US PATENT SUBCLASS 326 / 128
.~.~ Transistor-transistor logic (TTL)

Current as of: June, 1999
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326 /   HD   ELECTRONIC DIGITAL LOGIC CIRCUITRY

104  DF  FUNCTION OF AND, OR, NAND, NOR, or NOT {7}
124  DF  .~ Bipolar transistor (e.g., RTL, DCTL, etc.) {5}
128.~.~ Transistor-transistor logic (TTL) {1}
129  DF  .~.~.~> Complementary transistor logic (CTL)

DEFINITION

Classification: 326/128

Transistor-transistor logic (TTL):

(under subclass 124) Subject matter wherein the logic function unit includes a forward-biased input transistor which is responsive to an input logic signal at each of its one or more emitters and with its collector being directly coupled to the base of an output transistor.

(1) Note. In TTL, the base-collector junction of the input transistor (usually a multiemitter type) remains forward biased and in the saturation region when the circuit is in either the "on" or "off" condition.