SELl is a selection pin to set the LM3647 in different charge behavior. The pin has three states: tied to Vcc, GND, or un- connected (Hi-Z). When the charger is configured to charge Ni-Cd or Ni-MH batteries, this pin determines if the charger discharges the battery before charging or if the charger shall only maintenance charge the battery. When the charger is configured for Li-Ion batteries, this pin determines how the charger behaves during maintenance charge.
QPHFZ64B1Z on stock| Symbol | Parameter | Value | Unit |
| Vcc | Supply Voltage | 4.5 t0 5.5 | v |
| VI | Input Voltage | 0 to Vcc | V |
| Vo | Output Voltage | 0 to Vcc | V |
| Top | Operating Temperature: M54HC Series M74HC Series | -55 to +125 -40 to +85 | oC oC |
| trtf | Input Rise and Fall Time (Vcc = 4.5 t0 5.5V) | O t0 500 | ns |
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| Part number | 123NQ080 | 123NQ090 | 123NQ100 |
| VR Max. DC Reverse Voltage (V) | | | |
| VRWM Max. Working Peak Reverse Voltage (V) | 80 | 90 | 100 |
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