PT7M6518-6550(CL/CH /NL)
Voltage Detector with Adjustable Delay Time
Features
Operate from VCC of 1.2V to 5.5V
Capacitor-Adjustable Delay
Active-High/-Low Output Options
Open-Drain /Push-Pull Output Options
Detect Voltage Threshold Accurate: 2.5% in full
Temperature from -40° to +85°
C
C
Low Supply Current (2µ Typ.)
A,
Ultra-Small 4-Pin UDFN Package or SOT23-5
Package or SC70-4 package
Description
The PT7M6518-6550 is a family of small, low-power,
voltage-monitoring circuits with adjustable delay time
capability. PT7M65xx series features a highly accurate
under voltage detector with hysteresis and an
externally programmable time delay generator. This
combination of features prevents erratic system reset
operation.
PT7M65xx series provide external capacitor to adjust
for set up delay time.
All series operate from a 1.2V to 5.5V supply voltage
and are fully specified over the -40° to +85°
C
C
operating temperature range. This family is available
in ultra-small 4-pin UDFN (1.6mm x 1.6mm) and
SC70-4 and SOT23-5 packages.
Applications
Computers/Servers/Networking
Medical Equipment
Critical µ Monitoring
P
Intelligent Instruments
Set-Top Boxes/Portable Equipment
Pin Configuration
Pin Description
Name
RST
RST
GND
V
CC
Cd
Type
O
O
P
P
I/O
Description
Active Low Reset Output:
RST is asserted to LOW when V
CC
drops below voltage threshold V
TH-
value
(PT7M65xxCL/NL). PT7M65xxCL output with push-pull. PT7M65xxNLoutput with open-drain which
requires external pullup resistance.
Active High Reset Output.
RST is asserted High when V
CC
drops below voltage threshold V
TH-
voltage
(PT7M65xxCH). PT7M65xxCH output with push-pull.
Ground.
Supply Voltage.
Operation voltage from 1.2V to 5.5V. By pass 0.1uF ceramic capacitor to GND for noise
decoupling.
Capacitor Delay.
Adjustable. Connect an external capacitor from Cd pin to GND to set the Reset inactive
delay time (timeout period) after VCC rise over voltage threshold V
TH+
. Do not short Cd pin to GND directly.
The delay time equation as t
delay
=Cd(µF)× 10
6
µ +40µ
4×
s
s.
All trademarks are property of their respective owners.
2017-04-0006
www.diodes.com
5/10/2017
PT0450-3
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PT7M6518-6550(CL/CH /NL)
Table 1 Function comparison
Reset Output
Item
1
2
3
Part No.
PT7M65xxCL
PT7M65xxCH
PT7M65xxNL
Open-Drain
Active high
Active low
-
-
-
-
-
Push-Pull
Active high
Active low
-
-
-
-
Threshold
1.8V to 5.0V in 100mV
increments
Maximum Ratings
Storage Temperature ............................................................-65
o
C to +150
o
C
Ambient Temperature with Power Applied.......................... -40
o
C to +85
o
C
Supply Voltage to Ground Potential (Vcc to GND) ..............-0.3V to +6.0V
DC Input Voltage (All inputs except Vcc and GND)......-0.3V to V
CC
+0.3V
DC Output Current (All outputs) ..........................................................20mA
Power Dissipation .......................................... 320mW (Depend on package)
DC Electrical Characteristics
Description
Supply Voltage
Sym.
V
CC
Test Conditions
T
A
= 0~70º
C
T
A
= -40~85º
C
V
CC
= 3.6V. No load.
V
CC
= 5V. No load.
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.
(V
CC
= 1.2V to 5.5V, T
A
= -40~85º unless otherwise noted. Typical values are at T
A
= +25º
C,
C)
Min
1.0
Typ.
-
Max.
