RNA51953A,B Voltage Detecting, System Resetting IC Series REJ03D0911-0100 Rev.1.00 Oct 10, 2008 Description RNA51953A,B are semiconductor integrated circuits designed for detecting supply voltage and resetting all types of logic circuits such as CPUs. They include a built-in delay circuit to provide the desired retardation time simply by adding an external capacitor. They fined extensive applications, including battery checking circuit, level detecting circuit and waveform shaping circuit. Features • Few external parts • Large delay time with a capacitor of small capacitance (td ≈ 100 ms, at 0.33 µF) • Low threshold operating voltage (Supply voltage to keep low-state at low supply voltage): 0.6 V (Typ) at RL = 22 kΩ • Wide supply voltage range: 2 V to 17 V • Wide application range • Ordering Information Taping Abbreviation (Quantity) Package Type Package Code Package Abbreviation RNA51953AFPH0 SOP-8 pin PRSP0008DE-C FP H (2,500 pcs / Reel) 0 (Ni/Pd/Au) RNA51953BFPH0 SOP-8 pin PRSP0008DE-C FP H (2,500 pcs / Reel) 0 (Ni/Pd/Au) Part Name Surface Treatment Application • Reset circuit of Pch, Nch, CMOS, microcomputer, CPU and MCU, Reset of logic circuit, Battery check circuit, switching circuit back-up voltage, level detecting circuit, waveform shaping circuit, delay waveform generating circuit, DC/DC converter, over voltage protection circuit Recommended Operating Condition • Supply voltage range: 2 V to 17 V Outline and Article Indication • RNA51953A, B Type No. R953A YMWC CCC R953B YMWC CCC SOP-8 Pin No.1 REJ03D0911-0100 Rev.1.00 Oct 10, 2008 Page 1 of 9 Trace Code Lot No. Y : Year Code (the last digit of year) M : Month Code W : Week Code C : Control Code RNA51953A,B Pin Arrangement RNA51953AFP/BFP NC 1 8 NC NC 2 7 Power-supply NC 3 6 Output 5 Delay capacitor GND 4 (Top view) NC: No Connection Outline: PRSP0008DE-C Block Diagram RNA51953A, B Powersupply A: Built-in Load B: Open Collector 5µA Typ R1 25µA Typ Output – – + R2 1.25V GND Delay capacitor Operating Waveform Output state Supply voltage RNA51953A, B 4.25V 0.65V t H td td L Output undefined REJ03D0911-0100 Rev.1.00 Oct 10, 2008 Page 2 of 9 td ≈ 0.34 × Cd(pF) µs t RNA51953A,B Absolute Maximum Ratings (Ta = 25°C, unless otherwise noted) Item Supply voltage Output sink current Symbol VCC Isink Unit V mA Pd Ratings 18 6 VCC 18 400 Output voltage VO Power dissipation Thermal derating Kθ 4.4 mW/°C Operating temperature Storage temperature Topr Tstg –40 to +85 –55 to +125 °C °C V mW Conditions Type A (output with constant current load) Type B (open collector output) 8-pin SOP (PRSP0008DE-C) Refer to the thermal derating curve. 8-pin SOP (PRSP0008DE-C) Electrical Characteristics (Ta = 25°C, unless otherwise noted) • “L” reset type Item Symbol Min Typ Max Detecting voltage VS 4.05 4.25 4.45 V Hysteresis voltage ∆VS 30 50 80 mV Detecting voltage temperature coefficient VS/∆T — 0.01 — %/°C Circuit current ICC — 450 680 — 420 630 Unit µA Test Conditions Type A, VCC = 5V Type B, VCC = 5V Delay time tpd 1.6 3.4 7.0 ms Cd = 0.01µF * Constant current Ipd –8 –5 –3 µA VCC = 5V Output saturation voltage Vsat — 0.2 0.4 V VCC = 4V, Isink = 4mA Threshold operating voltage VOPL — 0.67 0.8 — 0.55 0.7 Output leakage current IOH — — 30 nA Type B V RL = 2.2kΩ, Vsat ≤ 0.4V RL = 100kΩ, Vsat ≤ 0.4V Output load current IOC –40 –25 –17 µA Type A, VCC = 5V, VO = 1/2 × VCC Output high voltage VOH VCC–0.2 VCC–0.06 — V Type A Note: Please set the desired delay time by attaching capacitor of the range between 4700 pF and 10 µF. REJ03D0911-0100 Rev.1.00 Oct 10, 2008 Page 3 of 9 RNA51953A,B Typical Characteristics Detection Voltage vs. Ambient Temperature 4.34 Thermal Derating 300 200 100 0 0 Delay Capacitance Cd (µF) Detection Voltage VS (V) 8-pin SOP (PRSP0008DE-C) 400 25 50 