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Microchip Technology AT17C256-10PC
- Part No.:
- AT17C256-10PC
- Manufacturer:
- Microchip Technology
- Category:
- Configuration PROMs for FPGAs
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT17C256-10PC.pdf
- Description:
- IC SERIAL CONFIG PROM 256K 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,777
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Product details
Overview
AT17C256-10PC from Atmel is a 256K-bit (262,144 × 1) serial EEPROM FPGA configuration memory operating at 5V ±5% over 0°C to +70°C, featuring programmable reset polarity, cascading CEO output, and compatibility with Xilinx XC3000/XC4000/SPARTAN®, Altera FLEX®, and Atmel AT40K/AT6000 FPGAs in master serial mode.
For engineers reviewing the AT17C256-10PC datasheet, AT17C256-10PC pinout, AT17C256-10PC application, or AT17C256-10PC equivalent, key selection criteria include 12.5 MHz max clock frequency (non-cascaded), 45 ns CE-to-data delay, CEO-driven daisy-chain capability for multi-FPGA systems, and support for in-system programming via 2-wire bus with SER_EN control.
Technical Context
The AT17C256-10PC implements a serial-access configuration memory architecture optimized for FPGA master serial mode, where CLK from the FPGA drives internal address/bit counters and DATA is delivered synchronously to DIN. Its CEO output enables deterministic chaining of multiple devices by asserting low after final bit read, enabling next device's DATA output.
It supports two hardware reset configurations: active-high RESET/OE (Condition 1) or active-low RESET/OE (Condition 2), both programmable via EEPROM byte. SER_EN must be held high during configuration loading but pulled low to enter 2-wire ISP mode, where WP, A2, and CE enable block-level write protection and device addressing.
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 ±5% (commercial grade); enables direct interface with 5V FPGA I/O without level shifting |
| Max Clock Frequency | 12.5 MHz (non-cascaded); determines minimum configuration time for target FPGA bitstream length |
| CE-to-Data Delay | 45 ns (commercial); defines minimum setup window before CLK edge for reliable data capture |
| Standby Current | 75 µA at 5V; reduces system power during FPGA initialization or idle states |
| Operating Temp | 0°C to +70°C; validated for commercial-grade embedded and industrial control applications |
| Reset Polarity | Programmable active-high or active-low via EEPROM byte; eliminates need for external inverters |
Pinout & Package
AT17C256-10PC is available in 8-pin PDIP (8P3) package per JEDEC MS-001 BA standard, with 0.300" width and through-hole mounting. Pin 1 is marked by notch or dot; package includes internal decoupling support requiring 0.2 µF VCC–GND capacitor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DATA | I/O | Three-state open-collector bidirectional pin; drives FPGA DIN during configuration; used for 2-wire ISP data exchange |
| 2 CLK | I | FPGA CCLK-synchronized input; increments internal address/bit counter on rising edge for sequential readout |
| 3 (WP) RESET/OE | I | Programmable dual-function pin: active-high or active-low reset trigger and output enable control; resets address counters when asserted |
| 4 CE | I | Chip Enable input; disables address counters and forces standby mode when high; enables DATA output when low with OE asserted |
| 5 GND | Power | Ground reference; requires 0.2 µF decoupling capacitor between VCC and GND for noise immunity |
| 6 CEO (A2) | O / I | Chip Enable Output (CEO) asserts low after last bit read to enable next EEPROM in cascade; A2 functions as device select during 2-wire ISP |
| 7 SER_EN | I | Serial Enable input; must be high for FPGA configuration loading; pulled low to activate 2-wire ISP mode |
| 8 VCC | Power | +5V ±5% supply pin; powers internal EEPROM array, logic, and charge pump for programming |
Key Features
| Feature | Design Value |
|---|---|
| In-system programmability | Enables field updates of FPGA configuration bitstreams via 2-wire bus without removing AT17C256-10PC from PCB |
| Cascadable CEO output | Supports daisy-chained configuration of multiple FPGAs using single CCLK source; eliminates external glue logic |
| Programmable reset polarity | Allows matching to FPGA reset signal timing without external inverter, reducing BOM count and layout complexity |
| Write-protection via WP pin | Hardware-enabled block lock prevents accidental overwrite of critical configuration data during system operation |
| Emulation of AT24CXXX EEPROMs | Enables reuse of existing AT24CXXX-based programming infrastructure and firmware drivers |
Applications
| Industrial PLC Configuration | Xilinx SPARTAN® FPGA Boot |
|---|---|
Use Scenario: Configuring Xilinx SPARTAN® FPGAs in programmable logic controllers deployed in factory automation environments with ambient temperatures up to +70°C. IC Role / Device Role / Timing Role: Serial configuration memory delivering bitstream to FPGA DIN under CCLK control; CEO enables expansion to multi-FPGA I/O modules. Use Value: Eliminates external microcontroller boot loader; reduces boot time by 30% vs. parallel PROM; supports hot-swap reconfiguration via SER_EN-controlled ISP. | Use Scenario: Power-on initialization of Xilinx SPARTAN®-II FPGAs in telecom line cards requiring deterministic, repeatable configuration within 100 ms. IC Role / Device Role / Timing Role: Master serial mode configurator synchronized to FPGA CCLK; RESET/OE polarity programmed to match FPGA CON pin behavior. Use Value: Guarantees bit-accurate configuration delivery at 12.5 MHz; 45 ns CE-to-data delay ensures timing margin compliance across temperature range. |
| Altera FLEX® 10K System Boot | Atmel AT40K FPGA Field Upgrade |
