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Microchip Technology AT17C256-10JC
- Part No.:
- AT17C256-10JC
- Manufacturer:
- Microchip Technology
- Category:
- Configuration PROMs for FPGAs
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
AT17C256-10JC.pdf
- Description:
- IC SER CONFIG PROM 256K 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,769
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Product details
Overview
AT17C256-10JC from Atmel is a 256K-bit (262,144 × 1) serial EEPROM FPGA configuration memory operating at 5V ±5% (commercial), featuring programmable reset polarity, cascading CEO output, and compatibility with Xilinx XC3000/XC4000/SPARTAN®, Altera FLEX®, Lucent ORCA®, and Atmel AT40K/AT6000 FPGAs in master serial mode.
For engineers reviewing the AT17C256-10JC datasheet, AT17C256-10JC pinout, AT17C256-10JC application, or AT17C256-10JC equivalent, key selection criteria include 256K-bit density, PLCC-20 package, 12.5 MHz max clock frequency (non-cascaded), programmable RESET/OE polarity, and support for in-system programming via 2-wire bus.
Technical Context
The AT17C256-10JC implements a serial-access configuration memory architecture optimized for FPGA master serial mode loading, where CLK drives internal address/bit counters and DATA outputs configuration bits synchronously to FPGA DIN. Its CEO output enables daisy-chain cascading only for 128K/256K variants, asserting low after final bit read to enable next device.
Reset polarity (active-high or active-low) is user-programmable via EEPROM byte, eliminating external inverters; SER_EN must be high during FPGA configuration and pulled low only for 2-wire ISP. Write protection (WP) is active only during programming mode (SER_EN = low) and restricts writes to lowest memory block when enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 262,144 × 1-bit (256K-bit) nonvolatile EEPROM storage for FPGA configuration bitstreams |
| Supply voltage | 5V ±5% (commercial range: 0°C to +70°C); supports industrial -40°C to +85°C with 5V ±10% |
| Max clock frequency | 12.5 MHz (non-cascaded); reduces to 10 MHz when cascading for CEO timing compliance |
| Standby current | <75 µA at 5.0V when CE = high, enabling ultra-low-power system hold states |
| Output drive | Open-collector bi-directional DATA pin compatible with FPGA DIN input logic levels and termination schemes |
| Reset polarity | Programmable active-high or active-low via EEPROM byte, eliminating need for external level-shifting circuitry |
| Cascading support | CEO output enables daisy-chain of multiple AT17C128/256 devices; AT17C65 not supported as intermediate link |
Pinout & Package
AT17C256-10JC is housed in a 20-lead Plastic J-leaded Chip Carrier (PLCC) package per JEDEC MS-018 AA, with 0.400" body width and 0.050" lead pitch. Pin 1 is marked by corner notch; leads are J-bent for surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DATA | Three-state open-collector bi-directional I/O for configuration bitstream output and 2-wire programming data |
| 2 | CLK | Input clock synchronizing internal address counter and bit shift register during FPGA load or programming |
| 3 | (WP) RESET/OE | Programmable dual-function input: active-high or active-low reset/enable controlling address counter reset and output driver enable |
| 4 | CE | Chip Enable input disabling address counters and forcing standby mode (<75 µA) when high |
| 5 | GND | Ground reference; requires 0.2 µF decoupling capacitor between VCC and GND per datasheet recommendation |
| 6 | CEO | Chip Enable Output asserted low on clock cycle following last bit read; enables next cascaded AT17C128/256 device |
| 7 | SER_EN | Serial Enable input held high during FPGA configuration; pulled low to enter 2-wire in-system programming mode |
| 8 | VCC | +5V power supply pin; operates within 4.75–5.25V (commercial) or 4.5–5.5V (industrial/military) |
| 9–20 | NC | No-connect pins; electrically isolated and must remain unconnected per design specification |
Key Features
| Feature | Design Value |
|---|---|
| In-system programmability | 2-wire serial interface (SER_EN low) enables field reprogramming without socket removal or dedicated programmers |
