TCA6424ARGJR

Part: TCA6424A — Texas Instruments

Type: 24-Bit I2C and SMBus I/O Expander

Description: A 24-bit I/O expander for the two-line bidirectional I2C bus, designed to provide general-purpose remote I/O expansion for microcontrollers with a wide VCC range of 1.65 V to 5.5 V, supporting bidirectional voltage-level translation and high-current drive for LEDs.

Operating Conditions:

• Supply voltage: 1.65 V to 5.5 V
• I2C bus speed: 400 kHz Fast I2C Bus

Absolute Maximum Ratings:

• Max supply voltage (VCCI, VCCP): 6.5 V
• Max continuous output low current (P port): 25 mA
• Max continuous output high current (P port): 25 mA
• Max continuous current through GND: 200 mA

Key Specs:

• Standby current consumption: 1 μA
• Schmitt-Trigger hysteresis (Vhys): 0.18 V Typ at 1.8 V, 0.25 V Typ at 2.5 V, 0.33 V Typ at 3.3 V, 0.5 V Typ at 5 V
• ESD protection (Human-body model): 2000 V
• ESD protection (Machine model): 200 V
• ESD protection (Charged-device model): 1000 V
• Latch-up performance: Exceeds 100 mA per JESD 78, class II

Features:

• Bidirectional voltage-level translation
• I2C to Parallel port expander
• 5-V Tolerant I/O ports
• Active-low reset input (RESET)
• Open-drain active-low interrupt output (INT)
• Input/output configuration register
• Polarity inversion register
• Internal power-on reset
• Power up with all channels configured as inputs
• Latched outputs with high-current drive maximum capability for directly driving LEDs

Applications:

• General-purpose remote I/O expansion for microcontrollers

Package:

• UQFN (32) - 5.00 mm × 5.00 mm

• Operating power-supply voltage range of 1.65 V to 5.5 V
• Allows bidirectional voltage-level translation and GPIO expansion between:
• -1.8-V SCL/SDA and

1.8-V, 2.5-V, 3.3-V, or 5-V P Port

• -2.5-V SCL/SDA and 1.8-V, 2.5-V, 3.3-V, or 5-V P Port
• -3.3-V SCL/SDA and 1.8-V, 2.5-V, 3.3-V, or 5-V P Port
• -5-V SCL/SDA and 1.8-V, 2.5-V, 3.3-V, or 5-V P Port
• I 2 C to Parallel port expander
• Low standby current consumption of 1 μA
• Schmitt-Trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs
• -Vhys = 0.18 V Typ at 1.8 V
• -Vhys = 0.25 V Typ at 2.5 V
• -Vhys = 0.33 V Typ at 3.3 V
• -Vhys = 0.5 V Typ at 5 V
• 5-V Tolerant I/O ports
• Active-low reset input ( RESET)
• Open-drain active-low interrupt output ( INT)
• 400-kHz Fast I 2 C Bus
• Input/output configuration register
• Polarity inversion register
• Internal power-on reset
• Power up with all channels configured as inputs
• No glitch on power up
• Noise filter on SCL/SDA inputs
• Latched outputs with high-current drive maximum 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)
• -200-V Machine model (A115-A)
• -1000-V Charged-device model (C101)

TCA6424A

SCPS193D - JULY 2010 - REVISED JANUARY 2023

If used, the exposed center pad must be connected as a secondary ground or left electrically open.

over recommended operating free-air temperature range, VCCI = 1.65 V to 5.5 V (unless otherwise noted)

over operating free-air temperature range (unless otherwise noted)

Figure 9-1 shows an application in which the TCA6424A can be used.

V CCI

• A. Device address configured as 0100000 for this example.
• B. P00 and P02-P10 are configured as inputs.
• C. P01, P11-P17, and P20-P27 are configured as outputs.
• D. Resistors are required for inputs (on P port) that may float. If a driver to an input will not let the input float, a resistor is not needed. Outputs (in the P port) do not need pullup resistors.

Figure 9-1. Typical Application

• (1) For all available packages, see the orderable addendum at the end of the datasheet.

If used, the exposed center pad must be connected as a secondary ground or left electrically open.

RGJ Package (Bottom View)