l4993 STMicroelectronics, l4993 Datasheet - Page 6

• Manufacturer Part Number: l4993
• Description: Low Drop Voltage Regulator
• Manufacturer: STMicroelectronics

Block diagram and pins description
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Table 2.
Figure 2.
name
WEn
N.C.
Gnd
Gnd
Vcw
Res
Pin
Vcr
Vo
Wi
Vs
s
WEn
GND
Res
Vcr
Pins description
Pins configuration
SO8(D)
3
4
1
2
1
2
3
4
5
6
7
8
2, 3, 8, 9, 12,
5, 6, 15, 16
S020(MD)
13, 18, 19
8
7
6
5
10
11
14
17
20
1
4
7
Vs
Vos
Wi
Vcw
Watchdog Enable input
If high watchdog functionality is active
Ground reference
Ground
Connected these pins to a heat spreader ground
Reset output.
It is pulled down when output voltage goes below Vo_th
or frequency at Wi is too low.
Reset timing adjust.
A capacitor between Vcr pin and gnd, sets the reset
delay time (trd)
Watchdog timer adjust
A capacitor between Vcw pin and gnd, sets the time
response of the watchdog monitor.
Watchdog input.
If the frequency at this input pin is too low, the Reset
output is activated.
Voltage regulator output
Block to ground with a capacitor >100nF (needed for
regulator stability)
Supply voltage
Block to ground directly at IC pin with a capacitor
Not connected
GND
GND
WEn
GND
N.C.
N.C.
Res
N.C.
N.C.
Vcr
1
2
3
4
5
6
7
8
10
9
Function
16
14
15
13
19
18
17
12
11
20
GND
N.C.
Vs
N.C.
N.C.
Vos
GND
Wi
N.C.
Vcw
L4993