Microchip Technology AT17C512-10JC

Overview

AT17C512-10JC from Atmel is a 512-kilobit serial EEPROM FPGA configuration memory with 5V ±5% supply, 15 MHz max clock frequency, and programmable reset polarity. It interfaces directly with SRAM-based FPGAs (e.g., Xilinx XC4000, Altera FLEX) in Master Serial Mode and supports cascading for multi-FPGA systems.

For engineers reviewing the AT17C512-10JC datasheet, AT17C512-10JC pinout, AT17C512-10JC application, or AT17C512-10JC equivalent, key selection criteria include its 8-lead PLCC package, READY pin for power-up sequencing, in-system programmability via 2-wire bus, and compatibility with industry-standard FPGA configuration protocols.

Technical Context

The AT17C512-10JC implements a serial-access configuration memory architecture where CLK, CE, and RESET/OE signals synchronize data transfer to SRAM FPGAs without external controllers. Its internal address counter auto-resets on power-up and responds to active-Low RESET/OE pulses to ensure deterministic reconfiguration start points.

It supports two operational modes: FPGA loading mode (SER_EN = High) and 2-wire ISP mode (SER_EN = Low). In loading mode, CEO output enables daisy-chained configurators; in ISP mode, A2 and DATA/CLK form a 2-wire interface for in-circuit programming at VCC only.

Key Specifications

Pinout & Package

AT17C512-10JC uses a 20-lead Plastic Leaded Chip Carrier (PLCC) package (20J), measuring 9.78 mm × 9.78 mm × 3.68 mm, with J-lead geometry and 1.27 mm pitch. It is pin-compatible across the AT17 family and supports socketed prototyping.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FPGA configuration memory applications.

Compared with XC17S10PC44C and 25LC512-I/P, AT17C512-10JC uniquely integrates READY signaling, SER_EN-controlled ISP, and CEO-based daisy-chaining - making it optimal for industrial-grade, multi-FPGA, field-upgradable systems requiring deterministic power-up behavior.

Availability

AT17C512-10JC is available at Aetrix Electronics and suitable for industrial PLCs, Xilinx Spartan prototyping platforms, Altera FLEX10K embedded controllers, telecom line cards, and FPGA-based test equipment requiring stable component supply across extended temperature ranges.

Supply support for AT17C512-10JC 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.

The AT17 Series was designed specifically for reliable, low-risk FPGA configuration in industrial, telecom, and embedded systems - emphasizing ease of integration, in-system update capability, and robust power-up sequencing.

FAQ

What is the primary function of the AT17C512-10JC in an FPGA-based system?

The AT17C512-10JC functions as a dedicated serial configuration EEPROM that stores and delivers bitstream data to SRAM-based FPGAs during power-up or reconfiguration. It operates in Master Serial Mode, interfacing directly with FPGA control signals (CCLK, DIN, INIT) without requiring external logic. The AT17C512-10JC ensures deterministic startup via its READY pin and supports cascading for multi-FPGA systems.

Does the AT17C512-10JC support in-system programming, and how is it enabled?

Yes, the AT17C512-10JC supports in-system programming (ISP) via a 2-wire serial interface. ISP is enabled by driving the SER_EN pin Low, which activates the A2 and DATA/CLK pins for programming. During normal FPGA operation, SER_EN must be tied to VCC. The AT17C512-10JC performs all voltage generation internally - no external programming voltages are required.

What does the READY pin on the AT17C512-10JC do, and how should it be used?

The READY pin on the AT17C512-10JC is an open-collector output driven Low during power-on reset and released (tri-stated) once internal voltage regulation and initialization complete. It must be pulled up externally (e.g., 4.7 kΩ to VCC) and is typically connected to the FPGA's PROGRAM or INIT pin to delay configuration until stable power is confirmed. This prevents corrupted bitstream loading during brownout conditions.

Can the AT17C512-10JC be used with both 3.3V and 5V FPGAs?

No - the AT17C512-10JC is a 5V-only device (5V ±5% commercial, 5V ±10% industrial/military). It is not compatible with 3.3V FPGAs unless level translation is implemented. For 3.3V systems, the pin-compatible AT17LV512-10JC variant should be used instead. Both share identical pinout and functionality but differ in supply voltage tolerance and AC timing parameters.

How does cascading work with multiple AT17C512-10JC devices?

Cascading uses the CEO (Chip Enable Output) pin of one AT17C512-10JC connected to the CE (Chip Enable) pin of the next. When the first device outputs its final bit, CEO goes Low, enabling the second device's DATA output. This daisy-chain mechanism allows seamless expansion of configuration memory beyond 512 kbit. All devices share the same CLK and RESET/OE lines, and the chain resets synchronously when RESET/OE is pulsed Low.