75 85 100 4.32 4.30 4.28 4.26 VSL 4.24 0 20 40 60 80 100 Ambient Temperature Ta (°C) Ambient Temperature Ta (°C) Delay Capacitance vs. Delay Time Delay Time vs. Ambient Temperature 6 10 7 V CC = 5V 5 3 CD = 0.01µF 1 7 5 3 0.1 7 5 3 0.01 7 5 3 0.001 0.1 3 57 1 5 4 VCC = 5V 3 1 0 –40 –20 3 5 7 10 3 5 7 100 3 5 7 1000 –8 –6 –4 –2 0 20 40 60 80 100 Ambient Temperature Ta (°C) REJ03D0911-0100 Rev.1.00 Oct 10, 2008 Page 4 of 9 20 40 60 80 100 Threshold Operating Voltage 1.0 Output Voltage VOUT (V) VCC = 5V VCC = 15V 0 –40 –20 0 Ambient Temperature Ta (°C) Canstant Current at Cd pin vs. Ambient Temperature –12 –10 10V VCC = 15V 2 Delay Time tpd (ms) Canstant Current at Cd pin Ipd (µA) VSH 4.22 –40 –20 125 Delay Time tpd (ms) Power Dissipation Pd (mW) 500 Ta = 25°C 0.8 0.6 RL = 2.2kΩ 0.4 RL = 22kΩ RL = 100kΩ 0.2 0 0 0.2 0.4 0.6 0.8 Supply Voltage VCC (V) 1.0 RNA51953A,B Output Load Current vs. Output Voltage (RNA51953A) 0.3 Output Load Current ICC (µA) Output Saturation Voltage Vsat (V) Output Saturation Voltage vs. Output Sink Current VCC = 4V 0.2 0.1 0 0 1 2 3 4 5 6 Output Sink Current Isink (mA) Circuit Current ICC (µA) Circuit Current vs. Ambient Temperature (RNA51953B) 700 600 500 VCC = 5V 400 300 200 100 0 –40 –20 0 20 40 60 80 100 Ambient Temperature Ta (°C) REJ03D0911-0100 Rev.1.00 Oct 10, 2008 Page 5 of 9 –40 –30 –20 VCC = 5V VCC = 10V VCC = 15V –10 0 0 4 8 12 Output Voltage VO (V) 16 RNA51953A,B Example of Application Circuit Reset Circuit of RNA51953 Powersupply Powersupply RL Output RESET Logic circuit RNA51953x GND VCC Delay capacitor GND Cd Figure 1 Reset Circuit of RNA51953 Notes: 1. When the voltage is anything except 4.25 V, RNA51957 are used. In this case, the detecting supply voltage is 1.25 × (R1 +R2)/R2 (V) approximately. The detecting supply voltage can be set between 2 V and 15 V. 2. The delay time is about 0.34 × Cd (pF) µs. 3. If the RNA51953 and the logic circuit share a common power source, type A (built-in load type) can be used whether a pull-up resistor is included in the logic circuit or not. 4. The logic circuit preferably should not have a pull-down resistor, but if one is present, add load resistor RL to overcome the pull-down resistor. 5. When the reset terminal in the logic circuit is of the low reset type, RNA51953 and RNA51957 are used. 6. When a negative supply voltage is used, the supply voltage side of RNA51953 and the GND side are connected to negative supply voltage respectively. Case of Using Reset Signal except Supply Voltage in the RNA51953 (b) Reset at transistor ON (a) Reset at ON Powersupply Out put RL RNA51953x GND Delay capacitor Powersupply VCC Powersupply RESET Logic circuit Out put RL RNA51953x GND GND Cd Delay capacitor Powersupply RESET Logic circuit GND Cd Control signal Figure 2 Case of Using Reset Signal except Supply Voltage in the RNA51953 REJ03D0911-0100 Rev.1.00 Oct 10, 2008 Page 6 of 9 VCC RNA51953A,B Notice for use About the Power Supply Line 1. About bypass capacitor Because the ripple and the spike of the high frequency noise and the low frequency are superimposed to the power supply line, it is necessary to remove these. Therefore, please install C1 and C2 for the low frequency and for the high frequency between the power supply line and the GND line as shown in following figure 3. VCC + C1 C2 Power-supply Output Example of ripple noise measures RNA51953 GND Delay capacitor Cd Figure 3 Example of Ripple Noise Measures Setting of Delay Capacity Please use capacitor Cd for the delay within the range of 10 µF or less. When a value that is bigger than this is set, the problem such as following (1), (2), and (3) becomes remarkable. t VCC tpd Output tPHL Figure 4 Time Chart at Momentary Voltage-Decrease (1) The difference at delay time