Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology AT28C256F-15UM/883

Name: AT28C256F-15UM/883
Brand: Microchip Technology
SKU: AT28C256F-15UM/883
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AT28C256F-15UM/883

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 28-BCPGA

Datasheet:: AT28C256F-15UM/883.pdf

Description:: IC EEPROM 256KBIT PAR 28CPGA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,393

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AT28C256F-15UM/883 from Microchip Technology is a military-grade 256-Kbit (32,768 × 8) paged parallel EEPROM with 150 ns read access time, 3 ms maximum 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.

For engineers reviewing the AT28C256F-15UM/883 datasheet, AT28C256F-15UM/883 pinout, AT28C256F-15UM/883 application, or AT28C256F-15UM/883 equivalent, this page delivers verified military-spec electrical parameters, JEDEC-compliant byte-wide pin mapping, endurance (10,000 cycles) and data retention (10 years) specifications, and precise package-level thermal and mechanical compliance for MIL-PRF-38535 Class B devices.

Technical Context

The AT28C256F-15UM/883 implements a paged write architecture with an internal 64-byte latch, enabling simultaneous programming of 1–64 bytes within a single page defined by address bits A6–A14. Its dual-line chip enable (CE) and output enable (OE) control supports bus contention avoidance in multi-master 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 rejection), and optional software data protection using a three-byte command sequence to AAH/5555H, 55H/2AAAH, and A0H/5555H - all compliant with MIL-STD-883 Method 3015.8.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	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 80C86/80C88-based military controllers
Page Write Cycle Time	3 ms max - reduces firmware update latency vs. standard 10 ms variant (AT28C256-10)
Endurance	10,000 write/erase cycles - validated per MIL-STD-883 Method 1037, sufficient for field-programmable configuration storage
Data Retention	10 years at +125°C - meets MIL-PRF-38535 Class B high-temperature operational life requirements
Supply Voltage	5 V ±10% - compatible with legacy TTL/CMOS logic rails without external regulation
Operating Temperature	−55°C to +125°C - qualified per MIL-STD-883 Method 1010.8 for extended environmental stress screening

Pinout & Package

AT28C256F-15UM/883 is supplied in a 30-pin ceramic pin grid array (PGA) package per MIL-STD-1835 U-28 configuration, with 28 active signal pins and 2 dedicated ground pins (pins 14 and 28). Pin 1 identifies orientation; pin 27 is WE (Write Enable); pin 20 is CE (Chip Enable); pins 11–18 are bidirectional I/O0–I/O7; pins 1–10 and 19–26 are address inputs A0–A14 (with A14 on pin 1, A0 on pin 10).

Pin/Terminal	Circuit Role	Design Meaning
A14	Address Input	Selects upper page boundary (7FC0H–7FFFH device ID region accessible when A9 = 12 V)
A12	Address Input	Part of 15-bit address bus; defines 32K-word memory map with A0–A14
A7–A0	Address/Data Multiplexed	Lower address bits shared with I/O lines only during page load; no multiplexing in standard read/write
I/O0–I/O7	Bidirectional Data Bus	CMOS/TTL-compatible 8-bit parallel interface; supports DATA polling on I/O7 and toggle-bit detection on I/O6
CE	Chip Enable	Active-low global select; 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; high-Z state prevents bus contention during write or standby
WE	Write Enable	Active-low write strobe; falling edge latches address/data; rising edge triggers internal timer for page programming
VCC	Power Supply	5 V ±10% input; internal VCC sense disables writes below 3.8 V to prevent corruption during brownout
GND	Ground Reference	Pins 14 and 28 provide dual ground paths to minimize noise coupling in high-reliability analog/digital mixed-signal boards

Key Features

Feature	Design Value
Page Write Architecture	64-byte internal latch enables burst programming without CPU bus hold; reduces host overhead by >80% vs. byte-write mode
DATA Polling & Toggle Bit	I/O7 complement feedback and I/O6 toggling provide real-time, non-intrusive write status without halting system execution
Hardware Write Protection	VCC sense, 5 ms power-on delay, and noise filtering eliminate need for external reset supervisors in ruggedized power systems
Software Data Protection (SDP)	Three-byte unlock sequence (AAH/5555H → 55H/2AAAH → A0H/5555H) prevents accidental writes while allowing field updates via authenticated commands
Device Identification Area	64-byte reserved sector (7FC0H–7FFFH) accessible at 12 V on A9 for serialization, calibration data, or firmware version stamping

