Datasheet

Block diagram and pins description L4993
6/32 Doc ID 13517 Rev 8
Figure 2. Pins configuration
Table 2. Pins description
Pin
name
SO-8 (D) SO-20 (MD) Function
WEn 1 1
Watchdog Enable input
If high watchdog functionality is active
Gnd 2 4 Ground reference
Gnd 5, 6, 15, 16
Ground
Connected these pins to a heat spreader ground
Res 3 7
Reset output.
It is pulled down when output voltage goes below Vo_th
or frequency at Wi is too low.
Leave floating if not used.
Vcr 4 10
Reset timing adjust.
A capacitor between Vcr pin and gnd, sets the reset
delay time (trd)
Vcw 5 11
Watchdog timer adjust
A capacitor between Vcw pin and gnd, sets the time
response of the watchdog monitor.
Wi 6 14
Watchdog input.
If the frequency at this input pin is too low, the Reset
output is activated.
Connect to ground if not used
Vo
s
717
Voltage regulator output
Block to ground with a capacitor >100nF (needed for
regulator stability)
Vs 8 20
Supply voltage
Block to ground directly at IC pin with a capacitor
N.C.
2, 3, 8, 9, 12,
13, 18, 19
Not connected
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