R5108G

R5108G RICOH | Alldatasheet

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Technical content

Microprocessor Supervisory Circuit R5108G SERIES NO. EA-171-070711 OUTLINE The R5108G Series are CMOS-based µ con supervisory circuit, or high accuracy and ultra low supply current voltage detector with built-in delay and watchdog timer. When the SENSE voltage is down across the threshold, or the watchdog timer does not detect the system clock from the µ con, the reset output is generated. The voltage detector circuit is used for the system reset, etc. The detector threshold is fixed internally, and the tolerance is ±1.0%. The released delay time (Power-on Reset Delay) circuit is built-in, and output delay time is adjustable with an external capacitor. When the sense voltage becomes the released voltage, the reset state will be maintained during the delay time. The time out period of the watchdog timer can be also set with an external capacitor. The output type of the reset is selectable, Nch open-drain, or CMOS. There is a function to stop supervising clock by the watchdog timer (INH function). A necessary voltage source can be supervised with SENSE pin. The package is small SSOP-8G.

FEATURES

• Built-in a watchdog timer's time out period accuracy ±30%
• Timeout period for watchdog and generating a reset signal can be set by an external capacitor
• Power-on reset delay time of the voltage detector can be set with an external capacitor. APPLICATION
• Supervisory circuit for equipment with using microprocessors.

The selection can be made with designating the part number as shown below: R5108Gxx1x-TR ← part Number ↑ ↑ ↑ ↑ a b c d Code Descriptions a Designation of Package Type; G: SSOP8G (2.9mmx4.0mm) b Designation of Detector Threshold Voltage (-VDET) 0.1V stepwise setting is possible in the range from 1.5V to 5.5V c Designation of the output type of RESETB A: Nch Open-drain C: CMOS Output d Designation of Taping Type PIN CONFIGURATION SSOP8G (0.65mm pitch) PIN DESCRIPTION Pin No Symbol Pin Description

1 RESETB

Output Pin for Reset signal of Watchdog timer and Voltage Detector. (Output “L” at detecting Detector Threshold and Watchdog Timer Reset.)

2 SENSE Voltage Detector Voltage Sense Pin

3 CD External Capacitor Pin for Setting Delay Time of Voltage Detector

4 GND Ground Pin

5 SCK Clock Input Pin from Microprocessor

6 INH Inhibit Pin ("L": Inhibit the watchdog timer)

7 TW External Capacitor Pin for Setting Reset and Watchdog Timeout

8 VDD Power supply Pin

Topt=25°C, VSS=0V Symbol Item Rating Unit VIN Supply Voltage -0.3∼7.0 V VCD Voltage of C D Pin -0.3∼VIN+0.3 V VTW Voltage of TW Pin -0.3∼VIN+0.3 V VRESETB Output Voltage Voltage of RESETB Pin -0.3∼7.0 V VSCK Voltage of SCK Pin -0.3∼7.0 V VINH Voltage of INH Pin -0.3∼7.0 V VSENSE Input Voltage Voltage of SENSE Pin -0.3∼7.0 V IRESETB Output Current Current of RESETB Pin 20 mA PD Power Dissipation 300 mW Topt Operating Temperature Range -40∼+105 °C Tstg Storage Temperature Range -55∼+125 °C

ELECTRICAL CHARACTERISTICS

R5108GxxxA/C Unless otherwise specified, VIN=6.0V, CTW=0.1uF, CD=0.1uF, Rpull-up=100kΩ ,Topt=25°C The number of Bold font applied to the temperature range from -40°C to 105°C Symbol Item Conditions Min. Typ. Max. Unit VIN Operating Voltage 1.5 6.0 V Iss Supply Current VIN=(-VDET)+0.5V Clock Pulse Input 11 15 µA Voltage Detector -VDET Detector Threshold SENSE pin Threshold x0.990 x0.972 x1.010 x1.015 V ∆-VDET/ ∆Topt Detector Threshold Temperature Coefficient -40°C≤Topt≤105°C ±100 ppm/ VHYS Detector Threshold Hysteresis (-VDET) x0.03 (-VDET) x0.05 (-VDET)x 0.07 V tpLH Output Delay Time CD=0.1µF 340 370 467 ms VINL Minimum Operating Voltage RESETB≤0.1V, pull-up=100kΩ 0.6 0.9 V IDOUTN Output Current (RESETB Output pin) Nch, VDD=1.2V, VDS=0.1V 0.38 0.80 mA IDOUTP Output Current (RESETB Output pin) Nch, VDD=6.0V, VDS=0.5V(R5108GxxxC) 0.65 0.90 mA Watchdog Timer TWD Watchdog Timeout period C TW=0.1uF 230 310 450 ms TWR Reset Hold Time of WDT C TW=0.1uF 29 34 48 ms VSCKH SCK Input "H" VINx0.8 6.0 V VSCKL SCK Input "L" 0.0 VINx0.2 V VINHH INH Input "H" 1.0 6.0 V

