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Microchip Technology AT28C256F-15JU-T
- Part No.:
- AT28C256F-15JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT28C256F-15JU-T.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:746
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Product details
Overview
AT28C256F-15JU-T from Microchip Technology is an industrial-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 and DATA Polling for end-of-write detection, used in embedded system configuration storage and firmware parameter retention.
For engineers reviewing the AT28C256F-15JU-T datasheet, AT28C256F-15JU-T pinout, AT28C256F-15JU-T application, or AT28C256F-15JU-T equivalent, key selection criteria include JEDEC byte-wide pinout compatibility, 3 ms fast page write capability (vs. 10 ms standard), industrial temperature range (–40°C to +85°C), and software data protection enable/disable command sequences.
Technical Context
The AT28C256F-15JU-T implements a paged write architecture with a 64-byte internal page register, enabling up to 64 bytes to be latched and written in a single internal programming period. Address latching occurs on the falling edge of CE or WE, and data latching on the first rising edge-supporting seamless bus release during write execution.
It uses CMOS/TTL-compatible I/O with dual-line control (CE/OE) for high-impedance output management, VCC-sense and noise-filtering hardware write inhibition, and a dedicated 12V A9-based device identification area (7FC0H–7FFFH). The "F" suffix denotes the 3 ms fast write variant, distinct from the standard 10 ms version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8) - fixed byte-wide organization compatible with 8-bit microcontroller data buses |
| Read Access Time | 150 ns - enables direct replacement of SRAM in legacy 8-bit systems without timing redesign |
| Page Write Cycle Time | 3 ms max - reduces firmware update latency by 70% vs. 10 ms standard variant, critical for field-programmable devices |
| Supply Voltage | 5V ±10% - eliminates need for external voltage regulation in 5V logic systems |
| Operating Temperature | –40°C to +85°C - certified for industrial control, automotive body electronics, and power supply monitoring |
| Endurance | 10,000 write/erase cycles - validated for infrequent but mission-critical parameter storage (e.g., calibration data) |
| Data Retention | 10 years - ensures long-term reliability in unpowered storage applications without refresh circuitry |
Pinout & Package
AT28C256F-15JU-T is supplied in a 32-lead PLCC (Plastic Leaded Chip Carrier) package with JEDEC-standard byte-wide pinout. Pin 1 identifier is located at the top-left corner with a 45° chamfer per MS-016 AE specification.
| 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 | Bi-directional 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 chip select; falling edge latches address; must be low with OE low for read, high or low with WE low for write |
| OE | Output Enable | Active-low output gate; controls tri-state buffer; high during write operations to prevent bus contention |
| WE | Write Enable | Active-low write strobe; falling edge initiates byte/page write; rising edge latches data |
| VCC / GND | Power Supply | Single 5V supply with <200 µA CMOS standby current; ground reference for all I/O and internal logic |
| DC (Pins 1 & 17) | Don't Connect | No internal bond wire; must remain unconnected per datasheet to avoid functional disruption |
| NC (Pins 12 & 26) | No Connect | Unbonded pins; electrically isolated; no PCB routing required |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte Page Register | Enables burst writes without CPU bus hold; frees address/data bus after initial latch for concurrent system tasks |
| DATA Polling (I/O7) | Allows real-time write completion detection via read-back of complemented last-written byte-no timer overhead or interrupt dependency |
| Software Data Protection | Three-step command sequence (AAh/55h/A0h) enables/disables write lock; survives power cycling and protects against brown-out corruption |
| VCC Sense & Power-on Delay | Hardware inhibits writes until VCC ≥3.8V and enforces 5 ms delay post-power-up-eliminates need for external reset supervisor ICs |
| Device Identification Area | 64-byte reserved zone (7FC0H–7FFFH) accessible via 12V on A9-supports unique serialization and traceability without consuming main array space |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to 8-bit microcontrollers via parallel bus; retains settings across power cycles and hot swaps. Use Value: 3 ms page write enables rapid reconfiguration during maintenance windows; 10,000-cycle endurance exceeds typical PLC service life requirements. | Use Scenario: Holding sensor calibration coefficients, user preferences, and safety-critical operational limits in portable diagnostic equipment. IC Role / Device Role / Timing Role: Parameter EEPROM co-located with MCU; accessed during boot and runtime via standard read/write cycles with DATA Polling confirmation. Use Value: Software data protection prevents accidental overwrites during firmware updates; 10-year data retention meets FDA regulatory storage mandates. |
| Automotive Body Control Module | Telecom Power Supply Monitoring |
