4/5 Bit Multiplexed/ 1 Bit Latched Port with Standard 2-Wire Bus Interface and Non-Volatile Latches
FM3540/60 4/5 Bit Multiplexed, 1 Bit Latched Port with Standard 2-Wire Bus Interface and Non-Volatile Latches
October 2...
Description
FM3540/60 4/5 Bit Multiplexed, 1 Bit Latched Port with Standard 2-Wire Bus Interface and Non-Volatile Latches
October 2001
FM3540/60 4/5 Bit Multiplexed, 1 Bit Latched Port with Standard 2-Wire Bus Interface and Non-Volatile Latches
General Description
The FM3540/60 multiplexes the I-port input signals with two internal non-volatile registers that can be loaded through the serial port. The multiplexer is selected via the serial port and defaults to the I-Port upon power-up. Pull-up resistors are provided on the input port to accommodate connections to open drain outputs and to eliminate the need for external resistors. The device supports a choice of either 2.5V output or Open Drain Outputs for easy interface to devices with different VDD Levels. The serial port is an IIC compatible slave only interface and supports both 100kbits and 400kbits modes of operation. The port is used to read the I-Port, Write Data to the internal non-volatile registers and select whether the I-Port or one of the internal nonvolatile registers is output to the Y-port. The FM3540/60 is fabricated with an advanced CMOS technology to achieve high density and low power.
Features
I Extended Operating Voltage Range 3.0V-5.5V I IIC Compatible Slave Interface. I ESD performance: Human body model > 2000V I Choice of 2.5V outputs or Open-Drain Outputs
Block Diagram
Non_Mux_Out
I[4:0]
Y[4:0] Mux1 SOPRA Mux2 SOPRB
MXSB, MXSA
IIC Read Logic
Mux3 Control Logic
MUXSEL OVRD
SDA SCL
IIC Interface
Shift ...
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