Symbol Item Conditions Min. Typ. Max. Unit VINHL INH Input "L" 0.00 0.35 V RINH INH pull-up Resistance 60 110 164 kΩ TSCKW SCK Input Pulse Width VSCKL=VINx0.2, VSCKH=VINx0.8 500 ns *Bold Type is guaranteed by design. TYPICAL APPLICATIONS TEST CIRCUIT Supply Current Test Circuit Power s upply R CTWC CD SW R5108GxxxA Series GND V DD C D RESETB SCK TW INH SENSE µ P VDD I/O RESET SENSE R5108GxxxC Series GND V DD C D RESETB SCK TW INH Power supply CTWC CD SW µ P V DD I/O RESET Clock Input R5108GxxxA/C Series GND V DD C D RESETB SCK TW INH SENSE C CD C TW R(R5108Gx xxA) A

TIMING DIAGRAM (R5108GxxxA/R5108GxxxC) (Nch open-drain, RESETB pin is pulled up to VDD.) TW SCK VrefH VrefL ＩNＨ RESETB tpLH tpHL SENSE +VDET -VDET tpLH VDD CD VTCD TWD TWR TWDI

/G4d When the SENSE pin voltage becomes more than the released voltage (+V DET), after the released delay time (or the power on reset time tpLH), the output of RESETB becomes “H” level. /G4e When the SCK pulse is input, the watchdog timer is cleared, and TW pin mode changes from discharge mode to charge mode. When the TW pin voltage becomes higher than VREFH, the mode will change into discharge, and next watchdog time count starts. /G4f Unless the SCK pulse is input, WDT will not be cleared, and during the charging period of TW pin, RESETB="L". /G50 When the SENSE pin becomes lower than the detector threshold voltage, RESETB outputs "L". /G51 If "L" signal is input to the INH pin, the RESETB outputs "H", regardless the SCK clock state. /G52 When the signal to the INH pin is set from "L" to "H", the watchdog starts supervising the system clock. ∗ Watchdog Timeout period/Reset hold time The watchdog timeout period and reset hold time can be set with an external capacitor to TW pin. The next equations describe the relation between the watchdog timeout period and the external capacitor value, or the reset hold time and the external capacitor value. t tWR(s)=tWD/9 The watchdog timer (WDT) timeout period is determined with the discharge time of the external capacitor. During the watchdog timeout period, if the clock pulse from the system is detected, WDT is cleared and the capacitor is charged. When the charge of the capacitor completes, another watchdog timeout period starts again. During the watchdog timeout period, if the clock pulse from the system is not detected, during the next reset hold time RESETB pin outputs "L". After starting the watchdog timeout period, (just after from the discharge of the external capacitor) even if the clock pulse is input during the time period "TWDI", the clock pulse is ignored. TWDI[s]=TWD/10 Released Delay Time (Power-on Reset delay time) The released delay time can be set with an external capacitor connected to the CD pin. The next equation describes the relation between the capacitance value and the released delay time (tpLH). tpLH(s)=3.7×10 6× C(F) Note that the temperature dependence graph in the typical characteristics does not contain the temperature characteristics of the external capacitor. /G3 Minimum Operating V oltage (VINL) We specified the minimum operating voltage as the minimum input voltage in which the condition of RESETB pin being 0.1V or lower than 0.1V . (Herein, pull-up resistance is set as 100kΩ in the case of the Nch open-drain output type. Inhibit (INH) Function If INH pin is set at "L", the watchdog timer stops monitoring the clock, and the RESETB output will be dominant by the voltage detector's operation. Therefore, if the SENSE pin voltage is set at more than the detector threshold level, RESETB outputs "H" regardless the clock pulse. INH pin is pulled up with a resistor (TYP. 110kΩ ) internally.

Built-in V oltage detector monitors the input voltage for SENSE pin. To obtain the normal detector threshold, Vin ≥1.5V must be secured. RESETB Output RESETB pin's output type is selectable either the Nch open-drain output or CMOS output. If the Nch open-drain type output is selected, the RESETB pin is pulled up with an external resistor to an appropriate voltage source. Clock Pulse Input Built-in watchdog timer is cleared with the SCK clock pulse within the watchdog timeout period. APPLICATION NOTES If a resistor is connected to the VDD pin, the operation might be unstable with the supply current of IC itself. Connection examples affected by the conduction current R5108 VDD VIN RESETB R5108 VDD VIN RESETB VIN R5108 CMOS Output VDD RESETB tpLH VDD C D RESETB Perfect Discharge DET +V +V TCD TCD tpLH1 Power on Reset Operation against the input gtlitch (tpLH1 < tpLH ) Imperfect Discharge -V DET

