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Microchip Technology AT28C256F-15LM/883-815
- Part No.:
- AT28C256F-15LM/883-815
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-CLCC
- Datasheet:
-
AT28C256F-15LM/883-815.pdf
- Description:
- IC EEPROM 256KBIT PARALLEL 32LCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,353
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Product details
Overview
AT28C256F-15LM/883-815 from Microchip Technology is a military-grade paged parallel EEPROM with 256-Kbit (32,768 × 8) organization, 150 ns read access time, and 3 ms maximum page write cycle time. It operates from a single 5V ±10% supply, supports hardware/software data protection, and is used in avionics control modules requiring nonvolatile storage with high reliability under extended temperature extremes.
For engineers reviewing the AT28C256F-15LM/883-815 datasheet, AT28C256F-15LM/883-815 pinout, AT28C256F-15LM/883-815 application, or AT28C256F-15LM/883-815 equivalent, this page delivers verified military-spec electrical parameters, JEDEC-compliant byte-wide pin mapping, endurance and retention data, and validated alternatives for MIL-PRF-38535 Class B and QML-38535 qualified designs.
Technical Context
The AT28C256F-15LM/883-815 implements a paged write architecture with an internal 64-byte latch, enabling simultaneous programming of 1–64 bytes per cycle without external timing control. Its dual-line chip enable (CE) and output enable (OE) logic allows bus contention avoidance in multi-device memory systems.
It features DATA Polling (I/O7 complement detection) and Toggle Bit (I/O6 toggling) mechanisms for end-of-write detection, both operable at any point during the internal 3 ms write cycle. Hardware protection includes VCC sense (<3.8 V inhibit), 5 ms power-on delay, and noise filtering on WE/CE inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8) - fixed byte-wide organization compatible with 8-bit microprocessor data buses |
| Read Access Time | 150 ns max - enables direct replacement of SRAM in legacy military systems without wait-state insertion |
| Page Write Cycle Time | 3 ms max - 3× faster than standard AT28C256-10 variants, reducing firmware update latency in field-programmable subsystems |
| Endurance | 10,000 write/erase cycles - specified for F-suffix variant per MIL-STD-883 Method 1037, suitable for infrequent configuration storage |
| Data Retention | 10 years at +125°C - validated for long-term deployment in sealed avionics enclosures without refresh |
| Operating Temperature | −55°C to +125°C - meets MIL-PRF-38535 Class B screening requirements for extended thermal range operation |
| Supply Voltage | 5V ±10% - CMOS/TTL-compatible interface eliminates level-shifting in mixed-logic legacy platforms |
Pinout & Package
AT28C256F-15LM/883-815 is supplied in a 32-pad Ceramic Leadless Chip Carrier (CLCC) package per MIL-STD-1835 C-12, with pins 1 and 17 designated "Don't Connect" (DC). The package is hermetically sealed, rated for 100% burn-in and 100% parametric testing per QML-38535.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32,768-word addressing; A6–A14 define 64-byte page boundaries for write operations |
| I/O0–I/O7 | Bidirectional Data Bus | CMOS/TTL-compatible 8-bit data path; I/O7 provides DATA Polling status, I/O6 provides Toggle Bit status |
| CE | Chip Enable | Active-low device select; must be low with OE low and WE high for read access; initiates write when pulsed low with OE high |
| OE | Output Enable | Active-low output gate; controls tri-state buffer; must be high during write cycles to prevent bus contention |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data; rising edge triggers internal timer for 3 ms page write |
| VCC | Power Supply | +5V ±10% primary supply; powers core logic and I/O buffers; VCC sense circuitry disables writes below 3.8 V |
| GND | Ground Reference | Signal and power return; decoupling capacitor required within 10 mm of VCC/GND pins per MIL-STD-1378 |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Architecture | 64-byte internal latch enables burst programming without CPU bus hold; reduces firmware update time by >90% vs. byte-by-byte writes |
| DATA Polling & Toggle Bit | Dual asynchronous write completion detection methods eliminate need for fixed delays or external timers in real-time systems |
| Hardware Data Protection | VCC sense, 5 ms power-on delay, and 15 ns noise filter prevent spurious writes during brown-out or EMI events in flight-critical systems |
| Software Data Protection (SDP) | Three-byte command sequence (AAh/55h/A0h) enables/disables write lock; retains state across power cycles for secure configuration storage |
| Device Identification Area | 64-byte reserved EEPROM block (7FC0h–7FFFh) accessible via 12 V on A9 for traceability, calibration data, or firmware version stamping |
Applications
| Avionics Flight Control Unit | Military Radar Signal Processor |
|---|---|
Use Scenario: Storing calibrated sensor offsets and mission-specific FIR filter coefficients in airborne radar warning receivers. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during boot and runtime reconfiguration; 150 ns read latency ensures deterministic interrupt response. Use Value: Eliminates battery-backed SRAM; 10-year data retention at +125°C avoids recalibration during depot-level maintenance cycles. |
Use Scenario: Holding FPGA configuration bitstreams and DSP boot code in ground-based electronic warfare jammers. IC Role / Device Role / Timing Role: Parallel boot memory mapped to processor address space; page write enables rapid field updates of threat libraries. Use Value: 3 ms page write cuts software-defined radio reprogramming time from seconds to milliseconds, improving operational agility. |
| Tactical Vehicle Engine Control Module | Satellite Onboard Computer |
Use Scenario: Persisting engine calibration maps and fault logs in armored vehicle ECUs exposed to −55°C cold-soak and 125°C under-hood conditions. IC Role / Device Role / Timing Role: Mission-critical parameter storage with hardware write inhibit during ignition transients. Use Value: VCC sense and noise filtering prevent corruption during 12 V battery dips; MIL-PRF-38535 qualification ensures radiation-tolerant operation. |
Use Scenario: Storing telemetry calibration constants and watchdog timeout values in LEO satellite OBCs with limited power budgets. IC Role / Device Role / Timing Role: Low-power nonvolatile memory; 300 µA standby current extends battery life between ground station uploads. Use Value: Hermetic CLCC package prevents moisture-induced failure in vacuum; 10,000-cycle endurance supports 15+ year orbital missions. |
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 | Same die, 32-lead CERDIP package; 10,000-cycle endurance; no F-suffix fast-write optimization | Lower thermal mass than CLCC; less suitable for high-vibration environments requiring ceramic lid sealing | Select for legacy board designs with existing CERDIP footprints and where 10 ms write time is acceptable |
| DS2502-E48+T&R | 1-Wire serial EEPROM; 4 Kb capacity; 5 V operation; no parallel bus interface or page write capability | Requires microcontroller GPIO bit-banging; incompatible with address/data bus architectures | Choose only for new ultra-low-pin-count designs where serial interface suffices and memory size requirements are ≤4 Kb |
Compared with AT28C256F-15LM/883-815, the AT28C256-15DM/883 offers identical functionality in a different military package but lacks the 3 ms page write speed, while the DS2502-E48+T&R sacrifices parallel bus compatibility and capacity for serial simplicity-neither is pin- or functionally compatible.
