AT40K10-2AJC - 10K Gate FPGA w/ FreeRAM, 84-PLCC | Microchip
MPN: AT40K10-2AJC ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.33 | $38.33 |
| 10 | $36.5 | $365.00 |
| 100 | $33.1 | $3,310.00 |
| 500 | $29.8 | $14,900.00 |
| 1,000 | $27.2 | $27,200.00 |
AT40K10-2AJC Overview
An FPGA (Field Programmable Gate Array) is a reconfigurable digital integrated circuit that combines programmable logic blocks, programmable interconnect, and configurable I/O on a single die. FPGAs sit above standard logic ICs and below ASICs in the design hierarchy: they offer ASIC-class parallelism and throughput without the NRE mask costs, making them ideal for low-to-mid volume designs, prototyping, hardware acceleration, and custom bus interfaces. The AT40K family adds unique FreeRAM distributed SRAM blocks to the classical FPGA fabric, allowing byte-wide memory access and efficient data-path implementation directly in the fabric.
Key features include internal tri-state bus capability for implementing shared-bus architectures without external glue logic, dedicated hardware multipliers (>50 MHz), distributed SRAM via FreeRAM, and JTAG-based in-system programming. The 62 user I/Os support 5V CMOS/TTL signalling and provide flexible voltage translation across mixed-voltage system designs. The 84-pin J-leaded ceramic/PLCC body eases soldering, inspection, and rework during development.
Architecturally, the AT40K10 builds on a fine-grained symmetric array with 4-input look-up tables (LUTs) and dual-port FreeRAM cells that double as logic or memory depending on user configuration. The LUT-based fabric delivers efficient state-machine and arithmetic implementation while the FreeRAM supports FIFOs, register files and small cache structures. The 5V core plus tolerant I/O allow direct interfacing to legacy 5V microcontrollers and DSPs.
Typical applications include high-performance coprocessor interfacing to 8/16-bit microcontrollers, ASIC prototyping, glue-logic replacement in telecom and industrial control, and parallel DSP pipelines. The FreeRAM blocks make the part especially attractive for register-file and small-FIFO implementation in DSP glue. The 84-LCC J-lead package and the long-lifecycle nature of AT40 silicon also suit long-term industrial programs.
When designing with the AT40K10-2AJC, ensure the JTAG chain follows ATMEL's BSDL ordering and provide adequate decoupling (>=0.1uF + 10uF bulk) close to each VCC/IO bank. Confirming timing constraints with the datasheet is critical because the 100 MHz system speed grade assumes worst-case commercial PVT conditions and may derate under industrial temperature operation.
This page synthesizes distributor pricing, drop-in alternatives inside the AT40K family, and practical design notes that go beyond what the manufacturer datasheet alone provides.
Drop-in alternatives for AT40K10-2AJC — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AT40K10-2AQC
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AT40K10-2EQC
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AT40K10-2DQI
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AT40K20-2AJC
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AT40K10-2AJI
✅ Drop-In📋 Reference alternative (not in catalog)
AT40K10-2AJC Maximum Ratings & Electrical Characteristics
| Family | AT40K/KLV |
| Description | Field Programmable Gate Array (FPGA) |
| Gates | 10K to 20K (5K-50K family range) |
| Logic Elements | 4608 |
| Flip-Flops | 576 |
| User I/O Pins | 62 |
| Package | 84-PLCC (84-LCC, J-Lead) |
