The CD40109B contains four low-to-high-voltage level-shifting circuits. Each circuit will shift a low-voltage digital-logic input signal (A, B, C, D) with logical 1 = VCC and logical 0 = VSS to a higher-voltage output signal (E, F, G, H) with logical 1 = VDD and logical 0 = VSS.

Features of CD40109 Low-To-High Voltage Level Shifter:

• Independence of power supply sequence considerations - VCC can exceed VDD, input signals can exceed both VCC and VDD.
• Up and down level-shifting capability.
• Three-state outputs with separate enable controls.
• Standardized, symmetrical output characteristics.
• 100% tested for quiescent current at 20 V.
• Maximum input current of 1 uA at 18 V over full package-temperature range; 100 nA at 18 V and 25°C.

Applications of CD40109 Low-To-High Voltage Level Shifter:

• High-or-low level-shifting with three-state outputs for unidirectional or bidirectional bussing.
• Isolation of logic subsystems using separate power supplies from supply sequencing, supply loss and supply regulation considerations.