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rej03d0774-0300 rev.3.00 sep 18, 2007 page 1 of 10 m51945a,b/m51946a,b voltage detecting, system resetting ic series rej03d0774-0300 rev.3.00 sep 18, 2007 description m51945a,b/m51946a,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 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 r l = 22 k ? ? wide supply voltage range: 2 v to 17 v ? wide application range application ? reset circuit of pch, nch, cmos, microcomputer, cpu an d 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 pin arrangement m51945afp/bfp m51946afp/bfp 8 5 6 7 nc nc nc: no connection output power-supply nc gnd nc input 1 4 3 2 (top view) outline: 5p5t (top view) m51945al/bl m51946al/bl output gnd power-supply 5 1 2 3 4 input nc outline: prsp0008de-c (recommend) prsp0008da-a (8p2s-a) (not recommend for new design)
m51945a,b/m51946a,b rej03d0774-0300 rev.3.00 sep 18, 2007 page 2 of 10 block diagram input ? + 1.25v 25a typ m51945a, b gnd output input + ? 1.25v 25a typ m51946a, b gnd power- supply output a: built-in load b: open collector power- supply a: built-in load b: open collecto r operating waveform 1.25v input voltage ? output state h l t t m51945a, b 1.25v input voltage ? output state h l t t m51946a, b
m51945a,b/m51946a,b rej03d0774-0300 rev.3.00 sep 18, 2007 page 3 of 10 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) 450 5-pin sip 400 8-pin sop (prsp0008de-c): recommend power dissipation pd 300 mw 8-pin sop (prsp0008da-a): not recommend 4.5 5-pin sip 4.4 8-pin sop (prsp0008de-c) : recommend thermal derating k 3 mw/c refer to the thermal derating curve. 8-pin sop (prsp0008da-a) : not recommend operating temperature topr ?30 to +85 c storage temperature tstg ?40 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 m51945a, m51945b ? ?h? reset type m51946a, m51946b 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 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 v v cc > 7v input current i in ? 100 500 na v in = 1.25v ? 310 470 type a , v cc = 5v circuit current i cc ? 280 420 a type b , v cc = 5v ? 0.2 0.4 l reset type, v cc = 5v, v in < 1.2v, isink = 4ma output saturation voltage vsat ? 0.2 0.4 v h reset type, v cc = 5v, v in > 1.35v, 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 t phl ? 4 ? response time when v cc changes h l propagation delay time t plh ? 2 ? s response time when v cc changes l h
m51945a,b/m51946a,b rej03d0774-0300 rev.3.00 sep 18, 2007 page 4 of 10 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 = 1.25v 0.3 0 02 1 3456 0.1 0.2 input current i in (na) supply voltage v cc (v) 1.0 0 0 0.2 0.4 0.6 0.8 1.0 0.2 0.4 0.6 0.8 supply voltage v cc (v) 0 4 8 12 16 20 ta = 25c r l = 2.2k? r l = 22k? r l = 100k? supply voltage v cc (v) 048121620 detecting voltage v s (v) v sh v sl ta = ?30c ta = 85c ta = 25c detection voltage vs. ambient temperature (input voltage detection series) detection voltage vs. supply voltage (input voltage detection series) input current vs. supply voltage (input voltage detection series) ambient temperature ta (c) detecting voltage v s (v) threshold operating voltage ([l] reset type) output voltage v out (v) output saturation voltage vs. output sink current output sink current isink (ma) output saturation voltage vsat (v) supply voltage detecting "l" reset type : v cc = 4v except above mentioned : v cc = 5v 5-pin sip 500 0 0255075 85 100 125 100 200 300 400 thermal derating (maximum rating) ambient temperature ta (c) power dissipation pd (mw) 8-pin sop (prsp0008de-c) : recommend 8-pin sop (prsp0008da-a) : not recommend
m51945a,b/m51946a,b rej03d0774-0300 rev.3.00 sep 18, 2007 page 5 of 10 circuit current vs. supply voltage (m51945b, m51946b) supply voltage v cc (v) circuit current i cc ( a) 0 0481216 200 400 600 800 ta = ?30c ta = 25c ta = 85c example of application circuit reset circuit of m5194xx series power- supply power- supply output r l v cc cd r 1 r 2 m5194xx reset (reset ) logic circuit input gnd gnd figure 1 reset circuit of m5194xx series notes: 1. when the detecting supply voltage is 4.25 v, m51943 and m51944 are used and r 1 and r 2 are not necessary. when the voltage is anything except 4.25 v, m51945 and m51946 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. if the m5194xx 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. 3. 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. 4. it is better to use the m5195xx series to cause a delay, but if the delay is caused by the m5194xx series, the delay capacitor cd is applied between the output and gnd. 5. when the reset terminal in the logic circuit is of the low reset type, m51943 and m51945 are used and when the terminal is of the high reset type, m51944 and m51946 are used. 6. when a delay is necessary at both rise time and fall time, m51945 and m51946 are used and the series resistors (r 11 , r 12 ) are applied between the output and gnd or instead of r 1 , and these connect the capacitor between the connection point and gnd. the connection poi nt of the capacitor is fi xed according to the ratio of delay at fall/rise time. 7. when a negative supply voltage is used, the supply voltage side of m5194xx and the gnd side are connected to gnd and the negative supply voltage respectively.
