Infineon Technologies SL811HS

Overview

SL811HS from Cypress Semiconductor is an embedded USB 1.1 host/slave controller with integrated SIE, transceivers, and 256-byte SRAM. It operates in full-speed (12 Mbps) or low-speed (1.5 Mbps) mode under software control, supports 8-bit microprocessor bus interface with DMA in slave mode, and features auto SOF/CRC generation and 5V-tolerant I/O - deployed in industrial HMI, medical data loggers, and USB peripheral adapters.

For engineers reviewing the SL811HS datasheet, SL811HS pinout, SL811HS application, or SL811HS equivalent, key selection considerations include dual-mode USB 1.1 compliance, on-chip transceiver integration, 28-pin PLCC/48-pin TQFP package options, 3.3 V supply with 5 V–tolerant I/O, and memory-mapped register access with auto-address increment for reduced bus cycles.

Technical Context

The SL811HS implements a dual-role USB 1.1 Serial Interface Engine (SIE) with hardware-level protocol handling, including automatic CRC5/16 generation, SOF packet timing, and PID/endpoint arbitration. Its internal transceiver meets USB 1.1 electrical specifications for both full- and low-speed signaling without external components.

It uses a flexible 8-bit parallel interface with A0 address line for register/data space separation, supports indexed addressing with auto-increment to minimize bus overhead, and provides dedicated DMA handshake lines (nDRQ/nDACK) only in slave mode - enabling high-throughput peripheral transfers such as scanner or printer interfaces.

Key Specifications

Pinout & Package

SL811HS is available in 28-pin PLCC (JEDEC MO-052) and 48-pin TQFP (JEDEC MS-026) packages. Pin functions are identical across variants except for pin count and physical layout; all share the same signal naming and electrical behavior.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB host/slave controller applications.

Compared with ISP1181B and MAX3421E, the SL811HS uniquely delivers dual-mode USB 1.1 functionality over a standard 8-bit microprocessor bus with integrated transceivers - making it optimal for legacy MCU upgrades and cost-sensitive host/peripheral hybrids where parallel interface reuse is critical.

Availability

SL811HS is available at Aetrix Electronics and suitable for industrial HMI terminals, medical data loggers, USB-to-parallel adapters, and embedded printer controllers requiring stable component supply and long-term obsolescence management.

Supply support for SL811HS 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

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in programmable system-on-chip (PSoC), USB, memory, and analog solutions for industrial, automotive, and consumer markets.

The SL811HS belongs to Cypress's early embedded USB connectivity product line, designed specifically to enable USB host and peripheral functionality in resource-constrained 8-bit and 16-bit microcontroller systems without external PHY or protocol logic.

FAQ

Does SL811HS support USB 2.0?

No. The SL811HS complies exclusively with USB Specification 1.1 and supports only full-speed (12 Mbps) and low-speed (1.5 Mbps) modes. It does not implement high-speed (480 Mbps) signaling, packet splitting, or USB 2.0 hub logic. Designs requiring USB 2.0 must use alternatives such as the MAX3421E or NXP ISP1362.

Can SL811HS operate with a 3.3 V crystal?

No. The SL811HS requires either a 12 MHz or 48 MHz crystal or oscillator connected to X1/X2; crystal voltage rating is not specified in the datasheet, but standard 3.3 V or 5 V parallel-resonant crystals meeting load capacitance (10–22 pF) and ESR (≤60 Ω) requirements are compatible. The device itself runs on 3.3 V core power.

Is DMA available in host mode?

No. DMA functionality (nDRQ/nDACK handshake) is explicitly supported only in slave/peripheral mode, as confirmed in the datasheet section "DMA Controller (slave mode only)." In host mode, all data transfers are performed via programmed I/O or memory-mapped reads/writes using the 8-bit bus.

What is the purpose of the CM pin?

The CM (Clock Multiply) pin must be tied to GND when using a 48 MHz crystal or clock source to enable the internal DPLL. Leaving CM floating or pulling it high disables the PLL and forces bypass mode - which requires strict adherence to USB timing tolerances and is not recommended unless using a precision 48 MHz clock source meeting USB jitter specs.