STMicroelectronics has introduced a pair of analog multiplexer/demultiplexers optimised for use in automotive and industrial applications. The M74HC4851 is a single eight-channel analog mux/demux and the M74HC4852 is a dual four-channel analog mux/demux.
Both parts feature injection current protection, which makes them suitable for use where voltages in excess of normal logic levels are common. The injection current effect control allows signals at disabled inputs to exceed the supply voltage range or fall to ground without affecting the signal on the enabled analog channel. This eliminates the need for the external diode-resistor networks typically used to keep the analog channel signals within the supply voltage range.
The M74HC4851 analog switch has three binary control inputs to select one of eight channels to be connected to the output, and an inhibit input to disable all channels. All the inputs and outputs are protected against static discharge of up to 2 kV.
Both parts feature injection current cross-coupling of less than 1 mV/1 mA. The operating supply voltage can be between 2 and 6 V and power dissipation is low, at 2 µA at 25°C. On resistance at 25°C is 215 Ω with a 3 V supply, 150 Ω with a 4,5 V supply and 160 Ω with a supply of 6 V. Switching time tpd is 8,6 ns at 25°C with a supply voltage of 4,5 V.
Both parts are available in SO-16 and TSSOP16 packages.
For more information contact Simon Churches, Arrow Altech Distribution, 011 923 9600, [email protected]
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