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Microchip Technology AT28C256E-15DM/883
- Part No.:
- AT28C256E-15DM/883
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AT28C256E-15DM/883.pdf
- Description:
- IC EEPROM 256KBIT PAR 28CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,939
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Product details
Overview
AT28C256E-15DM/883 from Microchip Technology is a military-grade 256-Kbit (32,768 × 8) paged parallel EEPROM with 150 ns read access time, 3 ms or 10 ms page write cycle time, and single 5V ±10% supply operation. It features hardware/software data protection, DATA polling and toggle-bit write completion detection, and is used in avionics control modules requiring nonvolatile storage with radiation-tolerant packaging and extended temperature operation.
For engineers reviewing the AT28C256E-15DM/883 datasheet, AT28C256E-15DM/883 pinout, AT28C256E-15DM/883 application, or AT28C256E-15DM/883 equivalent, this page delivers verified military-spec electrical parameters, JEDEC-compliant byte-wide pin mapping, endurance and retention specs per MIL-PRF-38535 Class B, and real-world substitution guidance for legacy embedded systems design and sustainment.
Technical Context
The AT28C256E-15DM/883 implements a CMOS-based paged EEPROM architecture with internal 64-byte latches and autonomous control timer, enabling up to 64-byte writes without external timing control. Its dual-line chip enable (CE) and output enable (OE) logic supports bus contention avoidance in multiprocessor memory-mapped systems.
It operates across −55°C to +125°C with absolute maximum ratings including −0.6 V to +6.25 V on all inputs and 12.0 V ±0.5 V programming voltage on A9 for device identification. The device integrates VCC sense, power-on delay, noise filtering, and software data protection (SDP) to prevent inadvertent writes during power transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8), directly replaceable in 28-pin DIP/Flatpack footprints requiring byte-wide parallel interface |
| Read Access Time | 150 ns max - enables direct replacement of SRAM in legacy MIL-STD-1553B subsystems with no wait-state insertion |
| Page Write Cycle Time | 3 ms (fast) or 10 ms (standard) - determines minimum firmware update latency for field-programmable configuration tables |
| Endurance | 10,000 or 100,000 cycles - validated per MIL-PRF-38535 Class B screening; critical for reprogrammable boot loader storage |
| Data Retention | 10 years at +125°C - qualified for sealed avionics enclosures without active thermal management |
| Supply Voltage | 5 V ±10% - compatible with legacy TTL/CMOS logic rails; eliminates need for dedicated EEPROM bias regulators |
| Operating Temperature | −55°C to +125°C - meets MIL-STD-883 Method 1010.8 temperature cycling requirements |
Pinout & Package
AT28C256E-15DM/883 is supplied in a 28-lead ceramic flatpack (Flatpack) package per MIL-STD-1835 F-12 Config B, with 0.250" body width and glass-sealed hermetic construction. Pin 1 is marked by chamfered corner; pins are gold-plated for solderability and corrosion resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-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 write completion signal |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high-Z output when high - enables memory banking in multi-device systems |
| OE | Output Enable | Active-low output gate; allows data bus sharing with other peripherals without external tri-state logic |
| WE | Write Enable | Active-low write strobe; initiates byte or page write; combined with CE and OE to define six operating modes per Table 6-1 |
| VCC | Power Supply | +5 V ±10% main supply; internal VCC sense circuitry inhibits writes below 3.8 V typical - prevents corruption during brownout |
| GND | Ground Reference | Signal and power return; decoupling capacitor placement adjacent to Pin 14 required per MIL-HDBK-454A |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-approved byte-wide pinout | Enables drop-in replacement of industry-standard 27C256 EPROMs and 62256 SRAMs in existing PCB layouts |
| Hardware data protection | VCC sense + 5 ms power-on delay + WE/CE/OE inhibit logic prevents >99.9% of spurious writes during power sequencing |
| Software data protection (SDP) | Three-step unlock sequence (AAh/55h/A0h) enables selective write-enable per memory region - essential for bootloader + application partitioning |
| 64-byte page register | Reduces firmware overhead by allowing burst writes without repeated address setup - cuts configuration update time by 8× vs. byte-write mode |
| Device identification area | 64 bytes at 7FC0h–7FFFh accessible via 12 V on A9 - supports traceability, calibration data, and field revision tagging |
Applications
| Avionics Flight Control Unit | Military Radio Firmware Storage |
|---|---|
Use Scenario: Storing flight-critical configuration tables and sensor calibration coefficients in a DO-254 Level A airborne system. IC Role / Device Role / Timing Role: Nonvolatile configuration memory mapped to microcontroller address space; accessed during power-up initialization and runtime parameter updates. Use Value: 10-year data retention at +125°C ensures integrity across aircraft service life without battery backup; 150 ns read time avoids CPU wait states. | Use Scenario: Holding encrypted firmware images and cryptographic keys in a Type 1 NSA-certified secure radio platform. IC Role / Device Role / Timing Role: Secure boot memory with software data protection enabled; write-protected except during authenticated firmware upgrade sequences. Use Value: SDP lock prevents unauthorized reprogramming; 100,000-cycle endurance supports frequent secure OTA updates over 15+ year deployment. |
| Tactical Vehicle Engine Control | Satellite Onboard Computer |