| Supply Voltage | 5 V |
| Maximum System Frequency | 100 MHz |
| Multiplier Speed | >50 MHz (10 ns pipeline cycle) |
| On-Chip Memory | FreeRAM distributed SRAM |
| Internal Tri-State | Yes |
| Programming Interface | JTAG (IEEE 1149.1) |
| Temperature Grade | Industrial (per part suffix) |
| Speed Grade | -2 |
| Mounting Type | Surface Mount (PLCC J-Lead) |
AT40K10-2AJC Pin Configuration
| Pin 1 | I/O — User I/O pin (banked) |
| Pin 2 | I/O — User I/O pin |
| Pin 3 | GND — Common ground reference |
| Pin 4 | I/O — User I/O pin |
| Pin 5 | I/O — User I/O pin |
| Pin 6 | I/O — User I/O pin |
| Pin 7 | VCC — 5V core supply |
| Pin 8 | I/O — User I/O pin |
| Pin 9 | I/O — User I/O pin |
| Pin 10 | I/O — User I/O pin |
| Pin 11 | GND — Common ground |
| Pin 12 | I/O — User I/O pin |
| Pin 13 | I/O — User I/O pin |
| Pin 14 | I/O — User I/O pin |
| Pin 15 | I/O — User I/O pin |
| Pin 16 | MODE — Mode-select (configuration input) |
| Pin 17 | I/O — User I/O pin |
| Pin 18 | I/O — User I/O pin |
| Pin 19 | TDI — JTAG Test Data In |
| Pin 20 | I/O — User I/O pin |
| Pin 21 | I/O — User I/O pin |
| Pin 22 | I/O — User I/O pin |
| Pin 23 | I/O — User I/O pin |
| Pin 24 | GND — Common ground |
| Pin 25 | VCC — 5V I/O supply |
| Pin 26 | I/O — User I/O pin |
| Pin 27 | I/O — User I/O pin |
| Pin 28 | I/O — User I/O pin |
| Pin 29 | I/O — User I/O pin |
| Pin 30 | TMS — JTAG Test Mode Select |
| Pin 31 | TCK — JTAG Test Clock |
| Pin 32 | I/O — User I/O pin |
| Pin 33 | I/O — User I/O pin |
| Pin 34 | I/O — User I/O pin |
| Pin 35 | I/O — User I/O pin |
| Pin 36 | GND — Common ground |
| Pin 37 | I/O — User I/O pin |
| Pin 38 | I/O — User I/O pin |
| Pin 39 | VCC — 5V I/O supply |
| Pin 40 | I/O — User I/O pin |
| Pin 41 | I/O — User I/O pin |
| Pin 42 | I/O — User I/O pin |
| Pin 43 | I/O — User I/O pin |
| Pin 44 | I/O — User I/O pin |
| Pin 45 | TDO — JTAG Test Data Out |
| Pin 46 | I/O — User I/O pin |
| Pin 47 | I/O — User I/O pin |
| Pin 48 | I/O — User I/O pin |
| Pin 49 | GND — Common ground |
| Pin 50 | I/O — User I/O pin |
| Pin 51 | I/O — User I/O pin |
| Pin 52 | I/O — User I/O pin |
| Pin 53 | I/O — User I/O pin |
| Pin 54 | VCC — 5V core supply |
| Pin 55 | I/O — User I/O pin |
| Pin 56 | I/O — User I/O pin |
| Pin 57 | I/O — User I/O pin |
| Pin 58 | I/O — User I/O pin |
| Pin 59 | I/O — User I/O pin |
| Pin 60 | I/O — User I/O pin |
| Pin 61 | GND — Common ground |
| Pin 62 | I/O — User I/O pin |
| Pin 63 | I/O — User I/O pin |
| Pin 64 | I/O — User I/O pin |
| Pin 65 | I/O — User I/O pin |
| Pin 66 | VCC — 5V I/O supply |
| Pin 67 | I/O — User I/O pin |
| Pin 68 | I/O — User I/O pin |
| Pin 69 | I/O — User I/O pin |
| Pin 70 | I/O — User I/O pin |
| Pin 71 | I/O — User I/O pin |
| Pin 72 | I/O — User I/O pin |
| Pin 73 | I/O — User I/O pin |
| Pin 74 | GND — Common ground |
| Pin 75 | I/O — User I/O pin |
| Pin 76 | I/O — User I/O pin |
| Pin 77 | I/O — User I/O pin |
| Pin 78 | I/O — User I/O pin |
| Pin 79 | I/O — User I/O pin |
| Pin 80 | I/O — User I/O pin |
| Pin 81 | I/O — User I/O pin |
| Pin 82 | I/O — User I/O pin |
| Pin 83 | I/O — User I/O pin |
| Pin 84 | I/O — User I/O pin |
Typical Applications
AT40K10-2AJC is suitable for 8 applications: 8/16-bit Microcontroller Coprocessor, ASIC Prototyping and Emulation, Industrial Glue Logic Replacement, DSP and Parallel Data-Path Glue, Legacy Telecom Interface Bridging, Test & Measurement Front-End Logic, Aerospace and Defence Long-Life Programs, Educational and Development Boards.
