BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR EC9509C/ 08C Introduction (General Description) Applications The EC9509C / 08C Series is a high-precision 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 SOT-23-5 SOT343 1.0 mA typ. (VDD=2.0 V) 1.1 mA typ. (VDD=3.5 V) such as electronic organizers, notebook PCs, cellular phones, digital cameras Constant voltage power monitor for cameras, communication equipment and video equipment microcomputers Pin Assignment High-precision detection voltage ±2.0 % (SOT-23-5) SOT343(SC82) 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” SOT-23-5 Pin No SOT343 Pin No SYMBOL DESCRITION 1 4 OUT VOLTAGE DETECTION PIN 2 2 VDD VOLTAGE INPUT PIN 3 1 VSS GROUND PIN 4 --- N.C 5 3 CD NO CONNECTION CONNECTION PIN CAPACITOR E-CMOS Corp.（http://www.ecmos.com.tw） Page 1 / 10 5D15N-Rev. F002 DELAY BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR EC9509C/ 08C Block Diagrams CMOS OUTPUT（EC9509C） OPEN DRAIN（EC9508C） Ordering Information PART NUMBER EC9508C XXB-F EC9508C XXB-G EC9508CXXC4-G EC9509C XXB-F EC9509C XXB-G MARKING ID 08CXXF 08CXXG XXYW 09CXXF 09CXXG PACKAGE SOT23-5 SOT23-5 SOT343 SOT23-5 SOT23-5 PACKING TYPE TAPE / REEL TAPE / REEL TAPE/ REEL TAPE / REEL TAPE / REEL Package Marking Indication SOT-23-5 Marking MARKING ID LOT NO. XX：Voltage YW：Date Code xxxxx E-CMOS Corp.（http://www.ecmos.com.tw） Page 2 / 10 5D15N-Rev. F002 BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR EC9509C/ 08C 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 -5 500 mW 250 mW SOT343 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 -- -VDET(S) X 0.98 N-channel VDS=0.5V Output Current of output transistor IOUT VDD= 2.4V P-channel VDS=VDD-0.5V VDD=4.8 V Delay time td E-CMOS Corp.（http://www.ecmos.com.tw） Min CD=4.7nF VDD=3V Page 3 / 10 Typ -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 6 13 20 ms 4 5D15N-Rev. F002 BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR EC9509C/ 08C Test circuit 1. 2. 3. 4. 5. E-CMOS Corp.（http://www.ecmos.com.tw） Page 4 / 10 5D15N-Rev. F002 BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR EC9509C/ 08C 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 / 10 5D15N-Rev. F002 BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR EC9509C/ 08C 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. The delay time changes according to the external capacitor C D. E-CMOS Corp.（http://www.ecmos.com.tw） Page 6 / 10 5D15N-Rev. F002 BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR EC9509C/ 08C 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 / 10 5D15N-Rev. F002 BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR EC9509C/ 08C Application Circuit Examples 1. Microcomputer reset circuits With the EC9509CXX 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 / 10 5D15N-Rev. F002 BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR EC9509C/ 08C PACKAGE TYPE : SOT23-5 E-CMOS Corp.（http://www.ecmos.com.tw） Page 9/10 EC9509C/08C_2E04N-Rev. 001 BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR EC9509C/ 08C PACKAGE TYPE : SOT343 E-CMOS Corp.（http://www.ecmos.com.tw） Page 10/10 EC9509C/08C_2E04N-Rev. 001