MOTOROLA MC33187 User Guide and Manual
Summary
The MC33187 is a robust, long-duration automotive timer chip built for precise timing control in critical applications, such as defogger systems, utilizing advanced digital divider technology. This comprehensive guide serves as the technical manual, detailing its operation within an 8-pin package and covering thorough specifications, electrical ratings, pin connections, and application guidelines. It is perfect for engineers developing reliable automotive electronics who require a component capable of delivering stable timing intervals across extreme temperature ranges (–40°C to 85°C) at voltages from 5V to 18V.
Page 1 Text Content
Order Number: MC33187/D
MOTOROLA SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:0755-83376549 FAX:0755-83376182 E-MAIL:[email protected] Rev. 4, 06/2001 Semiconductor Technical Data
MC33187
Advance Information
Long Duration Automotive Timer LONG DURATION AUTO- MOTIVE TIMER
This circuit is a Long Duration Automotive Timer primarily designed
SEMICONDUCTOR
as a deffoger timer, but as it is realised using a digital divider TECHNICAL DATA techniques and it is suitable for a variety of long duration timing functions. The circuit is available in an 8 pin surface plastic package.
• Operating Ambient Temperature from -40°C to 85°C
D SUFFIX PLASTIC PACKAGE
• Operating Voltage Range from 5V to 18V
CASE 751 (SO-8)
• 400m A Output Current Capability • Integrated Input Debounce Circuitry
PIN CONNECTIONS
• Few External Components • Toggle Input for Timing Start and Stop
RC TS
Gnd N/C
Relay N/C
Toggle Vcc3
ORDERING INFORMATION
Operating
Device Package
Temperature Range
MC33187D SO8-40°C to +85°C
Block Diagram and Typical Application
6.8 Hz
Dz Relay
Debounce Timer
Toggle Timing
This document contains information on a new product. Specifications and information herein are subject to change without notice.
SUNSTAR自动化 http://www.sensor-ic.com/ TEL: 0755-83376489 FAX:0755-83376182 E-MAIL:[email protected] TM
© Motorola, Inc., 2001. All rights reserved.
Page Summary Contents For MOTOROLA MC33187 User Guide and Manual
Manual Details
| Brand | Motorola |
|---|---|
| Pages | 8 |
| File Size | 257.11 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What is the acceptable operating voltage range for this timer?
The circuit operates over a supply voltage range of 5V to 18V; an internal 7V zener limits the Vcc terminal voltage.
What are the recommended external values for accurate timing?
For a standard 12V vehicle system, the recommended values are Rs = 1KOhm and Cs = 100nF for accurate oscillation period setting.
Which pins manage the timer's ON/OFF state?
Pin 4 is the TOGGLE pin (toggle input), while Pin 1 controls the oscillator frequency, which dictates the cycle timing.
What is the maximum current capability of the relay output?
The relay driver features an open collector output capable of 400mA and can operate up to a Vmax of 18V.