NCP304A
Voltage Detector Series
The NCP304A is a second generation ultra−low current voltage
detector. This device is specifically designed for use as a reset
controller in portable microprocessor based systems where extended
battery life is paramount.
This device features a highly accurate undervoltage detector with
hysteresis which prevents erratic system reset operation as the
comparator threshold is crossed.
The NCP304A consists of complementary output devices that are
available with either an active high or active low reset output.
The NCP304A is available in the SC−82AB package with standard
undervoltage thresholds. Additional thresholds that range from 0.9 V
to 4.9 V in 100 mV steps can be manufactured.
Features
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SC−82AB
SQ SUFFIX
CASE 419C
•
•
•
•
•
•
•
•
•
•
Quiescent Current of 1.0
mA
Typical
High Accuracy Undervoltage Threshold of 2.0%
Wide Operating Voltage Range of 0.8 V to 10 V
Complementary Output
Active Low or Active High Reset Output
This is a Pb−Free Device
Microprocessor Reset Controller
Low Battery Detection
Power Fail Indicator
Battery Backup Detection
PIN CONNECTIONS AND
MARKING DIAGRAM
V
in
Reset
Output
4
3
SUD M
G
G
Typical Applications
NC
1
2 GND
(Top View)
SUD
= Specific Device Code
M
= Date Code
G
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
NCP304ALSQxxT1
Complementary Output Configuration
Input
4
See detailed ordering and shipping information in the ordering
information section on page 5 of this data sheet.
*
V
ref
3
Reset Output
2
GND
This device contains 38 active transistors.
*The representative block diagram depicts active low reset output ‘L’ suffix devices.
The comparator input is interchanged for the active high output ‘H’ suffix devices.
Figure 1. Representative Block Diagrams
©
Semiconductor Components Industries, LLC, 2008
September, 2008
−
Rev. 1
1
Publication Order Number:
NCP304A/D
NCP304A
MAXIMUM RATINGS
(Note 1)
Rating
Input Power Supply Voltage (Pin 4)
Output Voltage (Pin 3)
Complementary, NCP304A
Output Current (Pin 3) (Note 2)
Thermal Resistance, Junction−to−Air
Maximum Junction Temperature
Storage Temperature Range
Latchup Performance (Note 3)
Positive
Negative
Symbol
V
in
V
OUT
I
OUT
R
qJA
T
J
T
stg
I
LATCHUP
Value
12
−0.3
to V
in
+0.3
70
285
+125
−55
to +150
500
170
Unit
V
V
mA
°C/W
°C
°C
mA
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per MIL−STD−883, Method 3015.
Machine Model Method 200 V.
2. The maximum package power dissipation limit must not be exceeded.
TJ(max)
−T
A
PD
+
R
qJA
3. Maximum Ratings per JEDEC standard JESD78.
ELECTRICAL CHARACTERISTICS
(For all values T
A
= 25°C, unless otherwise noted.)
Characteristic
NCP304A
−
4.3
Detector Threshold (Pin 4, V
in
Decreasing)
Detector Threshold Hysteresis (Pin 4, V
in
Increasing)
Supply Current (Pin 4)
(V
in
= 4.14 V)
(V
in
= 6.3 V)
Maximum Operating Voltage (Pin 4)
Minimum Operating Voltage (Pin 4)
(T
A
=
−40°C
to 85°C)
Reset Output Current (Pin 3, Active Low ‘L’ Suffix Devices)
N−Channel Sink Current, NCP304A
(V
OUT
= 0.05 V, V
in
= 0.70 V)
(V
OUT
= 0.50 V, V
in
= 1.5 V)
P−Channel Source Current, NCP304A
(V
OUT
= 5.9 V, V
in
= 8.0 V)
Reset Output Current (Pin 3, Active High ‘H’ Suffix Devices)
N−Channel Sink Current, NCP304A
(V
OUT
= 0.5 V, V
in
= 5.0 V)
P−Channel Source Current, NCP304A
(V
OUT
= 0.4 V, V
in
= 0.7 V)
(V
OUT
= GND, V
in
= 1.5 V)
Propagation Delay Input to Output (Figure 2)
NCP304A Series
Output Transition, High to Low (Note 4)
Output Transition, Low to High (Note 4)
t
pHL
t
pLH
−
−
10
21
−
60
I
OUT
6.3
0.011
0.525
11
0.04
0.6
−
−
−
ms
V
DET−
V
HYS
I
in
4.214
0.129
−
−
−
−
−
4.3
0.225
−
−
−
0.55
0.65
4.386
0.301
3.0
3.9
10
0.70
0.80
V
V
mA
Symbol
Min
Typ
Max
Unit
V
in(max)
V
in(min)
I
OUT
V
V
mA
0.01
1.0
1.5
0.05
2.0
3.0
−
−
−
mA
4. The time interval between the rising edge of V
DD
input pulse from 0.7 V to (+V
DET
) +2.0 V and output voltage level becoming to V
DD
/2.
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2
NCP304A
V
DET+
+ 2
Input Voltage, Pin 2
0.7
0V
5V
Reset Output Voltage, Pin 1
0.5 V
0V
2.5 V
NCP305L
Open Drain
V
DET+
+ 2
Reset Output Voltage, Pin 1
V
DET+
+ 2
2
0V
0.1 V
t
pLH
t
pHL
NCP304AL
Complementary
NCP304A is measured with a 10 pF capacitive load. The reset output voltage waveforms are shown for the active low ‘L’ devices.
