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r03ds0004ej0202 rev.2.02 page 1 of 11 apr 19, 2011 preliminary datasheet RNA51955A, b voltage detecting, system resetting ic series 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 package type package code package abbreviation taping abbreviation (quantity) surface treatment RNA51955Afph0 sop-8 pin prsp0008de-c fp h (2,500 pcs / reel) 0 (ni/pd/au) RNA51955Apt0 dip-8 pin prdp0008af-b p t (1,000 pcs / box) 0 (ni/pd/au) rna51955bfph0 sop-8 pin prsp0008de-c fp h (2,500 pcs / reel) 0 (ni/pd/au) rna51955bpt0 dip-8 pin prdp0008af-b p t (1,000 pcs / box) 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, leve l detecting circuit, waveform shapin g 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
RNA51955A, b preliminary r03ds0004ej0202 rev.2.02 page 2 of 11 apr 19, 2011 outline and article indication trace code ? RNA51955A, b pin no.1 y: year code (the last digit of year) m: month code w: week code c: control code lot no. part no. r 9 5 5 a ymwc ccc sop-8 dip-8 r 9 5 5 b ymwc ccc part no. 55 19 5b r 55 19 5a r y: year code m: month code w: week code y m wy m w pin arrangement nc: no connection RNA51955A, b 8 5 6 7 nc nc output power-supply nc gnd nc input 1 4 3 2 (top view) outline: prsp0008de-c (sop-8) prdp0008af-b (dip-8)
RNA51955A, b preliminary r03ds0004ej0202 rev.2.02 page 3 of 11 apr 19, 2011 block diagram 25 a typ 1.25 v gnd output input ? + ? a: built-in load b: open collector c delay capacitor RNA51955A, b power- supply operating waveform RNA51955A, b 1.25 v input voltage ? output state h l t t td 200 s td td
RNA51955A, b preliminary r03ds0004ej0202 rev.2.02 page 4 of 11 apr 19, 2011 absolute maximum ratings (ta = 25c, unless otherwise noted) item symbol ratings unit conditions supply voltage v cc 18 v output sink current isink 6 ma v cc type a (output with constant current load) output voltage v o 18 v type b (open collector output) 400 8-pin sop (prsp0008de-c) power dissipation pd 570 mw 8-pin dip (prdp0008af-b) 4.4 8-pin sop (prsp0008de-c) thermal derating k ? 8.3 mw/c 8-pin dip (prdp0008af-b) refer to the thermal derating curve. operating temperature topr ?40 to +85 c storage temperature tstg ?55 to +125 c ?0.3 to v cc v cc ? 7 v input voltage range v in ?0.3 to +7 v v cc > 7 v electrical characteristics (ta = 25c, unless otherwise noted) ? ?l? reset type item symbol min typ max unit test conditions detecting voltage v s 1.20 1.25 1.30 v hysteresis voltage ? v s 9 15 23 mv v cc = 5v detecting voltage temperature coefficient v s /? t ? 0.01 ? %/c supply voltage range v cc 2 ? 17 v ?0.3 ? v cc v cc ? 7v input voltage range vin ?0.3 ? 7.0 v v cc > 7v input current i in ? 100 500 na v in = 1.25v ? 390 590 type a , v cc = 5v circuit current i cc ? 360 540 ? a type b , v cc = 5v delay time t pd 80 200 500 ? s output saturation voltage vsat ? 0.2 0.4 v l reset type, v cc = 5v, v in < 1.2v, isink = 4ma ? 0.67 0.8 r l = 2.2k ? , vsat ? 0.4v threshold operating voltage v opl ? 0.55 0.7 v l reset type minimum supply voltage for ic operation r l = 100k ? , vsat ? 0.4v output leakage current i oh ? ? 30 na type b output load current i oc ?40 ?25 ?17 ? a type a , v cc = 5v, v o = 1/2 ? v cc output high voltage v oh v cc ?0.2 v cc ?0.06 ? v type a
RNA51955A, b preliminary r03ds0004ej0202 rev.2.02 page 5 of 11 apr 19, 2011 typical characteristics 250 0 50 100 150 200 1.28 1.22 ?40 0?20 20 40 8060 100 1.23 1.24 1.25 1.26 1.27 1.28 1.22 1.23 1.24 1.25 1.26 1.27 v sh v sl v in = 1.25 v 0 4 8 12 16 20 0 4 8 12 16 20 v sh v sl ta = ?40c ta = 85c ta = 25c supply voltage v cc (v) supply voltage v cc (v) input current i in (na) detection voltage v s (v) detection voltage vs. ambient temperature detection voltage vs. supply voltage input current vs. supply voltage ambient temperature ta (c) detection voltage v s (v) 600 500 0 0255075 85 100 125 100 200 300 400 thermal derating ambient temperature ta (c) power dissipation pd (mw) 8-pin sop (prsp0008de-c) 8-pin dip (prdp0008af-b) 1.0 0 0 0.2 0.4 0.6 0.8 1.0 0.2 0.4 0.6 0.8 ta = 25c r l = 2.2 k r l = 22 k r l = 100 k supply voltage v cc (v) threshold operating voltage output voltage v out (v) ambient temperature ta (c) ?40 0 ?20 20 40 8060 100 delay time t pd (s) 350 0 150 100 50 250 200 300 delay time vs. ambient temperature v cc = 5v 10v v cc = 15v
