PCA9515A Datasheet | Texas Instruments

Features - 1 Two-Channel Bidirectional Buffers - I2C Bus and SMBus patible - Active-High Repeater-Enable Input - Open-Drain I2C I/O - 5.5-V Tolerant I2C I/O and Enable Input Support Mixed-Mode Signal Operation - Lockup-Free Operation - Acmodates Standard Mode and Fast Mode I2C Devices and Multiple Masters - Powered-Off High-Impedance I2C Pins - Latch-Up Performance Exceeds 100 m A Per JESD 78, Class II - ESD Protection Exceeds JESD 22 - 2000-V Human-Body Model (A114-A) - 200-V Machine Model (A115-A) - 1000-V Charged-Device Model (C101) 2 Description This dual bidirectional I2C buffer is operational at 2.3V to 3.6-V VCC. The PCA9515A is a Bi CMOS integrated circuit intended for I2C bus and SMBus systems applications. The device contains two identical bidirectional open-drain buffer circuits that enable I2C and similar bus systems to be extended without degradation of system performance. The PCA9515A buffers both the serial data (SDA) and serial clock (SCL) signals on the I2C bus, while retaining all the operating modes and features of the I2C system. This enables two buses of 400-p F bus capacitance to be connected in an I2C application. The I2C bus capacitance limit of 400 p F restricts the number of devices and bus length. Using the PCA9515A enables the system designer to isolate two halves of a bus, acmodating more I2C devices or longer trace lengths. The PCA9515A has an active-high enable (EN) input with an internal pullup, which allows the user to select when the repeater is active. This can be used to isolate a badly behaved slave on power-up reset. It never should change state during an I2C operation, because disabling during a bus operation hangs the bus, and enabling part way through a bus cycle could confuse the I2C parts being enabled. The EN input should change state only when the global bus and the repeater port are in an idle state, to prevent system failures. The PCA9515A also can be used to run two buses: one at 5-V interface levels and the other at...