The upper detector threshold, V
DET+
is the sum of the lower detector threshold, V
DET−
plus the input hysteresis, V
HYS
.
Figure 2. Propagation Delay Measurement Conditions
Table 1. NCP304A SERIES ELECTRICAL CHARACTERISTIC TABLE FOR 0.9
−
4.9 V
Detector Threshold
Hysteresis
Supply Current
V
in
Low
I
in
(mA)
(Note 5)
Max
0.301
Typ
1.1
V
in
High
I
in
(mA)
(Note 6)
Typ
1.3
N−Channel Sink Cur-
rent
V
in
Low
I
OUT
(mA)
(Note 7)
Typ
V
in
High
I
OUT
(mA)
(Note 8)
Typ
P−Channel
Source
Current
I
OUT
(mA)
(Note 9)
Typ
3.0
Detector Threshold
V
DET−
(V)
Part Number
NCP304ALSQ43T1
5.
6.
7.
8.
9.
Min
4.214
Typ
4.3
Max
4.386
Min
0.129
V
HYS
(V)
Typ
0.215
V
in
= V
DET−
−
0.16 V
Condition 2: V
in
= V
DET−
+ 2.0 V
Condition 3: V
in
= 0.7 V, V
OUT
= 0.05 V, Active Low ‘L’ Suffix Devices
Condition 4: V
in
= 1.5 V, V
OUT
= 0.5 V, Active Low ‘L’ Suffix Devices
Condition 5: V
in
= 8.0 V, V
OUT
= 5.9 V, Active Low ‘L’ Suffix Devices
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NCP304A
V
DET
, DETECTOR THRESHOLD VOLTAGE (V)
4.9
V
OUT
, OUTPUT OUTPUT (V)
4.8
V
DET+
4.7
4.6
4.5
4.4
4.3
−50
V
DET−
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
0
1.0
T
A
=
−30°C
T
A
= 25°C
T
A
= 85°C
2.0
4.0
3.0
V
in
, INPUT VOLTAGE (V)
5.0
6.0
−25
0
25
50
75
100
T
A
, AMBIENT TEMPERATURE (°C)
Figure 3. NCP304A Series 4.5 V
Detector Threshold Voltage vs. Temperature
2.0
T
A
= 25°C
I
in
, INPUT CURRENT (mA)
1.5
I
OUT
, OUTPUT SINK CURRENT (mA)
12
10
Figure 4. NCP304AL Series 4.5 V
Reset Output Voltage vs. Input Voltage
T
A
=
−30°C
8.0
6.0
4.0
2.0
0
T
A
= 25°C
T
A
= 85°C
1.0
0.5
0
0
2.0
6.0
4.0
V
in
, INPUT VOLTAGE (V)
8.0
10
0
1.0
2.0
3.0
4.0
5.0
V
in
, INPUT VOLTAGE (V)
Figure 5. NCP304A Series 4.5 V
Input Current vs. Input Voltage
Figure 6. NCP304AH Series 4.5 V
Reset Output Sink Current vs. Input Voltage
OPERATING DESCRIPTION
The NCP304A is a second generation ultra−low current
voltage detectors. Figures 7 and 8 show a timing diagram
and a typical application. Initially consider that input
voltage V
in
is at a nominal level and it is greater than the
voltage detector upper threshold (V
DET+
), and the reset
output (Pin 3) will be in the high state for active low devices,
or in the low state for active high devices. If there is a power
interruption and V
in
becomes significantly deficient, it will
fall below the lower detector threshold (V
DET−
). This
sequence of events causes the Reset output to be in the low
state for active low devices, or in the high state for active
high devices. After completion of the power interruption,
V
in
will again return to its nominal level and become greater
than the V
DET+
. The voltage detector has built−in hysteresis
to prevent erratic reset operation as the comparator threshold
is crossed.
Although this device is specifically designed for use as a
reset controller in portable microprocessor based systems, it
offers a cost−effective solution in numerous applications
where precise voltage monitoring is required.
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4
NCP304A
Input Voltage, Pin 2
V
in
V
DET
+
V
DET−
Reset Output (Active Low), Pin 1
V
in
V
DET
+
V
DET−
0V
Reset Output (Active High), Pin 1
V
in
V
DET
+
V
DET−
0V
Figure 7. Timing Waveforms
APPLICATION CIRCUIT INFORMATION
V
DD
V
DD
4
Input
3
Reset Output
*
Reset
Microprocessor
NCP304A
Series
2
GN
D
*
Required for
NCP305
GND
Figure 8. Microprocessor Reset Circuit
ORDERING INFORMATION
Device
NCP304ALSQ43T1G
Threshold
Voltage
4.3
Output
Type
CMOS
Reset
Active
Low
Marking
SUD
Package
SC−82AB
(Pb−Free)
Shipping
†
3000 / Tape & Reel
NOTE: Additional active low threshold devices, ranging from 0.9 V to 4.9 V in 100 mV increments and NCP304A active high output devices,
ranging from 0.9 V to 4.9 V in 100 mV increments can be manufactured. Contact your ON Semiconductor representative for availability.
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Spe-
cifications Brochure, BRD8011/D.
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