MAX6304ESA Maxim Integrated Products, MAX6304ESA Datasheet - Page 7

• Manufacturer Part Number: MAX6304ESA
• Description: IC CIRCUIT SUPERVISORY LP 8-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Simple Reset/Power-On Resetr

Specifications of MAX6304ESA

• Number Of Voltages Monitored: 1
• Output: Push-Pull, Totem Pole
• Reset: Active High
• Reset Timeout: 2.8 ms Minimum
• Voltage - Threshold: Adjustable/Selectable
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 2a. Watchdog Timing Diagram, WDS = GND
Figure 2b. Watchdog Timing Diagram, WDS = V
watchdog counter. When WDI is left unconnected, the
watchdog timer is cleared by this internal driver just
before the timeout period is reached (the internal driver
pulls WDI high at about 94% of t
three-stated, the maximum allowable leakage current of
the device driving WDI is 10µA.
In normal mode (WDS = GND), the watchdog timer
cannot be disabled by three-stating WDI. WDI is a
high-impedance input in this mode. Do not leave WDI
unconnected in normal mode.
The reset timeout period is adjustable to accommodate
a variety of µP applications. Adjust the reset timeout
period (t
(C
the reset timeout capacitor as follows:
SRT
NORMAL MODE (WDS = GND)
EXTENDED MODE (WDS = V
) between SRT and ground (Figure 3). Calculate
RESET
RESET
WDI
WDI
RP
Selecting the Reset and Watchdog
V
V
V
V
) by connecting a specific value capacitor
0V
0V
CC
0V
CC
0V
CC
CC
Applications Information
_______________________________________________________________________________________
+5V, Low-Power µP Supervisory Circuits
C
CC
SRT
)
= t
RP
/2.67
Timeout Capacitor
WD
with Adjustable Reset/Watchdog
). When WDI is
CC
t
WD
t
WD
x 500
Figure 3. Calculating the Reset (C
Timeout Capacitor Values
C
SRT
C
SRT
C
t
RP
SRT
= t
in µs
2.67
in pF
RP
C
SWT
t
RP
C
C
t
WD
GND
SRT
SWT
SWT
SWT
in µs
= t
in pF
MAX6301
MAX6302
MAX6303
MAX6304
2.67
WD
SRT
) and Watchdog (C
V
CC
V
CC
0.1µF
t
RP
SWT
)
7