If you are looking for a simple device that can store state information, look no further than Texas Instruments" SN74HC74DE4 flip flop device. It has a differential output signal. This flip flop has a minimum operating temperature of -40 °C and a maximum of 85 °C. This device comes in tube packaging. It has 2 channels per chip. This inverting/non-inverting device has a typical operating supply voltage of 5 V. Its minimum operating supply voltage of 2 V, while its maximum is 6 V.