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M62050P/FP
3 V Supply System Reset with Watchdog Timer
REJ03D0786-0200 Rev.2.00 Jun 15, 2007
Description
The M62050P/FP is a voltage threshold detector designed for detection of 3 V supply voltage and generation of a system reset pulse. It is suitable for microcontroller systems. The IC, a supervisor of the MCU operations, dissipates low current of 0.6 mA (Typ) during normal operations of the MCU systems. It has two selectable threshold voltages, which allows applying it to a high precision system design.
Features
* * * * Watchdog timer (supervisor for two system voltages) Power-on reset timer Low current consumption: 0.6 mA (Typ, VCC = 3 V) Wide supply voltage range: VCC(max) = 7 V
Application
* Supervisor for microcontroller systems
Recommended Operating Condition
* Recommended supply voltage: 3 V
Block Diagram
- +
S
+ -
RQ
+ -
- +
- +
RQ
S
S
RQ
1 WD
2 TC
3 RST1
4 GND
5 Ct1
6 VCC
7 RST2
8 ADJ
REJ03D0786-0200 Rev.2.00 Jun 15, 2007 Page 1 of 11
M62050P/FP
Pin Arrangement
M62050P M62050FP WD 1 TC 2 RST1 3 GND 4 (Top view) Outline: PRDP0008AA-A (8P4) [P] PRSP0008DE-C [FP] (recommend) PRSP0008DA-A (8P2S-A) [FP] (not recommend for new design) 8 ADJ 7 RST2 6 VCC 5 Ct1
Pin Description
Pin No. 1 2 3 4 5 6 7 8 Symbol WD TC RST1 GND Ct1 VCC RST2 ADJ Functional Description Input for watchdog timer Time set for reset timer and watchdog timer Pin that outputs reset signal when abnormal signal is input to WD pin GND Capacitor installation pin for delay time setting Power supply Pin that outputs reset signal when power supply voltage becomes abnormal Selection between two detection voltages
Absolute Maximum Ratings
(Ta = 25C, unless otherwise noted)
Item Supply voltage Input voltage Output voltage Output current Power dissipation Thermal derating Operating temperature Storage temperature Symbol VCC VIN VOUT IOUT Pd K Topr Tstg Rating 7 -0.3 to +7 15 10 625 440 6.25 4.4 -20 to +75 -55 to +125 Unit V V V mA mW mW/C C C 8-pin DIP 8-pin SOP Ta 25C 8-pin DIP 8-pin SOP Conditions
REJ03D0786-0200 Rev.2.00 Jun 15, 2007 Page 2 of 11
M62050P/FP
Electrical Characteristics
(Ta = -25C, VCC = 3 V, unless otherwise noted) DC Characteristics
Test Conditions Item WD input current WD input voltage TC output current TC input current Watchdog timer threshold voltage Output voltage Output leakage current VCC detection voltage (1) Symbol IWD VIH VIL IOUT IIN VTH3(H) VTH3(L) VOL Ileak VTH1(H) VTH1(L) VTH1 VTH2(H) VTH2(L) VTH2 VTH4(H) VTH4(L) VTH4 RST1 RST2 ICC Min 60 1.5 -0.3 -- -- -- -- -- -- 2.13 2.10 30 2.43 2.40 30 2.23 2.20 30 -- -- -- Typ 140 -- -- -- 2.5 2.4 1.2 0.2 -- 2.25 2.20 50 2.55 2.50 50 2.35 2.30 50 -- -- 600 Max 250 3.0 0.8 -1 3.5 -- -- 0.5 5.0 2.42 2.30 120 2.72 2.60 120 2.52 2.40 120 0.5 0.5 950 Unit A V A mA V V A V mV V mV V mV V V A Pin WD WD TC TC TC RST1 RST2 VCC(1) VIN = 3V
VIN = 1.0V VOUT = 2.6V
VCC detection voltage (2)
VCC(2)
VCC detection voltage (4)
VCC(4)
RST1 ON voltage RST2 ON voltage Circuit current
RST1 RST2 VCC
IOUT = 1mA VOUT = 3V VCCLH VCCHL VTH1 = VTH1(H) - VTH1(L) VCCLH VCCHL VTH2 = VTH2(H) - VTH2(L) VCCLH VCCHL VTH4 = VTH4(H) - VTH4(L) VCC = 1.2V, RL = 4.7k VCC = 1.2V, RL = 4.7k
AC Characteristics
Test Conditions Typ Max C x 1.1 x R1 0.5 1.1 1.7 Reset timer (1) tRST(1) C x 0.5 x R1 0.2 0.5 1.1 Reset timer (2) tRST(2) 830 x C 40 83 220 3 Reset timer delay time tdRST(1) 290 x 10 x Cd * 140 290 790 Input pulse width tWDIN 3 -- -- Propagation delay td1 -- 4 -- -- 2 -- td2 Note: * Cd: Delay capacitor connected with Ct1 pin Item Watchdog timer Symbol tWD Min Unit s ms s ms s s s s s s Pin RST1 C = 0.1F, R1 = 10k RST1 C = 0.1F, R1 = 10k RST1 C = 0.1F, R1 = 10k RST1 Cd = 0.001F WD RST1 RST2
