Analysis of LPTTL, its capabilities and deficiencies when used by itself or in interface with LPDTL
K. D. Andreasen · USRA Houston Repository (Lunar and Planetary Institute) · 1970
The purpose of this memo is to investigate the interface conditions arising from the use of low power transistor-transistor logic (LPTTL) in conjunction with low power diode-transistor logic (LPDTL) and to familiarize the reader with the fundamental characteristics which make transistor-transistor logic (TTL) of any power level unique, demonstrating the inherent performance characteristic limits of low power transistor-transistor logic if applied in conventional logic design.