Use Scenario: Saving seat/mirror position memory, lighting profiles, and door lock settings in 12V automotive systems with wide input transients. IC Role / Device Role / Timing Role: Industrial-grade EEPROM tolerant of –40°C to +85°C ambient; powered from regulated 5V rail derived from vehicle battery. Use Value: VCC-sense hardware protection blocks writes during ignition cranking (low-battery dips); JEDEC pinout simplifies migration from legacy SRAM+backup battery designs. | Use Scenario: Logging fault events, thermal history, and efficiency metrics in AC/DC power supplies deployed in telecom base stations. IC Role / Device Role / Timing Role: Standalone nonvolatile logger triggered by MCU on fault detection; operates in low-power mode between writes. Use Value: 200 µA CMOS standby current minimizes quiescent drain on backup power; 150 ns read speed supports real-time status polling without interrupt latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar paged parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C256-15JU | 10 ms page write cycle; same pinout, voltage, and temperature rating | Suitable where write latency is non-critical (e.g., infrequent factory programming) | Select when cost sensitivity outweighs write-speed requirement; not drop-in for time-constrained field updates |
| M95256-DW | Serial SPI interface; 5 ms write cycle; 5V-tolerant I/O; different pin count and protocol stack | Requires MCU SPI peripheral and driver layer; lower pin count reduces PCB footprint | Choose for space-constrained designs accepting serial interface trade-offs; incompatible pinout and timing model |
Compared with AT28C256-15JU and M95256-DW, the AT28C256F-15JU-T delivers the fastest deterministic write latency (3 ms) in a JEDEC-compliant parallel package-making it optimal for applications requiring rapid, reliable parameter updates without protocol translation or layout revision.
Availability
AT28C256F-15JU-T is available at Aetrix Electronics and suitable for industrial PLC configuration storage, medical device calibration data retention, and automotive body control module parameter logging requiring stable component supply and long-term lifecycle support.
Supply support for AT28C256F-15JU-T 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 reliability standards.
The AT28C256 product line delivers high-endurance, low-power parallel EEPROMs designed for legacy 8-bit system upgrades and mission-critical nonvolatile storage where SRAM+battery backup is impractical.
FAQ
What is the maximum page write size supported by the AT28C256F-15JU-T?
The AT28C256F-15JU-T supports a maximum page write size of 64 bytes. This is enabled by its internal 64-byte page register, which allows sequential loading of 1–64 bytes within a 150 µs window (tBLC) before automatic internal programming begins. Each byte must reside on the same page, defined by address bits A6–A14.
How does DATA Polling work on the AT28C256F-15JU-T?
During a write cycle, reading the last-written address returns the complement of the data on I/O7 until completion. Once the AT28C256F-15JU-T finishes programming, true data appears on I/O7 and all outputs. This allows the host MCU to poll I/O7 without timers or interrupts-reading any location suffices, but using the last-written address gives deterministic behavior.
Is the AT28C256F-15JU-T pin-compatible with the AT28C256-15JU?
Yes, the AT28C256F-15JU-T is pin-compatible with the AT28C256-15JU. Both use identical 32-lead PLCC packaging and JEDEC byte-wide pinout. The only functional difference is the page write cycle time: 3 ms for the "F" variant versus 10 ms for the standard version. No PCB changes are required for substitution.
What voltage is required to access the device identification area in the AT28C256F-15JU-T?
The device identification area (7FC0H–7FFFH) in the AT28C256F-15JU-T requires 12.0 V ± 0.5 V applied to pin A9. This elevated voltage enables access to the dedicated 64-byte EEPROM region for serialization or tracking without affecting the main memory array. Standard 5V operation is used for all other addresses.
Does the AT28C256F-15JU-T support chip erase functionality?
Yes, the AT28C256F-15JU-T supports optional software chip erase using a 6-byte command sequence. This erases the entire 32,768-word array to FFh. The command must be issued with specific address/data patterns under CE/WE control and requires VCC ≥4.5V. Full details are in the "Software Chip Erase" section of the DS20006386B datasheet.
AT28C256F-15JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT28C256F-15JU-T FAQ
1.How can I place an order for AT28C256F-15JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C256F-15JU-T 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-15JU-T reliable?
The price and inventory of AT28C256F-15JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C256F-15JU-T is usually 5 days.
3.What payment methods are accepted for AT28C256F-15JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C256F-15JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C256F-15JU-T?
AT28C256F-15JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C256F-15JU-T 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-15JU-T?
For technical support, including AT28C256F-15JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C256F-15JU-T requirements.
6.How does Aetrix verify that AT28C256F-15JU-T is sourced from the original manufacturer or authorized distributors?
All AT28C256F-15JU-T 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-15JU-T meets industry standards.
7.What is the process for return or replacement of AT28C256F-15JU-T?
All AT28C256F-15JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT28C256F-15JU-T, 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-15JU-T part is unused and in its original packaging.
Return procedure for AT28C256F-15JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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