REJ03D0786-0200 Rev.2.00 Jun 15, 2007 Page 3 of 11
M62050P/FP
Operating Description
Timing Chart 1 (When the delay capacitor is not connected with Ct1 pin)
VTH2(H) VTH1(H) VTH2(L) VTH1(L)
VTH1
VCC 0V
VTH3(H) VTH3(L)
TC
0V
WD 0V
Power ON reset timer
RST1 0V
RST2 0V
tRST(1) tWD tRST(2)
(1)(2)(3)
(4)
(5)
(6)
(7) (8)
(9)
(10) (11)
(1): The VCC rises up to 0.8 V, then RST1 and RST2 generates low output, and rising up to 2.2 V(VTH1(H)), charge of C1 begins. (2): The VCC rises up to 2.5 V(VTH2(H)), then RST2 generates high. (3), (4): The voltage at TC pin is 1.2 V(VTH3(L) = 2/5 VCC), then RST2 generates high, when 2.4 V(VTH3(H) = 4/5 VCC), C1 is discharged and RST1 generates low. (5): The voltage at TC pin falls to 1.2 V, then RST1 generates high unless normal clock signal is entered to WD pin, RST1 repeats this operation. (6), (7): Before the voltage at TC pin reaches 4 V, if normal clock signal is entered to WD pin, low RST1 is canceled. (8), (9): In the case of entrance of abnormal signal input, as the waveform of TC pin repeats charge and discharge of RST1 alternatively, the RST1 repeats high and low output operation. (10): The VCC falls to 2.5 V(VTH2(L)), then RST2 generates low, this detective voltage has a 50 mV hysteresis. (11): When VCC goes down to 2.2 V(VTH1(L)), the status of TC pin is switched to discharge. When the potentional at TC pin is detected being VTH3(H) or VTH3(L), the status of RST1 becomes "low". (This detective voltage has a 50 mV hysteresis.) Terminology tRST(1) : Time required for TC pin potential to rise from 0 V VTH3(L) when VCC is being applied. tWD : Time required for TC pin potential to rise from VTH3(L) to VTH3(H). tRST(2) : Time required for TC pin potential to go down from VTH3(H) to VTH3(L). tdRST(1) : Time required for delay of charge with TC pin when VCC is impressed by connecting capacitor with Ct1 pin between GND.
Figure 1 Timing Chart 1
REJ03D0786-0200 Rev.2.00 Jun 15, 2007 Page 4 of 11
M62050P/FP Timing Chart 2 (When the delay capacitor is connected with Ct1 pin)
VTH1(H)
VCC 0V
VTH3(H) VTH3(L)
TC
0V
WD 0V
Power ON reset timer
RST1 0V
tdRST(1)
(1)
(2)
The following delay time will enter by the time the charge of TC pin starts when the capacitor Cd is connected with Ct1 pin. tdRST(1) = 290 x 103 x Cd
Figure 2 Timing Chart 2
REJ03D0786-0200 Rev.2.00 Jun 15, 2007 Page 5 of 11
M62050P/FP 1. Pin(2) (TC pin) charge time and discharge time When input to WD pin is abnormal, TC pin output waveform is as shown below:
4 V CC 5 TC 0V
tWD tRST(1) tRST(2)
2 V CC 5 Please set it within the range of 10k R1 30k.
tRST(1) = 0.51 C R1 tWD = 1.1 C R1 (charge time) R1 + 1 1000 tRST(2) = 1000 C ln 2 V R1 CC 1000 5 4 VCC - VCC 5 (discharge time) - VCC - 2 VCC 5 2
VCC R1
C
Figure 3 Please set the time of tWD and tRST(2) within the following range. 110 s tWD 1.1 s 8.3 s tRST(2) 83 ms
2. Pin (1) (WD pin) input frequency, input pulse width, charge time and discharge time When input to WD pin is normal, TC pin output waveform is as shown below:
(VCC = 3V) 2.4V (= 4 VCC) 5 1.2V (= 2 VCC) 5
t1 t2
Pin (2)
xV
Input
tWDIN
t1 = C R1 ln
VCC - 2 VCC 5 VCC - x R1 + 1) x - VCC 1000 2 V R1 - (V - 2 V ) CC 5 CC 1000 5 CC (
(charge time)
t2 = 1000 C ln
(discharge time)
Figure 4
REJ03D0786-0200 Rev.2.00 Jun 15, 2007 Page 6 of 11
M62050P/FP * Pin (1) (WD pin) input requirements (1) Input cycle: tWD or less (discharge should start before voltage at WD pin reaches 2.4 V.)
