74LS399 Overview
The SN54 / 74LS398 and SN54 / 74LS399 are high-speed Quad 2-Port Registers. They select four bits of data from two sources (Ports) under the control of a mon Select Input (S). The selected data is transferred to a 4-Bit Output Register synchronous with the LOW-to-HIGH transition of the Clock in- put (CP).
74LS399 Key Features
- Select From Two Data Sources
- Fully Positive Edge-Triggered Operation
- Both True and plemented Outputs on SN54 / 74LS398
- Input Clamp Diodes Limit High-Speed Termination Effects
- I0d I1a
- I0d Qa
- SN54/74LS399
- SN54 / 74LS398 only
- QA S QB R
- QB S QC R
