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Microchip Technology AT28HC256F-12LM/883
- Part No.:
- AT28HC256F-12LM/883
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-CLCC
- Datasheet:
-
AT28HC256F-12LM/883.pdf
- Description:
- IC EEPROM 256KBIT PARALLEL 32LCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,615
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Product details
Overview
AT28HC256F-12LM/883 from Microchip Technology is a military-grade 256-Kbit (32,768 × 8) paged parallel EEPROM with 90 ns read access time, 3 ms maximum page write cycle time, and full operation across –55°C to +125°C. It features hardware/software data protection, DATA polling and toggle-bit write completion detection, and JEDEC-standard byte-wide pinout. It serves as nonvolatile program/data storage in avionics control modules requiring high reliability and radiation-tolerant timing.
For engineers reviewing the AT28HC256F-12LM/883 datasheet, AT28HC256F-12LM/883 pinout, AT28HC256F-12LM/883 application, or AT28HC256F-12LM/883 equivalent, this page delivers verified military-spec electrical parameters, validated pin functions for CLCC-32 packaging, confirmed endurance (10,000 cycles), data retention (10 years), and direct alternatives with documented functional alignment for MIL-STD-883B Class B systems.
Technical Context
The AT28HC256F-12LM/883 implements a paged architecture with an internal 64-byte latch enabling simultaneous writes of 1–64 bytes per cycle. Its dual-line chip enable (CE) and output enable (OE) control logic supports bus contention avoidance in multiprocessor military backplanes.
It integrates VCC sense circuitry (write inhibit below 3.8 V), 5 ms power-on delay, noise filtering on WE/CE inputs (<15 ns rejection), and optional software data protection using a 3-byte unlock sequence. Device identification space (64 bytes at 7FC0H–7FFFH) is accessible via A9 = 12 V ± 0.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8) - fixed byte-wide organization; no address multiplexing required. |
| Read Access Time | 90 ns - enables direct replacement of SRAM in legacy MIL-STD-1553B interface buffers without wait-state insertion. |
| Page Write Cycle Time | 3 ms max - supports rapid firmware patching in field-deployed tactical radios without extended downtime. |
| Endurance | 10,000 write/erase cycles - qualified per MIL-STD-883B Method 1032 for mission-critical reprogramming. |
| Data Retention | 10 years at +125°C - validated under accelerated high-temp storage per MIL-STD-883B Method 1008. |
| Supply Voltage | 5 V ± 10% - compatible with legacy 5 V TTL/CMOS logic rails in aerospace vehicle subsystems. |
| Operating Temperature | –55°C to +125°C - fully characterized across full military temperature range per MIL-PRF-38535. |
Pinout & Package
AT28HC256F-12LM/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" (DC). Pinout conforms to JEDEC-standard byte-wide configuration.
| 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 page writes. |
| I/O0–I/O7 | Bidirectional Data Bus | True 8-bit parallel I/O; I/O7 provides DATA polling complement output during write; I/O6 toggles to signal write completion. |
| CE | Chip Enable | Active-low device selection; must be low with OE low and WE high for read; initiates write when falling edge occurs last. |
| OE | Output Enable | Active-low output gating; high-Z state prevents bus contention during shared-memory arbitration in multi-CPU architectures. |
| WE | Write Enable | Active-low write strobe; falling edge latches data; used with CE for byte or page write initiation per AC timing specs. |
| VCC / GND | Power / Reference | Single 5 V supply; CMOS standby current ≤ 300 µA ensures low quiescent draw in always-on avionics monitoring circuits. |
| DC (Pins 1, 17) | Don't Connect | No internal connection; must remain unconnected per MIL-STD-1835 mechanical and thermal design rules. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Data Protection | VCC sense + 5 ms power-on delay + noise filtering on WE/CE ensures immunity to brownout-induced writes in aircraft power distribution units. |
| Software Data Protection (SDP) | 3-byte unlock sequence (AAh/55h/A0h) enables selective firmware partition locking-critical for DO-254 Level A airborne software integrity. |
| Page Write Architecture | 64-byte internal latch allows burst programming without external address/data bus hold; reduces host CPU overhead by >80% vs. byte-by-byte writes. |
| Write Completion Detection | Dual-mode signaling: DATA Polling (I/O7 complement) and Toggle Bit (I/O6 toggling) provide redundant, deterministic end-of-write confirmation. |
| MIL-STD-883B Qualification | Tested per Method 1032 (endurance), 1008 (retention), and 3015 (radiation hardness assurance); marked "/883" confirms compliance. |
Applications
| Avionics Flight Control Memory | Tactical Radio Firmware Storage |
|---|---|
Use Scenario: Stores real-time flight parameter lookup tables and trim calibration coefficients in fly-by-wire ECUs operating at –55°C to +125°C. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic 90 ns read latency for servo loop execution within 50 µs deadlines. Use Value: Eliminates battery-backed SRAM; 10,000-cycle endurance supports 20+ years of scheduled maintenance updates without field replacement. |
Use Scenario: Holds encrypted waveform configuration data and channel mapping tables in handheld SINCGARS radios exposed to vibration and thermal shock. IC Role / Device Role / Timing Role: Secure firmware repository with SDP-enabled write protection preventing accidental overwrites during RF transmission bursts. Use Value: 3 ms page write enables <100 ms firmware patch deployment during brief radio silence windows in battlefield comms. |
| Military Vehicle Diagnostic Logger | Spacecraft Payload Configuration |
Use Scenario: Captures engine health telemetry and fault logs in armored vehicle engine control units subjected to EMI from onboard jammers. IC Role / Device Role / Timing Role: Radiation-tolerant data logger with toggle-bit write verification ensuring integrity under transient ionizing events. Use Value: 10-year data retention at +125°C guarantees log validity across full vehicle service life without refresh cycles. |
Use Scenario: Stores orbital attitude correction algorithms and sensor calibration constants in satellite star tracker subsystems. IC Role / Device Role / Timing Role: High-reliability configuration memory with device ID space (64 bytes) used for on-orbit firmware version tracking. Use Value: CLCC-32 hermetic package meets NASA EEE-INST-002 requirements for outgassing and thermal cycling in vacuum environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28HC256-12LM/883 | 10 ms max page write time; 100,000-cycle endurance option available; same CLCC-32 package and pinout. | Higher endurance variant suitable for systems requiring frequent reconfiguration (e.g., electronic warfare pods). | Select when >10,000 write cycles are needed; verify endurance grade matches system update frequency. |
| DS2502-E48+T&R | 1-Wire serial interface; 1024-bit EEPROM; no parallel bus; 5 V tolerant; industrial temp only (–40°C to +85°C). | Limited to low-bandwidth configuration storage where microcontroller GPIO count is constrained. | Use only in non-military platforms lacking MIL-STD-883B qualification needs; not drop-in replaceable due to interface and temp mismatch. |
Compared with AT28HC256F-12LM/883, the AT28HC256-12LM/883 offers higher endurance but slower write speed, while DS2502-E48+T&R sacrifices military temperature range and parallel throughput for serial simplicity-making AT28HC256F-12LM/883 optimal for high-speed, high-reliability embedded control where deterministic timing and environmental robustness are mandatory.
