Preliminary Datasheet RNA51955A, B Voltage Detecting, System Resetting IC Series R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 Description RNA51955A,B are semiconductor integrated circuits for resetting of all types of logic circuits such as CPUs, and has the feature of setting the detection voltage by adding external resistance. They include a built-in delay circuit to provide a retardation time (200 s Typ). They fined extensive applications, including battery checking circuit, level detecting circuit and waveform shaping circuit. Features Few external parts Low threshold operating voltage (Supply voltage to keep low-state at low supply voltage): 0.6 V (Typ) at RL = 22 k Wide supply voltage range: 2 V to 17 V Wide application range Ordering Information Part Name RNA51955AFPH0 RNA51955APT0 RNA51955BFPH0 RNA51955BPT0 Package Type Package Code Package Abbreviation SOP-8 pin DIP-8 pin SOP-8 pin DIP-8 pin PRSP0008DE-C PRDP0008AF-B PRSP0008DE-C PRDP0008AF-B FP P FP P Taping Abbreviation (Quantity) H (2,500 pcs / Reel) T (1,000 pcs / Box) H (2,500 pcs / Reel) T (1,000 pcs / Box) Surface Treatment 0 (Ni/Pd/Au) 0 (Ni/Pd/Au) 0 (Ni/Pd/Au) 0 (Ni/Pd/Au) 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 R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 Page 1 of 11 RNA51955A, B Preliminary Outline and Article Indication • RNA51955A, B Part No. R955A YMWC CCC R955B YMWC CCC SOP-8 Lot No. Y: Year Code (the last digit of year) M: Month Code W: Week Code C: Control Code Trace Code Pin No.1 Part No. R5 1 9 5 5A R5 1 9 5 5B Y MW Y MW DIP-8 W: Week Code M: Month Code Y: Year Code Pin Arrangement RNA51955A, B NC 1 8 NC 7 Power-supply Input 2 NC 3 6 Output GND 4 5 NC (Top view) NC: No Connection Outline: PRSP0008DE-C (SOP-8) PRDP0008AF-B (DIP-8) R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 Page 2 of 11 RNA51955A, B Preliminary Block Diagram RNA51955A, B Powersupply A: Built-in Load B: Open Collector 25 μA Typ Output – Input – + C Delay capacitor 1.25 V GND Operating Waveform Output state Input voltage ∗ RNA51955A, B 1.25 V t H td L td ≈ 200 μs R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 td t Page 3 of 11 RNA51955A, B Preliminary Absolute Maximum Ratings (Ta = 25°C, unless otherwise noted) Item Supply voltage Output sink current Symbol VCC Isink Output voltage VO Power dissipation Pd Thermal derating K Operating temperature Storage temperature Topr Tstg Input voltage range VIN Ratings 18 6 VCC 18 400 570 4.4 8.3 –40 to +85 –55 to +125 –0.3 to VCC –0.3 to +7 Unit V mA Conditions Type A (output with constant current load) Type B (open collector output) 8-pin SOP (PRSP0008DE-C) 8-pin DIP (PRDP0008AF-B) 8-pin SOP (PRSP0008DE-C) Refer to the thermal derating curve. 8-pin DIP (PRDP0008AF-B) V mW mW/°C °C °C VCC 7 V VCC > 7 V V Electrical Characteristics (Ta = 25°C, unless otherwise noted) “L” reset type Symbol Min Typ Max Unit Detecting voltage Item VS 1.20 1.25 1.30 V Hysteresis voltage VS 9 15 23 mV Detecting voltage temperature coefficient VS/T — 0.01 — %/°C Supply voltage range VCC 2 — 17 V Input voltage range Vin –0.3 — VCC –0.3 — 7.0 Input current IIN — 100 500 — 390 590 — 360 540 V nA A Test Conditions VCC = 5V VCC 7V VCC > 7V VIN = 1.25V Type A, VCC = 5V Circuit current ICC Delay time tpd 80 200 500 s Output saturation voltage Vsat — 0.2 0.4 V L reset type, VCC = 5V, VIN < 1.2V, Isink = 4mA Threshold operating voltage VOPL — 0.67 0.8 — 0.55 0.7 V L reset type minimum supply voltage for IC operation Output leakage current IOH — — 30 nA Type B Type B, VCC = 5V Output load current IOC –40 –25 –17 A Type A, VCC = 5V, VO = 1/2 VCC Output high voltage VOH VCC–0.2 VCC–0.06 — V Type A R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 RL = 2.2k, Vsat 0.4V RL = 100k, Vsat 0.4V Page 4 of 11 RNA51955A, B Preliminary Typical Characteristics Thermal Derating Detection Voltage vs. Ambient Temperature 1.28 500 Detection Voltage VS (V) Power Dissipation Pd (mW) 600 8-pin DIP (PRDP0008AF-B) 400 300 8-pin SOP (PRSP0008DE-C) 200 100 0 0 25 50 75 85 100 1.27 VSH 1.26 1.24 1.23 1.22 –40 –20 125 Ambient Temperature Ta (°C) VSH 1.25 VSL 1.24 1.23 4 8 12 16 VCC = 5V 200 10V 150 VCC = 15V 100 50 60 80 100 Ambient Temperature Ta (°C) R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 VIN = 1.25 V Ta = –40°C 100 Ta = 25°C 50 Ta = 85°C 4 8 12 16 20 Threshold Operating Voltage 1.0 Output Voltage VOUT (V) Delay Time tpd (μs) 250 40 80 100 Supply Voltage VCC (V) 300 20 60 150 0 0 20 Delay Time vs. Ambient Temperature 350 0 40 200 Supply Voltage VCC (V) 0 –40 –20 20 Input Current vs. Supply Voltage 250 Input Current IIN (nA) Detection Voltage VS (V) 1.27 1.22 0 0 Ambient Temperature Ta (°C) Detection Voltage vs. Supply Voltage 1.28 1.26 VSL 1.25 Ta = 25°C 0.8 0.6 RL = 2.2 kΩ RL = 22 kΩ 0.4 RL = 100 kΩ 0.2 0 0 0.2 0.4 0.6 0.8 1.0 Supply Voltage VCC (V) Page 5 of 11 RNA51955A, B Preliminary Output Load Current vs. Output Voltage (RNA51955A) VCC = 4 V Output Load Current ICC (μA) Output Saturation Voltage Vsat (V) Output Saturation Voltage vs. Output Sink Current 0.3 0.2 0.1 0 0 1 2 3 4 5 