Microchip Technology AT28C256E-15LM/883-815

Overview

AT28C256E-15LM/883-815 from Microchip Technology is a military-grade 256-Kbit (32,768 × 8) paged parallel EEPROM with 150 ns read access time, JEDEC-approved byte-wide pinout, and single 5V ±10% supply operation. It supports automatic 1–64-byte page writes with internal latching and timer, DATA Polling for write completion detection, and hardware/software data protection-used in avionics control modules requiring nonvolatile configuration storage under extended temperature cycling.

For engineers reviewing the AT28C256E-15LM/883-815 datasheet, AT28C256E-15LM/883-815 pinout, AT28C256E-15LM/883-815 application, or AT28C256E-15LM/883-815 equivalent, this page delivers verified military-spec electrical parameters, MIL-STD-883-compliant package mapping (32-pad CLCC), endurance (100,000 cycles), data retention (10 years), and real-world timing behavior including tWC ≤10 ms and tBLC ≤150 µs.

Technical Context

The AT28C256E-15LM/883-815 implements a static RAM-compatible parallel interface with dual-line chip enable (CE) and output enable (OE) control to prevent bus contention. Its internal 64-byte page register enables burst loading of up to 64 bytes within 150 µs per byte, with address A6–A14 defining page boundaries and A0–A5 selecting byte positions within the page.

Write completion is confirmed via DATA Polling on I/O7 (complement-to-data during write, true data after completion) or Toggle Bit behavior on I/O6. Hardware protection includes VCC sense (<3.8 V inhibits write), 5 ms power-on delay, noise filtering (<15 ns pulses rejected), and write-inhibit logic (OE low, CE high, or WE high blocks writes).

Key Specifications

Pinout & Package

AT28C256E-15LM/883-815 is packaged in a 32-pad ceramic leadless chip carrier (CLCC), compliant with MIL-STD-1835 C-12. Pins 1 and 17 are designated "Don't Connect" per datasheet DS20006344A-page 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar paged parallel EEPROM applications.

Compared with AT28C256E-15LM/883-815, the CERDIP variant offers identical timing and endurance but requires different reflow profile and mechanical mounting; the DS2502 sacrifices speed and capacity for extreme pin count reduction-neither provides drop-in replacement capability due to package and interface incompatibility.

Availability

AT28C256E-15LM/883-815 is available at Aetrix Electronics and suitable for avionics configuration storage, secure bootloader parameter retention, tactical radio frequency profile memory, and missile guidance system calibration data requiring stable component supply across extended product lifecycles.

Supply support for AT28C256E-15LM/883-815 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 a focus on industrial, automotive, and aerospace applications.

The AT28C256 product line delivers radiation-tolerant, high-reliability parallel EEPROMs designed specifically for military and space-grade systems requiring guaranteed data integrity over extreme temperature ranges and long operational lifetimes.

FAQ

What is the maximum page write size supported by the AT28C256E-15LM/883-815?

The AT28C256E-15LM/883-815 supports a maximum page write size of 64 bytes. This is enabled by its internal 64-byte page register, which latches address and data on the first write pulse and accepts up to 63 additional bytes within 150 µs (tBLC) of the prior byte. All bytes in a single page write must reside on the same page defined by address bits A6–A14.

How does the AT28C256E-15LM/883-815 indicate write completion?

The AT28C256E-15LM/883-815 provides two hardware methods to detect write completion: DATA Polling on I/O7 (which outputs the complement of the last written byte until completion, then true data) and Toggle Bit behavior on I/O6 (which toggles between 0 and 1 during write and stabilizes afterward). Both methods allow real-time polling without fixed delays.

Is the AT28C256E-15LM/883-815 compatible with standard TTL and CMOS logic levels?

Yes, the AT28C256E-15LM/883-815 features CMOS and TTL compatible inputs and outputs. Input thresholds meet VIH ≥ 2.0 V and VIL ≤ 0.8 V; output drive meets VOL ≤ 0.45 V at 2.1 mA and VOH ≥ 2.4 V at −400 µA, ensuring interoperability with legacy 5 V logic families without level-shifting circuitry.

What is the endurance rating of the AT28C256E-15LM/883-815, and how is it validated?

The AT28C256E-15LM/883-815 has an endurance rating of 100,000 write/erase cycles, denoted by the 'E' suffix in the part number. This rating is validated per MIL-STD-883 Method 1009.1 under worst-case conditions (−55°C to +125°C, VCC = 4.5 V to 5.5 V) and applies to the full memory array including the 64-byte device identification area.

Does the AT28C256E-15LM/883-815 include hardware write protection features?

Yes, the AT28C256E-15LM/883-815 incorporates multiple hardware write protection mechanisms: VCC sense circuitry inhibits writes below 3.8 V, a 5 ms power-on delay prevents writes during supply ramp-up, noise filtering rejects pulses <15 ns wide on WE/CE, and write-inhibit logic blocks writes when OE is low, CE is high, or WE is high.