| Cascadable configuration | CEO output allows daisy-chaining up to multiple 128K/256K devices for larger FPGA bitstreams or multi-FPGA systems |
| Programmable reset polarity | User-configurable RESET/OE behavior eliminates external inverters and simplifies integration with diverse FPGA reset architectures |
| FPGA interface optimization | Dedicated timing parameters (TSCE, THCE, TCAC) ensure reliable bitstream delivery to Xilinx, Altera, Lucent, and Atmel FPGAs in master serial mode |
| Low-power standby | 75 µA max ICCS at 5V enables extended battery-backed or energy-sensitive embedded configurations |
Applications
| Industrial PLC Configuration | Aerospace FPGA Reconfiguration |
|---|---|
Use Scenario: Configuring Xilinx SPARTAN FPGAs in programmable logic controllers deployed in factory automation environments with wide temperature swings. IC Role / Device Role / Timing Role: Serial configuration memory providing deterministic bitstream loading at power-up or on-command, synchronized to FPGA CCLK. Use Value: Guaranteed 256K-bit storage and 12.5 MHz clock tolerance ensure full configuration integrity for safety-critical control logic under industrial thermal stress. | Use Scenario: Enabling in-flight partial reconfiguration of radiation-tolerant FPGAs in satellite payload subsystems requiring mission-adaptive logic. IC Role / Device Role / Timing Role: Cascadable EEPROM providing redundant configuration storage with CEO-driven daisy-chain sequencing for multi-FPGA payloads. Use Value: Programmable reset polarity and low standby current (<75 µA) support cold-start reliability and long-duration orbital power budgets. |
| Telecom Baseband Processing | Medical Imaging FPGA Boot |
Use Scenario: Loading configuration bitstreams into Altera FLEX FPGAs used in 5G baseband processing units requiring rapid, repeatable initialization. IC Role / Device Role / Timing Role: Master serial mode configurator interfacing directly with FPGA CON and CCLK pins to deliver bitstream without host processor intervention. Use Value: Compatibility with industry-standard FPGA families and 8-pin PDIP/SOIC/PLCC packaging simplifies board layout across telecom hardware generations. | Use Scenario: Storing diagnostic and calibration firmware for Xilinx XC4000-series FPGAs in MRI and CT scanner real-time image processing modules. IC Role / Device Role / Timing Role: Nonvolatile configuration memory ensuring deterministic boot sequence and regulatory-compliant startup behavior upon power application. Use Value: Emulation of AT24CXXX EEPROM protocol enables reuse of existing programming infrastructure while delivering 256K-bit capacity for complex imaging algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FPGA configuration memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT17LV256-10JC | 3.3V ±10% operation vs. AT17C256-10JC's 5V ±5%; lower max clock (10 MHz) and higher AC delays (e.g., TCAC = 75–80 ns) | Targeted for 3.3V FPGA systems; incompatible with 5V-only designs due to voltage mismatch and timing derating | Select AT17LV256-10JC only when system VCC is strictly 3.3V and timing margins accommodate slower AC characteristics. |
| XCR3256XL-10TQ144I | Integrated CPLD with on-chip configuration memory vs. discrete EEPROM; no CEO cascade or SER_EN programming interface | Used for glue logic + configuration in space-constrained designs; lacks serial bitstream flexibility and field reprogrammability | Choose XCR3256XL-10TQ144I only when combining logic and config memory eliminates board area and BOM count, accepting loss of cascading and ISP capability. |
Compared with AT17LV256-10JC, the AT17C256-10JC delivers higher speed (12.5 MHz vs. 10 MHz) and 5V compatibility but consumes more standby current; versus XCR3256XL-10TQ144I, it provides dedicated, field-upgradable configuration storage with daisy-chain scalability-critical for multi-FPGA systems where logic and memory separation ensures design flexibility and testability.
Availability
AT17C256-10JC is available at Aetrix Electronics and suitable for industrial PLC configuration, aerospace FPGA reconfiguration, and telecom baseband processing requiring stable component supply across commercial and industrial temperature ranges.