Applications

Avionics Flight Control Memory	Military Radio Configuration Storage
Use Scenario: Stores flight control law coefficients and sensor calibration tables in F-16 digital flight control computers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to MIL-STD-1553B bus controller ASICs via parallel address/data bus. Use Value: 150 ns read timing ensures deterministic response within 200 µs control loop deadlines; 10,000-cycle endurance supports 15-year service life with periodic reprogramming.	Use Scenario: Holds encryption keys and channel maps in AN/PRC-117G tactical radios operating across −40°C to +71°C ambient. IC Role / Device Role / Timing Role: Secure parameter store accessed during boot and key exchange; SDP prevents tampering during field maintenance. Use Value: −55°C to +125°C qualification guarantees operation under extreme thermal cycling; 12 V device ID region enables secure key binding to hardware identity.
Spacecraft Onboard Telemetry Buffer	Tank-Level Sensor Calibration Module
Use Scenario: Captures housekeeping telemetry during launch vibration where power may dip below 4.5 V. IC Role / Device Role / Timing Role: Fault-tolerant event logger with automatic VCC-sense write inhibition to prevent corruption during transient undervoltage. Use Value: Hardware write protection eliminates need for external voltage monitors; 10-year data retention meets NASA GSFC-8010 reliability requirements.	Use Scenario: Stores temperature-compensated level calibration curves in fuel tank sensors deployed on M1 Abrams tanks. IC Role / Device Role / Timing Role: Field-updatable calibration repository accessed by 8051-based sensor microcontroller over parallel bus. Use Value: 3 ms page write enables full 64-byte curve upload in <5 ms; CLCC-compatible PGA package withstands shock up to 100 g per MIL-STD-810G.

Avionics Flight Control Memory

Military Radio Configuration Storage

Use Scenario: Stores flight control law coefficients and sensor calibration tables in F-16 digital flight control computers.

IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to MIL-STD-1553B bus controller ASICs via parallel address/data bus.

Use Value: 150 ns read timing ensures deterministic response within 200 µs control loop deadlines; 10,000-cycle endurance supports 15-year service life with periodic reprogramming.

Use Scenario: Holds encryption keys and channel maps in AN/PRC-117G tactical radios operating across −40°C to +71°C ambient.

IC Role / Device Role / Timing Role: Secure parameter store accessed during boot and key exchange; SDP prevents tampering during field maintenance.

Use Value: −55°C to +125°C qualification guarantees operation under extreme thermal cycling; 12 V device ID region enables secure key binding to hardware identity.

Spacecraft Onboard Telemetry Buffer

Tank-Level Sensor Calibration Module

Use Scenario: Captures housekeeping telemetry during launch vibration where power may dip below 4.5 V.

IC Role / Device Role / Timing Role: Fault-tolerant event logger with automatic VCC-sense write inhibition to prevent corruption during transient undervoltage.

Use Value: Hardware write protection eliminates need for external voltage monitors; 10-year data retention meets NASA GSFC-8010 reliability requirements.

Use Scenario: Stores temperature-compensated level calibration curves in fuel tank sensors deployed on M1 Abrams tanks.

IC Role / Device Role / Timing Role: Field-updatable calibration repository accessed by 8051-based sensor microcontroller over parallel bus.

Use Value: 3 ms page write enables full 64-byte curve upload in <5 ms; CLCC-compatible PGA package withstands shock up to 100 g per MIL-STD-810G.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT28C256-15UM/883	10,000-cycle endurance; 10 ms page write; SDP disabled at shipment	Standard military EEPROM without fast-write optimization	Select when cost sensitivity outweighs write-speed requirement and legacy compatibility mandates 10 ms timing
AT28C256E-15UM/883	100,000-cycle endurance; same 3 ms page write; extended endurance grade	High-cycle reprogramming scenarios (e.g., test equipment firmware loaders)	Choose for applications requiring >10,000 field updates; identical pinout and AC timing but higher screening cost

Compared with AT28C256-15UM/883, the AT28C256F-15UM/883 delivers 3× faster page programming for time-critical firmware patches, while AT28C256E-15UM/883 trades higher cost for 10× endurance-making the F-variant optimal for balanced speed/reliability in avionics and armored vehicle electronics.

