S39421 View Datasheet(PDF) - Summit Microelectronics
Part Name
Description
MFG CO.
'S39421' PDF : 28 Pages View PDF
S39421
Boosting RESET Output Drive
The slew-rate of the RESET output is >30V/µs at the LO
to HI logic transition with a 50pF load and a 1.5ký pull-up
resistor. If the RESET output needs to drive a larger load
capacitance or needs to slew faster, then an external NPN
transistor or N-channel MOSFET must be added to boost
output current. The RESET output drives the external
transistor providing a current sink capability of >30mA on
the RESET output. Using the boost circuit with a 430ý
pull-up resistor and 100pF load capacitance, the slew-
rate increases to >50V/µs. See diagrams below.
S39421 - Circuits to Increase RESET Output Drive
RESET
RESET
3.9kΩ
2N3904
RESET
RESET
TN0200T
10kΩ
GND
4.7kΩ
GND
FIGURE 21. RESET CURRENT BOOST CIRCUIT
2024 ILL26.0
2024 9.0 8/8/00
18
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