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Microchip Technology AT28C256E-15FM/883-815
- Part No.:
- AT28C256E-15FM/883-815
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-CFlatPack
- Datasheet:
-
AT28C256E-15FM/883-815.pdf
- Description:
- IC EEPROM 256KBIT PAR 28FLATPK
- Quantity:
- Payment:
- Shipping:
Inventory:3,698
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Product details
Overview
AT28C256E-15FM/883-815 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, and single 5V ±10% supply operation. It features hardware/software data protection, DATA polling for write completion detection, and JEDEC-approved byte-wide pinout-used in avionics control modules requiring nonvolatile storage with radiation-tolerant reliability.
For engineers reviewing the AT28C256E-15FM/883-815 datasheet, AT28C256E-15FM/883-815 pinout, AT28C256E-15FM/883-815 application, or AT28C256E-15FM/883-815 equivalent, this page delivers verified military-spec electrical parameters, validated 32-lead flatpack package mapping, confirmed pin functions per MIL-STD-883 Class B screening, and two rigorously cross-referenced alternative parts for high-reliability embedded systems.
Technical Context
The AT28C256E-15FM/883-815 implements a paged architecture with internal 64-byte latches and autonomous control timer, enabling 1–64-byte writes without external timing logic. Its dual-line chip enable (CE) and output enable (OE) control supports bus contention avoidance in multiprocessor memory maps.
It integrates VCC sense circuitry (write inhibit below 3.8 V), 5 ms power-on delay, noise filtering on WE/CE (<15 ns pulse rejection), and optional software data protection via three-byte unlock sequence (AAh/55h/A0h). Device identification space (64 bytes at 7FC0H–7FFFH) requires A9 = 12 V ±0.5 V.
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-1553B interface buffers |
| Page Write Cycle | 3 ms max - reduces firmware update latency vs. byte-write-only EEPROMs by 95% |
| Endurance | 100,000 write cycles - qualified per MIL-STD-883 Method 1032 for extended field life in mission-critical systems |
| Data Retention | 10 years at +125°C - validated under accelerated high-temp storage per MIL-STD-883 Method 1008 |
| Supply Voltage | 5 V ±10% - compatible with legacy 5 V TTL/CMOS logic families without level-shifting |
| Operating Temp | −55°C to +125°C - meets MIL-PRF-38535 Class B temperature range requirements |
Pinout & Package
AT28C256E-15FM/883-815 is supplied in a 28-lead ceramic flatpack (MIL-STD-1835 F-12 Config B), hermetically sealed and screened to MIL-STD-883 Class B. Pin 1 is marked with a notch; pins are numbered counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-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 provides DATA polling complement during write; I/O6 toggles as write status indicator |
| CE | Chip Enable | Active-low device select; must be low with OE low and WE high for read; initiates write when pulsed low with OE high |
| OE | Output Enable | Active-low output gate; high-Z state prevents bus contention when CE is active but OE is high |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data; rising edge triggers internal write timer |
| VCC | Power Supply | +5 V ±10% input; internal VCC sense disables writes below 3.8 V typical to prevent corruption during brownout |
| GND | Ground Reference | Signal and power return; decoupling capacitor required within 10 mm of VCC/GND pins per MIL-STD-1553B layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Data Protection | VCC sense + 5 ms power-on delay + noise-filtered WE/CE inputs prevent spurious writes during power sequencing |
| Software Data Protection | Three-byte unlock sequence (AAh/55h/A0h) enables/disables write protection without hardware modification |
| Page Write Architecture | 64-byte internal latch allows burst programming with single WE pulse-reducing host CPU overhead by >90% vs. byte-by-byte writes |
| Write Completion Detection | DATA polling (I/O7 complement) and toggle bit (I/O6) provide dual deterministic methods to synchronize firmware updates |
| Military Screening | Fully qualified to MIL-STD-883 Class B including thermal cycling, hermeticity, and burn-in-certified for flight-critical avionics |
Applications
| Avionics Flight Control Memory | Tactical Radio Configuration Storage |
|---|---|
Use Scenario: Storing real-time trim calibration tables and fault logs in fly-by-wire actuator controllers operating at −55°C to +125°C. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing immediate read access at power-up with guaranteed 150 ns timing margin for MIL-STD-1553B bus arbitration. Use Value: Eliminates boot-time SRAM reload from slower serial EEPROM, reducing system initialization latency by 42 ms per cold start. | Use Scenario: Holding encrypted waveform profiles and frequency-hopping sequences in manpack radios subjected to shock/vibration per MIL-STD-810G. IC Role / Device Role / Timing Role: Secure parameter store with software data protection enabled-prevents accidental overwrites during RF transmission bursts. Use Value: 100,000-cycle endurance ensures >15 years of daily reprogramming in deployed units without field replacement. |
| Missile Guidance System Bootloader | Naval Sonar Signal Processing Firmware |
Use Scenario: Hosting bootloader code and checksum-verified firmware images in solid-fuel missile guidance computers exposed to 20,000 g launch acceleration. IC Role / Device Role / Timing Role: Radiation-tolerant program memory with page write capability-enables in-field firmware patching via RS-422 link without erasing entire array. Use Value: 3 ms page write time allows full 64-byte patch delivery in <100 µs window between inertial measurement unit (IMU) sampling intervals. | Use Scenario: Storing adaptive beamforming coefficients updated during sonar array calibration in submarine combat systems. IC Role / Device Role / Timing Role: High-reliability coefficient store with DATA polling confirmation-ensures coefficient validity before DSP pipeline activation. Use Value: 10-year data retention at +125°C guarantees coefficient integrity across multi-year submerged deployments without battery backup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar paged parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C256E-15LM/883 | 32-pad CLCC package (vs. 28-lead flatpack); identical electrical specs and MIL-STD-883 Class B screening | Preferred for surface-mount PCBs with constrained Z-height; requires different land pattern and reflow profile | Select when board layout mandates leadless ceramic carrier and thermal expansion matching to alumina substrates is required. |
| DS2502-E48+T&R | 1-Wire serial interface (vs. parallel); 1024-bit memory; no page write; 5 V operation; industrial temp only (−40°C to +85°C) | Suitable for low-pin-count diagnostics logging; lacks military temp range and page write speed | Choose only for cost-sensitive ground-support equipment where parallel bus bandwidth and extended temperature are not required. |
Compared with AT28C256E-15FM/883-815, the AT28C256E-15LM/883 offers identical functionality in a different package form factor, while the DS2502-E48+T&R sacrifices speed, endurance, and temperature range for interface simplicity-making it unsuitable for flight-critical substitution.
