General description

The PCA9509 is a level translating I2C-bus/SMBus repeater that enables processor low voltage 2-wire serial bus to interface with standard I2C-bus or SMBus I/O. While retaining all the operating modes and features of the I2C-bus system during the level shifts, it also permits extension of the I2C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL) lines, thus enabling the I2C-bus or SMBus maximum capacitance of 400 pF on the higher voltage side. Port A allows a voltage range from 1.35 V to VCC(B) - 1.0 V and requires no external pull-up resistors due to the internal current source. Port B allows a voltage range from 3.0 V to 5.5 V and is overvoltage tolerant. Both port A and port B SDA and SCL pins are high-impedance when the PCA9509 is unpowered.

Features and benefits

■ Bidirectional buffer isolates capacitance

and allows 400 pF on port B of the device

■ Voltage level translation from port A

(1.35 V to VCC(B) - 1.0 V) to port B (3.0 V to 5.5 V)

■ Requires no external pull-up resistors on lower voltage port A

■ Active HIGH repeater enable input

■ Open-drain inputs/outputs

■ Lock-up free operation

■ Supports arbitration and clock stretching across the repeater

■ Accommodates Standard-mode and Fast-mode I2C-bus devices and multiple masters

■ Powered-off high-impedance I2C-bus pins

■ Operating supply voltage range of 1.35 V to

VCC(B) - 1.0 V on port A, 3.0 V to 5.5 V on port B

■ 5 V tolerant port B SCL, SDA and enable pins

■ 0 Hz to 400 kHz clock frequency

Remark: The maximum system operating frequency may be less than 400 kHz

because of the delays added by the repeater.

■ ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per

JESD22-C101

■ Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

■ Packages offered: TSSOP8, SO8, XQFN8

PCA9509D属于集成电路（IC） > 信号缓冲器、中继器、分离器。恩智浦半导体公司制造生产的PCA9509D信号缓冲器、中继器、分离器信号缓冲器、中继器和分离器系列中的产品适用于远距离电气互连或电缆系统的数字信息传输。所有实际互连系统都具有非理想特性，该系列产品主要用于解决数字信息传输过程中因此造成的模拟问题。此外，还有其他功能，例如不同物理接口样式之间的转换和多路复用。