1) Supply Current vs. Input Voltage 2) Detector Threshold vs. Temperature R510xN151A/C, R510xG151A/C 0 1 23456 SUPPLY VOLTAGE [V] CURRENT Iss [uA] 25℃ 105℃ -50℃ R510xN301A/C, R510xG301A/A 0 1 23456 SUPPLY VOLTAGE [V] CURRENT Iss [uA] 25℃ -50℃ 105℃ R510xN151A/C, R510xG151A/C 1.470 1.480 1.490 1.500 1.510 1.520 1.530 -50 -25 0 25 50 75 100 125 TEMPERATURE [℃] DETECT VOLTAGE [V] R510xN271A/C, R510xG271A/C 2.660 2.670 2.680 2.690 2.700 2.710 2.720 2.730 2.740 -50 -25 0 25 50 75 100 125 TEMPERATURE [℃] DETECT VOLTAGE [V] R510xN421A/C R510xG421A/C 4.120 4.140 4.160 4.180 4.200 4.220 4.240 4.260 4.280 -50 -25 0 25 50 75 100 125 TEMPERATURE [℃] DETECT VOLTAGE [V]

3) Detector Threshold Hysteresis vs. Temperature 4) Detector Threshold vs. Input V oltage R510xN151A/C R510xG151A/C 3.0 4.0 5.0 6.0 7.0 -50 -25 0 25 50 75 100 125 TEMPERATURE [℃] HYSTERESIS [%] R510xN271A/C R510xG271A/C 3.0 4.0 5.0 6.0 7.0 -50 -25 0 25 50 75 100 125 TEMPERATURE [℃] HYSTERESIS [%] R510xN421A/C R510xG421A/C 3.000 4.000 5.000 6.000 7.000 -50 -25 0 25 50 75 100 125 TEMPERATURE [℃] HYSTERESIS [%] R5108G151A/C 1.47 1.48 1.49 1.5 1.51 1.52 1.53 SUPPLY VOLTAGE VDD [V] DETECT VOLTAGE [V] Topt=25℃

5) Nch Driver Output Current vs. V DS Topt=25°C 6) Nch Driver Output Current vs. V DD 7) Pch Driver Output Current vs. VDD R510xN, R510xG VDS [V] OUTPUT CURRENT [mA] VDD=1.0V VDD=6.0V VDD=5.0V VDD=4.0V VDD=3.0V VDD=2.0V VDD=1.5V R510xN, R510xG 0 1 23456 SUPPLY VOLTAGE VDD [V] OUTPUT CURRENT [mA] Vds=0.3V 105℃ 25℃ Topt=-40℃ R510xN, R510xG 0 1 23456 SUPPLY VOLTAGE VDD [V] OUTPUT CURRENT [mA] Vds=0.5V 105℃ 25℃Topt=-40℃ R510xN, R510xG 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 1 23456 SUPPLY VOLTAGE [V] OUTPUT CURRENT [mA] VDS=0.3V 105℃ 25℃ -40℃ R510xN, R510xG 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 1 23456 SUPPLY VOLTAGE [V] OUTPUT CURRENT [mA] VDS=0.5V 105℃ 25℃ -40℃

8) Released Delay Time vs. Input Voltage 9) Released Delay Time vs. Temperature 10) Detector Output Delay Time vs. Temperature 11) WDT Reset Timer vs. Temperature R510xN, R510xG 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 1 23456 SUPPLY VOLTAGE [V] OUTPUT CURRENT [mA] VDS=1.0V 105℃ 25℃ -40℃ R510xN, R510xG 300 320 340 360 380 400 420 440 460 480 500 0 1 23456 7 SUPPLY VOLTAGE [V] POWER ON RESET DELAY tpLH [ms] Topt=25℃ R510xN, R510xG 300 320 340 360 380 400 420 440 460 480 500 -50 -25 0 25 50 75 100 125 150 TEMPERATURE [℃] POWER ON RESET DELAY tpLH[ms] VDD=6V R510xN, R510xG 100 -50 -25 0 25 50 75 100 125 TEMPERATURE [℃] TIME [usec] (-VDET)+1 (-VDET)-1 1us INPUT R510xN, R510xG -50 -25 0 25 50 75 100 125 TEMPERATURE [℃] RESET TIME [msec]

12) WDT Timeout Period vs. Temperature 13) WDT Reset Timer vs. Input V oltage 14) WDT Timeout Period vs. Input V oltage R510xN, R510xG 200 220 240 260 280 300 320 340 360 380 400 -50 -25 0 25 50 75 100 125 TEMPERATURE [℃] Timeout Period [msec] R510xN, R510xG 1 23456 SUPPLY VOLTAGE [V] RESET TIME [msec] R510xN, R510xG 200 220 240 260 280 300 320 340 360 380 400 123456 SUPPLY VOLTAGE [V] Timeout Period [msec]