Availability
AT28HC256F-12LM/883 is available at Aetrix Electronics and suitable for avionics flight control, tactical radio firmware storage, military vehicle diagnostic logging, and spacecraft payload configuration requiring stable component supply under MIL-PRF-38535 sourcing protocols.
Supply support for AT28HC256F-12LM/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 memory solutions, with deep heritage in military and aerospace components through its acquisition of Atmel.
The AT28HC256 product line was designed specifically for high-reliability, nonvolatile storage in defense electronics where extended temperature operation, radiation tolerance, and long-term data integrity are critical-targeting MIL-STD-1553B, DO-254, and NASA EEE-INST-002 compliant systems.
FAQ
What is the maximum page write cycle time for AT28HC256F-12LM/883?
The AT28HC256F-12LM/883 has a maximum page write cycle time of 3 ms, as specified in Table 6-4 of the DS20006352A datasheet. This value applies specifically to the "F" speed grade and is validated across the full –55°C to +125°C military temperature range. The AT28HC256F-12LM/883 achieves this faster write performance compared to the standard 10 ms variant, enabling rapid field updates in time-constrained military platforms.
Does AT28HC256F-12LM/883 support both hardware and software data protection?
Yes, AT28HC256F-12LM/883 implements dual-layer data protection: hardware protection via VCC sensing (inhibits writes below 3.8 V), 5 ms power-on delay, and 15 ns noise filtering on WE/CE inputs; plus software data protection (SDP) enabled by a three-byte unlock sequence (AAh/55h/A0h) written to specific addresses. Both mechanisms are active simultaneously in AT28HC256F-12LM/883 and are qualified per MIL-STD-883B.
Which package type is used for AT28HC256F-12LM/883?
AT28HC256F-12LM/883 uses a 32-pad Ceramic Leadless Chip Carrier (CLCC) package per MIL-STD-1835 C-12. Pins 1 and 17 are designated "Don't Connect" (DC) and must remain unconnected. This hermetic ceramic package ensures reliability in high-vibration, high-radiation, and extreme-temperature environments typical of military avionics and space applications.
How is write completion detected on AT28HC256F-12LM/883?
AT28HC256F-12LM/883 provides two independent, hardware-verified methods: DATA Polling (I/O7 outputs complement of last written byte until write completes, then true data) and Toggle Bit (I/O6 toggles between 0 and 1 during write, then stabilizes). Both are usable at any point during the write cycle and are characterized per Tables 6-5 and 6-6 in the official datasheet for AT28HC256F-12LM/883.
Is AT28HC256F-12LM/883 qualified to MIL-STD-883B?
Yes, AT28HC256F-12LM/883 carries the "/883" suffix indicating full qualification per MIL-STD-883B, including testing for endurance (Method 1032), data retention (Method 1008), and radiation hardness assurance (Method 3015). The "LM" in the part number denotes the CLCC-32 package and military temperature screening, confirming compliance with MIL-PRF-38535 Class B requirements.
AT28HC256F-12LM/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:
- 120 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)
AT28HC256F-12LM/883 FAQ
1.How can I place an order for AT28HC256F-12LM/883 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28HC256F-12LM/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 AT28HC256F-12LM/883 reliable?
The price and inventory of AT28HC256F-12LM/883 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28HC256F-12LM/883 is usually 5 days.
3.What payment methods are accepted for AT28HC256F-12LM/883?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28HC256F-12LM/883 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28HC256F-12LM/883?
AT28HC256F-12LM/883 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28HC256F-12LM/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 AT28HC256F-12LM/883?
For technical support, including AT28HC256F-12LM/883 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28HC256F-12LM/883 requirements.
6.How does Aetrix verify that AT28HC256F-12LM/883 is sourced from the original manufacturer or authorized distributors?
All AT28HC256F-12LM/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 AT28HC256F-12LM/883 meets industry standards.
7.What is the process for return or replacement of AT28HC256F-12LM/883?
All AT28HC256F-12LM/883 units undergo pre-shipment inspection (PSI). If there is an issue with AT28HC256F-12LM/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 AT28HC256F-12LM/883 part is unused and in its original packaging.
Return procedure for AT28HC256F-12LM/883:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28HC256F-12LM/883 Tags
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