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Manufacturer Part #


PCA9557 Series 5.5V 85 mA 400 kHz SMT 8-bit I2C-bus and SMBus I/O Port- HVQFN-16

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Mfr. Name: NXP
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Product Variant Information section
Date Code: 2130
Product Specification Section
Technical Attributes
Attributes Table
Interface Circuit Type: I2C/SMBus
Clock Frequency-Max: 400kHz
No of I/O Lines: 8
Supply Voltage-Nom: 2.3V to 5.5V
Supply Current: 85mA
Package Style:  TSSOP-16
Mounting Method: Surface Mount
Features & Applications

NXP is a leading semiconductor company founded by Philips more than 50 years ago. NXP creates semiconductors, system solutions and software that deliver better sensory experiences in TVs, set-top boxes, identification applications, mobile phones, cars and a wide range of other electronic devices.

The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus and I2C-bus applications. The PCA9557 consists of an 8-bit input port register, 8-bit output port register, and an I2C-bus/SMBus interface. It has low current consumption and a high-impedance open-drain output pin, IO0. The system master can enable the PCA9557's I/O as either input or output by writing to the configuration register. The system master can also invert the PCA9557 inputs by writing to the active HIGH polarity inversion register. Finally, the system master can reset the PCA9557 in the event of a time-out by asserting a LOW in the reset input. The power-on reset puts the registers in their default state and initializes the I2C-bus/SMBus state machine. The RESET pin causes the same reset/initialization to occur without de-powering the part.

The PCA9557 offers lower voltage, higher performance migration path for the PCA9556. It has an 8 general-purpose input/output expander/collector, an input/output configuration register and an active HIGH polarity inversion register. The PCA9557 features I2C-bus and SMBus interface logic, internal power-on reset, noise filter on SCL/SDA inputs, active LOW reset input and 3 address pins allowing up to 8 devices on the I2C-bus/SMBus. In addition, the PCA9557 features a high-impedance open-drain on IO0, has no glitch on power-up, but has power-up with all channels configured as inputs as well as a low standby current. The ESD protection exceeds 2000 V HBM per JESD22-A114, 150 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101 and latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA.

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Product Variant Information section