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PT2313 - three-input four output digital control channel audio processor
74LS128 - LSTTL type four 2-input NOR line driver
SC2314 - Four-input sound processor IC
LMC1992 - LMC1992 Digitally-Controlled Stereo Tone and Volume Circuit with Four-Channel Input-Selector
MAX20480 - Four- to Seven-Input Automotive PowerSystem Monitor
HD74HC157 - These devices each consist of four 2-input digital multiplexers with common select and strobe inputs
66012 - FOUR CHANNEL/ HERMETICALLY SEALED/ LOW-INPUT CURRENT/ 6N140 OPTOCOUPLER
HD74HC158 - These devices each consist of four 2-input digital multiplexers with common select and strobe inputs
54LS128 - LSTTL type four 2-input NOR line driver
MAX1804 - External Four-Input Feedback Integrator for Power Supplies