M145

This document is a proprietary schematic diagram titled "SEVEN 3 INPUT NAND GATES M145" by Digital Equipment Corporation, copyrighted 1970 and drawn on December 9, 1976, primarily for test and maintenance purposes.

The schematic illustrates a circuit featuring seven 3-input NAND gates, implemented using three DECI074H10 integrated circuits. It includes a power supply section providing +5V and a regulated +3V output, supported by various decoupling capacitors and resistors.

Key component specifications noted are:

• Resistors: 1/4W, 5% (specific values include 220 Ohm and 330 Ohm).
• Capacitors: .01uF, 100V, 20% for general decoupling, and a 39uF, 10V, 10% tantalum capacitor in the +3V regulation circuit.
• ICs: DECI074H10, with Pin 7 connected to Ground and Pin 14 to +5V.

An asterisk (*) on the diagram indicates pins that are not connected. The accompanying parts list details all components, including the etched circuit board and various assembly documentation items.