m51945a,b/m51946a,b rej03d0774-0300 rev.3.00 sep 18, 2007 page 6 of 10 notice for use about the power supply line 1. about bypass capacitor because the ripple and the spike of the high frequency nois e 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 m51945 m51946 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 characteristic etc. of the power supply when using independent power supply to input terminal (pin 2). power-supply output vin m51945 m51946 input gnd vin is decided to the v cc subordinating, and operates in the range about 0.8 (v) < vin < v cc ? 0.3 (v). v cc figure 3 recommended example
m51945a,b/m51946a,b rej03d0774-0300 rev.3.00 sep 18, 2007 page 7 of 10 power-supply output vin m51945 m51946 input gnd v cc 1 v cc 2 independent example 1. independent power supply system please do enough verifying about transition characteristic of v cc 1 and v cc 2. independent power-supply output m51945 m51946 input gnd v cc vin gnd v cc 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 m51945 m51946 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.
m51945a,b/m51946a,b rej03d0774-0300 rev.3.00 sep 18, 2007 page 8 of 10 setting of output load resistance (m51945b/m51946b) 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) 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 downloaded from our homepage (following url). http://www.renesas.com/fmwk.jsp?cnt=reliab ility_root.jsp&fp=/products/common_info/reliability 2. additionally, please inquire of our company when there is an uncertain point on use.
m51945a,b/m51946a,b rej03d0774-0300 rev.3.00 sep 18, 2007 page 9 of 10 package dimensions sip5-p-240-2.54 weight(g) ? jedec code eiaj package code lead material cu alloy 0.22 5p5t plastic 5pin 240mil sip ? ? ? ? ? 4.0 ? 11.9 11.5 symbol min nom max a a 2 b 1 b b 2 c d e e 1 l dimension in millimeters a 1 3.0 2.54 0.8 0.7 0.6 2.17 1.97 1.77 11.7 0.34 0.27 0.22 1.15 0.85 0.75 1.5 1.2 1.1 0.6 0.5 0.4 1.4 6.1 e ? ? ? ? d e a 2 a 1 a l e 1 c b 2 b 1 b e seating plane 1 5 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
m51945a,b/m51946a,b rej03d0774-0300 rev.3.00 sep 18, 2007 page 10 of 10 2. 1. dimensions "*1" and "*2" do not include mold flash. note) dimension "*3" does not include trim offset. b p a 1 h e y 0.1 e 1.27 c 0 10 l 0.2 0.4 0.6 0.05 a 1.9 5.9 6.2 6.5 a 2 1.5 e 4.2 4.4 4.6 d 4.8 5.0 5.2 reference symbol dimension in millimeters min nom max 0.35 0.4 0.5 0.13 0.15 0.2 p-sop8-4.4x5-1.27 0.07g mass[typ.] 8p2s-a prsp0008da-a renesas code jeita package code previous code 1.12 1.42 detail f l a 1 a 2 f *1 *2 *3 85 4 1 index mark y b p e a c e h e d
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