l4993 STMicroelectronics, l4993 Datasheet - Page 9

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

L4993
Table 5.
1. See
2. Guaranteed by design
3. When Vo becomes lower than 4V, the reset reaction time decreases down to 2µs assuring a faster reset
Watchdog
Watchdog Enable
WEn
WEn
WEn
WEn
Vcw
Vcw
Vcw
Vcw
Vcw
Res
Res
Res
Pin
Vcr
Vcr
Vcr
Vcr
condition in this particular case.
Wi
Wi
Wi
Wi
Figure 3
Vih_hyst
Symbol
V
Vwhth
I_leak
V
Vrhth
Vwlth
Trr_2
Twop
V
Electrical characteristics (continued)
Vrlth
Icwd
Icwc
twol
En_hy
Trd
Vih
Icr
Idr
Vil
En_h
En_l
Ii
Reset timing high threshold Vs =13.5V
Discharge current
Low threshold
Charge current
Watchdog period
Reset timing low threshold
Charge current
Reset reaction time
Reset delay time
Input high voltage
Input low voltage
Input hysteresis
Pull down current
High threshold
Discharge current
Watchdog output low time
Enable input low voltage
Enable input high voltage
Enable input hysteresis
Pull down current
Parameter
(3)
Vs = 13.5V
Vs = 13.5V
Vs = 13.5V
Vo = V
Vs = 13.5V,
Ctr = 1nF
Vs = 13.5V
Vs = 13.5V
Vs = 13.5V
Vs = 13.5V
Vs = 13.5V
Vs = 13.5V
Vs = 13.5V,
Vcw = 0.1V
Vs = 13.5V,
Vcw = 2.5V
Vs = 13.5V,
Ctw = 47nF
Vs = 13.5V,
Ctw = 47nF
WEn = 5V
Test condition
o_th
-100mV
Electrical specifications
44%
10%
2.20
0.50
min
100
500
3.5
1.0
65
25
8
8
4
6
3
2
13%
47%
17.6
17.6
2.35
0.65
2.13
10.5
275
500
800
typ
10
50
8
8
1000
1100
max
16% V
50%
2.50
0.80
150
1.5
4.5
30
30
20
14
90
22
20
1
V
Unit
mV
mV
ms
µA
µA
ms
ms
µA
µA
µA
µA
o_ref
o_re
µs
9/23
V
V
V
V
V
V
f