This dual bidirectional I2C and SMBus voltage-level
translator, with an enable (EN) input, is operational from
1.2V to 3.3V VREF1 and 1.8V to 5.5V VREF2.
The SGM4551 allows bidirectional voltage translation
between 1.2V and 5V, without the use of a direction pin.
The low ON-state resistance (RON) of the switch allows
connections to be made with minimal propagation delay.
When EN is high, the translator switch is on, and the
SCL1 and SDA1 I/Os are connected to the SCL2 and
SDA2 I/Os, respectively, allowing bidirectional data flow
between ports. When EN is low, the translator switch is
off, and a high-impedance state exists between ports.
In I2C applications, the bus capacitance limit of 400pF
restricts the number of devices and bus length. Using the
SGM4551 enables the system designer to isolate two
halves of a bus; thus, more I2C devices or longer trace
length can be accommodated. SGM4551YN8G/TR资料下载
