XL9535 – 16-bit I2C/SMBus I/O Expander – Xinluda

The Xinluda XL9535 is a 16-bit I2C-bus and SMBus I/O port expander in a 24-pin package, featuring an open-drain interrupt output, polarity inversion, and 3 hardware address pins for up to 8 devices on a single bus.

The Xinluda XL9535 is a 24-pin CMOS integrated circuit that provides 16 bits of general-purpose parallel input/output (GPIO) expansion for most microcontroller families over a two-wire I2C-bus / SMBus interface (serial clock SCL and serial data SDA). It is functionally aligned with the popular PCA9535/TCA9535-class 16-bit expanders, making it a convenient drop-in option for designs that need additional I/O without consuming microcontroller pins.

At power-up, all 16 I/Os default to inputs. The host can then configure each line as an input or output through the on-chip Configuration register, drive outputs through the Output Port register, read pin states through the Input Port register, and selectively invert the sense of input pins through the Polarity Inversion register. An open-drain, active-LOW interrupt (INT) output is asserted whenever an input state differs from the corresponding input port register value, allowing the controller to avoid continuous I2C polling.

Key Features

• 16-bit I2C-bus / SMBus to GPIO expander (24-pin CMOS)
• Operating supply voltage range of 2.3 V to 5.5 V
• 5 V tolerant I/O ports with noise filter on SCL/SDA inputs
• 400 kHz fast-mode I2C-bus clock support
• Open-drain, active-LOW interrupt output
• Polarity Inversion register for active-HIGH or active-LOW input operation
• 16 I/O pins that default to inputs at power-on
• 3 hardware address pins (A0, A1, A2) allow up to 8 devices on one bus
• Low standby current (typically 0.25 uA, 1 uA max)
• Power-on reset initializes registers to defaults and resets the bus state machine
• Latch-up exceeds 100 mA per JESD78; ESD protection exceeds JESD22 (2000 V HBM, 200 V MM, 1000 V CDM)
• Operating temperature range of -40 C to +85 C
• Available in SOP24, SSOP24, TSSOP24, and QFN24 (4×4 mm) packages

Applications

• Microcontroller GPIO / port expansion
• Keypad, switch, and pushbutton sensing
• LED status and indicator control
• Industrial control and instrumentation
• Consumer electronics and white goods
• Servers and networking equipment status/control lines

Why Source XL9535 from Pacific Component Xchange

The XL9535 is a Xinluda part with limited authorized-distributor coverage, which can make it difficult to secure in production quantities through mainstream channels. Pacific Component Xchange specializes in hard-to-find and allocation-constrained power-management ICs, interface ICs, and optocouplers. We help engineering and procurement teams locate, verify, and source obsolete and difficult-to-find devices like the XL9535 with an emphasis on authenticity and supply-chain transparency.

Because this is a Request-For-Quote item, pricing and lead time are confirmed per order. Submit an RFQ today for current XL9535 availability, packaging options, date codes, and quantity pricing, and our sourcing specialists will respond quickly. We support global shipping and can quote across the SOP24, SSOP24, TSSOP24, and QFN24 package variants to match your bill of materials.