This document describes the features and characteristics of the M48T37Y and M48T37V models, including integrated ultra-low power SRAM, real-time clock, power-fail control circuit, and battery. It also includes a frequency test output for software calibration, year 2000 compliance, automatic power-fail chip deselect and write protection, watchdog timer, write protect voltage, packaging options, microprocessor power-on reset, programmable alarm output in battery back-up mode, battery low flag, and RoHS compliance.
The M48T37Y/V TIMEKEEPER® SRAM combines a 256‑Kbit (32 Kbit × 8) ultra‑low‑power static RAM with a real‑time clock, power‑fail control circuit, and battery backup. It includes features such as a watchdog timer, programmable alarm output, and year‑2000 compliance.
The device is supplied in a 44‑lead SOIC (SOH44) package with an optional SNAPHAT top that houses the battery and crystal. It operates from either a 5.0 V or 3.3 V supply, with specific write‑protect voltage ranges for each variant, and complies with RoHS lead‑free requirements.
| Memory capacity | 256 Kbit (32 Kbit × 8) |
|---|---|
| Operating voltage (M48T37Y) | 4.5 V to 5.5 V |
| Operating voltage (M48T37V) | 3.0 V to 3.6 V |
| RoHS compliance | Lead‑free components |
| Watchdog timer | Integrated |
| Battery‑low flag | Integrated |
| Year‑2000 compliant | Yes |
The M48T37Y operates from 4.5 V to 5.5 V.
The M48T37V operates from 3.0 V to 3.6 V.
Yes, it uses lead‑free components that meet RoHS requirements.