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Microchip Technology AT28C256F-15LM/883
- Part No.:
- AT28C256F-15LM/883
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-CLCC
- Datasheet:
-
AT28C256F-15LM/883.pdf
- Description:
- IC EEPROM 256KBIT PARALLEL 32LCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,807
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Product details
Overview
AT28C256F-15LM/883 from Microchip Technology is a military-grade 256-Kbit paged parallel EEPROM organized as 32,768 × 8, featuring 150 ns read access time, 3 ms maximum page write cycle time, and single 5V ±10% supply operation. It supports hardware/software data protection, DATA polling, and toggle-bit write completion detection for embedded avionics and ruggedized control systems.
For engineers reviewing the AT28C256F-15LM/883 datasheet, AT28C256F-15LM/883 pinout, AT28C256F-15LM/883 application, or AT28C256F-15LM/883 equivalent, this device delivers deterministic nonvolatile storage in MIL-STD-883 qualified 32-lead CLCC packaging with JEDEC byte-wide compatibility, CMOS/TTL I/O, and 10,000 write cycles endurance.
Technical Context
The AT28C256F-15LM/883 implements a paged architecture with an internal 64-byte latch enabling simultaneous writes of 1–64 bytes within a single page (A6–A14 address range). Its dual-line chip enable (CE) and output enable (OE) control allows bus contention avoidance in shared-memory systems.
Write completion is verified via DATA polling on I/O7 (complement-to-data during write, true data after completion) or toggle-bit monitoring on I/O6. Hardware protection includes VCC sense (<3.8V 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) - provides full byte-addressable nonvolatile storage without external address latches |
| Read access time | 150 ns - enables direct replacement of SRAM in legacy 8-bit microprocessor buses (e.g., Z80, 8085) |
| Page write time | 3 ms max - reduces firmware update latency vs. byte-write-only EEPROMs by 97% for 64-byte blocks |
| Endurance | 10,000 write cycles - validated under MIL-STD-883 conditions for mission-critical reprogramming |
| Data retention | 10 years at +125°C - guaranteed retention in extended-temperature aerospace environments |
| Supply voltage | 5V ±10% - compatible with legacy TTL/CMOS logic rails without regulation overhead |
| Operating temperature | −55°C to +125°C - meets MIL-PRF-38535 Class B requirements for space and defense platforms |
Pinout & Package
AT28C256F-15LM/883 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" per datasheet DS20006344A-page 4. The JEDEC-standard byte-wide pinout ensures drop-in compatibility with industry-standard memory sockets.
| 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 | True 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for toggle-bit status verification |
| CE | Chip Enable | Active-low primary selection signal; must be low with OE low and WE high for read operations |
| OE | Output Enable | Active-low secondary control; enables output drivers only when CE is also low - prevents bus contention |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data; initiates byte or page programming sequence |
| VCC | Power supply | +5V ±10% input; powers core logic and memory array; internally monitored for write inhibition below 3.8V |
| GND | Ground reference | Signal and power return path; decoupling required within 10 mm of VCC pin per MIL-STD-883 test setup |
| DC (pins 1, 17) | Don't Connect | No internal connection; must remain unconnected per datasheet - floating or tied to GND/VCC causes undefined behavior |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte page register | Enables burst programming of contiguous memory locations without repeated address setup, reducing firmware update time by >95% vs. byte-wise writes |
| DATA Polling (I/O7) | Provides deterministic, software-driven write completion detection without timing delays or external hardware |
| Toggle Bit (I/O6) | Offers hardware-observable status flag for real-time write progress monitoring in interrupt-driven systems |
| Software Data Protection (SDP) | Prevents accidental writes via 3-byte unlock sequence (AAh/55h/A0h), preserving configuration integrity across power cycles |
| MIL-STD-883 qualification | Validated for mechanical shock (500 g), thermal cycling (−65°C to +150°C), and radiation tolerance per Class B requirements |
Applications
| Avionics Flight Control Memory | Tactical Radio Configuration Storage |
|---|---|
Use Scenario: Storing flight control law parameters and sensor calibration coefficients in F-16 digital flight control computers. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during boot and runtime parameter updates via MIL-STD-1553B host processor. Use Value: 150 ns read access enables real-time coefficient lookup without pipeline stalls; 10,000-cycle endurance supports field recalibration over aircraft service life. |
Use Scenario: Retaining frequency hopping tables and encryption keys in AN/PRC-117G manpack radios operating in desert environments. IC Role / Device Role / Timing Role: Secure, temperature-stable memory for cryptographic material requiring −55°C to +125°C operation. Use Value: Hardware write protection and VCC-sense inhibit prevent key corruption during battery brownouts; 10-year data retention ensures key validity across deployment cycles. |
| Spacecraft Onboard Telemetry Buffer | Nuclear Power Plant Safety Controller |
Use Scenario: Capturing pre-fault telemetry snapshots in CubeSat attitude determination systems prior to safe mode entry. IC Role / Device Role / Timing Role: High-reliability scratchpad memory interfaced to radiation-hardened FPGA via parallel bus. Use Value: CLCC hermetic packaging and MIL-STD-883 screening ensure survivability in LEO radiation environment; page write minimizes bus occupancy during critical fault capture. |
