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Microchip Technology AT28C256F-15DM/883
- Part No.:
- AT28C256F-15DM/883
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AT28C256F-15DM/883.pdf
- Description:
- IC EEPROM 256KBIT PAR 28CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,386
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Product details
Overview
AT28C256F-15DM/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-15DM/883 datasheet, AT28C256F-15DM/883 pinout, AT28C256F-15DM/883 application, or AT28C256F-15DM/883 equivalent, this device delivers deterministic nonvolatile storage with JEDEC byte-wide compatibility, MIL-STD-883 Class B screening, and 10,000 write cycles endurance in harsh thermal environments.
Technical Context
The AT28C256F-15DM/883 implements a paged architecture with an internal 64-byte latch enabling simultaneous writes of 1–64 bytes per page, where A6–A14 define the page address and A0–A5 select byte positions within the page. Its dual-line chip enable (CE) and output enable (OE) control allows flexible bus contention management during read operations.
Write completion is verified via I/O7 DATA polling (complement-to-data response) or I/O6 toggle-bit behavior, both usable at any point during tWC. Hardware protection includes VCC sense (<3.8 V inhibits write), 5 ms power-on delay, noise filtering (<15 ns pulses ignored), and CE/OE/WE logic gating - all active under −55°C to +125°C operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 256 Kbit (32,768 × 8), directly addressable without external decoding |
| Read Access Time | 150 ns max - enables direct replacement of SRAM in legacy 8-bit bus systems |
| Page Write Cycle Time | 3 ms max - reduces firmware update latency vs. byte-write-only EEPROMs |
| Endurance | 10,000 write/erase cycles - validated per MIL-STD-883 method 1037 |
| Data Retention | 10 years at +125°C - qualified for long-life aerospace deployments |
| Supply Voltage | 5 V ±10% - compatible with legacy TTL/CMOS logic rails without regulation |
| Operating Temperature | −55°C to +125°C - meets MIL-PRF-38535 Class B screening requirements |
Pinout & Package
AT28C256F-15DM/883 is supplied in a 28-lead CERDIP package (MIL-STD-1835 D-10 Config A, glass-sealed ceramic). Pin 1 is index-marked; pins 1 and 17 are "Don't Connect" (DC) per CLCC variant but not present in CERDIP - this variant uses standard 28-pin layout with no DC pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word access; 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 used for DATA polling, I/O6 for toggle-bit status |
| CE | Chip Enable | Active-low selection signal; must be low with OE low for read, or with WE low for write |
| OE | Output Enable | Active-low output gate; high-Z when asserted high, enabling bus sharing |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data; controls byte vs. page mode initiation |
| VCC | Power Supply | +5 V ±10% input; internally monitored for VCC sense write inhibition below 3.8 V |
| GND | Ground Reference | Signal and power return; decoupling required within 10 mm of VCC pin per MIL-HDBK-454 |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte Page Write Buffer | Reduces firmware update time by 64× vs. sequential byte writes; eliminates host-side timing constraints between bytes |
| DATA Polling on I/O7 | Enables deterministic write completion detection without fixed delays or external timers |
| Software Data Protection (SDP) | Three-command sequence (AAh/55h/A0h) enables/disables write lock; survives power cycling |
| MIL-STD-883 Class B Screening | Includes temperature cycling, burn-in, and hermeticity testing - certified for flight-critical subsystems |
| JEDEC Byte-Wide Pinout | Direct drop-in replacement for industry-standard 27C256 EPROMs and 62256 SRAMs in existing PCB layouts |
Applications
| Avionics Flight Control Memory | Secure Boot Configuration Storage |
|---|---|
Use Scenario: Storing real-time trim coefficients and fault history logs in fly-by-wire actuator controllers operating at −55°C to +125°C. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding calibration data updated only during ground maintenance; accessed as memory-mapped peripheral via 8-bit ISA bus. Use Value: 150 ns read access ensures zero wait-state operation with 80C188EC CPU; 10,000-cycle endurance exceeds 20-year field life requirement. | Use Scenario: Holding cryptographic keys and boot image hashes in encrypted bootloader modules for DO-178C Level A systems. IC Role / Device Role / Timing Role: Secure parameter store isolated from main application flash; write-protected via SDP until authenticated maintenance session. Use Value: Hardware VCC-sense and software lock prevent corruption during brown-out events; 10-year data retention guarantees key validity across platform lifecycle. |
| Ruggedized Industrial PLC I/O Mapping | Tactical Radio Firmware Patch Storage |
Use Scenario: Maintaining I/O module addressing tables and analog scaling factors in oilfield programmable logic controllers exposed to vibration and EMI. IC Role / Device Role / Timing Role: Parallel EEPROM mapped to dedicated memory space; updated during commissioning via RS-485 service port. Use Value: 3 ms page write enables full table reload in <50 ms; CMOS standby current <300 µA minimizes battery drain during sleep mode. | Use Scenario: Storing field-upgradable waveform definitions and encryption parameters in manpack radios operating in desert environments. IC Role / Device Role / Timing Role: Firmware patch repository accessed during cold boot; write-enabled only after secure key exchange with base station. Use Value: Toggle-bit polling allows microcontroller to remain in low-power state until write completes; 125°C rating prevents thermal derating in sealed enclosures. |
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, standard endurance (10K cycles), SDP disabled at shipment | No factory-programmed identification block; requires external write-enable sequencing | Select when cost-sensitive designs accept standard endurance and omit SDP initialization |
| AT28C256F-15LM/883 | Identical electrical specs, 32-pad CLCC package (vs. 28-lead CERDIP), pins 1/17 NC | Requires PCB redesign for leadless footprint; higher thermal resistance in conduction-cooled chassis | Select when board space constraints favor surface-mount CLCC or when hermetic lid sealing is mandated |
Compared with AT28C256-15DM/883, the AT28C256F-15DM/883 offers faster 3 ms page writes and factory-enabled fast-write mode, while AT28C256F-15LM/883 provides identical performance in a space-saving CLCC package - both retain MIL-STD-883 qualification and JEDEC pin compatibility.
