PCA9512AD,112
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NXP USA Inc. PCA9512AD,112

Manufacturer No:
PCA9512AD,112
Manufacturer:
NXP USA Inc.
Package:
Tube
Description:
IC BUFFER I2C/SMBUS HOTSWAP 8SO
Delivery:
Payment:
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iso45001
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Product Introduction

Overview

The PCA9512AD,112 is a hot swappable I2C-bus and SMBus buffer produced by NXP USA Inc. This component is designed to facilitate the insertion of I/O cards into a live backplane without corrupting the data and clock buses. It features level shifting capabilities, allowing it to operate between 3.3 V and 5 V systems, and includes dedicated supply voltage pins to maintain the best noise margin for each voltage level.

Key Specifications

Parameter Description
Supply Voltage Range 2.7 V to 5.5 V
Operating Modes I2C-bus Standard mode, I2C-bus Fast mode, and SMBus standards
Level Shifting Between 3.3 V and 5 V systems
Pins Includes SDAIN, SDAOUT, SCLIN, SCLOUT, VCC, VCC2, GND, and ACC pins
Rise Time Accelerator Allows the use of weaker DC pull-up currents while meeting rise time requirements
Precharge Circuitry SDAn and SCLn pins precharged to 1 V during insertion to minimize current required
Undervoltage Lockout Disabled until both VCC and VCC2 are above 2.5 V

Key Features

  • Bidirectional buffer for SDA and SCL lines to increase fan-out and prevent corruption during live board insertion and removal.
  • Compatible with I2C-bus Standard mode, I2C-bus Fast mode, and SMBus standards.
  • Level shifting between 3.3 V and 5 V systems with dedicated supply voltage pins.
  • Rise time accelerator circuitry to meet rise time requirements with weaker DC pull-up currents.
  • Digital input pin (ACC) to enable or disable rise time accelerators.
  • Precharge circuitry to minimize current required during insertion by precharging SDAn and SCLn pins to 1 V.

Applications

  • Multipoint backplane systems where hot swappable I/O cards are used.
  • Systems requiring level shifting between different voltage levels (3.3 V and 5 V).
  • Applications needing bidirectional buffering to prevent data and clock bus corruption.
  • Industrial and automotive systems where reliable and robust I2C/SMBus communication is crucial.

Q & A

  1. What is the primary function of the PCA9512AD,112?

    The PCA9512AD,112 is a hot swappable I2C-bus and SMBus buffer that allows I/O card insertion into a live backplane without corrupting the data and clock buses.

  2. What are the supported operating modes of the PCA9512AD,112?

    The component supports I2C-bus Standard mode, I2C-bus Fast mode, and SMBus standards.

  3. What is the supply voltage range for the PCA9512AD,112?

    The supply voltage range is from 2.7 V to 5.5 V.

  4. How does the PCA9512AD,112 handle level shifting between different voltage systems?

    The component includes dedicated supply voltage pins to provide level shifting between 3.3 V and 5 V systems while maintaining the best noise margin for each voltage level.

  5. What is the purpose of the rise time accelerator circuitry in the PCA9512AD,112?

    The rise time accelerator circuitry allows the use of weaker DC pull-up currents while still meeting the rise time requirements.

  6. How does the PCA9512AD,112 minimize current during I/O card insertion?

    The SDAn and SCLn pins are precharged to 1 V during insertion to minimize the current required to charge the parasitic capacitance of the chip.

  7. What happens if either VCC or VCC2 drops below 2.0 V in the PCA9512AD,112?

    If either VCC or VCC2 drops below 2.0 V, the component returns to the undervoltage lockout state, disabling the connection circuitry, rise time accelerators, and precharge circuitry.

  8. What is the role of the ACC pin in the PCA9512AD,112?

    The ACC pin is a CMOS threshold digital input that enables or disables the rise time accelerators on all four SDAn and SCLn pins.

  9. In what types of systems is the PCA9512AD,112 typically used?

    The component is typically used in multipoint backplane systems, industrial systems, and automotive systems where hot swappable I/O cards and reliable I2C/SMBus communication are necessary.

  10. How does the PCA9512AD,112 prevent bus contention during card insertion?

    The component prevents the backplane from being connected to the card until a stop bit or bus idle occurs on the backplane, thus avoiding bus contention on the card.

Product Attributes

Type:Buffer, Accelerator
Applications:I²C - Hotswap
Input:2-Wire Bus
Output:2-Wire Bus
Data Rate (Max):400kHz
Number of Channels:1
Delay Time:- 
Signal Conditioning:- 
Capacitance - Input:10 pF
Voltage - Supply:2.7V ~ 5.5V
Current - Supply:1.8mA
Operating Temperature:-40°C ~ 85°C
Mounting Type:Surface Mount
Package / Case:8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:8-SO
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Similar Products

Part Number PCA9512AD,112 PCA9512AD,118 PCA9516AD,112 PCA9515AD,112 PCA9513AD,112 PCA9514AD,112 PCA9512D,112 PCA9517AD,112 PCA9510AD,112 PCA9511AD,112
Manufacturer NXP USA Inc. NXP USA Inc. NXP USA Inc. NXP USA Inc. NXP USA Inc. NXP USA Inc. NXP USA Inc. NXP USA Inc. NXP USA Inc. NXP USA Inc.
Product Status Obsolete Active Obsolete Obsolete Obsolete Obsolete Obsolete Obsolete Obsolete Obsolete
Type Buffer, Accelerator Buffer, Accelerator Buffer, ReDriver Buffer, ReDriver Buffer, Accelerator Buffer, Accelerator Buffer, Accelerator Buffer, ReDriver Buffer, ReDriver Buffer, Accelerator
Applications I²C - Hotswap I²C - Hotswap I²C I²C I²C - Hotswap I²C - Hotswap I²C - Hotswap I²C I²C - Hotswap I²C - Hotswap
Input 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus
Output 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus 2-Wire Bus
Data Rate (Max) 400kHz 400kHz 400kHz 400kHz 400kHz 400kHz 400kHz 400kHz 400kHz 400kHz
Number of Channels 1 1 5 1 1 1 1 2 1 1
Delay Time - - - - - - - - - -
Signal Conditioning - - - - - - - - - -
Capacitance - Input 10 pF 10 pF 6 pF 6 pF 1.9 pF 1.9 pF 10 pF 6 pF 1.9 pF 5 pF
Voltage - Supply 2.7V ~ 5.5V 2.7V ~ 5.5V 3V ~ 3.6V 2.3V ~ 3.6V 2.7V ~ 5.5V 2.7V ~ 5.5V 2.7V ~ 5.5V 2.7V ~ 5.5V 2.7V ~ 5.5V 2.7V ~ 5.5V
Current - Supply 1.8mA 1.8mA 5mA 800µA 3.5mA 3.5mA 1.8mA 5mA 6mA 6mA
Operating Temperature -40°C ~ 85°C -40°C ~ 85°C -40°C ~ 85°C -40°C ~ 85°C -40°C ~ 85°C -40°C ~ 85°C -40°C ~ 85°C -40°C ~ 85°C -40°C ~ 85°C -40°C ~ 85°C
Mounting Type Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 16-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width)
Supplier Device Package 8-SO 8-SO 16-SO 8-SO 8-SO 8-SO 8-SO 8-SO 8-SO 8-SO

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