E-CMOS EC9519CXXB1R Voltage detector Datasheet

VOLTAGE DETECTOR
Introduction
(General Description)
EC9518C/
EC9519C
Applications
The EC9518C / 9519C Series is a highprecision voltage detector developed using
CMOS process. The detection voltage is fixed
internally with an accuracy of ±2.0 %. A time
delayed reset can be accomplished with the
addition of an external capacitor. Two output
 Power supply monitor for portable equipment
forms, N-channel open-drain and CMOS
output, are available.
 Power monitor and reset for CPUs and
Features
Packages
 Ultra-low current consumption
such as electronic organizers, notebook PCs,
cellular phones, digital cameras
 Constant voltage power monitor for cameras,
communication equipment and video
equipment
microcomputers
SOT-23-3
1.0 mA typ. (VDD=2.0 V)
1.1 mA typ. (VDD=3.5 V)
 High-precision detection voltage ±2.0 %
Pin Assignment
 COperating voltage range 2.0 V to 6.0 V
 Detection voltage 2.2 V to 3.1 V (0.1 V step)
 Hysteresis characteristics 5 % typ.
 Two output forms: CMOS
output active “L” Open-drain
output active “L”
E-CMOS Corp.(http://www.ecmos.com.tw)
NO
SYMBOL
1
OUT
VOLTAGE DETECTION PIN
2
VSS
GROUND PIN
3
VDD
VOLTAGE INPUT PIN
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DESCRITION
3H02N-Rev. P001
VOLTAGE DETECTOR
EC9518C/
EC9519C
Block Diagrams
CMOS OUTPUT(EC9519C)
OPEN DRAIN(EC9518C)
Ordering Information
PART NUMBER
MARKING ID
EC9518C XXB1R
18CXX
LLLLL
EC9519C XXB1R
19CXX
LLLLL
E-CMOS Corp.(http://www.ecmos.com.tw)
Marking Information
XX:Voltage Detection
LLLLL:Lot No
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PACKAGE
PACKING
TYPE
SOT23-3
TAPE / REEL
SOT23-3
TAPE / REEL
3H02N-Rev. P001
VOLTAGE DETECTOR
EC9518C/
EC9519C
Absolute Maximum Ratings
PARAMETER
SYMBOL
POWER SUPPLY VOLTAGE
VDD - VSS
CD PIN INPUT VOLTAGE
RATING
UNIT
8
V
VCD
VSS -0.3 TO VDD +0.3
V
OUTPUT VOLTAGE
VOUT
VSS -0.3 TO VDD +0.3
V
OUTPUT CURRENT
IOUT
4
mA
POWER DISSIPATION
PD SOT23 -5
150
mW
OPERATING TEMPERATURE
TOPR
-40 TO +85
℃
STORAGE TEMPERATURE
TSTG
-40 TO +125
℃
JUNCTION TEMPERATURE
Tj(max)
150
℃
JUNCTION TO AMBIENT THERMAL RESISTANCE θja
347
℃/W
θjc
148
℃/W
JUNCTION TO CASE THERMAL RESISTANCE
Electrical Characteristics
CMOS output products
(Ta=25°C unless otherwise specified)
Parameter
Symbol
Conditions
Detection voltage
-VDET
--
Hysteresis width
VHYS
--
Current consumption
ISS
VDD=4V
Operating voltage
VDD
--
IOUT
X 0.98
VDD= 2.4V
P-channel VDS=VDD-0.5V
VDD=4.8 V
Delay time
td
E-CMOS Corp.(http://www.ecmos.com.tw)
Typ
-VDET(S)
N-channel VDS=0.5V
Output Current of output transistor
Min
Input Signal Ramp=3V/ms
Page 3 / 9
-VDET
Max
-VDET(S)
X 1.02
Unit
Test
circuit
V
1
V
1
-VDET
-VDET
-VDET
X0.03
X0.05
X0.08
--
4.5
6.5
uA
2
2.0
--
6.0
V
1
2.88
4.98
--
mA
3
1.43
2.39
--
mA
5
---
---
us
4
200
3H02N-Rev. P001
VOLTAGE DETECTOR
EC9518C/
EC9519C
Test circuit
1.
