sense and noise filtering. It features sector architecture with one 16K-byte boot block, two 8K-byte parameter blocks, and two main memory blocks (32K + 64K bytes), used in embedded system boot code storage and firmware update applications.
For engineers reviewing the AT49F001A-55VI datasheet, AT49F001A-55VI pinout, AT49F001A-55VI application, or AT49F001A-55VI equivalent, this page delivers verified technical context, real-world timing behavior, sector-level erase control logic, boot block lockout override via 12V RESET, and validated alternatives for industrial-grade Flash replacement.
Technical Context
The AT49F001A-55VI implements command-based Flash operation using standard microprocessor CE/OE/WE control lines-no high-voltage programming required. Its internal program control logic handles byte-by-byte programming and sector/chip erase autonomously, with DATA polling (I/O7 complement) and toggle bit (I/O6) for cycle completion detection.
It supports three operating modes: Read (CE+OE low, WE high), Program/Erase (CE low, OE high, WE low), and Standby (CE high). The RESET pin enables both reset-to-read-mode and 12V boot block override-though the latter is disabled on AN/T variants, confirming AT49F001A-55VI retains full RESET functionality per its -VI suffix and PLCC package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits-supports full BIOS or bootloader image storage in 8-bit bus systems. |
| Read Access Time | 55 ns max-guarantees compatibility with 18 MHz Z80, 80C51, or 68HC11 bus timing without wait states. |
| Byte Programming Time | 30 µs typical-enables field firmware patching at ~33 kB/s sustained write rate under burst conditions. |
| Chip Erase Time | 3 seconds max-allows full memory reset within deterministic time budget for production line reprogramming. |
| Boot Block Size & Protection | 16K bytes (00000H–03FFFH), programmable lockout enabled via 6-cycle command sequence-secures boot code against accidental overwrite. |
| Power Dissipation | 20 mA active current / 50 µA CMOS standby-meets industrial power budgets for always-on embedded controllers. |
| Endurance | 10,000 write/erase cycles-validated for firmware update cycles over 5+ years of field deployment. |
Pinout & Package
AT49F001A-55VI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package (JEDEC MS-016, Variation AE), 12.3–12.6 mm × 14.9–15.1 mm footprint, with pin 1 identifier corner and 0.102 mm max lead coplanarity. Pin 1 is functional (A7), not NC-distinguishing it from AT49F001AN(T) variants where pin 1 is no-connect.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 131,072-word addressing; A11 is don't-care in command cycles. |
| CE | Chip Enable | Active-low chip select-must be low with OE low for read; high forces high-impedance outputs and reduces current to 50 µA. |
| OE | Output Enable | Active-low output gate-used with CE to prevent bus contention; high disables outputs regardless of CE/WE state. |
| WE | Write Enable | Active-low write strobe-latches address/data during programming/erase; pulses <15 ns are filtered out to prevent noise-induced writes. |
| RESET | Reset & Override Control | Logic-high = normal operation; logic-low halts ongoing operations; 12V ±0.5V enables boot block reprogramming even when lockout is active. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface-carries data during read, command entry, and byte programming; supports DATA polling on I/O7 and toggle bit on I/O6. |
| GND / VCC | Power Supply | VCC = 5V ±10%; GND referenced for all inputs/outputs; VCC sense circuitry inhibits programming if voltage drops below 3.8V. |
| NC | No Connect | Pin 32 is NC-no internal connection; must be left unconnected or tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for 12V programming voltage-simplifies power design and enables direct integration with 5V microcontrollers. |
| Sector Architecture with Boot Lockout | Enables secure boot code storage (16K) while permitting independent erase/rewrite of parameter (2×8K) and main memory (32K+64K) blocks. |
| Hardware Data Protection | VCC sense, noise filtering (15 ns pulse rejection), and control-line interlock (OE low/CE high/WE high inhibits programming) prevent unintended writes. |
| DATA Polling & Toggle Bit | Allows software-driven end-of-program detection without timers-reduces host CPU overhead and improves firmware update reliability. |
| 12V RESET Override | Restores full reprogrammability of locked boot block via external 12V pulse-critical for recovery after corrupted firmware or security key updates. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot Loader |
|---|---|
|
Use Scenario: Storing boot firmware and configuration parameters in programmable logic controllers operating in harsh factory environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile boot memory providing immediate code execution on power-up; 55 ns access ensures deterministic startup timing. Use Value: Sector erase capability allows field updates to application firmware without disturbing protected boot loader, reducing downtime during maintenance. |
Use Scenario: Hosting initialization code for 8-bit microcontrollers (e.g., Z80, 8051) in medical diagnostic instruments requiring regulatory-compliant firmware integrity. IC Role / Device Role / Timing Role: Primary boot device holding secure startup routines; boot block lockout prevents unauthorized modification of safety-critical boot code. Use Value: 12V RESET override enables authorized service personnel to recover bricked units-meeting IEC 62304 software lifecycle requirements. |
| Automotive ECU Calibration Storage | Communications Equipment Parameter Memory |
|
Use Scenario: Retaining calibration tables and trim values in engine control units exposed to thermal cycling and electrical transients. IC Role / Device Role / Timing Role: Parameter block (2×8K) stores vehicle-specific tuning data; hardware write protection prevents corruption during ignition switching events. Use Value: 10,000 endurance cycles support lifetime recalibration across multiple vehicle service intervals without memory wear-out concerns. |
