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Microchip Technology AT28C256E-15LM/883
- Part No.:
- AT28C256E-15LM/883
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-CLCC
- Datasheet:
-
AT28C256E-15LM/883.pdf
- Description:
- IC EEPROM 256KBIT PARALLEL 32LCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT28C256E-15LM/883 from Microchip Technology is a military-grade paged parallel EEPROM with 256-Kbit (32,768 × 8) organization, 150 ns read access time, single 5V ±10% supply, and JEDEC-approved byte-wide pinout. It operates across −55°C to +125°C and supports page write cycles of up to 64 bytes with automatic internal timing for embedded avionics and defense system firmware storage.
For engineers reviewing the AT28C256E-15LM/883 datasheet, AT28C256E-15LM/883 pinout, AT28C256E-15LM/883 application, or AT28C256E-15LM/883 equivalent, this page delivers verified military-spec electrical parameters, MIL-STD-883-compliant packaging details, hardware/software data protection logic, DATA Polling and Toggle Bit write completion detection, and direct alternatives for high-reliability nonvolatile memory replacement.
Technical Context
The AT28C256E-15LM/883 implements a CMOS-based paged EEPROM architecture with an internal 64-byte latch enabling simultaneous multi-byte writes without external address/data bus hold. Its dual-line chip enable (CE) and output enable (OE) control allows flexible bus contention management in synchronous memory-mapped systems.
It integrates VCC sense circuitry (write inhibit below 3.8 V), 5 ms power-on delay, noise filtering on WE/CE inputs (<15 ns pulse rejection), and optional software data protection (SDP) activated via three-byte command sequence at addresses 5555H/2AAAH/5555H. Device identification space (7FC0H–7FFFH) is accessible using A9 = 12 V ±0.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 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 80C86-based systems |
| Page Write Cycle Time | 10 ms max - ensures deterministic firmware update latency in safety-critical boot loaders |
| Endurance | 100,000 write/erase cycles - validated per MIL-STD-883 Method 1032 for extended field life |
| Data Retention | 10 years at +125°C - meets Class B requirements for airborne mission-critical configuration storage |
| Supply Voltage | 5 V ±10% - compatible with legacy TTL/CMOS logic rails without level-shifting |
| Operating Temperature | −55°C to +125°C - qualified per MIL-STD-883 Condition D for hermetic ceramic packages |
Pinout & Package
AT28C256E-15LM/883 is supplied in a 32-pad CLCC (Ceramic Leadless Chip Carrier) package compliant with MIL-STD-1835 C-12, featuring hermetic sealing and lead-free terminations. Pins 1 and 17 are designated "Don't Connect" per datasheet DS20006344A-page 4.
| 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 feedback, I/O6 toggles during write |
| CE | Chip Enable | Active-low selection signal; 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; controls data bus drive; high during write cycles to prevent contention |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data; combined with CE for robust noise-immune programming |
| VCC | Power Supply | +5 V ±10% primary supply; internal VCC sense disables writes below 3.8 V typical |
| GND | Ground Reference | Signal and power return plane; decoupling required within 10 mm of VCC pin per MIL-HDBK-454 |
| DC (Pins 1, 17) | Don't Connect | No internal connection; must remain unconnected and unbonded per CLCC mechanical specification |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Data Protection | VCC sense, 5 ms power-on delay, and <15 ns noise filtering on WE/CE prevent spurious writes during power transients |
| Software Data Protection (SDP) | User-enabled/disabled via 3-byte command sequence; remains active through power cycles to guard boot code integrity |
| Page Write Operation | 64-byte internal latch allows burst programming without CPU address/data bus hold - reduces firmware update time by 94% vs. byte-write |
| Write Completion Detection | DATA Polling (I/O7 complement → true data) and Toggle Bit (I/O6 toggling → stable) provide dual deterministic status reporting |
| Extended Identification Space | 64-byte user-accessible EEPROM region (7FC0H–7FFFH) at 12 V on A9 enables secure device serialization and calibration storage |
Applications
| Avionics Flight Control | Military Radio Firmware |
|---|---|
Use Scenario: Storing real-time trim coefficients and sensor calibration tables in fly-by-wire flight computers operating at −55°C to +125°C. IC Role / Device Role / Timing Role: Nonvolatile configuration memory with deterministic 150 ns read latency and 10 ms page write for periodic in-flight updates. Use Value: Eliminates need for external write-protection logic while maintaining MIL-STD-883 qualification for vibration and thermal shock. |
Use Scenario: Holding encrypted waveform definitions and channel mapping tables in SDR-based tactical radios deployed in desert environments. IC Role / Device Role / Timing Role: Secure firmware repository with SDP-enabled write lock and 100,000-cycle endurance for field reprogramming. Use Value: Prevents accidental overwrites during RF interference events using hardware VCC-sense and software command validation. |
| Spacecraft Onboard Computer | Tank Fire Control System |
Use Scenario: Retaining boot loader checksums and fault history logs in radiation-hardened satellite subsystems with 10-year orbital lifetime. IC Role / Device Role / Timing Role: Radiation-tolerant EEPROM with 10-year data retention at +125°C and hermetic CLCC packaging. Use Value: Meets NASA EEE-INST-002 Class 1 requirements without derating, reducing qualification overhead. |
Use Scenario: Storing ballistic solution parameters and gun elevation offsets in armored vehicle fire control units exposed to shock and EMI. IC Role / Device Role / Timing Role: High-reliability memory with MIL-STD-883 screening, 64-byte page write, and dual-status polling for deterministic update verification. Use Value: Enables field updates under combat conditions with guaranteed write completion detection via I/O6 toggle or I/O7 polling. |
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, 28-pin CERDIP package instead of 32-pad CLCC; no DC pins; different thermal resistance (θJA = 120°C/W vs. 95°C/W) | Preferred for through-hole PCB assembly with legacy socket compatibility; lower pin count but reduced thermal margin | Select when board layout uses MIL-STD-1553 backplane connectors requiring 28-pin footprint and manual rework is acceptable |
| DS2502-E48+ | 1-Wire interface EEPROM (4 kbit), not parallel; no page write; 10,000-cycle endurance; operates at 2.8–5.25 V | Suitable only for low-bandwidth parameter storage (e.g., calibration IDs); incompatible with memory-mapped bus architectures | Choose only for distributed sensor nodes where wiring reduction outweighs speed and capacity loss - not a functional substitute |
Compared with AT28C256E-15LM/883, the AT28C256-15DM/883 offers identical electrical behavior in a legacy CERDIP form factor but sacrifices thermal performance and hermeticity, while the DS2502-E48+ abandons parallel bus compatibility entirely for 1-Wire simplicity - neither provides drop-in replacement capability.
