MAX16059ATT21+T Maxim Integrated Products, MAX16059ATT21+T Datasheet - Page 9

• Manufacturer Part Number: MAX16059ATT21+T
• Description: IC SUPERVISOR OD 2.1V 6-TDFN
• Manufacturer: Maxim Integrated Products
• Type: Simple Reset/Power-On Resetr

Specifications of MAX16059ATT21+T

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: 2.1V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 6-TDFN Exposed Pad
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The reset timeout period is adjustable to accommodate
a variety of µP applications. To adjust the reset timeout
period (t
and ground. The reset timeout capacitor is calculated
as follows:
with t
C
ceramic capacitor with low temperature coefficient
dielectric (i.e., X7R) is recommended.
The watchdog timeout period is adjustable to accom-
modate a variety of µP applications. With this feature,
the watchdog timeout can be optimized for software
execution. The programmer can determine how often
the watchdog timer should be serviced. Adjust the
watchdog timeout period (t
tor (C
operation, calculate the watchdog timeout as follows:
with t
(Floor: take the integral value) (Figures 2 and 3)
The maximum t
greater than the 296s, t
timer is disabled.
C
A ceramic capacitor with low temperature coefficient
dielectric (i.e., X7R) is recommended.
The watchdog timeout period is affected by the SWT
ramp current (I
old (V
(t
10
watchdog timeout clock period. Calculate the timeout
t
WD
WDPER
SRT
SWT
6
is equal to V
= Floor[C
Selecting Watchdog Timeout Capacitor
Selecting the Reset Timeout Capacitor
RP
WD
must be a low-leakage (< 10nA) type capacitor. A
SWT
RAMP2
must be a low-leakage (< 10nA) type capacitor.
in seconds and C
). In the equation above, the constant 5.15 x
RP
in seconds and C
) between SWT and GND. For normal mode
), connect a capacitor (C
125nA Supervisory Circuits with Capacitor-
) and the watchdog timeout clock period
SWT
Adjustable Reset and Watchdog Timeouts
RAMP2
Applications Information
C
WD
RAMP2
SRT
_______________________________________________________________________________________
Watchdog Timeout Accuracy
x 5.15 x 10
is 296s. If the capacitor sets t
) accuracy, the SWT ramp thresh-
= t
WD
/I
RP
RAMP2
SRT
SWT
WD
/(5.15 x 10
= infinite and the watchdog
6
) by connecting a capaci-
in Farads.
/6.4ms] x 6.4ms + 3.2ms
in Farads.
, and 6.4ms equals the
SRT
6
)
) between SRT
WD
accuracy by substituting the minimum, typical, and
maximum values into the equation.
For example, if C
t
3.5ms + 0.5 x 3.2ms = 141.7ms
t
x 6.4ms + 0.5 x 6.4ms = 515.2ms
t
x 9.5ms + 0.5 x 9.5ms = 1790.75ms
For applications with higher slew rates on V
power-up, additional bypass capacitance may be
required.
The MAX16056–MAX16059 are relatively immune to
short-duration supply voltage transients, or glitches on
V
Threshold Overdrive graph in the Typical Operating
Characteristics shows this transient immunity. The area
below the curve of the graph is the region where these
devices typically do not generate a reset pulse. This
graph was generated using a falling pulse applied to
V
(V
overdrive). As the magnitude of the transient increases,
the maximum allowable pulse width decreases.
Typically, a 100mV V
less does not cause a reset.
Using the RESET output to control an external p-channel
MOSFET to control the on-time of a power supply can
result in lower system power consumption in systems that
can be regularly put to sleep. By tying the WDI input to
ground, the RESET output becomes a low-frequency
clock output. When RESET is low, the MOSFET is turned
on and power is applied to the system. When RESET is
high, the MOSFET is turned off and no power is con-
sumed by the system. This effectively reduces the shut-
down current of the system to zero (Figure 4).
WDMIN
WDNOM
WDMAX
CC
CC
TH
. The Maximum V
, starting 100mV above the actual reset threshold
) and ending below this threshold (reset threshold
Reducing System Power Consumption
= Floor[100 x 10
= Floor[100 x 10
= Floor[100 x 10
Using the MAX16056–MAX16059 for
SWT
= 100nF.
CC
CC
-9
-9
-9
transient duration of 40µs or
Transient Duration vs. Reset
x 1.173/(282 x 10
x 1.297/(197 x 10
x 1.235/(240 x 10
Transient Immunity
-9
CC
)/9.5ms] x
-9
-9
)/6.4ms]
)/3.5ms]
during
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