Dual Flip-Flop S202

This document is a technical schematic diagram for a Digital Equipment Corporation (DEC) Dual Flip-Flop module (model S202). The schematic details the circuitry of the flip-flop, including:

• Components: The circuit utilizes DEC 3639C transistors, 15,000-ohm resistors, D-664 diodes, and various capacitors.
• Structure: It illustrates two symmetric flip-flop stages, each utilizing cross-coupled transistors (Q1/Q2 and Q3/Q4) to maintain binary states.
• Power/Input/Output: The circuit interfaces with power rails (+10V and -15V) and features multiple labeled inputs and outputs (labeled D, E, F, H, J, K, L, M, N, O, P, R, S, T, U, V).
• Documentation Details: The sheet includes a conversion chart for transistor and diode types (listing cross-references for DEC to EIA parts), design/revision history, and notes on component specifications.