MC145026D

The MC145026D from NXP Semiconductors is a versatile CMOS encoder/decoder integrated circuit specifically designed for remote control applications. This device supports a wide operating voltage range from 2.5V to 18V, making it suitable for various power supply requirements.

The MC145026D encodes nine lines of information and can transmit this data serially upon receiving a transmit enable signal. It supports both trinary (low, high, open) and binary (low, high) data encoding. The corresponding decoder (MC145027 or MC145028) interprets the serial stream, with the MC145027 offering 243 addresses for trinary data or 32 for binary data, and the MC145028 supporting up to 19,683 trinary codes or 512 binary codes. A valid transmission (VT) output indicates successful and secure data reception.

This encoder/decoder IC interfaces with RF, ultrasonic, or infrared modulators and demodulators. It features an internal RC oscillator, eliminating the need for an external crystal, and exhibits high external component tolerance, allowing the use of ±5% components. The device is housed in a 16-SOIC package with a surface mount type, facilitating integration into compact electronic designs.

Key features include a very low standby current for the encoder (300 nA maximum at 25°C), high external component tolerance, and an internal power-on reset that forces all decoder outputs low. The operating temperature range is -40°C to +85°C.