UM706LS_15 UNIONSEMI | Alldatasheet
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Technical content
Features
Applications Using DSPs, Microcontrollers or Microprocessors Programmable Controls Computers Embedded Systems Industrial Equipments Intelligent Instruments Wireless Communications Systems Wide Operation Voltage Range of 1V to 5.5V Correct Logic Output Guaranteed to VCC=1.0V Precision Supply-Voltage Monitor: 2.63V, 200ms Reset Pulse Width Independent Watchdog Timer -1.6s Timeout (UM706xS, UM813xS) Active-High Reset Output (UM708xS, UM813xS) Voltage Monitor for Power -Fail or Low-Battery Warning Temperature Range: -40° C to +85°C Supply Current of 80μA (Typ) Pin Configurations Top View 4 5 8MR VCC GND PFI PFO WDI RESET WDO UM706xS 1 2 3 4 5678 UM706 XS XX XX: Week Code UM706xS SOP8
http://www.union-ic.com Rev.07 Aug.2015 2/17 UM706xS/UM708xS/UM813xS Pin Configurations Top View 4 5 8MR VCC GND PFI PFO NC RESET RESET UM708xS 1 2 3 4 5678 UM708 XS XX XX: Week Code UM708xS SOP8 4 5 8MR VCC GND PFI PFO WDI RESET WDO UM813xS 1 2 3 4 5678 UM813 XS XX XX: Week Code UM813xS SOP8
Ordering Information
Threshold (V) Timeout Period (ms) Package Type UM706LS UM706LS 4.63 240 SOP8 UM706MS UM706MS 4.38 240 UM706TS UM706TS 3.08 240 UM706SS UM706SS 2.93 240 UM706RS UM706RS 2.63 240 UM708LS UM708LS 4.63 240 UM708MS UM708MS 4.38 240 UM708TS UM708TS 3.08 240 UM708SS UM708SS 2.93 240 UM708RS UM708RS 2.63 240 UM813LS UM813LS 4.63 240 UM813MS UM813MS 4.38 240 UM813TS UM813TS 3.08 240 UM813SS UM813SS 2.93 240 UM813RS UM813RS 2.63 240
http://www.union-ic.com Rev.07 Aug.2015 4/17 UM706xS/UM708xS/UM813xS Pin Description Pin Number Pin Name Function 1 MR Manual-Reset Input triggers a reset pulse when pulled below 0.8V. This active-low input has an internal 250μA pull-up current. It can be driven from a TTL or CMOS logic line as well as shorted to ground with a switch.
2 VCC Supply Input
3 GND Ground Reference for all signals.
4 PFI
Power-Fail Voltage Monitor Input. When PFI is less than 1.25V, PFO goes low. Connect PFI to GND or VCC when not used.
5 PFO
Power-Fail Output goes low and sinks current when PFI is less than 1.25V; otherwise PFO stays high. UM706, UM813 WDI Watchdog Input. If WDI remains either high or low for 1.6sec, the internal watchdog timer runs out and the WDO goes low. Floating WDI or connecting WDI to a high-impedance three-state buffer disables the watchdog feature. The internal watchdog timer clears whenever reset is asserted, WDI is three -stated, or WDI sees a rising or falling edge. UM708 NC No Connect UM706, UM708 RESET Active-Low Reset Output pulses low for 200ms when trigged, and stays low whenever V CC is below the reset threshold. It remains low for 200ms after V CC rises above the reset threshold or MR goes from Low to High. UM813 RESET Active-High Reset Output is the inverse of RESET Whenever RESET is high, RESET is low, and vice versa. UM706, UM813 WDO Watchdog Output pulls low when the internal watchdog timer finishes its 1.6sec count and does not go high again until the watchdog is cleared. WDO also goes low during low-line conditions. Whenever V CC is below the reset threshold, WDO stays low; however, unlike RESET , WDO does not have a minimum pulse width. As soon as V CC rises above the reset threshold, WDO goes high with no delay. UM708 RESET Active-High Reset Output is the inverse of RESET Whenever RESET is high, RESET is low, and vice versa.
http://www.union-ic.com Rev.07 Aug.2015 5/17 UM706xS/UM708xS/UM813xS Absolute Maximum Ratings (Note 1) Symbol Parameter Value Unit VCC Supply Voltage -0.3 to +6.0 V RESET, RESET (Push-Pull) -0.3 to VCC +0.3 V ICC Input Current, VCC 20 mA IO Output Current, RESET, RESET 20 mA Rate of Rise, VCC 100 V/μs PD Continuous Power Dissipation 471 mW TJ Operating Junction Temperature -40 to +105 °C TSTG Storage Temperature Range -65 to +150 °C Lead Temperature (soldering, 10s) 300 °C Note 1: Stresses beyond those listed under “Absolute maximum Ratings” may cause permanent damage to the device.
