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Microchip Technology AT28C256F-15FM/883
- Part No.:
- AT28C256F-15FM/883
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-CFlatPack
- Datasheet:
-
AT28C256F-15FM/883.pdf
- Description:
- IC EEPROM 256KBIT PAR 28FLATPK
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT28C256F-15FM/883 from Microchip Technology is a military-grade 256-Kbit (32,768 × 8) paged parallel EEPROM with 150 ns read access time, 3 ms maximum page write cycle time, and JEDEC-approved byte-wide pinout. It operates across –55°C to +125°C, supports hardware/software data protection, and delivers 300 µA CMOS standby current for embedded avionics and defense systems requiring nonvolatile memory with high reliability and radiation-tolerant packaging.
For engineers reviewing the AT28C256F-15FM/883 datasheet, AT28C256F-15FM/883 pinout, AT28C256F-15FM/883 application, or AT28C256F-15FM/883 equivalent, this page provides verified military-spec electrical parameters, MIL-STD-883-compliant package details (32-lead flatpack), page-write timing constraints, DATA Polling and Toggle Bit end-of-write detection methods, and validated alternatives for legacy system sustainment and redesign.
Technical Context
The AT28C256F-15FM/883 implements a paged architecture with an internal 64-byte latch enabling simultaneous writes of 1–64 bytes within a single page defined by address bits A6–A14. Its dual-line chip enable (CE) and output enable (OE) control prevents bus contention during read cycles, while write initiation requires precise WE/CE timing per MIL-STD-883 test conditions.
It features VCC-sense write inhibition below 3.8 V, 5 ms power-on delay before write enable, and noise filtering rejecting <15 ns pulses on CE/WE. The device includes 64 bytes of dedicated identification EEPROM accessible via A9 = 12 V and supports optional software chip erase using a 6-byte command sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8) - supports full 16-bit address space with byte-level random access |
| Read Access Time | 150 ns max - enables direct replacement of SRAM in legacy MIL-STD-1553 or FPGA configuration circuits |
| Page Write Cycle Time | 3 ms max - reduces firmware update latency vs. 10 ms standard variant (AT28C256-15) |
| Endurance | 10,000 write/erase cycles - qualified per MIL-STD-883 Method 1032 for sustained field operation |
| Data Retention | 10 years at +125°C - validated under accelerated life testing for airborne mission-critical storage |
| Supply Voltage | 5 V ± 10% - compatible with legacy TTL/CMOS logic rails without level-shifting circuitry |
| Operating Temperature | –55°C to +125°C - meets MIL-PRF-38535 Class B screening requirements |
Pinout & Package
AT28C256F-15FM/883 is supplied in a 32-lead ceramic flatpack (MIL-STD-1835 F-12 Config B), hermetically sealed and tested to MIL-STD-883 requirements. Pin 1 is marked with a notch or dot; pins are numbered counterclockwise from pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32,768-word addressing; A6–A14 define page boundaries for 64-byte writes |
| I/O0–I/O7 | Bidirectional Data Bus | CMOS/TTL-compatible 8-bit data path; I/O7 used for DATA Polling, I/O6 for Toggle Bit end-of-write detection |
| CE | Chip Enable | Active-low primary selection signal; must be low with OE low and WE high for read access |
| OE | Output Enable | Active-low output gate; high-Z state when high, enabling bus sharing in multi-device systems |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data; must meet tWP ≥ 100 ns pulse width |
| VCC | Power Supply | +5 V ± 10% supply; internal VCC-sense circuit inhibits writes if voltage drops below 3.8 V |
| GND | Ground Reference | Signal and power ground reference; decoupling capacitor required per MIL-STD-883 requirement |
| NC / DC | No Connect / Don't Connect | Pins 1 and 17 in CLCC; not bonded - must remain unconnected to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Architecture | 64-byte internal latch enables burst programming without external address sequencing - cuts firmware update time by 98% vs. byte-by-byte writes |
| DATA Polling & Toggle Bit | Dual asynchronous write completion detection: I/O7 returns complemented data until write ends; I/O6 toggles until final state - eliminates need for fixed delay timers |
| Hardware Write Protection | VCC-sense, 5 ms power-on delay, and noise filtering (<15 ns rejection) prevent spurious writes during power transients in aircraft electrical systems |
| Software Data Protection (SDP) | Three-byte unlock sequence (AAh/55h/A0h) enables/disables write protection - preserves configuration integrity during field reprogramming |
| MIL-STD-883 Qualified Packaging | 32-lead flatpack meets Method 2017 thermal shock, Method 2002 internal visual, and Method 2031 seal tests - certified for Class B space-qualified applications |
Applications
| Avionics Flight Control Memory | Tactical Radio Firmware Storage |
|---|---|
|
Use Scenario: Storing real-time flight parameter calibration tables and fail-safe control algorithms in F-16 digital flight control computers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to MIL-STD-1553B host processor; accessed as static RAM with 150 ns read timing. Use Value: Eliminates battery-backed SRAM; retains critical flight data through full aircraft power cycling and EMI events per DO-160 Section 20. |
Use Scenario: Holding encrypted waveform definitions and channel mapping tables in AN/PRC-160(V) manpack radios operating in contested EM environments. IC Role / Device Role / Timing Role: Secure firmware repository with software data protection enabled; page writes complete in ≤3 ms during over-the-air updates. Use Value: Prevents unauthorized reprogramming via SDP lock; 10,000-cycle endurance supports 15+ year field service life without replacement. |
| Missile Guidance System NVM | Naval Sonar Signal Processing |
|
Use Scenario: Storing target acquisition profiles and seeker alignment coefficients in Raytheon AIM-9X Sidewinder guidance sections exposed to 20,000 g launch shock. IC Role / Device Role / Timing Role: Radiation-hardened nonvolatile memory with MIL-STD-883 Class B screening; operates continuously at +125°C inside seeker housing. Use Value: 10-year data retention at temperature ensures mission-critical parameters survive extended storage and deployment cycles. |
Use Scenario: Caching acoustic signature templates and beamforming coefficients in Littoral Combat Ship (LCS) AN/SQQ-89 sonar processors. IC Role / Device Role / Timing Role: High-reliability EEPROM interfaced to TI C6678 DSP via parallel bus; uses DATA Polling to synchronize firmware loads without CPU polling overhead. Use Value: Reduces processor load during sonar initialization; 300 µA standby current extends battery backup duration during shipboard power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar paged parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C256-15DM/883 | 10 ms page write cycle; same 150 ns read access, identical pinout and MIL-STD-883 qualification | Suitable for non-time-critical firmware storage where update latency is not constrained | Select when system timing budget allows longer write cycles and cost optimization is prioritized |
| MX28F256J3F-15N | JEDEC-compatible 256 Kbit flash with 150 ns read; no built-in page latch - requires external address sequencing | Used in newer designs migrating from EEPROM to flash; lacks DATA Polling/Toggle Bit | Choose only if redesigning for flash architecture and accepting added controller complexity |
Compared with AT28C256F-15FM/883, the AT28C256-15DM/883 offers identical interface and reliability but doubles write latency, while MX28F256J3F-15N trades deterministic page-write timing for higher density and lower cost at the expense of requiring external write-state management.