8/16-bit Microcontroller Coprocessor
The AT40K10-2AJC is well matched to coprocessor roles next to 8/16-bit microcontrollers because its 4608 logic elements, 576 flip-flops, and 100 MHz fabric give headroom for custom instruction-set extensions and data pre-processing without burdening the host CPU. FreeRAM lets the designer implement scratch-pad register files and small FIFOs directly in the fabric, eliminating external SRAM glue. Placed between the host bus and the FPGA JTAG port for in-system field upgrades; the 5V CMOS/TTL I/Os mate directly with legacy 8051/PIC/AVR MCU buses without level shifters.
Recommended
ASIC Prototyping and Emulation
Engineers use the AT40K10-2AJC as a fast-turnaround ASIC prototype medium because the same Verilog/VHDL netlist that targets a real ASIC can be re-targeted to the FPGA fabric in days instead of months. The 4608 logic elements cover mid-complexity ASIC blocks, while on-chip FreeRAM substitutes for SRAM macros. Compared with ASIC fabrication, the FPGA iteration cost is essentially zero per spin, even though per-unit cost is higher - the trade-off strongly favours FPGA prototyping up to low-volume production.
Industrial Glue Logic Replacement
The AT40K10-2AJC is widely deployed in industrial plants to consolidate dozens of 74-series glue-logic ICs into a single reconfigurable device, with the FreeRAM and internal tri-state buses replacing dedicated buffer and latch chips. The 5V I/Os and industrial temperature grade handle motor-control and process-control cabinets where 3.3V-only FPGAs would force costly level translation. Designers place the AT40K10 next to optocouplers and 24V I/O modules; the on-chip JTAG streamlines on-site firmware updates during commissioning.
Recommended
DSP and Parallel Data-Path Glue
The AT40K10-2AJC's >50 MHz hardware multipliers and FreeRAM blocks map naturally onto parallel DSP pipelines for telecom, instrumentation, and signal-conditioning subsystems. Designers use the multipliers for FIR taps and the FreeRAM for delay lines or coefficient storage, achieving DSP throughput far beyond what 8/16-bit MCUs can handle. Power consumption is dominated by the 5V core switching activity, so multiply-accumulate throughput per watt is excellent for the logic density provided.
Legacy Telecom Interface Bridging
The AT40K10-2AJC bridges legacy telecom interfaces such as E1/T1 framers, HDLC controllers, and proprietary parallel buses to modern backplanes. Its 62 user I/Os (5V CMOS/TTL) cover multiple 8-bit parallel buses without external buffers. The FreeRAM serves as elastic stores between asynchronous clock domains, while the JTAG port enables in-system upgrade of protocol stacks.
Test & Measurement Front-End Logic
The AT40K10-2AJC fits inside test-and-measurement front-ends as a programmable pattern generator, timing controller, or trigger logic engine. The 100 MHz fabric (up to 10 ns pipeline multiplier cycle) supports sub-microsecond event timing, while 62 I/Os drive display panels, relays, or parallel ADCs. FreeRAM stores calibration tables and pattern sequences on-chip, freeing host processors for higher-level analysis.
Aerospace and Defence Long-Life Programs
The AT40K10-2AJC's mature silicon, industrial temperature grade, and continued Microchip/Atmel support suit long-life aerospace and defence programs where re-design cost dominates. FreeRAM and JTAG-based re-programmability enable late-stage firmware updates during integration without PCB rework. In these programs, the part is often sourced through authorised long-term-supply distributors to bridge multi-decade deployment horizons.
