rej03d0911-0100 rev.1.00 oct 10, 2008 page 1 of 9 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 s upply 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 checki ng circuit, level detecting circuit and waveform shaping circuit. features ? few external parts ? large delay time with a capac itor of small capacitance (td 100 ms, at 0.33 f) ? low threshold operating voltage (supply voltage to keep low-state at low supply voltage): 0.6 v (typ) at r l = 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 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) 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 y : year code (the last digit of year) m : month code w : week code c : control code lot no. trace code pin no.1 sop-8 r 9 5 3 b ymwc ccc type no. r 9 5 3 a ymwc ccc
RNA51953A,b rej03d0911-0100 rev.1.00 oct 10, 2008 page 2 of 9 pin arrangement RNA51953Afp/bfp 8 5 6 7 nc delay capacito r nc: no connection output power-supply nc gnd nc nc 1 4 3 2 (top view) outline: prsp0008de-c block diagram gnd output delay capacitor ? + ? 1.25v r1 r2 25 a typ 5 a typ a: built-in load b: open collector RNA51953A, b power- supply operating waveform RNA51953A, b output undefined 4.25v 0.65v supply voltage output state h l t t td 0.34 cd(pf) s td td
RNA51953A,b rej03d0911-0100 rev.1.00 oct 10, 2008 page 3 of 9 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) power dissipation pd 400 mw 8-pin sop (prsp0008de-c) thermal derating k 4.4 mw/c refer to the thermal derating curve. 8-pin sop (prsp0008de-c) operating temperature topr ?40 to +85 c storage temperature tstg ?55 to +125 c electrical characteristics (ta = 25c, unless otherwise noted) ? ?l? reset type item symbol min typ max unit test conditions detecting voltage v s 4.05 4.25 4.45 v hysteresis voltage ? v s 30 50 80 mv detecting voltage temperature coefficient v s / ? t ? 0.01 ? %/c ? 450 680 type a , v cc = 5v circuit current i cc ? 420 630 a type b , v cc = 5v delay time t pd 1.6 3.4 7.0 ms cd = 0.01 f * constant current ipd ?8 ?5 ?3 a v cc = 5v output saturation voltage vsat ? 0.2 0.4 v v cc = 4v, isink = 4ma ? 0.67 0.8 r l = 2.2k ? , vsat 0.4v threshold operating voltage v opl ? 0.55 0.7 v 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 note: please set the desired delay time by atta ching capacitor of t he range between 4700 pf and 10 f.
RNA51953A,b rej03d0911-0100 rev.1.00 oct 10, 2008 page 4 of 9 typical characteristics ambient temperature ta (c) 4.34 4.22 ?40 0 ?20 20 40 80 60 100 4.24 4.26 4.28 4.30 4.32 v sh v sl delay time t pd (ms) 0.1 3 5 7 3 5 7 357 110 7 3 5 100 1000 ambient temperature ta (c) ?40 0 ?20 20 40 80 60 100 canstant current at cd pin ipd ( a) ?12 0 ?4 ?8 ?6 ?2 ?10 v cc = 5v v cc = 15v supply voltage v cc (v) output voltage v out (v) 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 = 2.2k ? r l = 22k ? r l = 100k ? delay capacitance cd ( f) 10 7 5 3 7 5 3 7 5 3 7 5 3 0.001 0.1 0.01 1 v cc = 5v ambient temperature ta (c) ?40 0 ?20 20 40 80 60 100 delay time t pd (ms) 6 0 3 2 1 5 4 v cc = 5v 10v v cc = 15v c d = 0.01 f detection voltage v s (v) detection voltage vs. ambient temperature threshold operating voltage delay capacitance vs. delay time delay time vs. ambient temperature canstant current at cd pin vs. ambient temperature 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)
RNA51953A,b rej03d0911-0100 rev.1.00 oct 10, 2008 page 5 of 9 output sink current isink (ma) output saturation voltage vsat (v) 0.3 0 02 1 3456 0.1 0.2 v cc = 5v v cc = 15v v cc = 10v output load current vs. output voltage (RNA51953A) output voltage v o (v) output load current i cc ( a) 0 0 4 8 12 16 ?10 ?20 ?30 ?40 ambient temperature ta (c) ?40 0 ?20 20 40 80 60 100 v cc = 5v circuit current vs. ambient temperature (rna51953b) circuit current i cc ( a) 700 0 300 200 100 500 400 600 output saturation voltage vs. output sink current v cc = 4v
RNA51953A,b rej03d0911-0100 rev.1.00 oct 10, 2008 page 6 of 9 example of application circuit reset circuit of rna51953 r l v cc rna51953x reset logic circuit gnd delay capacitor gnd cd power- supply power- supply output 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 (r 1 +r 2 )/r 2 (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) s. 3. if the rna51953 and the logic circuit share a common pow er 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, 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 out put r l v cc rna51953x rna51953x (a) reset at on reset logic circuit out put gnd delay capacitor gnd cd r l v cc (b) reset at transistor on reset logic circuit gnd delay capacitor gnd cd control signal power- supply power- supply power- supply power- supply figure 2 case of using reset signal except supply voltage in the rna51953
RNA51953A,b rej03d0911-0100 rev.1.00 oct 10, 2008 page 7 of 9 notice for use about the power supply line 1. about bypass capacitor because the ripple and the spike of th e high frequency noise and the low freque ncy 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 3. power-supply output v cc rna51953 gnd c 2 c 1 + delay capacito r cd example of ripple noise measures figure 3 example of ripple noise measures setting of delay capacity please use capacitor cd for the delay within the range of 10 f or less . when a value that is bigger than this is set, the problem such as following (1), (2), and (3) becomes remarkable. t v cc output tpd t phl 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 f. 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 t phl is 10 s when delay capacitor cd = 0.1 f. the momentary voltage-decrease that is longer than such t phl are occurs, the detection b ecomes possible. when the delay capacitance is enlarged, t phl also becomes long. for instance, it becomes about 100 to 200 s in case of circuit constant c1 = 100 f. (characteristic graph 1 is used and extrapolation in case of cd = 100 f.) therefore, it doesn't react to momentary vo ltage-decrease that is shorter than this. (3) original delay time is not obtained. when the momentary voltage-decrease time ?t? is equivalent to t phl , 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)
RNA51953A,b rej03d0911-0100 rev.1.00 oct 10, 2008 page 8 of 9 0.01 0.1 1 delay capacitance cd ( f) 10 100 1000 1 10 100 200 1 10 100 pulse width ( s) characteristic graph 2 delay time vs. momentary voltage decrease pulse width (example data) characteristic graph 1 reaction time vs. delay capacitance (example data) delay time tpd (ms) reaction time t phl ( s) 1000 10000 10000 1000 100 10 1 0.01 f delay capacitance 0.033 f 0.1 f 0.33 f 1 f 2.2 f 3.3 f figure 5 characteristic graph setting of output load resistance (rna51953b) high level output voltage can be set w ithout depending on the power-s upply 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 maximu m 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 (2v to 17v) i l 4ma 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 downloade d from our homepage (following url). http://www.renesas.com/fmwk.jsp ?cnt=reliability_root.jsp&fp=/p roducts/common_info/reliability 2. additionally, please inquire of our company when there is an uncertain point on use.
RNA51953A,b rej03d0911-0100 rev.1.00 oct 10, 2008 page 9 of 9 package dimensions a l e c 1 b 1 d e a 2 b p c x y h e z l 1 4.85 4.65 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 m x 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
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