M48T86 5.0V PC Real-Time Clock is a drop-in replacement for PC computer clock/calendar, it counts seconds, minutes, hours, days, day of the week, date, month, and year with leap year compensation.
The M48T86 is an industry‑standard real‑time clock (RTC) that integrates a lithium battery, quartz crystal, write‑protection circuitry, and a 128‑byte RAM array in a single package. It is offered in a 24‑pin DIP CAPHAT package or a 28‑pin SOIC with a separate SNAPHAT battery/crystal module.
The device provides selectable Intel or Motorola bus timing, three independent interrupt sources (alarm, periodic, and update‑cycle), and a programmable square‑wave output with up to 13 frequency taps. All registers and RAM are non‑volatile, retaining data for up to ten years without power.
| Operating voltage | 5.0 V Vcc |
|---|---|
| Clock/control registers | 14 bytes |
| General‑purpose RAM | 114 bytes |
| Square‑wave output taps | 13 taps |
| Automatic deselection time after power‑up | 200 ms (max) |
| Interrupt sources | Three (Alarm, Periodic, Update‑Cycle) |
The M48T86 operates from a 5 V Vcc supply.
It provides 114 bytes of general‑purpose non‑volatile RAM.
Three interrupt sources are available: a time‑of‑day alarm, a periodic interrupt, and an end‑of‑clock update‑cycle interrupt.