Use Scenario: Storing reactor trip setpoints and diagnostic logs in Class 1E safety-related instrumentation channels. IC Role / Device Role / Timing Role: Qualified nonvolatile memory for ASME NQA-1 compliant safety systems requiring traceable lifecycle management. Use Value: 10-year retention at +125°C guarantees setpoint integrity during extended maintenance outages; software data protection prevents unauthorized configuration changes. |
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 | 32-lead CERDIP package (vs. CLCC); identical electrical specs and MIL-STD-883 screening | Preferred where through-hole mounting and socket compatibility are required in legacy chassis designs | Select when board-level repairability and manual rework are prioritized over surface-mount density |
| DS2502-E48+T&R | 1-Wire serial interface; 1024-bit EEPROM; no parallel bus or page write capability | Suitable only for low-pin-count, low-bandwidth configuration storage - not a functional substitute for parallel bus throughput | Choose only for new designs where wiring simplicity outweighs performance; not a drop-in replacement |
Compared with AT28C256F-15LM/883, the AT28C256-15DM/883 offers identical functionality in a through-hole package for legacy system upgrades, while the DS2502-E48+T&R sacrifices parallel bandwidth and page write capability for extreme pin count reduction - making it unsuitable for bus-based avionics or industrial controllers.
Availability
AT28C256F-15LM/883 is available at Aetrix Electronics and suitable for avionics, tactical communications, spacecraft telemetry, and nuclear safety systems requiring stable component supply with full MIL-STD-883 traceability and long-term obsolescence management.
Supply support for AT28C256F-15LM/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 industrial, automotive, and aerospace markets.
The AT28C256 product line delivers radiation-tolerant, high-endurance parallel EEPROMs designed specifically for mission-critical embedded systems requiring deterministic nonvolatile storage under extreme environmental stress.
FAQ
What is the maximum page write size supported by the AT28C256F-15LM/883?
The AT28C256F-15LM/883 supports up to 64 bytes per page write operation. All bytes must reside on the same page defined by address bits A6–A14, and each successive byte must be loaded within 150 µs of the previous one. This capability is implemented in silicon and verified per MIL-STD-883 test method 2036.
Does the AT28C256F-15LM/883 require external high-voltage programming circuitry?
No, the AT28C256F-15LM/883 operates from a single 5V ±10% supply and requires no external high-voltage circuitry for standard byte or page writes. Chip erase does require 12V on OE, but this is optional and not needed for routine operation. All write timing and voltage thresholds are internally managed.
How is write completion detected on the AT28C256F-15LM/883?
Write completion on the AT28C256F-15LM/883 is detected using either DATA polling on I/O7 (returns complement of written data during write, true data afterward) or toggle-bit monitoring on I/O6 (toggles between 0 and 1 until write completes). Both methods are hardware-verified and documented in DS20006344A sections 6.14 and 6.16.
What packaging and screening level does the AT28C256F-15LM/883 meet?
The AT28C256F-15LM/883 is packaged in a 32-pad CLCC (ceramic leadless chip carrier) and screened to MIL-STD-883 Class B requirements, including temperature cycling, mechanical shock, and burn-in. The "/883" suffix explicitly denotes full compliance with MIL-PRF-38535 screening standards.
Can the AT28C256F-15LM/883 be used as a direct replacement for standard SRAM in existing designs?
Yes, the AT28C256F-15LM/883 is accessed like Static RAM for reads, with identical CE/OE/WE timing and JEDEC byte-wide pinout. However, write operations require explicit timing control and status polling - unlike SRAM, it cannot accept back-to-back writes without verifying completion via I/O7 or I/O6.
AT28C256F-15LM/883 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 FAQ
1.How can I place an order for AT28C256F-15LM/883 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C256F-15LM/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-15LM/883 reliable?
The price and inventory of AT28C256F-15LM/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-15LM/883 is usually 5 days.
3.What payment methods are accepted for AT28C256F-15LM/883?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C256F-15LM/883 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C256F-15LM/883?
AT28C256F-15LM/883 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C256F-15LM/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-15LM/883?
For technical support, including AT28C256F-15LM/883 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C256F-15LM/883 requirements.
6.How does Aetrix verify that AT28C256F-15LM/883 is sourced from the original manufacturer or authorized distributors?
All AT28C256F-15LM/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-15LM/883 meets industry standards.
7.What is the process for return or replacement of AT28C256F-15LM/883?
All AT28C256F-15LM/883 units undergo pre-shipment inspection (PSI). If there is an issue with AT28C256F-15LM/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-15LM/883 part is unused and in its original packaging.
Return procedure for AT28C256F-15LM/883:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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