Electrical Characteristics
VCC=full range, T A=-40° C to +85° C, unless otherwise noted. Typical values are at T A=+25° C, VCC=5V for L/M versions, VCC=3.3V for T/S versions, and VCC=3V for R version. (Note 2) Symbol Parameter Conditions Min Typ Max Unit VCC VCC Range TA=0°C to +70°C 1.0 5.5 V ICC Supply Current TA=-40°C to +85°C 80 150 μA VTH Reset Threshold UM706L/ UM708L/UM813L V UM706M/ UM708M/UM813M UM706T/ UM708T/UM813T UM706S/ UM708S/UM813S UM706R/ UM708R/UM813R Reset Threshold Hysteresis 40 mV tRS Reset Pulse Width 140 200 280 ms Note 2: Production testing done at TA=+25° C; limits over temperature guaranteed by design only.
http://www.union-ic.com Rev.07 Aug.2015 6/17 UM706xS/UM708xS/UM813xS Electrical Characteristics (Continued) VCC=full range, T A=-40° C to +85° C, unless otherwise noted. Typical values are at T A=+25° C, VCC=5V for L/M versions, VCC=3.3V for T/S versions, and VCC=3V for R version. (Note 2) Symbol Parameter Conditions Min Typ Max Unit VOL RESET/RESET Output Voltage Low ISINK=1.2mA (for R/S/T versions) 0.3 V ISINK=3.2mA (for L/M versions) 0.4 VCC=1.2V, ISINK=100µA 0.3 VOH RESET/RESET Output Voltage High ISOURCE=800µA VCC-1.5 V MR Pull-Up Current MR =0V 600 µA tMR MR Pulse Width 150 ns MR Input Threshold, Low 0.8 V MR Input Threshold, High 2.0 V tMD MR to Reset Out Delay 250 ns PFI Input Threshold VCC=5V 1.20 1.25 1.30 V PFI Input Current -25 0.01 +25 nA PFO Output V oltage ISOURCE=800µA Vcc-1.5 V ISINK=3.2mA 0.4 Watchdog Function for UM706/UM813 tWD Watchdog Timeout Period 1.0 1.6 2.25 s tWP WDI Pulse Width VIL=0.4V, VIH=0.8VCC 50 ns WDI Input Threshold Low VCC=5V 0.8 V WDI Input Threshold High VCC=5V 3.5 V WDI Input Current WDI=VCC 10 µA WDI=0V -10 WDO Output Voltage High ISOURCE=800µA Vcc-1.5 V WDO Output Voltage Low ISINK=1.2mA 0.4 V Note 2: Production testing done at TA=+25° C; limits over temperature guaranteed by design only.
