1 Features

. I2C to Parallel port expander

. Wide power supply voltage range of 1.65 V to

5 V

. Low standby-current consumption

. Open-drain active-low interrupt output

. 5-V tolerant I/O ports

. 400-kHz Fast I2C bus

. Polarity inversion register

. Address by three hardware address pins for use of

up to eight devices

. Latched outputs with high-current drive capability

for directly driving LEDs

. Latch-up performance exceeds 100 mA per

JESD 78, class II

. ESD protection exceeds JESD 22

. 2000-V Human-Body Model (A114-A)

. 1000-V Charged-Device Model (C101)

2 Applications

. Servers

. Routers (telecom switching equipment)

. Personal computers

. Personal electronics (for example, gaming

consoles)

. Industrial automation

. Products with GPIO-limited processors

3 Description

The TCA9535 is a 24-pin device that provides 16

bits of general purpose parallel input and output (I/O)

expansion for the two-line bidirectional I2C bus or

(SMBus) protocol. The device can operate with a

power supply voltage ranging from 1.65 V to 5.5 V.

The TCA9535 consists of two 8-bit Configuration

(input or output selection), Input Port, Output Port,

and Polarity Inversion (active-high or active-low

operation) registers. At power on, the I/Os are

configured as inputs. The system controller can

enable the I/Os as either inputs or outputs by writing

to the I/O configuration bits.

The TCA9535 is identical to the TCA9555, except that

the TCA9535 does not include the internal I/O pull-up

resistor, which requires pull-ups and pull-downs on

unused I/O pins when configured as an input and

undriven.