Description The UM82C451 is an enhanced version of the popular UM82C450 asynchronaus communications element (ACE). The sarial channel performs serial-to-parallel conversion on data characters received from peripheral devices or modems, and parallel-to-serial conversion of data char- acters transmitted b',t the CPU. The complete status of the Parallel/Asychronous Communlcations Element (P/ACE) can be read at an'/ time during functional operation by the CPU, The information obtained includes the type and condition of the transfer operations being performed, and error conditions. It is fully pin-and upward-compatible with the dual serial channel UM82C452. The second serial channel of the UM82C452 0ccupies pins that are VCC, GND, or NC {not connected) on the UM82C451.
RS1-56R0-J1 Price| | | | Limits | |
| Symbol | Parameter | Test conditions | Min | Typ* | Max | Unit |
| ICEO | Output leakage current | VCE0=50V | | | -100 | pA |
| | | Vi=Vs-3.2V,Io=-lOOmA | | 1.6 | 2.0 | V |
| VCE(sat) | Output saturation voltage . | Vi=Vs-3.6V,Io--350mA | | 1.8 | 2.4 |
| | | y-Vs-3.6V | | -320 | -600 | A |
| Il | Input current | vl=vs-15v | | | -3.2 | mA |
| VR | Clamp dlode reverse voltage | IR=1 00LzA | 50 | | | V |
| VF | Clamp diode forward voltage | IF= -350mA | | | -2.4 | V |
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RS1-56R0-J1 on stock| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| I - | lLJ | | | | L | | ^ | | | _ | | | | | | | | | | | | | =5 | | | | | |
| YW | | y | 1-1 | _ | I Nl' | V | | | | | | | | | | | | | | | | | | | | | | | |
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