Ultra-low voltage, 1MHz, 8-channel I2C switch with reset

Detalles del producto

Number of channels 8 Protocols I2C Operating temperature range (°C) -40 to 125 Features Reset pin Rating Catalog Supply voltage (max) (V) 3.6
Number of channels 8 Protocols I2C Operating temperature range (°C) -40 to 125 Features Reset pin Rating Catalog Supply voltage (max) (V) 3.6
TSSOP (PW) 24 49.92 mm² 7.8 x 6.4
  • 1-to-8 bidirectional translating switches with ultra low voltage translation down to 0.65V
  • I2C Bus and SMBus compatible
  • Active-low reset input
  • 2 address pins, allowing up to 16 TCA9848 devices on the I2C bus
  • Channel selection through an I2C Bus, in any combination
  • Power up with all switch channels deselected
  • Low RON switches
  • Allows voltage-level translation between 0.65V, 0.8, 1.2V, 1.8V, 2.5V, and 3.3V
  • No glitch on power up
  • Supports hot insertion
  • Low standby current
  • Operating power-supply voltage range of 1.65V to 3.6V
  • 3.6V tolerant inputs
  • 0 to 1MHz clock frequency
  • Latch-up performance exceeds 100mA per JESD 78, class II
  • ESD protection exceeds JESD 22
    • ±2000V human-body model (A114-A)
    • ±500V charged-device model (C101)
  • 1-to-8 bidirectional translating switches with ultra low voltage translation down to 0.65V
  • I2C Bus and SMBus compatible
  • Active-low reset input
  • 2 address pins, allowing up to 16 TCA9848 devices on the I2C bus
  • Channel selection through an I2C Bus, in any combination
  • Power up with all switch channels deselected
  • Low RON switches
  • Allows voltage-level translation between 0.65V, 0.8, 1.2V, 1.8V, 2.5V, and 3.3V
  • No glitch on power up
  • Supports hot insertion
  • Low standby current
  • Operating power-supply voltage range of 1.65V to 3.6V
  • 3.6V tolerant inputs
  • 0 to 1MHz clock frequency
  • Latch-up performance exceeds 100mA per JESD 78, class II
  • ESD protection exceeds JESD 22
    • ±2000V human-body model (A114-A)
    • ±500V charged-device model (C101)

The TCA9848 device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C target address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.

The system controller can reset the TCA9848 in the event of a time-out, or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery if one of the downstream I2C buses get stuck in a low state.

The pass gates of the switches are constructed so that VDD1/VDD2 pins can be used to limit the maximum high voltage, which is passed by the TCA9848. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 0.65V, 0.8V, 1.2V, or 1.8V parts can communicate with 3.3V parts, without any additional protection. External pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 3.6V tolerant.

The TCA9848 device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C target address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.

The system controller can reset the TCA9848 in the event of a time-out, or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery if one of the downstream I2C buses get stuck in a low state.

The pass gates of the switches are constructed so that VDD1/VDD2 pins can be used to limit the maximum high voltage, which is passed by the TCA9848. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 0.65V, 0.8V, 1.2V, or 1.8V parts can communicate with 3.3V parts, without any additional protection. External pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 3.6V tolerant.

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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Fecha
* Data sheet TCA9848 Ultra Low-Voltage 8-Channel 1MHz Capable I2 C Switch datasheet PDF | HTML 29 abr 2026
Application note Multiplexer/Switch Solutions for Fast Mode Plus I2C Applications PDF | HTML 14 ene 2026

Diseño y desarrollo

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Placa de evaluación

TMUXBQB-DYYEVM — Módulo de evaluación de TMUX genérico para encapsulados BQB, DYY y PW de 16 pines

El TMUXBQB-DYYEVM permite la creación rápida de prototipos y la caracterización de CD de nuestra línea de productos TMUX que usan los encapsulados TSSOP (PW) de 16 pines, WQFN (BQB) y SOT-23 THIN (DYY).

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Pedidos y calidad

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  • Clasificación de nivel de sensibilidad a la humedad (MSL)/reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

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