6 Output Sink Current Isink (mA) –40 –30 –20 VCC = 5 V VCC = 10 V VCC = 15 V –10 0 0 4 8 12 16 Output Voltage VO (V) Circuit Current ICC (μA) Circuit Current vs. Supply Voltage (RNA51955B) 800 600 Ta = –40°C 400 Ta = 25°C Ta = 85°C 200 0 0 4 8 12 16 Supply Voltage VCC (V) R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 Page 6 of 11 RNA51955A, B Preliminary Example of Application Circuit Reset Circuit of RNA51955 Powersupply R1 RNA51955x R2 RL Output Input Powersupply VCC RESET Logic circuit GND GND Figure 1 Reset Circuit of RNA51955 Notes: 1. When the detecting supply voltage is 4.25 V, RNA51951 and RNA51953 are used. In this case, R1 and R2 are not necessary. When the voltage is anything except 4.25 V, RNA51955, RNA51957, and RNA51958 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. When the delay time is short, RNA51951 and RNA51955 are available. These ICs have a delay capacity and the delay time is about 200 s. If a longer delay time is necessary, RNA51953, RNA51957, and RNA51958 are used. In this case, the delay time is about 0.34 Cd (pF) s. 3. If the RNA5195xx 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, RNA51951, RNA51953, RNA51955, and RNA51957 are used and when the terminal is of the high reset type, RNA51958 are used. 6. When a negative supply voltage is used, the supply voltage side of RNA5195xx and the GND side are connected to negative supply voltage respectively. R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 Page 7 of 11 RNA51955A, B Preliminary 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 2. VCC + C1 C2 Power-supply R1 Example of ripple noise measures Input Vin Output RNA51955 R2 GND Figure 2 Example of Ripple Noise Measures 2. The sequence of voltage impression Please do not impress the voltages to the input terminals earlier than the power supply terminal. Moreover, please do not open the power supply terminal with the voltage impressed to the input terminal. (The setting of the bias of an internal circuit collapses, and a parasitic element might operate.) About the Input Terminal 1. Setting range of input voltage The following voltage is recommended to be input to the input terminal (pin 2). about 0.8 (V) < Vin < VCC – 0.3 (V) ... at VCC 7 V about 0.8 (V) < Vin < 6.7 (V) ............. at VCC > 7 V 2. About using input terminal Please do an enough verification to the transition characteristic etc. of the power supply when using independent power supply to input terminal (pin 2). VCC Vin is decided to the VCC subordinating, and operates in the range about 0.8 (V) < Vin < VCC – 0.3 (V). Output Power-supply Input RNA51955 Vin GND Figure 3 Recommended Example R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 Page 8 of 11 RNA51955A, B VCC1 Preliminary Independent VCC2 VCC Independent Power-supply Output Input Output Input RNA51955 Vin Power-supply RNA51955 Vin VCC GND GND GND Example 2. Logic pulse input (not recommended) Example 1. Independent power supply system Please do enough verifying about transition characteristic of VCC1 and VCC2. Figure 4 3. Calculation of detecting voltage Detecting voltage Vs can be calculated by the following expression. However, the error margin is caused in the detecting voltage because input current Iin (standard 100 nA) exists if it sets too big resistance. Please set the constant to disregard this error margin. R1 + R 2 VS = 1.25 × + Iin × R1 R2 error margin VCC Power-supply R1 Vin R2 Iin → Input Output RNA51955 GND Figure 5 Influence of Input Current 4. About the voltage input outside ratings Please do not input the voltage outside ratings to the input terminal. An internal protection diode becomes order bias, and a large current flows. R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 Page 9 of 11 RNA51955A, B Preliminary Setting of Output Load Resistance (RNA51955B) 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 (2 V to 17 V) RL 6 IL ≤ 4 mA 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/products/common_info/reliability/reliability_root.jsp 2. Additionally, please inquire of our company when there is an uncertain point on use. R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 Page 10 of 11 RNA51955A, B Preliminary 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 ) Reference Dimension in Millimeters Symbol 4 1 *3 e Z bp x M A A2 L1 A1 θ L y Detail F JEITA Package Code P-DIP8-6.3x9.6-2.54 RENESAS Code PRDP0008AF-B Previous Code DP-8FV D E A2 A1 A bp b1 c c1 θ HE e x y Z L L1 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 MASS[Typ.] 0.54g D 5 E 8 1 4 b3 0.89 A Z A1 Reference Dimension in Millimeters Symbol L Min e bp θ c e1 ( Ni/Pd/Au plating ) R03DS0004EJ0202 Rev.2.02 Apr 19, 2011 e1 D E A A1 bp b3 c θ e Z L Nom Max 7.62 9.60 10.6 6.30 7.4 5.06 0.5 0.40 0.48 0.56 1.30 0.19 0.25 0.31 15° 0° 2.29 2.54 2.79 1.27 2.54 Page 11 of 11 Notice 1. All information included in this document is current as of the date this document is issued. Such information, however, is subject to change without any prior notice. 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