MC145028P

Encoders, Decoders, Converters Overview

The MC145028P is a CMOS decoder integrated circuit designed for remote control applications. It operates within a supply voltage range of 4.5 V to 18 V and supports an operating temperature range from –40°C to +85°C. The device features nine address input pins (A1–A9) that allow for 19,683 unique codes using trinary data or 512 codes with binary data. It includes a Valid Transmission (VT) output that activates upon receiving two consecutive matching address sequences. The component is housed in a 16-pin Plastic Dual In-Line Package (PDIP).

Encoders, Decoders, Converters Feature Summary

• Supports up to 19,683 unique addresses via trinary encoding or 512 addresses via binary encoding.
• Features a Valid Transmission (VT) output that activates only after two consecutive matching address sequences are received.
• Includes internal power-on reset logic to force all decoder outputs low during initialization.

Encoders, Decoders, Converters Applications

• Remote control systems requiring high address capacity.
• Wired or wireless telemetry networks utilizing RF, ultrasonic, or infrared modulation.
• Security systems needing secure address verification protocols.

Encoders, Decoders, Converters Procurement Notes

Verify the specific package suffix 'P' corresponds to the Plastic DIP configuration when sourcing components. Confirm the manufacturer origin, as this part was originally produced by Motorola and is now managed under NXP USA Inc. Ensure compatibility with existing RC oscillator timing components before procurement.

Encoders, Decoders, Converters Selection Notes

Select the MC145028P when a system requires decoding nine trinary address bits without separate data output lines. This decoder pairs specifically with the MC145026 encoder. Verify that the application utilizes trinary switches or appropriate pull-up/pull-down resistors to generate the required open, high, and low states for address inputs.

Encoders, Decoders, Converters Part Context

This component belongs to the MC145026/27/28 family of CMOS encoder and decoder pairs. While the MC145026 handles encoding and the MC145027 decodes five address bits plus four data bits, the MC145028 focuses exclusively on decoding nine address bits. This family is widely used in legacy and industrial remote control interfaces.

Encoders, Decoders, Converters Replacement Considerations

The SC41344P is a low-voltage variant of the MC145028P, operating between 2.8 V and 10 V. For standard voltage applications, no direct functional substitute is listed; however, the MC145027P may be considered if fewer address bits are sufficient.

Encoders, Decoders, Converters FAQ

How does the MC145028P determine a valid transmission?

The VT output goes high only when two consecutive encoding sequences are received where both addresses match the local decoder address settings.

What is the maximum number of addresses supported by the MC145028P?

It supports 19,683 addresses when using trinary data encoding and 512 addresses when using binary data encoding.

Does the MC145028P provide data output pins?

No, the MC145028P treats all nine digits as address information and does not have dedicated data output pins like the MC145027.