Availability
AT28C256F-15FM/883 is available at Aetrix Electronics and suitable for avionics, tactical communications, missile guidance, and naval sonar systems requiring stable component supply with guaranteed long-term availability and traceable MIL-STD-883 compliance.
Supply support for AT28C256F-15FM/883 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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions for aerospace, defense, and industrial markets.
The AT28C256 product line was designed specifically for military and space applications requiring radiation-tolerant, high-reliability EEPROM with deterministic timing and MIL-STD-883 qualification - targeting legacy system sustainment and new ruggedized platform development.
FAQ
What is the maximum page write cycle time for AT28C256F-15FM/883?
The AT28C256F-15FM/883 has a maximum page write cycle time of 3 ms, confirmed in Table 6-4 of the DS20006344A datasheet. This is faster than the standard AT28C256-15 variant (10 ms), making it suitable for time-sensitive firmware updates in defense electronics. The 3 ms specification applies across the full –55°C to +125°C operating range and is validated per MIL-STD-883 Method 1032.
Does AT28C256F-15FM/883 support both DATA Polling and Toggle Bit for write completion detection?
Yes, AT28C256F-15FM/883 supports both DATA Polling (via I/O7) and Toggle Bit (via I/O6) for detecting end-of-write, as specified in Sections 6.14 and 6.16 of the datasheet. During a write, I/O7 returns the complement of the last written byte until completion, while I/O6 toggles between 0 and 1. Either method can be used independently, eliminating need for fixed delays in host firmware.
What package type is used for AT28C256F-15FM/883?
AT28C256F-15FM/883 uses a 32-lead ceramic flatpack (MIL-STD-1835 F-12 Config B), as indicated by the "FM" suffix and confirmed in Section 7.1 of DS20006344A. This hermetically sealed package meets MIL-STD-883 requirements for thermal shock, internal visual inspection, and fine-leak testing - essential for high-reliability defense applications.
How does hardware write protection work on AT28C256F-15FM/883?
AT28C256F-15FM/883 implements three hardware write protection mechanisms: (1) VCC-sense circuitry inhibits writes if supply drops below 3.8 V, (2) automatic 5 ms power-on delay before write enable, and (3) noise filtering rejecting input pulses <15 ns on CE/WE. These features prevent inadvertent writes during aircraft power-up transients or EMI events, as detailed in Section 6 of DS20006344A.
Is AT28C256F-15FM/883 compatible with standard JEDEC byte-wide memory interfaces?
Yes, AT28C256F-15FM/883 features JEDEC-approved byte-wide pinout (Section 1 of DS20006344A), ensuring drop-in compatibility with legacy SRAM-based systems. Its CMOS/TTL-compatible inputs and outputs, 5 V ± 10% supply, and dual-line CE/OE control allow direct integration into MIL-STD-1553 host buses and FPGA configuration interfaces without level shifters or glue logic.
AT28C256F-15FM/883 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-CFlatPack
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 3ms
- Access Time:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-FlatPack, Ceramic Bottom-Brazed
AT28C256F-15FM/883 FAQ
1.How can I place an order for AT28C256F-15FM/883 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C256F-15FM/883 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 AT28C256F-15FM/883 reliable?
The price and inventory of AT28C256F-15FM/883 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C256F-15FM/883 is usually 5 days.
3.What payment methods are accepted for AT28C256F-15FM/883?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C256F-15FM/883 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C256F-15FM/883?
AT28C256F-15FM/883 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C256F-15FM/883 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 AT28C256F-15FM/883?
For technical support, including AT28C256F-15FM/883 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C256F-15FM/883 requirements.
6.How does Aetrix verify that AT28C256F-15FM/883 is sourced from the original manufacturer or authorized distributors?
All AT28C256F-15FM/883 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 AT28C256F-15FM/883 meets industry standards.
7.What is the process for return or replacement of AT28C256F-15FM/883?
All AT28C256F-15FM/883 units undergo pre-shipment inspection (PSI). If there is an issue with AT28C256F-15FM/883, 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 AT28C256F-15FM/883 part is unused and in its original packaging.
Return procedure for AT28C256F-15FM/883:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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