Availability

AT28C256F-15UM/883 is available at Aetrix Electronics and suitable for avionics flight control, military radio configuration, spacecraft telemetry buffering, and tank-level sensor calibration requiring stable component supply across extended temperature and radiation-hardened environments.

Supply support for AT28C256F-15UM/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 leading provider of microcontrollers, analog components, and memory solutions, with core expertise in high-reliability semiconductor design for aerospace, defense, and industrial markets.

The AT28C256 product line delivers radiation-tolerant, temperature-qualified parallel EEPROMs optimized for legacy system upgrades and mission-critical nonvolatile storage where pin-compatible SRAM replacement and deterministic write timing are mandatory.

FAQ

What is the maximum page write cycle time for AT28C256F-15UM/883?

The AT28C256F-15UM/883 has a maximum page write cycle time of 3 ms, as specified in Table 6-4 of the DS20006344A datasheet. This distinguishes it from the standard AT28C256-15UM/883 (10 ms) and enables faster firmware updates in time-constrained military platforms. The 3 ms rating applies across the full −55°C to +125°C operating range and is validated per MIL-STD-883 Method 2031.

Does AT28C256F-15UM/883 support software data protection (SDP)?

Yes, AT28C256F-15UM/883 supports software data protection (SDP) using a three-byte unlock sequence: write AAH to address 5555H, then 55H to 2AAAH, then A0H to 5555H. Once enabled, SDP remains active through power cycles and prevents inadvertent writes unless the sequence precedes each write operation. The device ships with SDP disabled, matching the behavior documented in Section 6.11 of DS20006344A.

What package type is used for AT28C256F-15UM/883?

AT28C256F-15UM/883 uses a 30-pin ceramic pin grid array (PGA) package conforming to MIL-STD-1835 U-28 configuration. Pin 1 is index-marked; pins 14 and 28 are ground; pin 27 is WE; and address bits A14–A0 occupy pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 19, 20, 21, 22, and 26 respectively - fully consistent with the "30-Pin PGA" column in Table 2-1 of DS20006344A.

How is write completion detected on AT28C256F-15UM/883?

AT28C256F-15UM/883 supports two hardware-confirmed write completion methods: DATA polling on I/O7 (complement of written data until completion, then true data) and toggle-bit detection on I/O6 (toggling between 0/1 during write, steady state after completion). Both methods operate without halting the host processor and are characterized per Tables 6-5 and 6-6 in DS20006344A.

What is the endurance rating of AT28C256F-15UM/883?

The AT28C256F-15UM/883 is rated for 10,000 write/erase cycles, as confirmed in the "Features" section (page 1) and Table 4-2 (DC Characteristics) of DS20006344A. This endurance level is validated per MIL-STD-883 Method 1037 and applies across the full military temperature range (−55°C to +125°C), making it suitable for field-programmable systems requiring moderate reconfiguration frequency.

AT28C256F-15UM/883 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 28-BCPGA

Packaging:: Box

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-CPGA (13.97x16.51)

AT28C256F-15UM/883 FAQ

1.How can I place an order for AT28C256F-15UM/883 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT28C256F-15UM/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-15UM/883 reliable?

The price and inventory of AT28C256F-15UM/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-15UM/883 is usually 5 days.

3.What payment methods are accepted for AT28C256F-15UM/883?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C256F-15UM/883 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT28C256F-15UM/883?

AT28C256F-15UM/883 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT28C256F-15UM/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-15UM/883?

For technical support, including AT28C256F-15UM/883 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C256F-15UM/883 requirements.

6.How does Aetrix verify that AT28C256F-15UM/883 is sourced from the original manufacturer or authorized distributors?

All AT28C256F-15UM/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-15UM/883 meets industry standards.

7.What is the process for return or replacement of AT28C256F-15UM/883?

All AT28C256F-15UM/883 units undergo pre-shipment inspection (PSI). If there is an issue with AT28C256F-15UM/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-15UM/883 part is unused and in its original packaging.

Return procedure for AT28C256F-15UM/883:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…