Part Number: PCA9517A
Function: Level translating I2C-bus repeater
Package: SO, TSSOP 8 Pin Type
Manufacturer: NXP Semiconductors.
The PCA9517A is a CMOS integrated circuit that provides level shifting between low voltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) I2C-bus or SMBus applications. While retaining all the operating modes and features of the I2C-bus system during the level shifts, it also permits extension of the I2 C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL) lines, thus enabling two buses of 400 pF. Using the PCA9517A enables the system designer to isolate two halves of a bus for both voltage and capacitance.
The SDA and SCL pins are overvoltage tolerant and are high-impedance when the PCA9517A is unpowered. The 2.7 V to 5.5 V bus port B drivers behave much like the drivers on the PCA9515A device, while the adjustable voltage bus portA drivers drive more current and eliminate the static offset voltage. This results in a LOW on the port B translating into a nearly 0 V LOW on the port A which accommodates smaller voltage swings of lower voltage logic.
The static offset design of the port B PCA9517A I/O drivers prevent them from being connected to another device that has rise time accelerator including the PCA9510,PCA9511, PCA9512, PCA9513, PCA9514, PCA9515A, PCA9516A, PCA9517A (port B), or PCA9518. Port A of two or more PCA9517As can be connected together, however, to allow a star topography with port A on the common bus, and port A can be connected directly to any other buffer with static or dynamic offset voltage. Multiple PCA9517As can be connected in series, port A to port B, with nobuild-up in offset voltage with only time of flight delays to consider.
1. 2 channel, bidirectional buffer isolates capacitance and allows 400 pF on either side of
2. Voltage level translation from 0.9 V to 5.5 V and from 2.7 V to 5.5 V
3. Footprint and functional replacement for PCA9515/15A
4. I2C-bus and SMBus compatible
5. Active HIGH repeater enable input
6. Open-drain input/outputs
7. Supports arbitration and clock stretching across the repeater
8. 5V tolerant I2C-bus and enable pins
Other data sheets are available within the file:
PCA9517AD, PCA9517ADP, PCA9517ADP/DG, PCA9517ATP