AT75C220-C256

The AT75C220-C256 is a Smart Internet Appliance Processor (SIAP) featuring an ARM7TDMI 32-bit core running at 40 MHz and an integrated OakDSPCore co-processor. The device integrates networking and voice-processing focused peripherals, making it suitable for professional Internet appliance and embedded networking applications.

Designed for systems that combine control, networking and voice processing, the AT75C220-C256 delivers a compact, integrated platform with on-chip memory resources, dual 10/100 Mbps Ethernet MAC interfaces and a range of serial and peripheral interfaces.

Key Features

• Core processor  The ARM7TDMI 32-bit core operates at 40 MHz (documented as 40 MIPS in the datasheet) providing control and protocol processing for embedded systems.
• DSP co-processor  One 16-bit fixed-point OakDSPCore for signal processing (documented at 60 MIPS in the datasheet) to offload voice and media tasks.
• Memory and boot  256 × 32-bit Boot ROM and 88 KB of integrated fast RAM with an on-chip SDRAM controller and a flexible external bus interface supporting programmable chip selects.
• Dual Ethernet  Two 10/100 Mbps Ethernet MAC interfaces with voice-priority functionality, enabling direct connection to PHYs for networked appliances.
• Serial and peripheral interfaces  Industry-standard SPI, two USARTs with FIFO and modem control lines, codec interface, JTAG debug and up to 24 general-purpose I/O pins.
• Timers and system control  Three 16-bit timers/counters, an additional watchdog timer and a multi-level, individually maskable vectored interrupt controller for deterministic system management.
• Power domains  2.5 V supply for core and PLL pins and 3.3 V for other I/O pins (I/O voltage 3.3 V), enabling mixed-voltage system designs.
• Package and mounting  256-lead LFBGA / 256-BGA (15 × 15) surface-mount package for compact board-level integration.

Typical Applications

• Ethernet IP Phones  Used as the processing platform for IP phones where the OakDSPCore handles voice processing and the ARM7TDMI runs the VoIP protocol stack.
• VoIP Gateways and Telephony Endpoints  Supports telephony functions such as H.323 and other voice services through the provided DSP algorithms and networking interfaces.
• Smart Internet Appliances  Engine for embedded networked appliances offering email and networking services (POP-3/SMTP) and general Internet appliance functionality.
• Embedded Networking Equipment  Dual 10/100 Mbps MACs and flexible bus interfaces make the device suitable for compact networked embedded systems requiring integrated protocol handling.

Unique Advantages

• Highly integrated processing  ARM7TDMI plus OakDSPCore on a single chip reduces external components and simplifies board design for voice-enabled network devices.
• Dedicated voice processing path  The OakDSPCore is tuned for voice compression and acoustic processing, enabling efficient offload of media tasks from the main CPU.
• Dual Ethernet with voice priority  Two 10/100 Mbps MAC interfaces with voice-priority support direct, prioritized network connectivity for telephony and multimedia streams.
• On-chip memory and flexible bus  Boot ROM, integrated fast RAM and an SDRAM controller combined with programmable chip selects streamline system memory architecture.
• Software and development support  Available software development suites and a port of the Linux kernel plus tunable DSP algorithms reduce time-to-development for networking and voice applications.

Why Choose AT75C220-C256?

The AT75C220-C256 positions itself as an integrated solution for embedded networking and voice-processing designs, combining a 32-bit ARM7TDMI control core with a dedicated OakDSPCore and dual Ethernet MACs. Its onboard memory, SDRAM controller and programmable external bus reduce external component count while delivering the interfaces required for VoIP and Internet appliance applications.

This part is suitable for engineers building IP phones, VoIP gateways and other smart Internet appliances who need a compact, well-supported processor platform with dedicated DSP capability and a proven software ecosystem including development suites and a Linux kernel port.

Request a quote or submit an availability inquiry for the AT75C220-C256 to get pricing and lead-time information for your next design.