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MAX1645/MAX1645A Advanced Chemistry-Independent, Level 2 Battery Chargers with Input Current Limiting General Description
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... ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VDD = +3.3V, VBATT = +16.8V, VDCIN = +18V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER ...
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... Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. Transmitter (Driver) Outputs. These are RS-232 signal levels (typically ±9 V). Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 kΩ pull-down resistor to GND is connected on each input. Receiver Outputs. These a ...
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Wilson current mirror



A Wilson current mirror is a three-terminal circuit (Fig. 1) that accepts an input current at the input terminal and provides a ""mirrored"" current source or sink output at the output terminal. The mirrored current is a precise copy of the input current. It may be used as a Wilson current source by applying a constant bias current to the input branch as in Fig. 2. The circuit is named after George R. Wilson, an integrated circuit design engineer who worked for Tektronix. Wilson devised this configuration in 1967 when he and Barrie Gilbert challenged each other to find an improved current mirror overnight that would use only three transistors. Wilson won the challenge.
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