PCA9617A Level translating Fm+ I²C-bus repeater

The PCA9617A is a CMOS integrated circuit that provides level shifting between low voltage (0.8 V to 5.5 V) and higher voltage (2.2 V to 5.5 V) Fast-mode Plus (Fm+) I²C-bus or SMBus applications. While retaining all the operating modes and features of the I²C-bus system during the level shifts, it also permits extension of the I²C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL) lines, thus enabling two buses of 540 pF at 1 MHz or up to 4000 pF at lower speeds. Using the PCA9617A enables the system designer to isolate two halves of a bus for both voltage and capacitance. The SDA and SCL pins are overvoltage tolerant and are high-impedance when the PCA9617A is unpowered.

The 2.2 V to 5.5 V bus port B drivers have the static level offset, while the adjustable voltage bus port A drivers eliminate the static offset voltage. This results in a LOW on the port B translating into a nearly 0 V LOW on the port A which accommodates the smaller voltage swings of lower voltage logic.

The static offset design of the port B PCA9617A I/O drivers prevents them from being connected to the static or incremented offset of other bus buffers. Port A of two or more PCA9617As can be connected together, however, to allow a star topography with port A on the common bus, and port A can be connected directly to any other buffer with static or incremented offset outputs. Multiple PCA9617As can be connected in series, port A to port B, with no build-up in offset voltage with only time of flight delays to consider.

The PCA9617A drivers are not enabled unless VCC(A) is above 0.8 V and VCC(B) is above 2.2 V. The EN pin is referenced to VCC(B) and can also be used to turn the drivers on and off under system control. Caution should be observed to only change the state of the enable pin when the bus is idle.

The output pull-down on the port B internal buffer LOW is set for approximately 0.55 V, while the input threshold of the internal buffer is set about 90 mV lower (0.45 V). When the port B I/O is driven LOW internally, the LOW is not recognized as a LOW by the input. This prevents a latching condition from occurring. The output pull-down on port A drives a hard LOW and the input level is set at 0.35 VCC(A) to accommodate the need for a lower LOW level in systems where the low voltage side supply voltage is as low as 0.8 V

产品特点 Features
封装
型号 可订购的器件编号 订购码 (12NC) 产品状态 封装
PCA9617ADP 9352 999 53118 PCA9617ADPJ 量产 TSSOP8 (SOT505-1)
PCA9617ATP 9352 999 54147 PCA9617ATPZ 量产 HWSON8 (SOT1069-2)
订货和供应
型号 订购码 (12NC) 可订购的器件编号 化学成分
PCA9617ADP 9352 999 53118 PCA9617ADPJ PCA9617ADP
PCA9617ATP 9352 999 54147 PCA9617ATPZ PCA9617ATP
PCA9617A 技术支持
档案名称 标题 类型 格式
PCA9617A Level translating Fm+ I2C-bus repeater Data sheet pdf
AN10441 Level shifting techniques in I2C-bus design Application note pdf
AN255 I2C / SMBus Repeaters, Hubs and Expanders Application note pdf
AN10710 Features and applications of the PCA9617A I2C-bus extender Application note pdf
75016527 Extend standard I2C-bus devices without worrying about offset voltages; NXP I2C-bus extender PCA9617A in a proven application Brochure pdf
75016532 Extend the I2C-bus with advanced repeaters and hubs; NXP 2-channel I2C-bus repeaters PCA9617Ax and 5-channel I2C-bus hubs PCA9516x Leaflet pdf
75016080 Extend the reach of any I2C-bus system without special offset voltage levels; NXP I2C-bus extender PCA9617A Leaflet pdf
75017424 NXP I2C-bus solutions 2013: Smart, simple solutions for the 12 most common design concerns Leaflet pdf
UM10204 I2C-bus specification and user manual User manual pdf
UM10206 I2C Demonstration Board 2005-1 Quick Start Guide User manual pdf
UM10323 PCA9617A demonstration board OM6293 User manual pdf