becomes remarkable. A long delay setting of tens of seconds is fundamentally possible. However, when set delay time is lengthened, the range of the difference relatively grows, too. When a set value is assumed to be ‘tpd’, the difference occurs in the range from 0.47 × tpd to 2.05 × tpd. For instance, 34 seconds can be calculated at 100 µF. However, it is likely to vary within the ranges of 16-70 seconds. (2) Difficulty to react to a momentary voltage decrease. For example, the reaction time tPHL is 10 µs when delay capacitor Cd = 0.1 µF. The momentary voltage-decrease that is longer than such tPHL are occurs, the detection becomes possible. When the delay capacitance is enlarged, tPHL also becomes long. For instance, it becomes about 100 to 200 µs in case of circuit constant C1 = 100 µF. (Characteristic graph 1 is used and extrapolation in case of Cd = 100 µF.) Therefore, it doesn't react to momentary voltage-decrease that is shorter than this. (3) Original delay time is not obtained. When the momentary voltage-decrease time ‘t’ is equivalent to tPHL, the discharge becomes insufficient and the charge starts at that state. This phenomenon occurs at large capacitance. And, original delay time tpd is not obtained. Please refer to characteristic graph 2. (Delay time versus input pulse width) REJ03D0911-0100 Rev.1.00 Oct 10, 2008 Page 7 of 9 RNA51953A,B Characteristic Graph 1 Reaction Time vs. Delay Capacitance (Example data) Characteristic Graph 2 Delay Time vs. Momentary Voltage Decrease Pulse Width (Example data) 10000 Delay Time tpd (ms) Reaction Time tPHL (µs) 1000 200 100 10 1 0.01 0.1 1 10 Delay Capacitance Cd (µF) 1000 100 Delay Capacitance 0.01µF 0.033µF 0.1µF 0.33µF 1µF 2.2µF 3.3µF 10 1 1 100 10 1000 100 Pulse Width (µs) 10000 Figure 5 Characteristic Graph Setting of Output Load Resistance (RNA51953B) High level output voltage can be set without depending on the power-supply voltage because the output terminal is an open collector type. However, please guard the following notes. 1. Please set it in value (2 V to 17 V) within the range of the power-supply voltage recommendation. Moreover, please never impress the voltage of maximum ratings 18 V or more even momentarily either. 2. Please set output load resistance (pull-up resistance) RL so that the output current (output inflow current IL) at L level may become 4 mA or less. Moreover, please never exceed absolute maximum rating (6 mA). VCC (2V to 17V) RL 6 IL ≤ 4mA Figure 6 Output Load Resistance RL Others 1. Notes when IC is handled are published in our reliability handbook, and please refer it. The reliability handbook can be downloaded from our homepage (following URL). http://www.renesas.com/fmwk.jsp?cnt=reliability_root.jsp&fp=/products/common_info/reliability 2. Additionally, please inquire of our company when there is an uncertain point on use. REJ03D0911-0100 Rev.1.00 Oct 10, 2008 Page 8 of 9 RNA51953A,B Package Dimensions JEITA Package Code P-SOP8-4.4x4.85-1.27 RENESAS Code PRSP0008DE-C *1 Previous Code — MASS[Typ.] 0.1g F D 8 NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET. 5 c *2 E HE bp Index mark Terminal cross section ( Ni/Pd/Au plating ) 1 Z Reference Symbol 4 e *3 bp x M A A2 L1 A1 θ L y Detail F REJ03D0911-0100 Rev.1.00 Oct 10, 2008 Page 9 of 9 D E A2 A1 A bp b1 c c1 θ HE e x y Z L L1 Dimension in Millimeters Min Nom Max 4.65 4.85 5.05 4.2 4.4 4.6 1.85 0.00 0.1 0.20 2.03 0.34 0.4 0.46 0.15 0.20 0.25 0° 8° 5.7 6.2 6.5 1.12 1.27 1.42 0.12 0.10 0.75 0.25 0.45 0.65 0.90 Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Notes: 1. This document is provided for reference purposes only so that Renesas customers may select the appropriate Renesas products for their use. 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