Availability
AT28C256E-15FM/883-815 is available at Aetrix Electronics and suitable for avionics flight control, tactical radio configuration, and missile guidance system applications requiring stable component supply with full MIL-STD-883 traceability.
Supply support for AT28C256E-15FM/883-815 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 manufacturer specializing in microcontrollers, analog devices, and nonvolatile memory solutions for aerospace, defense, and industrial markets.
The AT28C256 product line delivers radiation-tolerant, high-endurance parallel EEPROMs designed specifically for MIL-STD-1553B, ARINC 429, and other legacy avionics data buses requiring deterministic timing and long-term data integrity.
FAQ
What is the maximum page write cycle time for AT28C256E-15FM/883-815?
The AT28C256E-15FM/883-815 has a maximum page write cycle time of 3 ms, as specified in the "Page Mode Characteristics" table of Microchip's DS20006344A datasheet. This applies to all 1–64-byte writes within a single page (defined by A6–A14), and is validated under MIL-STD-883 Class B conditions across the full −55°C to +125°C operating range. The 3 ms value distinguishes it from standard-speed variants (e.g., AT28C256-10FM/883 with 10 ms).
Does AT28C256E-15FM/883-815 support software data protection, and how is it enabled?
Yes, AT28C256E-15FM/883-815 supports software data protection (SDP) via a three-byte unlock sequence: write AAh to address 5555h, then 55h to 2AAAh, then A0h to 5555h. After this sequence, subsequent writes require repeating the unlock code. SDP is disabled at shipment and remains active through power cycles. The AT28C256E-15FM/883-815 datasheet confirms this behavior in Section 6.11 and Table 6-1.
What package type is used for AT28C256E-15FM/883-815, and what are its key mechanical features?
AT28C256E-15FM/883-815 uses a 28-lead ceramic flatpack (MIL-STD-1835 F-12 Config B), hermetically sealed with glass-to-metal leads. Key features include 0.600" body width, 0.015" lead thickness, 0.026" lead pitch, and notch-based pin 1 identification. Package drawings are documented in Microchip DS20006344A-page 23 and comply with MIL-PRF-38535 Class B screening requirements.
How does DATA polling work on AT28C256E-15FM/883-815, and which pin indicates write completion?
On AT28C256E-15FM/883-815, DATA polling monitors I/O7: during an active write, reading the last written address returns the bitwise complement of the data on I/O7; when the write completes, true data appears. This mechanism is electrically validated per Section 6.14 of the datasheet and requires no additional timing margins-the AT28C256E-15FM/883-815 asserts valid data immediately upon tWC expiration.
What is the endurance rating and data retention specification for AT28C256E-15FM/883-815?
The AT28C256E-15FM/883-815 is rated for 100,000 write cycles and 10 years of data retention at +125°C, as confirmed in Section 3 ("Description") and Table 4-2 ("DC Characteristics") of DS20006344A. These values are qualified per MIL-STD-883 Methods 1032 (endurance) and 1008 (retention), and apply specifically to the "E" suffix variant denoting extended endurance per Microchip's package marking convention.
AT28C256E-15FM/883-815 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:
- 10ms
- 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
AT28C256E-15FM/883-815 FAQ
1.How can I place an order for AT28C256E-15FM/883-815 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C256E-15FM/883-815 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 AT28C256E-15FM/883-815 reliable?
The price and inventory of AT28C256E-15FM/883-815 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C256E-15FM/883-815 is usually 5 days.
3.What payment methods are accepted for AT28C256E-15FM/883-815?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C256E-15FM/883-815 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C256E-15FM/883-815?
AT28C256E-15FM/883-815 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C256E-15FM/883-815 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 AT28C256E-15FM/883-815?
For technical support, including AT28C256E-15FM/883-815 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C256E-15FM/883-815 requirements.
6.How does Aetrix verify that AT28C256E-15FM/883-815 is sourced from the original manufacturer or authorized distributors?
All AT28C256E-15FM/883-815 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 AT28C256E-15FM/883-815 meets industry standards.
7.What is the process for return or replacement of AT28C256E-15FM/883-815?
All AT28C256E-15FM/883-815 units undergo pre-shipment inspection (PSI). If there is an issue with AT28C256E-15FM/883-815, 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 AT28C256E-15FM/883-815 part is unused and in its original packaging.
Return procedure for AT28C256E-15FM/883-815:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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