TCA6424A

Part: TCA6424ARGJR — Texas Instruments

Type: 24-Bit I²C/SMBus I/O Expander

Description: 24-bit I²C and SMBus I/O expander with 1.65–5.5 V supply on both the I²C side (VCCI) and the P-port side (VCCP), bidirectional voltage-level translation, 400 kHz Fast-mode I²C, interrupt output, and reset input.

Operating Conditions:

• Supply voltage: 1.65–5.5 V (VCCI and VCCP)
• Operating temperature: -40 to 85 °C
• I²C bus: up to 400 kHz
• P-port output current: up to 10 mA high-level and 25 mA low-level (recommended)

Absolute Maximum Ratings:

• Max supply voltage: 6.5 V (VCCI and VCCP)
• Input and output voltage range: -0.5 to 6.5 V
• Continuous output low current: 25 mA (P port), 15 mA (SDA, INT)
• Continuous output high current: 25 mA (P port)
• Continuous current through GND: 200 mA
• Continuous current through VCCP: 160 mA
• Continuous current through VCCI: 10 mA
• Storage temperature: -65 to 150 °C

Key Specs:

• VCCI and VCCP supply range: 1.65–5.5 V
• Standby current: 1 μA (from feature list)
• SCL/SDA input high level: min 0.7 × VCCI
• SCL/SDA, RESET input low level: max 0.3 × VCCI
• ADDR and P-port input high level: min 0.7 × VCCP
• ADDR and P-port input low level: max 0.3 × VCCP
• SCL/SDA hysteresis (typical): 0.18 V at 1.8 V, 0.25 V at 2.5 V, 0.33 V at 3.3 V, 0.5 V at 5 V
• I/O ports are 5 V tolerant

Features:

• Bidirectional voltage-level translation and GPIO expansion between 1.8, 2.5, 3.3 and 5 V I²C buses and P-port levels
• 24 I/O pins arranged as three 8-bit ports
• Configuration, input, output and polarity inversion registers
• Open-drain active-low interrupt output (INT)
• Active-low reset input (RESET)
• Internal power-on reset; all channels power up as inputs with no glitch
• Schmitt-trigger inputs and noise filter on SCL/SDA
• Latched outputs with high-current drive for directly driving LEDs
• One address pin (ADDR) allows two devices on the same bus
• Latch-up performance exceeds 100 mA per JESD 78, Class II
• ESD: 2000 V HBM, 200 V MM, 1000 V CDM

Applications:

• General-purpose remote I/O expansion for microcontrollers over I²C/SMBus
• LED driving and indication
• Voltage-level translation between mixed-voltage I²C and I/O domains

Package:

• UQFN (32), RGJ, 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)