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Microchip Technology AT17C256-10PI
- Part No.:
- AT17C256-10PI
- Manufacturer:
- Microchip Technology
- Category:
- Configuration PROMs for FPGAs
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT17C256-10PI.pdf
- Description:
- IC SERIAL CONFIG PROM 256K 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,055
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Product details
Overview
AT17C256-10PI from Microchip Technology (formerly Atmel) is a 256 Kbit (262,144 × 1-bit) serial EEPROM FPGA configuration memory designed for master-serial mode loading of Xilinx, Altera, Lattice, and Atmel FPGAs. It operates at 5V ±10% over –40°C to +85°C industrial temperature range, supports cascading via CEO output, and features programmable reset polarity and write protection. Used in industrial embedded FPGA systems requiring reliable, nonvolatile configuration storage.
For engineers reviewing the AT17C256-10PI datasheet, AT17C256-10PI pinout, AT17C256-10PI application, or AT17C256-10PI equivalent, key selection criteria include industrial-grade 5V operation, CEO-based daisy-chain capability for multi-FPGA configurations, SER_EN-controlled 2-wire ISP, open-collector DATA interface, and compatibility with XC4000/SPARTAN/XC5200/AT40K/FLEX® devices.
Technical Context
The AT17C256-10PI implements a synchronous serial interface where FPGA CCLK drives the CLK input, and DATA is driven by the EEPROM's open-collector output to FPGA DIN. Configuration begins on power-up or FPGA CON assertion, with internal address counters auto-incremented per clock edge.
It supports two reset configurations: active-high or active-low RESET/OE polarity (user-programmable), and enables cascading only in 128K/256K variants via CEO output that asserts low after final bit read to enable next device's DATA line. SER_EN must be high during FPGA configuration and pulled low only for 2-wire programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144 × 1-bit (256 Kbit) nonvolatile EEPROM storage for full FPGA configuration bitstreams |
| Supply Voltage | 5V ±10% - supports industrial temperature range (–40°C to +85°C) without level-shifting |
| Max Clock Frequency | 12.5 MHz (standalone); 10 MHz (cascaded) - sets maximum FPGA configuration speed |
| Standby Current | 150 µA max at 5V - enables low-power system sleep modes while retaining configuration data |
| Interface Protocol | Master-serial synchronous interface - requires no external controller; FPGA drives CLK and controls CE/RESET/OE |
| Reset Polarity | Programmable active-high or active-low - eliminates need for external inverters in reset-synchronization circuits |
| Write Protection | Hardware WP input (active-high) blocks lowest memory block during 2-wire programming - prevents accidental corruption of boot sector |
Pinout & Package
AT17C256-10PI is available in 20-lead PLCC (20J), 20-lead SOIC (20S), 8-pin PDIP (8P3), and 8-lead SOIC (8S1) packages. The industrial-grade -10PI suffix denotes 5V ±10% operation over –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DATA (Pin 1, 20J/20S; Pin 1, 8P3/8S1) | Open-collector bidirectional I/O | Drives FPGA DIN during configuration; used for 2-wire serial data during programming |
| CLK (Pin 2, 20J/20S; Pin 2, 8P3/8S1) | Input | Synchronizes bit transfer and internal address counter increment; driven by FPGA CCLK |
| RESET/OE (Pin 3, 20J/20S; Pin 3, 8P3/8S1) | Input | Resets internal address/bit counters when asserted; polarity programmable (active-high or active-low) |
| CE (Pin 4, 20J/20S; Pin 4, 8P3/8S1) | Input | Enables data output driver when low with OE; forces standby mode when high (ICC ≤ 150 µA) |
| GND (Pin 5, 20J/20S; Pin 6, 8P3/8S1) | Power reference | Ground return path; requires 0.2 µF decoupling capacitor near VCC pin |
| CEO (Pin 6, 20J/20S; Pin 7, 8P3/8S1) | Output | Asserts low after last bit read to enable next EEPROM in cascade chain; not present on AT17C65 |
| SER_EN (Pin 17, 20J/20S; Pin 7, 8P3/8S1) | Input | Must be high during FPGA configuration; pulled low to enter 2-wire serial programming mode |
| VCC (Pin 20, 20J/20S; Pin 8, 8P3/8S1) | Power supply | +5V ±10% supply input; powers EEPROM core and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| Cascadable CEO output | Enables daisy-chained configuration of multiple FPGAs using single CCLK source - eliminates need for external multiplexing logic |
| Programmable reset polarity | Allows direct connection to FPGA RESET pin without external inverter - reduces BOM count and layout complexity |
| In-system programmable (ISP) | Supports field updates via 2-wire bus using SER_EN control - avoids socket removal or dedicated programmers |
| Hardware write protection (WP) | Prevents overwrite of critical configuration sectors during ISP - enhances system reliability in deployed environments |
| Low-power standby mode | Draws ≤150 µA at 5V when CE = high - suitable for battery-backed or energy-constrained industrial controllers |
Applications
| Industrial PLC FPGA Configuration | Xilinx SPARTAN-3 Multi-Device Boot |
|---|---|
|
Use Scenario: Configuring FPGA-based motion control logic in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory providing deterministic, power-loss-immune bitstream loading at startup. Use Value: Industrial temperature rating (–40°C to +85°C) and 150 µA standby current ensure long-term reliability in unventilated enclosures. |
Use Scenario: Booting multiple Xilinx SPARTAN-3 FPGAs in a modular I/O backplane where each slot hosts a separate FPGA. IC Role / Device Role / Timing Role: Cascaded configuration EEPROM enabling single-CCLK daisy-chain loading across up to four SPARTAN-3 devices. Use Value: CEO output timing (TOCK ≤ 40 ns) guarantees seamless handoff between devices without clock stretching or added glue logic. |
| Altera FLEX 10K Field Upgrade Path | Atmel AT40K Legacy System Refresh |
|
