This document is about MSM7512B, which is a half duplex FSK modem for ITU-T V.23. It features single power supply (+3 V to +5 V) and low power consumption (operating mode is 25 mW, standby mode is 0.1 mW).
The OKI MSM7512B is a 1200 bps half‑duplex FSK modem conforming to ITU‑T V.23, designed for low‑cost built‑in modems, telecontrol and home security systems. It operates from a single power supply of +3 V to +5 V and offers low power consumption, line hybrid circuitry, and a digital TTL interface.
The document provides a block diagram, pin configuration for DIP‑16 and SOP‑24 packages, absolute maximum ratings, recommended operating conditions, electrical characteristics (DC and AC), and operation mode tables for FSK transmit, receive, analog loop‑back and power‑down modes.
| Typical Operating Voltage | +5.5 V |
|---|---|
| Operating Temperature | -40 °C to +85 °C |
| Single Power Supply | +3 V to +5 V |
| Typical Power Consumption (Operating Mode) | 25 mW |
| Maximum Power Consumption (Power‑Down Mode) | 0.1 mW |
| Crystal Oscillator Frequency | 3.579545 MHz |
| Digital Interface | TTL |
The MSM7512B can be used from –40 °C to +85 °C.
The DIP version of the MSM7512B uses a 16‑pin plastic package.
In operating mode the chip consumes about 25 mW.