Availability
AT28C256E-15LM/883 is available at Aetrix Electronics and suitable for avionics flight control, military radio firmware, spacecraft onboard computers, and tank fire control systems requiring stable component supply under extended temperature and radiation constraints.
Supply support for AT28C256E-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, with ISO 9001-certified manufacturing and MIL-PRF-19500 QML-V qualified processes.
The AT28C256 product line delivers radiation-tolerant, high-endurance parallel EEPROMs designed specifically for military, aerospace, and industrial systems requiring guaranteed data integrity across extreme thermal and electrical stress conditions.
FAQ
What is the maximum page write size supported by the AT28C256E-15LM/883?
The AT28C256E-15LM/883 supports up to 64 bytes per page write operation, enabled by its internal 64-byte data latch. Each byte must be loaded within 150 µs of the prior byte (tBLC), and all addresses must reside on the same page defined by A6–A14. This capability is confirmed in Section 6.8 of DS20006344A and applies directly to the AT28C256E-15LM/883 variant.
Does the AT28C256E-15LM/883 require external high-voltage circuitry for programming?
No, the AT28C256E-15LM/883 performs all write and erase operations using only the standard 5 V ±10% supply - no external 12 V programming voltage is needed during normal page or byte writes. The 12 V requirement on A9 applies exclusively to the optional device identification memory region (7FC0H–7FFFH), not to main array programming. This is specified in Section 6 and Table 6-1 of DS20006344A for the AT28C256E-15LM/883.
How is write completion detected on the AT28C256E-15LM/883?
The AT28C256E-15LM/883 provides two independent hardware methods: DATA Polling (monitoring I/O7 for transition from complement to true data) and Toggle Bit (observing I/O6 for cessation of toggling). Both are active during any write cycle and require no additional timing delays - detection begins immediately after write initiation. These mechanisms are fully documented in Sections 6.14 and 6.16 of DS20006344A for the AT28C256E-15LM/883.
Is software data protection (SDP) enabled by default on the AT28C256E-15LM/883?
No, the AT28C256E-15LM/883 ships with software data protection disabled. SDP must be explicitly enabled using the three-byte command sequence (AAH to 5555H, 55H to 2AAAH, A0H to 5555H) per Section 6.11 of DS20006344A. Once enabled, SDP persists through power cycles and requires the disable sequence (AAH→5555H, 55H→2AAAH, 80H→5555H, etc.) to deactivate - a behavior confirmed for the AT28C256E-15LM/883 in the datasheet.
What packaging standard does the AT28C256E-15LM/883 meet?
The AT28C256E-15LM/883 is packaged in a 32-pad CLCC (Ceramic Leadless Chip Carrier) conforming to MIL-STD-1835 C-12 and screened per MIL-STD-883 Method 5005 for hermeticity, thermal shock, and steady-state life testing. Pin 1 indexing and marking format (%%LM/883) align with MIL-PRF-38535 requirements, as detailed in Section 7.1 of DS20006344A.
AT28C256E-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:
- 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:
- 32-LCC (11.43x13.97)
AT28C256E-15LM/883 FAQ
1.How can I place an order for AT28C256E-15LM/883 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C256E-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 AT28C256E-15LM/883 reliable?
The price and inventory of AT28C256E-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 AT28C256E-15LM/883 is usually 5 days.
3.What payment methods are accepted for AT28C256E-15LM/883?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C256E-15LM/883 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C256E-15LM/883?
AT28C256E-15LM/883 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C256E-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 AT28C256E-15LM/883?
For technical support, including AT28C256E-15LM/883 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C256E-15LM/883 requirements.
6.How does Aetrix verify that AT28C256E-15LM/883 is sourced from the original manufacturer or authorized distributors?
All AT28C256E-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 AT28C256E-15LM/883 meets industry standards.
7.What is the process for return or replacement of AT28C256E-15LM/883?
All AT28C256E-15LM/883 units undergo pre-shipment inspection (PSI). If there is an issue with AT28C256E-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 AT28C256E-15LM/883 part is unused and in its original packaging.
Return procedure for AT28C256E-15LM/883:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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