PT7M6315US
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Supervisory Circuit
Features
Highly accurate:
1.5%
(25°
C)
Detect voltage range: 1.8 to 5V in 100mV
increments
Operating voltage range: 1.0V ~ 5.5V
Operating temperature range: -40° to + 85°
C
C
Detect voltage temperature characteristics:
2.5%
TYP
Output configuration: N-channel open drain
Three reset timeout period available:
typical 1.6ms for PT7M6315USxxD1;
typical 26ms for PT7M6315USxxD2;
typical 200ms for PT7M6315USxxD3;
typical 1570ms for PT7M6315USxxD4;
Description
The series are designed to monitor power supplies in µ
P
and digital systems. It provides excellent circuit
reliability and low cost by eliminating external
components and adjustments, and a debounced manual
reset input.
This device performs a single function: it asserts a reset
signal whenever the V
CC
supply voltage falls below a
preset threshold or whenever manual reset is asserted.
Reset remains asserted for an internally programmed
interval (reset timeout period) after V
CC
has risen above
the reset threshold or manual reset is deasserted.
The PT7M6315USxx are open-drain RESET output.
They can be pulled up to a voltage higher than V
CC
.
The serials come with factory-trimmed reset threshold
voltages in 100mV increments from 1.8V to 5V. Preset
timeout periods of 200ms (typ.) for PT7M6315USxxD3,
1570ms (typ.) for PT7M6315USxxD4, and 26ms for
PT7M6315USxxD2 are available.
Pin Configuration
PT7M6315USxxD3F/D4F
1
GND
VCC
4
2
RST
SOT143-4
MR
3
Pin Description
Name Type
RST
MR
I/O
I
P
P
Description
Reset Output:
RST is asserted when V
CC
drops below voltage threshold V
TH-
. Active low.
Manual Reset:
A logic low on MR asserts reset. Reset remains asserted as long as MR is low, and for the
reset timeout period (t
RS
) after the reset conditions are terminated. Connect to V
CC
if not used.
Ground
Supply Voltage.
GND
V
CC
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PT7M6315US
Supervisory Circuit
Block Diagram
Vcc
MR
VCC Resistor
Divider
Timing
Delay
T.C.
Reference
GND
RST
Function Description
Power Monitor
A microprocessor’s (µP’s) reset input starts the µP in a known state. Whenever the µ is in an unknown state, it should be held in
P
reset. The supervisory circuits assert reset during power-up and prevent code execution errors during power-down or brownout
conditions.
On power-up, once Vcc reaches about 1.0V, RST is a guaranteed logic low of 0.4V or less. As Vcc rises, RST stays low. When
Vcc rises above the reset threshold V
RST
, an internal timer releases RST after about 200ms (PT7M6315USxxD3) or 1570ms
(PT7M6315USxxD4) or 26ms (PT7M6315USxxD2) or 1.6ms (PT7M6315USxxD1). RST asserts whenever Vcc drops below the
reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse, the pulse continues
for at least another 200ms (PT7M6315USxxD3) or 1570ms (PT7M6315USxxD4) or 26ms (PT7M6315USxxD2) or 1.6ms
(PT7M6315USxxD1). On power-down, once Vcc falls below the reset threshold, RST stays low and is guaranteed to be 0.4V or
less until Vcc drops below 1V.
Manual Reset
The manual-reset input (MR) allows reset to be triggered by a pushbutton switch. The switch is effectively debounced by the
1.6ms (PT7M6315USxxD1) or 26ms (PT7M6315USxxD2) or 200ms (PT7M6315USxxD3) or 1570ms (PT7M6315USxxD4)
reset pulse width.
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PT7M6315US
Supervisory Circuit
Maximum Ratings
Storage Temperature ............................................................-65 C to +150 C
Ambient Temperature with Power Applied .......................... -40
o
C to +85
o
C
Supply Voltage to Ground Potential (Vcc to GND) ..............-0.3V to +7.0V
DC Input Voltage (All inputs except Vcc and GND)......-0.3V to V
CC
+0.3V
DC Output Current (All outputs) ..........................................................30mA
Power Dissipation .......................................... 320mW (Depend on package)
o
o
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
DC Electrical Characteristics
(T
A
= -40~85º unless otherwise noted. Typical values are at T
A
= +25º
C,
C)
Description
Supply Voltage
Supply Current
Sym.
V
CC
I
CC
V
CC
= 3.6V. No load.
+25C
Voltage Threshold
V
TH-
-40C~85C
Hysteresis
V
HYS
V
TH+
- V
TH-*
I
OH
= 8mA, V
CC
= 5V
Output
Driving
Output low
V
OL
I
OH
= 4mA, V
CC
= 3V
I
OH
= -50µ V
CC
= 1V
A,
Open-Drain Output Leakage
Current
Internal pull-up resistor
Input High Voltage
I
LKG
R
P
V
IH
-
MR
MR
V
CC
< 4V
V
CC
> 4V
Input Low Voltage
V
IL
MR
V
CC
< 4V
V
CC
> 4V
-
(V
TH-
)
0.985
(V
TH-
)
0.975
-
-
-
-
-
32
0.7×
Vcc
2.4
-
-
-
V
TH-
V
TH-
50
-
-
-
-
63
-
-
-
-
10
(V
TH-
)
1.015
(V
TH-
)
1.025
-
0.4
0.3
0.09
500
100
-
V
-
0.3×
Vcc
V
0.8
nA
k
V
µA
V
-
V
CC
= 5.5V. No load.
Test Conditions
Min
1.0
-
Typ
-
-
Max
5.5
12
Unit
V
µA
mV
Note:
V
TH-
is voltage threshold when V
CC
falls from high to low. V
TH+
is voltage threshold when V
CC
rises from low to high.
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PT7M6315US
Supervisory Circuit
AC Electrical Characteristics
Timing diagram
t
SEN
VCC
V
RST
1V
0V
t
RS
t
RPD
t
RS
t
MD
t
RS
RST
1V
0V
t
MR
MR
V
IH
0.8V
0V
Uncertain state
(V
CC
= 1.0V to 5.5V, T
A
= -40~85º unless otherwise noted. Typical values are at T
A
= +25º
C,
C)
Sym.
Description
Test Conditions
Part No.
Min
-
6315USxxD1
1
6315USxxD2
17
t
RS
Reset Timeout Period
-
6315USxxD3
140
-
6315USxxD4
1120
t
RPD
Delay
-
-
-
t
SEN
Sensitivity
-
-
20
t
MD
t
MR
MR to Reset Delay
MR Pulse Width
-
-
-
-
-
1
Typ
1.6
26
200
1570
17
-
500
-
Max
2.2
40
280
2240
-
-
-
-
Unit
ms
ms
ms
ms
s
s
ns
s
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PT7M6315US
Supervisory Circuit
Mechanical Information
SOT143-4
Ordering Information
Part Number
PT7M6315USxxD1TBEX
PT7M6315USxxD2TBEX
PT7M6315USxxD3TBEX
PT7M6315USxxD4TBEX
Package Code
TB
TB
TB
TB
Package
Lead free and Green SOT143-4, Tape & Reel
Lead free and Green SOT143-4, Tape & Reel
Lead free and Green SOT143-4, Tape & Reel
Lead free and Green SOT143-4, Tape & Reel
Note:
“xx” refer to voltage range, see below table 1.
E=Lead-free and Green Packaging
Adding X suffix=Tape/Reel
Contact Pericom for availability.
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