Complementary Emitter-Coupled Logic to Push-Pull Driver
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
This article describes an off-chip push-pull driver circuit designed to interface with CECL (complementary emitter-coupled logic) internal circuits. The circuit shown is a CECL to push-pull driver based on the open collector driver concept. As shown, the unused phase (Node A) of the current switch from the open collector driver is now connected to the collector of transistor TD9 and the base of transistor TD6. TD6, in conjunction with transistor TD8 and a current-limiting resistor, forms a Darlington type output. TD9, in combination with resistors RD6 and RD6A, controls the output voltage level so that by adjusting RD6 and RD6A appropriately, this circuit can be used as either a VTL or a GPI driver.