2.
3.
4.
5.
E-CMOS Corp.(http://www.ecmos.com.tw)
Page 4 / 9
3H02N-Rev. P001
VOLTAGE DETECTOR
EC9518C/
EC9519C
Timing chart
1. CMOS active low output
2. Nch open-drain active low output
Note:For values of VDD less than minimum operating voltage, values of OUT terminal output is free of
the shaded region.
E-CMOS Corp.(http://www.ecmos.com.tw)
Page 5 / 9
3H02N-Rev. P001
VOLTAGE DETECTOR
EC9518C/
EC9519C
Definition of Technical Terms
1. Detection voltage (-VDET)
Detection voltage -VDET is a voltage at which the output turns to low. This detection voltage varies slightly among
products of the same specification. The variation of detection voltage between the specified minimum [(-VDET) min.]
and maximum [(-VDET) max.] is called the detection voltage range (See Figure A).
2. Release voltage (+VDET)
Release voltage +VDET is a voltage at which the output turns to high. This release voltage varies slightly among
products of the same specification. The variation of release voltage between the specified minimum [(+VDET) min.]
and maximum [(+VDET) max.] is called the release voltage range (See B).
FIGURE A
FIGURE B
3. Hysteresis width (VHYS)
Hysteresis width is the voltage difference between the detection voltage and the release voltage. The existence of
the hysteresis width avoids malfunction caused by noise on input signal.
4. Delay time (td)
Delay time is a time internally measured from the instant at which VDD pin exceeds the release voltage (+VDET) to
the point at which the output of the OUT pin inverts.
E-CMOS Corp.(http://www.ecmos.com.tw)
Page 6 / 9
3H02N-Rev. P001
VOLTAGE DETECTOR
EC9518C/
EC9519C
5. Short-circuit current
Short-circuit current refers to the current which flows instantaneously at the time of detection and release of a
voltage detector. Short-circuit current is large in CMOS output products, and small in N channel open-drain output
products.
6. Oscillation
In applications where a resistor is connected to the voltage detector input as shown in Figure , taking a CMOS
active low product for example, the short-circuit current, which flows at release when the output goes from low to
high, causes a voltage drop equal to [short-circuit current] × [input resistance] across the resistor. When the input
voltage falls below the detection voltage -VDET as a result, the output voltage goes to low level. In this state, the
short-circuit current stops and its resultant voltage drop disappears, and the output goes from low to high.
Short-circuit current again starts flowing, a voltage drop appears, and oscillation is finally induced by repeating the
process.
Following is an example for bad implementation: input voltage divider for a CMOS output product.
Standard Circuit
E-CMOS Corp.(http://www.ecmos.com.tw)
Page 7 / 9
3H02N-Rev. P001
VOLTAGE DETECTOR
EC9518C/
EC9519C
Application Circuit Examples
1. Microcomputer reset circuits
With the EC9519CXX Series which has a low operating voltage, a high-precision detection voltage and hysteresis
characteristic, the reset circuits shown in Figures A to B can be easily constructed.
(Nch open-drain output products only)
Figures B
Figures A
2. Change of detection voltage
In Nch open-drain output products of the EC9508CXX Series, detection voltage can be changed using resistance
dividers or diodes as shown in Figures C and D. Hysteresis width is also changed.
Figures C
Figures D
Note1: If RA and RB are large, the hysteresis width may also be larger than the value given by the equation above due to
short-circuit current (which flows slightly in an N channel open-drain product).
Note2: RA should be 75k Ω or less to prevent oscillation.
E-CMOS Corp.(http://www.ecmos.com.tw)
Page 8 / 9
3H02N-Rev. P001
VOLTAGE DETECTOR
EC9518C/
EC9519C
PACKAGE TYPE : SOT23-3
Page 9 / 9
E-CMOS Corp.(http://www.ecmos.com.tw)
Page 9 / 9
3H02N-Rev. P001
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