5.5
Unit
V
µA
µA
1.2
-
-
-
1.3
2.0
-
-
-
-
-
-
-
5.5
3.6
5.0
-
-
-
0.3
0.3
0.4
1
(V
TH-
)
1.015
(V
TH-
)
1.025
(V
TH+
)
1.015
(V
TH+
)
1.025
Supply Current
I
CC
V
CC
≥ 1.8V, I
source
= 1mA
Output high
(push-pull)
Output
Driving
Output low
(open-drain or
push-pull)
Open-Drain Output Leakage
Current
V
OL
V
OH
0.8×
Vcc
0.8×
Vcc
0.8×
Vcc
-
-
-
-
(V
TH-
)
0.985
(V
TH-
)
0.975
(V
TH+
)
0.985
(V
TH+
)
0.975
V
CC
≥ 2.5V, I
source
= 3mA
V
CC
≥ 4.5V, I
source
= 8mA
V
CC
≥ 1.2V, I
sink
= 1mA
V
CC
≥ 2.5V, I
sink
= 4mA
V
CC
≥ 4.5V, I
sink
= 9mA
V
V
I
LKG
-
+25C
A
V
TH-
V
TH-
V
TH+
V
TH+
250
1.00
200
V
TH-
VCC Detect Voltage
Threshold
V
TH+
-40C~85C
Delay charge current
Delay voltage Threshold
Cdelay pulldown Resistance
Icd
Vtcd
Rcdelay
-
Cdelay rising
-
-40C~85C
+25C
V
200
0.95
300
1.05
500
nA
V
Ω
Note:
V
TH+
= 1.05
V
TH-
。
V
TH-
is voltage threshold when Vcc falls from high to low. V
TH
＋
is voltage threshold when Vcc rises from low to high.
All trademarks are property of their respective owners.
2017-04-0006
www.diodes.com
5/10/2017
PT0450-3
2
PT7M6518-6550(CL/CH /NL)
AC Electrical Characteristics
PT7M65xxNL Timing diagram
VTH+
VCC
VTH-
RST
tdelay
t
PD
(V
CC
= 1.2V to 5.5V, T
A
= -40~85º unless otherwise noted. Typical values are at T
A
= +25º
C,
C)
Sym.
t
PD
t
delay
Description
Reset active Propagation Delay
Reset inactive delay time after
VCC >V
TH+
(Reset Timeout Period).
-
Test Conditions
Min.
-
Typ.
50
Cd(F)×
4
6
×
+40
10
Max.
-
-
Unit
s
s
Function Description
PT7M65xx has adjustable reset output delay time function throw Cd pin with cap. Internal 250nA sourcing will charge
the external cap throw Cd pin when VCC is rise above V
TH+
, and reset output will disalert after Cd pin voltage is
reaches 1V. This delay time is t
delay
=Cd (µF) × 10
6
µs
+40µs. For example, if Cd=1nF, the t
delay
=0.001× 10
6
µs
4×
4×
+40µs=4040µs. Cd pin voltage will be discharged when reset output is assert ok at Vcc falls below Vth-, the discharge
resistance is about 200Ω.
All trademarks are property of their respective owners.
2017-04-0006
www.diodes.com
5/10/2017
PT0450-3
3
PT7M6518-6550(CL/CH /NL)
Block Diagram
RST (PT7M65xxCH)
RST (PT7M65xxCL)
Cd
Typical Operation Circuit
PT7M65xxNL Application Example
Note:
Capacitor-Adjustable Delay application.
Connect an external capacitor (C
Cd
) from Cd to GND delay period.
t
delay
=Cd(µf)× 10
6
µs
+40µs
4×
There is a fixed short delay (40µs, typ.) for the output deasserting when Vin falls below Vth.
All trademarks are property of their respective owners.
2017-04-0006
www.diodes.com
5/10/2017
PT0450-3
4
PT7M6518-6550(CL/CH /NL)
Mechanical Information:
TA5 (SOT23-5)
All trademarks are property of their respective owners.
2017-04-0006
www.diodes.com
5/10/2017
PT0450-3
5
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