RNA51955A, b preliminary r03ds0004ej0202 rev.2.02 page 6 of 11 apr 19, 2011 0.3 0 02 1 3456 0.1 0.2 v cc = 5 v v cc = 4 v v cc = 15 v v cc = 10 v 0 0 4 8 12 16 ?10 ?20 ?30 ?40 0 0481216 200 400 600 800 ta = ?40c ta = 25c ta = 85c supply voltage v cc (v) output load current vs. output voltage (RNA51955A) output voltage v o (v) output load current i cc (a) circuit current vs. supply voltage (rna51955b) circuit current i cc (a) output sink current isink (ma) output saturation voltage vsat (v) output saturation voltage vs. output sink current
RNA51955A, b preliminary r03ds0004ej0202 rev.2.02 page 7 of 11 apr 19, 2011 example of application circuit reset circuit of rna51955 r l v cc r 1 r 2 rna51955x reset logic circuit input gnd gnd power- supply power- supply output 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, r 1 and r 2 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 ? (r 1 +r 2 )/r 2 (v) approximately. the detecting supply voltage can be set between 2 v and 15 v. 2. when the delay time is short, rna51951 and rna5 1955 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 comm on 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 r l 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 suppl y voltage respectively.
RNA51955A, b preliminary r03ds0004ej0202 rev.2.02 page 8 of 11 apr 19, 2011 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 c 1 and c 2 for the low frequency and for the high frequency between the power supply line and the gnd line as shown in following figure 2. power-supply output r 1 v cc r 2 vin rna51955 input gnd c 2 c 1 + example of ripple noise measures 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 < v cc ? 0.3 (v) ... at v cc ? 7 v about 0.8 (v) < vin < 6.7 (v) ............. at v cc > 7 v 2. about using input terminal please do an enough verification to the transition character istic etc. of the power supply when using independent power supply to input terminal (pin 2). power-supply output vin rna51955 input gnd v cc vin is decided to the v cc subordinating, and operates in the range about 0.8 (v) < vin < v cc ? 0.3 (v). figure 3 recommended example
RNA51955A, b preliminary r03ds0004ej0202 rev.2.02 page 9 of 11 apr 19, 2011 power-supply output vin rna51955 rna51955 input gnd v cc 1 v cc 2 independent independent power-supply output input gnd v cc vin gnd v cc example 1. independent power supply system please do enough verifying about transition characteristic of v cc 1 and v cc 2. example 2. logic pulse input (not recommended) 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. v s = 1.25 + iin r 1 error margin r 1 + r 2 r 2 power-supply output vin iin rna51955 gnd input v cc r 1 r 2 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.
RNA51955A, b preliminary r03ds0004ej0202 rev.2.02 page 10 of 11 apr 19, 2011 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 th e 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 resi stance (pull-up resistance) r l so that the output current (output inflow current i l ) at l level may become 4 ma or less. moreover, pleas e never exceed absolute maximum rating (6 ma). v cc (2 v to 17 v) i l 4 ma 6 r l figure 6 output load resistance r l 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/comm on_info/reliability/reliability_root.jsp 2. additionally, please inquire of our company when there is an uncertain point on use.
RNA51955A, b preliminary r03ds0004ej0202 rev.2.02 page 11 of 11 apr 19, 2011 package dimensions a l e c 1 b 1 d e a 2 b p c x y h e z l 1 4.854.65 0.90 0.12 0 8 6.2 0.15 0.20 0.25 1.12 1.42 0.46 0.00 0.1 0.20 4.4 1.85 4.6 4.2 0.25 0.45 0.65 2.03 reference symbol dimension in millimeters min nom max 5.05 a 1 0.34 0.4 6.5 5.7 1.27 0.10 0.75 5 8 4 f *1 *2 *3 p mx y 1 index mark e a z b e h d p terminal cross section ( ni/pd/au plating ) c b 1 detail f a 2 a note) 1. dimensions"*1 (nom)"and"*2" do not include mold flash. 2. dimension"*3"does not include trim offset. e p-sop8-4.4x4.85-1.27 0.1g mass[typ.] ? prsp0008de-c renesas code jeita package code previous code 1 l l ( ni/pd/au plating ) 5 8 4 1 3 1 p 1 e d e b b a la e z c 0.89 2.54 1.27 0.480.40 7.4 10.6 15 0 2.792.542.29 0.31 0.250.19 1.30 0.56 0.5 e 1 l e c b p a e d b 3 z a 1 5.06 6.30 9.60 reference symbol dimension in millimeters min nom max 7.62 p-dip8-6.3x9.6-2.54 0.54g mass[typ.] dp-8fv prdp0008af-b renesas code jeita package code previous code
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