Use Scenario: Holding configuration profiles and protocol stacks in telecom base station management modules requiring hot-swap firmware updates. IC Role / Device Role / Timing Role: Main memory block (64K) stores modular firmware images; sector erase enables selective patching without full reload. Use Value: 3-second chip erase provides predictable update window for carrier-grade network uptime SLAs (e.g., <5 sec service interruption). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001MT-55REI | 3V core with 5V I/O tolerance; 55 ns access; 1 Mbit density; no 12V RESET override; boot block at top address (1F000H–1FFFFH). | Requires level-shifting for pure 5V systems; lacks hardware boot block recovery path-relies on software-only unlock sequences. | Select when migrating to lower-power 3.3V designs or when board already includes voltage translation. |
| SST39VF010-55-4C-NHE | 3.3V supply only; 55 ns access; 1 Mbit; sector-protect architecture; no RESET pin-protection controlled via software commands only. | Not pin-compatible; requires redesign of power and reset circuitry; no hardware-override mechanism for protected sectors. | Choose for cost-sensitive consumer applications where 3.3V operation and simplified reset logic are prioritized over field recovery capability. |
Compared with AM29LV001MT-55REI and SST39VF010-55-4C-NHE, the AT49F001A-55VI uniquely combines 5V-native operation, hardware-enforced boot block protection, and 12V RESET override-making it the only option among the three that guarantees field-recoverable secure boot in industrial 5V systems.
Availability
AT49F001A-55VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot loader, and automotive ECU calibration storage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT49F001A-55VI 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 security ICs, with a legacy of robust Flash technology for industrial and automotive applications.
The AT49F001A-55VI belongs to Atmel's early-generation 5V Flash memory product line, designed specifically for in-system reprogrammability in resource-constrained 8-bit embedded systems requiring deterministic timing and hardware-level data integrity.
FAQ
What is the function of the RESET pin on the AT49F001A-55VI?
The RESET pin on the AT49F001A-55VI serves dual functions: logic-low assertion halts ongoing program/erase operations and places outputs in high-impedance state, while a 12V ±0.5V pulse enables boot block reprogramming even when lockout is active. This hardware override is confirmed functional on the -VI (PLCC) variant, unlike AN/T versions where RESET is disabled.
Does the AT49F001A-55VI require external high-voltage circuitry for programming?
No, the AT49F001A-55VI operates exclusively from a single 5V supply for both read and programming functions. All command sequences-including byte programming, sector erase, and boot lockout-use standard 5V logic levels. Internal charge pumps generate necessary voltages, eliminating need for external 12V generators or voltage translators.
How is boot block protection implemented and verified on the AT49F001A-55VI?
Boot block protection on the AT49F001A-55VI is enabled via a six-cycle command sequence (555H/AAH → AAH/55H → 555H/80H → 555H/AAH → AAH/55H → 555H/40H). Status is verified by entering software product identification mode and reading I/O0 at address 00002H-low = unlocked, high = locked. This behavior is documented for the AT49F001A(N) variant, which includes AT49F001A-55VI.
What package type does the AT49F001A-55VI use, and how does it differ from AN/T variants?
The AT49F001A-55VI uses a 32-lead PLCC (32J) package with functional pin 1 (A7). In contrast, AT49F001AN(T) variants designate pin 1 as NC in PLCC and pin 9 as NC in TSOP/VSOP packages. This distinction confirms AT49F001A-55VI maintains full address bus connectivity and RESET functionality-critical for legacy system compatibility.
Can the AT49F001A-55VI be used in systems requiring faster than 55 ns access time?
No-the AT49F001A-55VI is rated for maximum 55 ns read access time (tACC) across the industrial temperature range (-40°C to +85°C). For sub-55 ns performance, engineers should select the AT49F001A-45VI variant (45 ns), which shares identical pinout, command set, and sector architecture but guarantees tighter timing.
AT49F001A-55VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49F001A-55VI FAQ
1.How can I place an order for AT49F001A-55VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001A-55VI 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 AT49F001A-55VI reliable?
The price and inventory of AT49F001A-55VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001A-55VI is usually 5 days.
3.What payment methods are accepted for AT49F001A-55VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001A-55VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001A-55VI?
AT49F001A-55VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001A-55VI 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 AT49F001A-55VI?
For technical support, including AT49F001A-55VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001A-55VI requirements.
6.How does Aetrix verify that AT49F001A-55VI is sourced from the original manufacturer or authorized distributors?
All AT49F001A-55VI 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 AT49F001A-55VI meets industry standards.
7.What is the process for return or replacement of AT49F001A-55VI?
All AT49F001A-55VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001A-55VI, 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 AT49F001A-55VI part is unused and in its original packaging.
Return procedure for AT49F001A-55VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001A-55VI Tags
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