Use Scenario: Logging engine diagnostic codes and mission-specific tuning maps in ground vehicles operating across −40°C to +85°C ambient extremes. IC Role / Device Role / Timing Role: Field-reprogrammable parameter store interfaced via 80C86-compatible bus; updated via CAN gateway during depot maintenance. Use Value: Hermetic flatpack package withstands shock/vibration per MIL-STD-810G; 3 ms page write enables rapid map uploads during maintenance windows. | Use Scenario: Storing boot code and fault recovery routines in LEO satellite onboard computers exposed to total ionizing dose (TID) >100 krad(Si). IC Role / Device Role / Timing Role: Radiation-hardened-by-process nonvolatile memory; read during cold-start reset; write only during ground-commanded safe-mode updates. Use Value: CMOS process and screening per MIL-PRF-38535 Class B provide demonstrated TID tolerance; 10,000-cycle endurance exceeds mission lifetime requirements. |
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, identical military screening and marking; differs only in SDP state (disabled vs. enabled) | No functional difference in read operation; write requires SDP unlock sequence only if enabled | Select AT28C256E-15DM/883 when factory-default unprotected operation is required for legacy system compatibility |
| DS2502-E48+ | 1-Wire serial interface, 1024-bit EEPROM; no parallel bus, no page write, no military temp range | Used in low-pin-count, low-bandwidth applications like calibration ID tags - not suitable for memory-mapped firmware storage | Choose DS2502-E48+ only for simple identification storage where bus simplicity outweighs speed and density requirements |
Compared with AT28C256-15DM/883, the E-suffix variant offers identical timing and endurance but ships with software data protection disabled - simplifying integration into systems lacking SDP-aware firmware. DS2502-E48+ trades parallel bandwidth and military qualification for ultra-low pin count and parasitic power operation, limiting it to auxiliary identification roles.
Availability
AT28C256E-15DM/883 is available at Aetrix Electronics and suitable for avionics control units, secure communications radios, tactical vehicle ECUs, and satellite onboard computers requiring stable component supply across extended product lifecycles.
Supply support for AT28C256E-15DM/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 leadership in automotive, industrial, and aerospace markets.
The AT28C256 product line delivers radiation-tolerant, high-reliability parallel EEPROMs designed specifically for military, space, and safety-critical embedded systems requiring long-term data integrity and guaranteed manufacturability.
FAQ
What does the "E" suffix in AT28C256E-15DM/883 indicate?
The "E" suffix in AT28C256E-15DM/883 denotes that software data protection (SDP) is factory-disabled. This allows immediate write access without executing the three-byte unlock sequence (AAh/55h/A0h), simplifying integration into legacy systems where SDP is not implemented in firmware. All other electrical, timing, and reliability specifications match the base AT28C256-15DM/883.
Does AT28C256E-15DM/883 support page write operations, and what is the maximum page size?
Yes, AT28C256E-15DM/883 supports page write operations with a maximum page size of 64 bytes. The device uses internal address and data latches to accept up to 64 bytes within a 150 µs window (tBLC), after which it automatically executes the internal programming cycle. Page boundaries are defined by address bits A6–A14, and all bytes in a single page write must reside on the same page.
How is write completion detected on AT28C256E-15DM/883?
AT28C256E-15DM/883 supports two hardware-confirmed write completion methods: DATA polling on I/O7 (complement of written data until completion) and toggle-bit detection on I/O6 (repeated toggling until write ends). Both methods are valid during any phase of the write cycle and require no external timing components - enabling deterministic firmware synchronization without fixed delays.
What packaging and screening standards apply to AT28C256E-15DM/883?
AT28C256E-15DM/883 is packaged in a 28-lead ceramic flatpack per MIL-STD-1835 F-12 Config B and screened to MIL-PRF-38535 Class B requirements. It undergoes temperature cycling, burn-in, and parametric testing per Method 1010.8 and 1015, with full traceability to lot code YQyywwl format and compliance to 5962-88525 specification - confirming suitability for military and space applications.
Can AT28C256E-15DM/883 be used as a direct replacement for AT28C256-15DM/883 in existing designs?
Yes, AT28C256E-15DM/883 is a pin- and function-compatible replacement for AT28C256-15DM/883, differing only in factory-default SDP state (disabled vs. enabled). No PCB or firmware changes are required unless the original design relies on SDP being enabled. Electrical characteristics, timing, package dimensions, and military screening are identical - ensuring seamless drop-in qualification.
AT28C256E-15DM/883 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm)
- 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:
- Through Hole
- Supplier Device Package:
- 28-CerDip
AT28C256E-15DM/883 FAQ
1.How can I place an order for AT28C256E-15DM/883 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C256E-15DM/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-15DM/883 reliable?
The price and inventory of AT28C256E-15DM/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-15DM/883 is usually 5 days.
3.What payment methods are accepted for AT28C256E-15DM/883?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C256E-15DM/883 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C256E-15DM/883?
AT28C256E-15DM/883 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C256E-15DM/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-15DM/883?
For technical support, including AT28C256E-15DM/883 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C256E-15DM/883 requirements.
6.How does Aetrix verify that AT28C256E-15DM/883 is sourced from the original manufacturer or authorized distributors?
All AT28C256E-15DM/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-15DM/883 meets industry standards.
7.What is the process for return or replacement of AT28C256E-15DM/883?
All AT28C256E-15DM/883 units undergo pre-shipment inspection (PSI). If there is an issue with AT28C256E-15DM/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-15DM/883 part is unused and in its original packaging.
Return procedure for AT28C256E-15DM/883:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28C256E-15DM/883 Tags
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