CM2500

• Functionally equivalent to a five-diode pair network
• Up to 60% space saving vs. discrete solution
• Flexibility in design with "separate" outputs
• 100k pull-up resistors on outputs
• Voltage drop of less than 10mV under light loads
• 16-lead QFN package - 3mm x 3mm, 0.5mm pitch
• Lead-free version available

The CM2500-05 is a CMOS multiplexer for keypad switches. The device is functionally equivalent to a five-diode pair network. However, each channel in this network has virtually no voltage drop from input to output under light load. All inputs and outputs have an internal pull up to VCC.

CM2500 is particularly well suited for portable electronics (e.g. mobile handsets, PDAs, notebook computers) because of its small package format. This product is ideal for converting the logic of keypad switches where each switch pulls two sense lines low. The keypad multiplexer channels are set up in series on the keypad sense lines such that it will interface directly to the CPU chipset.

The CM2500-05 is available in a space-saving, low-profile 16-lead QFN package. This presents a 60% saving in space when compared with a discrete implementation. The CM2500-05 is available with optional lead-free finishing.