Overview
The M48T86MH1E is a real-time clock (RTC) module produced by STMicroelectronics. This component is designed to provide a complete time-keeping subsystem, including a non-volatile time-of-day clock, alarm interrupts, and 128 bytes of non-volatile static RAM. The M48T86MH1E is available in both 24-pin DIP CAPHAT and 28-pin SOIC packages, each with a self-contained battery and crystal, ensuring long-term data retention and clock operation even in the absence of power.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Supply Voltage | Operating voltage range | 4.5 V to 5.5 V |
| Operating Temperature | Range of operating temperatures | 0°C to 70°C |
| Memory Size | Size of the non-volatile RAM | 128 bytes (1 Kbit) |
| Time Format | Format of the time data | HH:MM:SS (Binary) |
| Date Format | Format of the date data | DW:DM:M:Y (Binary) |
| Bus Interface | Type of bus interface | Multiplexed (Intel/Motorola) |
| Package/Case | Available package types | 24-pin DIP CAPHAT, 28-pin SOIC |
| Lead Free Status / RoHS Status | Compliance with environmental standards | Lead free / RoHS Compliant |
| Clock Accuracy | Accuracy of the clock | Better than ±1 minute per month |
Key Features
- Drop-in Replacement: Compatible with PC computer clock/calendar.
- Time Keeping: Counts seconds, minutes, hours, days, day of the week, date, month, and year with leap year compensation.
- Interrupts: Three separately software-maskable and testable interrupts: time-of-day alarm, periodic rates, and end-of-clock update cycle.
- Programmable Square Wave Output: Output frequency can be programmed from one of 13 taps.
- Data Retention: 10 years of data retention and clock operation in the absence of power.
- Self-Contained Battery and Crystal: Available in CAPHAT™ DIP and SNAPHAT® SOIC packages.
- Bus Compatibility: Selectable bus timing (Intel/Motorola).
- RAM Clear Function: Ability to clear all 114 storage bytes of the RAM array.
Applications
The M48T86MH1E is suitable for a variety of applications requiring accurate time-keeping and alarm functions, such as:
- Personal computers and laptops.
- Embedded systems and IoT devices.
- Industrial control systems.
- Medical devices and equipment.
- Automotive systems.
Q & A
- What is the operating voltage range of the M48T86MH1E?
The operating voltage range is 4.5 V to 5.5 V.
- What is the accuracy of the clock in the M48T86MH1E?
The clock accuracy is better than ±1 minute per month.
- What types of packages are available for the M48T86MH1E?
The component is available in 24-pin DIP CAPHAT and 28-pin SOIC packages.
- Does the M48T86MH1E support multiple bus timings?
Yes, it supports both Intel and Motorola bus timings.
- How long does the battery last in the absence of power?
The battery provides 10 years of data retention and clock operation in the absence of power.
- Can the square wave output frequency be programmed?
Yes, the frequency can be programmed from one of 13 taps.
- What is the purpose of the RCL pin?
The RCL pin is used to clear all 114 storage bytes of the RAM array.
- Is the M48T86MH1E RoHS compliant?
Yes, it is lead-free and RoHS compliant.
- How many bytes of non-volatile RAM does the M48T86MH1E have?
The component has 128 bytes of non-volatile static RAM.
- What types of interrupts does the M48T86MH1E support?
It supports time-of-day alarm, periodic rates, and end-of-clock update cycle interrupts.
