PCA9519PW,112

Signal Buffers, Repeaters, Splitters Overview

The PCA9519PW,112 is a 4-channel level translating I2C-bus/SMBus repeater manufactured by NXP Semiconductors. It enables low-voltage processors to interface with standard I2C or SMBus I/O devices while retaining all system operating modes. The device provides bidirectional buffering for data (SDA) and clock (SCL) lines, allowing up to 400 pF capacitance on the higher voltage side. Port A operates at 1.0 V to VCC(B) - 1.5 V, while Port B operates at 3.0 V to 5.5 V. It supports clock frequencies from 0 Hz to 400 kHz, features an active HIGH enable pin, and includes a 50 ns glitch filter on the B-side input.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides bidirectional buffering for SDA and SCL lines to isolate capacitance and extend bus reach.
• Translates voltage levels between low-voltage Port A and standard 3.3 V or 5 V Port B without external pull-up resistors on Port A.
• Supports arbitration and clock stretching across the repeater for Standard-mode and Fast-mode I2C-bus devices.
• Features lock-up free operation using current sensing mechanisms and powered-off high-impedance pins.

Signal Buffers, Repeaters, Splitters Applications

• Connecting low-voltage CPUs running at voltages as low as 1.1 V to standard 3.3 V or 5 V I2C buses.
• Extending I2C bus length by buffering signals and supporting higher capacitance loads on the master side.
• Interfacing multiple masters on different voltage domains within a single I2C system.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and packing method. The datasheet indicates that the PW variant is typically available in reel pack configurations. Ensure compatibility with the required temperature range of -40 °C to +85 °C before finalizing procurement specifications.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when interfacing low-voltage logic (down to 1.0 V) with standard 3.3 V or 5 V I2C peripherals. It is suitable for applications requiring isolation of bus capacitance or connection of multiple masters. Ensure the design accounts for ground offset limitations on Port A to prevent signal recognition errors during low-level transitions.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9519 belongs to NXP's family of I2C-bus and SMBus interface buffers and repeaters. It is designed to facilitate communication between systems operating at different voltage levels. The PW suffix denotes the TSSOP20 plastic thin shrink small outline package, which is one of the two primary package options offered for this device series alongside the HVQFN24.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Designers should consult the official NXP website for the most current product status and potential obsolescence notices regarding this specific model number.

Signal Buffers, Repeaters, Splitters FAQ

Does the PCA9519 require external pull-up resistors on Port A?

No, Port A utilizes an internal 1 mA current source for pull-up, eliminating the need for external pull-up resistors on the lower voltage side.

What is the maximum capacitance supported on Port B?

The device allows a maximum capacitance of 400 pF on Port B due to its bidirectional buffering capabilities.

How does the device handle bus lock-up conditions?

Port A uses a current sensing mechanism to detect LOW signals, which prevents bus lock-up. Additionally, the output pull-down on Port A is set to approximately 0.2 V to ensure proper signal recognition.