Availability
AT28C256F-15LM/883-815 is available at Aetrix Electronics and suitable for avionics flight control units, military radar signal processors, tactical vehicle engine control modules, and satellite onboard computers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT28C256F-15LM/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 Inc. 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 developed to deliver radiation-tolerant, high-reliability parallel EEPROMs for MIL-PRF-38535-certified systems requiring deterministic timing, hardware write protection, and extended temperature operation.
FAQ
What is the maximum page write cycle time for AT28C256F-15LM/883-815?
The AT28C256F-15LM/883-815 has a maximum page write cycle time of 3 ms, as confirmed in Table 6-4 of the DS20006344A datasheet. This is specific to the F-suffix variant and distinguishes it from standard AT28C256-10/-15 parts with 10 ms write times. The 3 ms specification applies across the full −55°C to +125°C operating range and is guaranteed under MIL-STD-883 test conditions.
Does AT28C256F-15LM/883-815 support software data protection (SDP)?
Yes, AT28C256F-15LM/883-815 supports software data protection (SDP) using a three-byte command sequence (AAh → 55h → A0h) written to addresses 5555h, 2AAAh, and 5555h respectively. Once enabled, SDP remains active across power cycles and requires the same sequence to disable. The feature is implemented identically across all AT28C256 variants, including the F-suffix military grade part.
What package type is used for AT28C256F-15LM/883-815?
AT28C256F-15LM/883-815 uses a 32-pad Ceramic Leadless Chip Carrier (CLCC) package per MIL-STD-1835 C-12. Pin 1 is marked by an index corner, and pins 1 and 17 are designated "Don't Connect" (DC). The package is hermetically sealed, screened to QML-38535 Class B, and marked with "AT28C256@15LM/883" per section 7.1 of the datasheet.
How is end-of-write detection implemented in AT28C256F-15LM/883-815?
AT28C256F-15LM/883-815 provides two independent end-of-write detection methods: DATA Polling (monitoring I/O7 for complemented data) and Toggle Bit (observing I/O6 toggling state). Both operate asynchronously and can be polled at any time during the 3 ms internal write cycle. These mechanisms eliminate reliance on fixed timing delays in safety-critical firmware.
What is the endurance rating for AT28C256F-15LM/883-815?
The AT28C256F-15LM/883-815 is rated for 10,000 write/erase cycles, as specified for the F-suffix variant in the "Package Marking Information" section (page 21) and confirmed in the "Features" list. This endurance level is validated per MIL-STD-883 Method 1037 and applies across the full military temperature range, distinguishing it from E-suffix (100,000-cycle) variants.
AT28C256F-15LM/883-815 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-CLCC
- 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:
- 32-LCC (11.43x13.97)
AT28C256F-15LM/883-815 FAQ
1.How can I place an order for AT28C256F-15LM/883-815 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C256F-15LM/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 AT28C256F-15LM/883-815 reliable?
The price and inventory of AT28C256F-15LM/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 AT28C256F-15LM/883-815 is usually 5 days.
3.What payment methods are accepted for AT28C256F-15LM/883-815?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C256F-15LM/883-815 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C256F-15LM/883-815?
AT28C256F-15LM/883-815 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C256F-15LM/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 AT28C256F-15LM/883-815?
For technical support, including AT28C256F-15LM/883-815 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C256F-15LM/883-815 requirements.
6.How does Aetrix verify that AT28C256F-15LM/883-815 is sourced from the original manufacturer or authorized distributors?
All AT28C256F-15LM/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 AT28C256F-15LM/883-815 meets industry standards.
7.What is the process for return or replacement of AT28C256F-15LM/883-815?
All AT28C256F-15LM/883-815 units undergo pre-shipment inspection (PSI). If there is an issue with AT28C256F-15LM/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 AT28C256F-15LM/883-815 part is unused and in its original packaging.
Return procedure for AT28C256F-15LM/883-815:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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