Use Scenario: Booting Altera FLEX® 10K FPGAs in legacy industrial motion controllers where space-constrained 8-pin PDIP footprint is required. IC Role / Device Role / Timing Role: Standalone configuration memory interfacing directly to FLEX® JTAG TDI/TDO pins via dedicated SER_EN-controlled ISP path. Use Value: Enables in-field firmware updates without board removal; 75 µA standby current extends battery-backed operation during maintenance windows. | Use Scenario: Upgrading configuration bitstreams for Atmel AT40K FPGAs in aerospace ground-test equipment requiring traceable revision control. IC Role / Device Role / Timing Role: Cascaded EEPROM node (using CEO output) providing extended memory capacity beyond single-device limits for large AT40K designs. Use Value: Supports >256K-bit bitstreams via daisy chain; TOCK delay of 35 ns ensures clean CEO assertion timing for next-device enable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FPGA configuration memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT17LV256-10PC | 3.3V ±10% supply; 10 MHz max clock (non-cascaded); higher AC delays (e.g., 60 ns TCE) | Required for 3.3V FPGA systems; not drop-in compatible due to voltage and timing mismatch | Select only when target FPGA operates at 3.3V and timing budget allows reduced clock rate |
| XCR3256XL-10VQ100I | Integrated CPLD with on-chip configuration memory; no external EEPROM needed | Eliminates discrete configuration memory but requires CPLD-based design migration | Choose for new designs seeking component count reduction; not suitable for retrofitting existing AT17C256-10PC layouts |
Compared with AT17LV256-10PC, AT17C256-10PC delivers 25% higher clock rate and tighter timing margins for 5V systems, while XCR3256XL-10VQ100I replaces the configuration memory function entirely but mandates redesign of FPGA interface logic and PCB layout.
Availability
AT17C256-10PC is available at Aetrix Electronics and suitable for industrial PLC configuration, Xilinx SPARTAN® FPGA boot, and Altera FLEX® 10K system boot requiring stable component supply across commercial temperature range.
Supply support for AT17C256-10PC 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.
The AT17 Series was designed specifically to provide cost-effective, serial-access configuration memory for SRAM-based FPGAs, emphasizing ease of integration, cascading scalability, and in-system programmability.
FAQ
What is the maximum clock frequency supported by AT17C256-10PC in non-cascaded configuration?
The AT17C256-10PC supports a maximum input clock frequency of 12.5 MHz when used in standalone (non-cascaded) configuration, as specified in the AC Characteristics table for commercial operation at 5V ±5%. This value is measured with 50 pF test load and guarantees proper counting and data delivery timing for FPGA master serial mode.
How does the CEO pin function in a cascaded AT17C256-10PC chain?
In a cascaded chain, the CEO pin of each AT17C256-10PC asserts low on the clock cycle immediately following the last bit read from its memory array. This low signal enables the DATA output driver of the next AT17C256-10PC in the chain by driving its CE input low, ensuring seamless handoff without gaps or glitches in the configuration bitstream.
Can AT17C256-10PC be used with 3.3V FPGAs?
No - AT17C256-10PC is a 5V-only device (5V ±5%) and is not electrically compatible with 3.3V FPGA I/O. For 3.3V systems, the pin-compatible AT17LV256-10PC variant must be used, which operates at 3.3V ±10% and has different AC timing parameters including reduced max clock frequency (10 MHz).
What is the purpose of the SER_EN pin on AT17C256-10PC?
The SER_EN pin on AT17C256-10PC controls entry into 2-wire in-system programming mode: it must be held high during normal FPGA configuration loading, and pulled low to enable serial programming of the EEPROM array using industry-standard programmers or Atmel's ATDH2200E kit.
Does AT17C256-10PC support write protection of configuration data?
Yes - AT17C256-10PC supports hardware write protection via the (WP) RESET/OE pin. When WP is high during programming mode (SER_EN low), the lowest memory block is locked against writes, preventing accidental corruption of critical startup configuration data while allowing updates to user-defined sections.
AT17C256-10PC 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:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT17C256-10PC FAQ
1.How can I place an order for AT17C256-10PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT17C256-10PC 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 AT17C256-10PC reliable?
The price and inventory of AT17C256-10PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT17C256-10PC is usually 5 days.
3.What payment methods are accepted for AT17C256-10PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT17C256-10PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT17C256-10PC?
AT17C256-10PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT17C256-10PC 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 AT17C256-10PC?
For technical support, including AT17C256-10PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT17C256-10PC requirements.
6.How does Aetrix verify that AT17C256-10PC is sourced from the original manufacturer or authorized distributors?
All AT17C256-10PC 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 AT17C256-10PC meets industry standards.
7.What is the process for return or replacement of AT17C256-10PC?
All AT17C256-10PC units undergo pre-shipment inspection (PSI). If there is an issue with AT17C256-10PC, 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 AT17C256-10PC part is unused and in its original packaging.
Return procedure for AT17C256-10PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT17C256-10PC 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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