PCA9516PW,112

Signal Buffers, Repeaters, Splitters Overview

The PCA9516PW,112 is a BiCMOS integrated circuit designed as a five-channel I2C hub for expanding I2C and SMBus systems. It buffers both data (SDA) and clock (SCL) lines to support up to five buses with a 400 pF capacitance limit per segment. The device operates within a supply voltage range of 3.0 V to 3.6 V and supports clock frequencies from 0 Hz to 400 kHz. It features active HIGH enable inputs, open-drain I/Os, and 5.5 V tolerant pins. The component is housed in a 16-lead TSSOP package and functions across an ambient temperature range of -40 °C to +85 °C.

Signal Buffers, Repeaters, Splitters Feature Summary

• Five bidirectional open-drain buffers expand bus capacity while maintaining standard I2C arbitration and clock stretching capabilities.
• Lock-up free operation achieved through specific low voltage level offsets between repeater inputs and outputs.
• Supports mixed voltage environments by isolating different bus segments without requiring external translation circuitry.

Signal Buffers, Repeaters, Splitters Applications

• Expanding I2C bus topology into multiple segments to overcome capacitance limits.
• Interfacing 3.3 V master devices with 5 V slave peripherals on separate bus segments.
• Isolating high-speed 400 kHz bus operations from slower 100 kHz bus segments.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the ordering suffix

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when system design requires dividing a single I2C bus into five distinct segments to manage total capacitance loads exceeding 400 pF. Ensure the application does not require cascading multiple PCA9516 units in series, as the architecture prevents this configuration. Verify that the available enable control signals can drive the active HIGH inputs to manage channel states effectively.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the PCA9516 family of five-channel I2C hubs manufactured by NXP Semiconductors (formerly Philips). The PW suffix specifically denotes the plastic thin shrink small outline package (TSSOP16), distinguishing it from the SO16 variant. It serves as a central hub repeater to isolate bus segments while preserving signal integrity across the network.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Public confirmed substitute part numbers include PCA9516D,112 for the SOIC package equivalent. Other family members like PCA9516APW,118 share similar functionality but may differ in voltage ranges or specific electrical characteristics; verify datasheet compatibility before substitution.

Signal Buffers, Repeaters, Splitters FAQ

Can multiple PCA9516 devices be connected in series?

No, the PCA9516 design does not allow series configurations. Connecting them in series causes lock-up conditions because the buffered LOW output voltage is not recognized as a regular LOW by subsequent repeaters.

How does the device handle voltage translation between bus segments?

The PCA9516 is 5.5 V tolerant on its I2C and enable pins, allowing it to interface between 3.3 V and 5 V buses without additional translation circuitry, provided each side has its own pull-up resistor.

What is the purpose of the enable pins EN1 through EN4?

These active HIGH inputs control the associated SDA and SCL ports. When LOW, they block inputs and disable output drivers, allowing unused ports to be isolated by connecting the pin to GND.

Signal Buffers, Repeaters, Splitters 112

corresponds to the TSSOP16 reel packaging configuration. Confirm that the procurement source provides the original Philips/NXP product data sheet dated September 22, 2006, or later revisions to ensure accurate electrical specifications are referenced during design integration.