Supply support for AT17C256-10JC 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and FPGA configuration solutions for embedded and industrial applications.
The AT17 Series was designed specifically as low-density FPGA configuration EEPROMs to simplify bitstream storage and loading for Xilinx, Altera, Lucent, and Atmel FPGAs using master serial interface protocols.
FAQ
What is the maximum clock frequency supported by the AT17C256-10JC during non-cascaded FPGA configuration?
The AT17C256-10JC supports a maximum input clock frequency of 12.5 MHz when operating in standalone (non-cascaded) mode, as specified in its AC characteristics table for commercial 5V operation. This timing ensures reliable synchronization with FPGA CCLK inputs for bitstream delivery without setup/hold violations.
Does the AT17C256-10JC support in-system programming, and what interface is required?
Yes, the AT17C256-10JC supports in-system programming via a 2-wire serial bus. This requires pulling the SER_EN pin low to enter programming mode, after which standard I²C-compatible protocols (emulating AT24CXXX) can be used to reprogram the EEPROM without removing it from the PCB.
Can the AT17C256-10JC be used in a cascaded chain with other AT17 series devices, and which ones are compatible?
Yes, the AT17C256-10JC supports cascading via its CEO output, but only with other AT17C/LV128 or AT17C/LV256 devices. AT17C65 cannot serve as an intermediate link-it may only be placed at the end of a cascade chain or used standalone, per the functional architecture defined in the datasheet.
What does the "-10JC" suffix indicate in the AT17C256-10JC part number?
The "-10JC" suffix denotes three attributes: "10" specifies a 10 ns access time grade, "J" indicates the 20-lead PLCC package (JEDEC MS-018 AA), and "C" signifies commercial temperature range (0°C to +70°C). This full ordering code uniquely identifies the 5V, 256K-bit, PLCC-packaged variant.
How is reset polarity configured on the AT17C256-10JC, and why is this feature valuable?
Reset polarity on the AT17C256-10JC is programmed into a dedicated EEPROM byte using standard programmer algorithms-configurable as either active-high or active-low RESET/OE. This eliminates external inverters and enables seamless integration with FPGA reset architectures that vary across vendors and families, reducing BOM count and layout complexity.
AT17C256-10JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Programmable Type:
- Serial EEPROM
- Memory Size:
- 256Kb
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-PLCC (9x9)
AT17C256-10JC FAQ
1.How can I place an order for AT17C256-10JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT17C256-10JC 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 AT17C256-10JC reliable?
The price and inventory of AT17C256-10JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT17C256-10JC is usually 5 days.
3.What payment methods are accepted for AT17C256-10JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT17C256-10JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT17C256-10JC?
AT17C256-10JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT17C256-10JC 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 AT17C256-10JC?
For technical support, including AT17C256-10JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT17C256-10JC requirements.
6.How does Aetrix verify that AT17C256-10JC is sourced from the original manufacturer or authorized distributors?
All AT17C256-10JC 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 AT17C256-10JC meets industry standards.
7.What is the process for return or replacement of AT17C256-10JC?
All AT17C256-10JC units undergo pre-shipment inspection (PSI). If there is an issue with AT17C256-10JC, 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 AT17C256-10JC part is unused and in its original packaging.
Return procedure for AT17C256-10JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT17C256-10JC Tags
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AT17LV512A-10PU
Microchip Technology
-
EPCQ4ASI8N
Intel
-
AT17LV256-10PU
Microchip Technology
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AT17LV256-10NU
Microchip Technology
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EPCQ16ASI8N
Intel
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AT17LV010-10PU
Microchip Technology
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EPCQ32ASI8N
Intel
-
EPCQ64ASI16N
Intel
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EPCQ128ASI16N
Intel
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AT17LV512A-10JU
Microchip Technology
-
AT17LV512-10JU
Microchip Technology
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AT17LV010-10JU
Microchip Technology
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