8 WDO
Figure 4. UM706xS/UM813xS Block Diagram Figure 5. UM708xS Block Diagram
http://www.union-ic.com Rev.07 Aug.2015 8/17 UM706xS/UM708xS/UM813xS Typical Operating Characteristics RESET Output Voltage vs. Supply Voltage RESET Response Time Power-Fail Comparator Assertion Power-Fail Comparator De-assertion Response Time Response Time (a) (b) (c) (d) VCC RESET 2V/div 2V/div 500ms/div PFO PFI 2V/div 1V/div 200ns/div PFO PFI 2V/div 1V/div 200ns/div VCC RESET 2V/div 2V/div 10μs/div 1kΩ30pF PFI +5V PFO +1.25V (a) (b) (c) (d) VCC GND RESET 2kΩ 330pF VCC RESET VCC GND RESET 10kΩ 30pF VCC RESET + 1kΩ 30pF PFI +5V PFO +1.25V
http://www.union-ic.com Rev.07 Aug.2015 9/17 UM706xS/UM708xS/UM813xS Typical Operating Characteristics (Continued) RESET Output Voltage vs. Supply Voltage RESET Response Time RESET, RESET Assertion RESET, RESET De-assertion (e) (f) VCC RESET 500ms/div RESET RESET 200ns/div RESET RESET 200ns/div VCC RESET 20μs/div 2V/div 2V/div 2V/div 2V/div 2V/div 2V/div 2V/div 2V/div VCC GND RESET 10kΩ 330pF (e) (e) (f) (f) VCC GND RESET 10kΩ 330pF RESET 10kΩ 330pF
http://www.union-ic.com Rev.07 Aug.2015 10/17 UM706xS/UM708xS/UM813xS Detailed Description Power-Fail Reset The reset output provides a reset signal to the microprocessor whenever the VCC input is below the threshold. An internal timer holds the reset output active for 200ms after the voltage on V CC rises above the threshold. This is inten ded as a power -on reset signal for the microprocessor. It allows time for both the power supply and the microprocessor to stabilize after power -up. If a power supply brownout or interruption occurs, the reset line is similarly activated and re mains active for 200ms after the supply recovers. If another interruption occurs during an active reset period, the reset timeout period continues for an additional 200ms. The reset output is guaranteed to remain valid with V CC as low as 1V . This ensures that the microprocessor is held in a stable shutdown condition as the power supply starts up. The UM706 xS provides an active low RESET signal while the UM813xS provides an active high RESET s ignal. T he UM708 xS has both an active high RESET output and an active low RESET output. Power-Fail Comparator The power-fail comparator can be used for various purposes because its output and non-inverting input are not internally connected. The inverting input is internally connected to a 1.25V reference. To build an early-warning circuit for power failure, connect the PFI pin to a voltage driver, choose the voltage divider ratio so that the voltage at PFI falls below 1.25V just before the regulator drops out. Use PFO to interrupt the µP so it can prepare for an orderly power-down. Manual Reset The Manual-Reset input ( MR ) allows reset to be trigged by a pushbutton switch. The switch is effectively d ebounced by the 140 ms minimum reset pulse width. MR is TTL/CMOS logic compatible, so it can be driven by an external logic line. If unused, MR input can be tied high or left floating. Watchdog Timer The UM706xS/UM813xS watchdog circuit monitors the μP’s activity. If the μP does not toggle the watchdog input (WDI) within 1.6sec and WDI is not three-stated, WDO goes low. As long as RESET is asserted or the WDI input is three-stated, the watchdog timer will stay cleared and will not count. As soon as reset is released and WDI is driven high or low, the timer will start counting. Pulses as short as 50ns can be detected. Typically, WDO will be connected to the non-maskable interrupt input (NMI) of a μP. When VCC drops below the reset threshold, WDO will go low whether or not the watchdog timer has timed out yet. Normally this would trigger an NMI interrupt, but RESET goes low simultaneously, and thus overrides the NMI interrupt. If WDI is left unconnected, WDO can be used as a low-line output. Since floating WDI disables the internal timer, WDO goes low only when V CC falls below the reset threshold, thus functioning as a low-line output. The UM706xS has a watchdog timer and a RESET output. The UM708xS has both active-high and active-low reset outputs. The UM813xS has both an active-high reset output and a watchdog timer.
http://www.union-ic.com Rev.07 Aug.2015 12/17 UM706xS/UM708xS/UM813xS Applications Information Valid RESET below 1V VCC The UM706xS/UM708xS/UM813xS are guaranteed to provide a valid reset level with VCC as low as 1V. When VCC falls below 1V, the internal transistor does not have sufficient drive to hold it on so the voltage on RESET is no longer held at 0V. If a pull-down resistor is added to the RESET pin as shown in Figure 8, any stray charge or leakage current will be drained to ground, holding RESET low. Resistor value (R1) is not critical. It should be about 100kΩ, large enough not to load RESET and small enough to pull RESET to ground. Monitoring Additional Supply Levels It is possible to use the power-fail comparator to monitor a second supply as shown in Figure 9. The two sensing resistors, R1 and R2, are selected such that the voltage on PFI drops below 1.25V at the minimum acceptable input supply. The PFO output can be connected to the MR input so that a reset is generated when the supply drops out of tolerance. In this case, if either supply drops out of tolerance, a reset is generated. Monitoring a Negative Voltage The power-fail comparator can also monitor a negative supply rail (Figure 10). When the negative rail is good (a negative voltage of large magnitude), PFO is low, and when the negative rail is degraded (a negative voltage of lesser magnitude), PFO is high. By adding the resistors and transistor as shown, a high PFO triggers reset . As long as PFO remains high, theUM706xS/UM708xS/UM813xS will keep reset asserted ( RESET =low, RESET =high). Note that this circuit’s accuracy depends on the PFI threshold tolerance, the VCC line, and the resistors. Microprocessor with Bidirectional Reset To prevent contention for microprocessors with a bidirectional reset line, a current limiting resistor is to be inserted between the RESET output pin and the microprocessor reset pin. This limits the current to a safe level if there are conflicting output reset levels. A suitable resistor value is 4.7kΩ. If the reset output is required for other uses, it should b e buffered as shown in Figure 11.