Use Scenario: Retrofitting legacy Altera FLEX 10K-based test equipment with updated configuration bitstreams via field service. IC Role / Device Role / Timing Role: In-system programmable configuration memory supporting 2-wire updates without board removal. Use Value: SER_EN-controlled ISP mode allows firmware updates using standard I²C-capable debug interfaces - no proprietary programmer required. |
Use Scenario: Maintaining aging Atmel AT40K FPGA systems in aerospace ground support equipment where obsolescence mitigation is critical. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for original AT17C256-10PC with extended industrial temperature support. Use Value: Identical 20J/20S/8P3/8S1 footprint and AC timing (TCE ≤ 45 ns, FMAX = 12.5 MHz) ensures zero hardware redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FPGA configuration memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT17LV256-10PI | 3.3V ±10% operation; lower FMAX (10 MHz); higher propagation delays (e.g., TCAC ≤ 80 ns vs. 55 ns) | Requires level-shifting for 5V FPGA systems; suited for mixed-voltage or low-power designs | Select when system uses 3.3V supply rails and can accommodate slower configuration timing |
| XCR3064XL-10VQG44I | Nonvolatile CPLD with integrated configuration memory; no external EEPROM needed | Eliminates discrete configuration memory but requires CPLD-based architecture redesign | Choose only if migrating from FPGA-only to CPLD+FPGA hybrid architecture with shared JTAG |
Compared with AT17LV256-10PI, the AT17C256-10PI delivers faster configuration (12.5 MHz vs. 10 MHz) and native 5V compatibility, avoiding level-shifters; versus XCR3064XL-10VQG44I, it preserves existing FPGA-centric design flow without CPLD integration overhead.
Availability
AT17C256-10PI is available at Aetrix Electronics and suitable for industrial PLCs, FPGA-based test equipment, aerospace ground systems, and modular I/O backplanes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT17C256-10PI 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 acquired Atmel in 2016 and maintains full support for legacy Atmel FPGA configuration products including the AT17 series.
The AT17C/LV family was designed specifically for reliable, low-pin-count serial configuration of SRAM-based FPGAs in industrial, telecom, and defense applications - emphasizing pin compatibility, cascading, and in-system programmability.
FAQ
What is the operating voltage range for AT17C256-10PI?
The AT17C256-10PI operates at 5V ±10%, supporting 4.5V to 5.5V supply across its full industrial temperature range of –40°C to +85°C. This eliminates the need for voltage regulation in 5V systems and ensures compatibility with legacy FPGA families like Xilinx XC4000 and Altera FLEX® that use 5V I/O rails.
Does AT17C256-10PI support cascading with other configuration EEPROMs?
Yes, AT17C256-10PI supports hardware cascading via its CEO (Chip Enable Output) pin, which asserts low after the final configuration bit is read. This signal enables the DATA output of the next AT17C/LV128 or AT17C/LV256 in the chain, allowing daisy-chained configuration of multiple FPGAs using a single CCLK source.
How is the reset polarity configured on AT17C256-10PI?
The reset polarity of AT17C256-10PI is user-programmable via a dedicated EEPROM byte and supported by industry-standard programming algorithms. It can be set to active-high or active-low RESET/OE, enabling direct connection to FPGA reset pins without external inverters in either condition.
What package options are available for AT17C256-10PI?
AT17C256-10PI is offered in four industry-standard packages: 20-lead PLCC (20J), 20-lead SOIC (20S), 8-pin PDIP (8P3), and 8-lead SOIC (8S1). All variants share identical pinouts and electrical specifications, enabling layout flexibility and migration between through-hole and surface-mount assembly.
Can AT17C256-10PI be programmed in-circuit?
Yes, AT17C256-10PI supports in-system programming (ISP) via its 2-wire serial interface. Bringing the SER_EN pin low enters programming mode, allowing field updates of configuration bitstreams using standard I²C-capable tools - no socket removal or dedicated programmers required.
AT17C256-10PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Programmable Type:
- Serial EEPROM
- Memory Size:
- 256Kb
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT17C256-10PI FAQ
1.How can I place an order for AT17C256-10PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT17C256-10PI 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 AT17C256-10PI reliable?
The price and inventory of AT17C256-10PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT17C256-10PI is usually 5 days.
3.What payment methods are accepted for AT17C256-10PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT17C256-10PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT17C256-10PI?
AT17C256-10PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT17C256-10PI 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 AT17C256-10PI?
For technical support, including AT17C256-10PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT17C256-10PI requirements.
6.How does Aetrix verify that AT17C256-10PI is sourced from the original manufacturer or authorized distributors?
All AT17C256-10PI 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 AT17C256-10PI meets industry standards.
7.What is the process for return or replacement of AT17C256-10PI?
All AT17C256-10PI units undergo pre-shipment inspection (PSI). If there is an issue with AT17C256-10PI, 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 AT17C256-10PI part is unused and in its original packaging.
Return procedure for AT17C256-10PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT17C256-10PI Tags
-
AT17LV512A-10PU
Microchip Technology
-
EPCQ4ASI8N
Intel
-
AT17LV256-10PU
Microchip Technology
-
AT17LV256-10NU
Microchip Technology
-
EPCQ16ASI8N
Intel
-
AT17LV010-10PU
Microchip Technology
-
EPCQ32ASI8N
Intel
-
EPCQ64ASI16N
Intel
-
EPCQ128ASI16N
Intel
-
AT17LV512A-10JU
Microchip Technology
-
AT17LV512-10JU
Microchip Technology
-
AT17LV010-10JU
Microchip Technology
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