Availability
AT28C256F-15DM/883 is available at Aetrix Electronics and suitable for avionics data logging, secure boot storage, and industrial PLC configuration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT28C256F-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 Inc. is a global provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, with headquarters in Chandler, Arizona and manufacturing facilities certified to ISO 9001 and AS9100 standards.
The AT28C256 product line was designed specifically for high-reliability, radiation-tolerant nonvolatile storage in defense, aerospace, and industrial control systems where data integrity under extreme thermal and electrical stress is mandatory.
FAQ
What is the maximum page write cycle time for AT28C256F-15DM/883?
The AT28C256F-15DM/883 has a maximum page write cycle time of 3 ms, as specified in Table 6-4 of the DS20006344A datasheet. This applies exclusively to the "F" variant (Fast Write), distinguishing it from the standard AT28C256-15DM/883 which requires up to 10 ms. The 3 ms value is guaranteed across the full −55°C to +125°C operating range and is validated per MIL-STD-883 test method 1037.
Does AT28C256F-15DM/883 support software data protection out of the box?
Yes, the AT28C256F-15DM/883 supports software data protection (SDP), but it is shipped with SDP disabled. Activation requires a three-byte command sequence (AAh to 5555h, 55h to 2AAAh, A0h to 5555h) followed by a write to any address. Once enabled, SDP remains active through power cycles and prevents inadvertent writes unless the same sequence precedes each write operation - a feature confirmed in Section 6.11 of the official datasheet.
What package type is used for AT28C256F-15DM/883?
The AT28C256F-15DM/883 uses a 28-lead CERDIP (Ceramic Dual Inline Package) per MIL-STD-1835 D-10 Config A, with glass-sealed construction and 0.600" body width. This is explicitly indicated by the "DM" suffix in the part number and confirmed in Section 7.1 of the DS20006344A datasheet, which maps "DM" to 28-lead CERDIP with military screening.
How is write completion detected on AT28C256F-15DM/883?
Write completion on AT28C256F-15DM/883 is detected using either DATA polling on I/O7 (where the complement of the last written byte appears until completion) or the toggle-bit method on I/O6 (which toggles between 0 and 1 during programming and stabilizes upon completion). Both methods are functional at any time during the write cycle and are electrically characterized per Tables 6-5 and 6-6 in the DS20006344A datasheet.
What is the endurance rating of AT28C256F-15DM/883?
The AT28C256F-15DM/883 is rated for 10,000 write/erase cycles, as stated in the "Features" section and Table 4-2 of the DS20006344A datasheet. This endurance level is qualified per MIL-STD-883 method 1037 and applies under specified DC and AC operating conditions including VCC = 5 V ±10% and temperature range −55°C to +125°C.
AT28C256F-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:
- 3ms
- 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
AT28C256F-15DM/883 FAQ
1.How can I place an order for AT28C256F-15DM/883 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C256F-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 AT28C256F-15DM/883 reliable?
The price and inventory of AT28C256F-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 AT28C256F-15DM/883 is usually 5 days.
3.What payment methods are accepted for AT28C256F-15DM/883?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C256F-15DM/883 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C256F-15DM/883?
AT28C256F-15DM/883 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C256F-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 AT28C256F-15DM/883?
For technical support, including AT28C256F-15DM/883 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C256F-15DM/883 requirements.
6.How does Aetrix verify that AT28C256F-15DM/883 is sourced from the original manufacturer or authorized distributors?
All AT28C256F-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 AT28C256F-15DM/883 meets industry standards.
7.What is the process for return or replacement of AT28C256F-15DM/883?
All AT28C256F-15DM/883 units undergo pre-shipment inspection (PSI). If there is an issue with AT28C256F-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 AT28C256F-15DM/883 part is unused and in its original packaging.
Return procedure for AT28C256F-15DM/883:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28C256F-15DM/883 Tags
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