http://www.union-ic.com Rev.07 Aug.2015 14/17 UM706xS/UM708xS/UM813xS
Package Information
D e E 1 2 Top View L c End View b A Side View θ DIMENSIONS Symbol MILLIMETERS INCHES Min Max Min Max A 1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.33 0.51 0.013 0.020 c 0.170 0.250 0.006 0.010 D 4.700 5.100 0.185 0.200 E 3.800 4.000 0.150 0.157 E1 5.800 6.200 0.228 0.244 e 1.270 (BSC) 0.050 (BSC) L 0.400 1.270 0.016 0.050 θ 0° 8° 0° 8° Land Pattern 4.95 1.30 1.27 0.50 NOTES: 1. Compound dimension: 4.90×3.90; 2. Unit: mm; 3. General to lerance ± 0.05mm unless otherwise specified; 4. The layout is just for reference. Tape and Reel Orientation UM706 XS XX
http://www.union-ic.com Rev.07 Aug.2015 15/17 UM706xS/UM708xS/UM813xS UM708xS SOP8 Outline Drawing D e E 1 2 Top View L c End View b A Side View θ DIMENSIONS Symbol MILLIMETERS INCHES Min Max Min Max A 1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.33 0.51 0.013 0.020 c 0.170 0.250 0.006 0.010 D 4.700 5.100 0.185 0.200 E 3.800 4.000 0.150 0.157 E1 5.800 6.200 0.228 0.244 e 1.270 (BSC) 0.050 (BSC) L 0.400 1.270 0.016 0.050 θ 0° 8° 0° 8° Land Pattern 4.95 1.30 1.27 0.50 NOTES: 1. Compound dimension: 4.90× 3.90; 2. Unit: mm; 3. General tolerance ± 0.05mm unless otherwise specified; 4. The layout is just for reference. Tape and Reel Orientation UM708 XS XX
http://www.union-ic.com Rev.07 Aug.2015 16/17 UM706xS/UM708xS/UM813xS UM813xS SOP8 Outline Drawing D e E 1 2 Top View L c End View b A Side View θ DIMENSIONS Symbol MILLIMETERS INCHES Min Max Min Max A 1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.33 0.51 0.013 0.020 c 0.170 0.250 0.006 0.010 D 4.700 5.100 0.185 0.200 E 3.800 4.000 0.150 0.157 E1 5.800 6.200 0.228 0.244 e 1.270 (BSC) 0.050 (BSC) L 0.400 1.270 0.016 0.050 θ 0° 8° 0° 8° Land Pattern 4.95 1.30 1.27 0.50 NOTES: 1. Compound dimension: 4.90× 3.90; 2. Unit: mm; 3. General tolerance ± 0.05mm unless otherwise specified; 4. The layout is just for reference. Tape and Reel Orientation UM813 XS XX
http://www.union-ic.com Rev.07 Aug.2015 17/17 UM706xS/UM708xS/UM813xS GREEN COMPLIANCE Union Semiconductor is committed to environmental excellence in all aspects of its operations including meeting or exceeding regulatory requirements with respect to the use of hazardous substances. Numerous succ essful programs have been implemented to reduce the use of hazardous substances and/or emissions. All Union components are compliant with the RoHS directive, which helps to support customers in their compliance with environmental directives. For more green compliance information, please visit: http://www.union-ic.com/index.aspx?cat_code=RoHSDeclaration IMPORTANT NOTICE The information in this document has been carefully reviewed and is believed to be accurate. Nonetheless, this document is subject to change without notice. Union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contained information, or to notify a person or organization of any update. Union reserves the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. Union Semiconductor, Inc Add: Unit 606, No.570 Shengxia Road, Shanghai 201210 Tel: 021-51093966 Fax: 021-51026018 Website: www.union-ic.com