Analog Devices Inc. ADSP-BF535PKB-300

Overview

ADSP-BF535PKB-300 from Analog Devices is a 300 MHz Blackfin embedded processor with dual 16-bit MACs, 256 KB on-chip L2 SRAM, 32-bit PCI 2.2 interface, USB 1.1 device port, and 260-ball PBGA package. It integrates real-time clock, watchdog timer, two UARTs (one with IrDA), two SPI ports, two SPORTs, and four timers (three with PWM) for digital communication and portable Internet appliance control.

For engineers reviewing the ADSP-BF535PKB-300 datasheet, ADSP-BF535PKB-300 pinout, ADSP-BF535PKB-300 application, or ADSP-BF535PKB-300 equivalent, key selection criteria include core clock frequency (300 MHz), L1/L2 memory configuration (16K+32K+4K+256K bytes), PCI/USB peripheral support, dynamic power management modes (Full On to Deep Sleep), and 260-ball PBGA mechanical compatibility.

Technical Context

The ADSP-BF535PKB-300 implements the Blackfin Micro Signal Architecture (MSA) - a unified RISC-DSP hybrid core with dual 16×16 MACs, two 40-bit ALUs, four 8-bit video ALUs, and one 40-bit shifter. Its instruction set supports 16-bit and 32-bit opcodes, zero-overhead looping, and limited multiple-issue execution (one 32-bit + two 16-bit instructions per cycle).

Memory architecture uses hierarchical L1/L2 organization: L1 comprises 16 KB instruction SRAM/cache, 32 KB data SRAM/cache (two 16 KB banks), and 4 KB scratchpad SRAM; L2 provides 256 KB unified SRAM. The External Bus Interface Unit (EBIU) supports PC133 SDRAM (up to 512 MB across four banks) and asynchronous memory (four 64 MB banks) with glueless interfacing.

Key Specifications

Pinout & Package

ADSP-BF535PKB-300 is housed in a 260-ball plastic ball grid array (PBGA) package with 1.0 mm ball pitch, measuring 27 mm × 27 mm. The package supports standard reflow profiles and provides thermal dissipation suitable for sustained 300 MHz operation in industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar embedded processor applications.

Compared with ADSP-BF535PKB-300, the BF533 offers higher clock speed in smaller package but omits PCI and cuts L2 memory; the BF537 retains PCI and L2 capacity while adding Ethernet MAC but removes USB device functionality - making ADSP-BF535PKB-300 uniquely balanced for hybrid USB/PCI-connected embedded systems.

Availability

ADSP-BF535PKB-300 is available at Aetrix Electronics and suitable for voice over IP gateways, digital audio mixers, industrial HMI controllers, and embedded network appliances requiring stable component supply and long-term industrial lifecycle support.

Supply support for ADSP-BF535PKB-300 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

Analog Devices, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and communications infrastructure.

The Blackfin processor family was designed for embedded applications demanding real-time signal processing, deterministic control, and low-power operation - targeting digital audio, VoIP, motor control, and portable medical devices.

FAQ

What is the maximum operating frequency of the ADSP-BF535PKB-300?

The ADSP-BF535PKB-300 is rated for a maximum core clock frequency of 300 MHz under specified thermal and voltage conditions (1.3–1.6 V core supply). This frequency is achieved using the on-chip PLL with programmable multiplier settings; timing-critical peripherals like SPORT and SPI operate synchronously to derived clocks and maintain full functionality at this rate.

Does the ADSP-BF535PKB-300 support booting from external SPI flash?

Yes, the ADSP-BF535PKB-300 supports booting from external SPI flash via its dedicated SPI0 port in master mode. Boot configuration pins BOOT_CFG[3:0] must be set to 0b0010, and the on-chip boot kernel automatically initializes SPI0, reads the first 64 KB from flash, and executes from L1 instruction SRAM - enabling field-upgradable firmware without ROM programming.

Can the ADSP-BF535PKB-300 operate in deep sleep mode while retaining L1 SRAM contents?

Yes, the ADSP-BF535PKB-300 supports Deep Sleep mode with full retention of L1 instruction and data SRAM contents, as well as scratchpad SRAM. In this mode, core clocks are halted, VDD_INT is reduced to minimum leakage voltage (~1.0 V), and only RTC, watchdog timer, and wake-up sources (GPIO, UART, timer) remain active - enabling ultra-low-power standby states below 200 µA total current draw.

Is the PCI interface on the ADSP-BF535PKB-300 configurable as both master and slave?

Yes, the ADSP-BF535PKB-300's 32-bit, 33 MHz PCI 2.2 interface supports both master and slave (target) operation. As master, it can initiate memory and I/O cycles to control peripherals; as slave, it responds to host CPU accesses across PCI memory, I/O, and configuration spaces - enabling flexible system architectures such as intelligent I/O coprocessor or host bridge replacement.

What is the function of the programmable flag pins (PFX) on the ADSP-BF535PKB-300?

The ADSP-BF535PKB-300 provides sixteen bidirectional programmable flag I/O pins (PF0–PF15) that operate independently of other peripherals. Each pin can be individually configured as input or output, supports edge-triggered interrupts, and is accessible via dedicated MMRs - enabling direct GPIO control for status indication, button sensing, LED driving, or simple protocol bit-banging without consuming SPORT/SPI resources.