MAX6420 MAXIM [Maxim Integrated Products], MAX6420 Datasheet - Page 7

• Manufacturer Part Number: MAX6420
• Description: Low-Power, Single/Dual-Voltage ?P Reset Circuits with Capacitor-Adjustable Reset Timeout Delay
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 4. MAX6418/MAX6419/MAX6420 Monitoring Two Voltages
monitor voltages other than V
shown in the Reset Threshold section. (See Figure 3.)
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
C
SRT
_______________________________________________________________________________________
R1
R2
V
MON_TH
RESET IN
GND
SRT
CC
1.26V
V
. Calculate V
CC
LASER-TRIMMED
RESISTORS
MAX6418
MAX6419
MAX6420
MON_TH
CIRCUITRY
RESET
as
V
CC
(RESET)
RESET
The MAX6418/MAX6419/MAX6420 contain both facto-
ry-trimmed threshold voltages and an adjustable reset
threshold input, allowing the monitoring of two voltages,
V
when either of the voltages falls below its respective
threshold voltage.
The reset timeout period is adjustable to accommodate
a variety of µP applications. Adjust the reset timeout
period (t
SRT and ground. Calculate the reset timeout capacitor
as follows:
where t
CC
and V
RP
RP
MAX6420
ONLY
is in seconds and C
C
) by connecting a capacitor (C
R
MON_TH
L
SRT
(MAX6418/MAX6419/MAX6420)
= (t
Application Information
Selecting a Reset Capacitor
RP
(see Figure 4). Reset is asserted
- 275µs) / (2.73
µP
Dual-Voltage Monitoring
SRT
is in Farads

10
SRT
6
)
) between
7