1 (2) Input pulse width tWDIN: t2 or less
C = 104 1ms t C = 103 100s VCC = 3V
t1
R1 = 10k 50s 0.5 ms
t2
1.2
1.7
2.4
Discharge Voltage x(V)
Figure 5 3. VCC detection voltage adjustment The detection voltage 2 (VTH2) can be set as shown in Table 1 by connecting ADJ pin with opening or VCC. Table 1 Detection Voltage 2 (ADJ pin)
at Opening (V) 2.55 2.50 at VCC (V) 2.35 2.30
Detection Voltage 2 VTH2(H) VTH2(L)
6 6.5k 8 35.2k
+ -
RL 7
40k 1.25V 4
Figure 6
REJ03D0786-0200 Rev.2.00 Jun 15, 2007 Page 7 of 11
M62050P/FP
Application Example
M62050
1
2
3
4
5
6
7
8
Clock
RST1 (RESET) MCU/MPU
RST2 (HOLD) VDD
Figure 7 Application Example
REJ03D0786-0200 Rev.2.00 Jun 15, 2007 Page 8 of 11
M62050P/FP
Typical Characteristics
Detection Voltage vs. Ambient Temperature 2.6 V (8 pin = open)
TH2
Detection Voltage VTH (V)
2.5 2.4 2.3 2.2 2.1 2.0 -50 -25
VTH4 (8 pin = VCC) VTH1 (8 pin = open)
(H) (L)
(H) (L) (H) (L)
0
25
50
75 100 125
Ambient Temperature Ta (C)
Circuit Current vs. Supply Voltage 3
Circuit Current ICC (mA)
Ta = 25C Ta = 125C Ta = -40C
2
1
0 0
1
2
3
4
5
6
7
Supply Voltage VCC (V)
REJ03D0786-0200 Rev.2.00 Jun 15, 2007 Page 9 of 11
M62050P/FP
Package Dimensions
JEITA Package Code P-DIP8-6.3x8.84-2.54 RENESAS Code PRDP0008AA-A Previous Code 8P4 MASS[Typ.] 0.5g
8
5
c
1
4
*1
e1
E
*2 D
NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET.
A
Reference Symbol
A2
Dimension in Millimeters
SEATING PLANE *3 b 3 bp e *3 b 2
e1 D E A A1 A2 bp b2 b3 c e L
Min Nom Max 7.32 7.62 7.92 8.7 8.9 9.1 6.15 6.3 6.45 4.5 0.51 3.3 0.4 0.5 0.6 0.9 1.0 1.3 1.4 1.5 1.8 0.22 0.27 0.34 15 0 2.29 2.54 2.79 3.0
JEITA Package Code P-SOP8-4.4x4.85-1.27
L
RENESAS Code PRSP0008DE-C
Previous Code --
A1
MASS[Typ.] 0.1g
*1
D
F
8
5
NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET.
bp
HE E
*2
Index mark
Terminal cross section ( Ni/Pd/Au plating )
1 Z e 4
*3
c
Reference Symbol
Dimension in Millimeters
bp
x
M L1
A1
L
y
Detail F
D E A2 A1 A bp b1 c c1 HE e x y Z L L1
A
A2
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
REJ03D0786-0200 Rev.2.00 Jun 15, 2007 Page 10 of 11
M62050P/FP
JEITA Package Code P-SOP8-4.4x5-1.27 RENESAS Code PRSP0008DA-A Previous Code 8P2S-A MASS[Typ.] 0.07g
8
5
HE
*1
E
F
1
Index mark
4
NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET.
c
A2 A1
*2
D
Reference Symbol
Dimension in Millimeters
*3 e y
bp
D E A2 A1 A bp c HE e y L
Detail F
Min Nom Max 4.8 5.0 5.2 4.2 4.4 4.6 1.5 0.05 1.9 0.35 0.4 0.5 0.13 0.15 0.2 0 10 5.9 6.2 6.5 1.12 1.27 1.42 0.1 0.2 0.4 0.6
A
REJ03D0786-0200 Rev.2.00 Jun 15, 2007 Page 11 of 11
L
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