SM72240 Datasheet, PDF (2/15 Pages) Texas Instruments – SM72240 SolarMagic 5-Pin Microprocessor Reset Circuit

SM72240
SNIS154C – JANUARY 2011 – REVISED APRIL 2013
Connection Diagram
GND 1
5 VCC
GND 2 SM72240
RESET 3
4 MR
Figure 1. 5-Pin SOT-23 Package
See Package Number DBV
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Pin
Name
1
GND
2
GND
3
RESET
4
MR
5
V_CC
Block Diagram
VCC
PIN DESCRIPTIONS
Function
Ground reference
Ground reference, device substrate, connect to ground.
Active-low output. RESET remains low while V_CC is below the reset threshold voltage, and for 190
ms after V_CC rises above the reset threshold voltage.
Active-low input. Reset is asserted whenever this pin is pulled low and remains asserted for 190 ms
after the MR pin goes high. May be left open.
Supply Voltage (+5V, nominal)
Figure 2. SM72240 Block Diagram
Reset Comparator
22k
+
Reset Logic
-
and One-Shot
Low Line
Timer
Comparator
RESET
Manual Reset
Comparator
MR
+
-
1.225V
Reference
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2
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