PT7M1818/1813
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Supervisory Circuit
Features Description
The series are designed to monitor power supplies in P
Highly accurate: 1.5% (25C)
and digital systems. It provides excellent circuit
Accurate power monitoring: 2.5V, 2.9V, 3.0V
reliability and low cost by eliminating external
(PT7M1818), and 4.1, 4.3, 4.6V (PT7M1813)
components and adjustments.
Operating voltage range: 1.0V ~ 5.5V
This device performs a single function: it asserts a reset
Operating temperature range: -40C to + 85C
signal whenever the V supply voltage falls below a
CC
Detect voltage temperature characteristics: 2.5%
preset threshold. Reset remains asserted for 200ms after
TYP
V has risen above the reset threshold.
CC
Efficient open-drain output with internal 5k pull-up
PT7M1818/1813 are bidirectional output, allowing it to
resistor
be directly connected to P with bidirectional reset
Maintains reset for 200ms after V returns to an in-
CC
inputs.
tolerance condition
Pin Configuration
PT7M1818/1813
1
RST
GND 3
2 VCC
SOT23-3
Pin Description
Name Type Description
Reset Output and Pushbutton Input: RST is asserted when V drops below voltage threshold
CC
V . Active low. When other devices pull RST low, the reset condition occurs and will remain a
I/O TH-
RST
reset timeout period after the external signal is off.
GND P Ground
V P Supply Voltage.
CC
2014-08-0010 PT0190-7 09/11/14
1
PT7M1818/1813
Supervisory Circuit
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Maximum Ratings
Note:
Stresses greater than those listed under MAXIMUM
o o
Storage Temperature ............................................................-65 C to +150 C
RATINGS may cause permanent damage to the
o o
Ambient Temperature with Power Applied.......................... -40 C to +85 C
device. This is a stress rating only and functional
Supply Voltage to Ground Potential (Vcc to GND) ..............-0.3V to +7.0V
operation of the device at these or any other
DC Input Voltage (All inputs except Vcc and GND)......-0.3V to V +0.3V
CC conditions above those indicated in the operational
DC Output Current (All outputs) ..........................................................30mA
sections of this specification is not implied. Exposure
Power Dissipation .......................................... 320mW (Depend on package)
to absolute maximum rating conditions for extended
periods may affect reliability.
DC Electrical Characteristics
(T = -40~85C, unless otherwise noted. Typical values are at T = +25C)
A A
Description Sym. Test Conditions Min Typ Max Unit
Supply Voltage V 1.0 - 5.5 V
CC
V = 5.5V. No load. - - 12 A
CC
Supply Current I
CC
V = 3.6V. No load. - - 10 A
CC
(V ) (V )
TH- TH-
+25 C V V
TH-
0.985 1.015
Voltage Threshold V
TH-
(V ) (V )
TH- TH-
V V
-40 C~85 C
TH-
0.975 1.025
*
Hysteresis V V - V - 50 - mV
HYS TH+ TH-
I = 8mA, V = 5V - - 0.4
OH CC
Output
Output low V I = 4mA, V = 3V - - 0.3 V
OL OH CC
Driving
I = -50A, V = 1V - - 0.09
OH CC
Internal pull-up resistor Rp 3.75 5 6.25
k
RST
Note: V is voltage threshold when V falls from high to low. V is voltage threshold when V rises from low to high.
TH- CC TH+ CC
2014-08-0010 PT0190-7 09/11/14
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