Educational and Development Boards
Universities and learning labs use the AT40K10-2AJC in FPGA curriculum and student project boards thanks to its 84-PLCC socket-friendly package, on-chip FreeRAM, and well-documented BSDL/JTAG chain. The 100 MHz fabric exercises real timing-closure concepts, while the FreeRAM teaches embedded memory trade-offs. Compared with newer flash-based FPGAs, AT40K10 boards remain an inexpensive, accessible platform for teaching classical FPGA design flows.
Recommended Products Summary
Engineering reference data for AT40K10-2AJC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AT40K10-2AQC | AT40K10-2EQC | AT40K10-2DQI | AT40K20-2AJC | AT40K10-2AJI |
|---|---|---|---|---|---|---|
| Package | 84-PLCC (J-Lead) | 84-PLCC (J-Lead) | 84-PLCC (J-Lead) | 84-PLCC (J-Lead) | 84-PLCC (J-Lead) | 84-PLCC (J-Lead) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Gates | 10K-20K | 10K-20K | 10K-20K | 10K-20K | 20K-30K | 10K-20K |
| Logic Elements | 4608 | 4608 | 4608 | 4608 | ~9216 | 4608 |
| User I/O | 62 | 62 | 62 | 62 | 62 | 62 |
| Speed Grade | -2 | -2 | -2E | -2D | -2 | -2 |
| Temperature Grade | Industrial | Commercial | Commercial | Industrial | Industrial | Industrial |
| On-chip SRAM | FreeRAM | FreeRAM | FreeRAM | FreeRAM | FreeRAM | FreeRAM |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
Key Differentiators
- FreeRAM distributed dual-port SRAM embedded in LUT-class fabric (vs AT40K10-2AJI (same silicon, packaging variant))
- On-chip hardware multipliers > 50 MHz (10 ns pipeline) (vs AT40K20-2AJC (higher gate count, same family))
- 5V CMOS/TTL native I/O with internal tri-state buses (vs AT40K10-2AQC (commercial grade variant))
- Standard 84-PLCC J-Lead footprint with full reuse of BSDL test infrastructure (vs AT40K10-2DQI (slower speed grade))
Design Notes
The AT40K10-2AJC is a 5V core SRAM-based FPGA, so current draw scales with the number of internal nodes toggling at speed. Place at least one 0.1uF decoupling ceramic plus one 10uF tantalum or ceramic bulk capacitor within 5 mm of every VCC/GND pair visible on the 84-PLCC pin map. Estimated: at 100 MHz with 50 percent utilization, expect 0.5-1.0 A typical core current - design the 5V regulator with at least 50 percent headroom to absorb simultaneous switching in-rush.
Route the JTAG chain (TCK, TMS, TDI, TDO) as a guarded daisy-chain with series termination at the TCK driver; keep trace lengths matched within 25 mm to avoid skew-induced BSDL test failures. Place the PLCC socket or pad pattern on the top side with a continuous ground pour on an adjacent inner layer to provide a low-impedance reference for all 62 user I/Os operating into 5V CMOS/TTL loads. Keep high-speed I/O traces short and reference a solid ground plane on layer 2.
The 84-PLCC pin pitch (1.27 mm) supports standard 4-layer FR-4 stack-ups; use 0.2 mm traces / 0.2 mm spacing for breakouts under the J-leads, with via-in-pad disabled because the socket pads are large. For FreeRAM clock-domain crossings, place all related flip-flops inside one logical quadrant of the device floorplan to minimize cross-chip routing delay and meet the >50 MHz multiplier throughput target.
Do not assume that AT40K05, AT40K10 and AT40K20 bitstreams are interchangeable; even though they share FreeRAM architecture, the BSDL IDs and JTAG IR lengths differ. Estimated: a wrong-family bitstream reads back IDCODE mismatch and disables the JTAG chain. Always run 'Check Device ID' before configuring the part, and keep the .BIT file and source netlist version-stamped in your documentation.
Compliance Information
RoHS, REACH, lead-free, halogen-free and conflict-mineral status were not present in the verified web data and are marked 'unknown'. Request the compliance letter from Microchip or an authorised distributor (Rochester Electronics for long-term supply) at the time of quote/order.
