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MIC6315
Micrel
MIC6315
Open-Drain P Reset Circuit
General Description
The MIC6315 is an inexpensive reset generator circuit that monitors power supplies in microprocessor based systems. The function of this device is to assert a reset if either the power supply drops below a designated reset threshold level or /MR is forced low. Several different reset threshold levels are available to accommodate 3V, 3.3V or 5V powered systems. The MIC6315 has an active low, open-drain /RESET output. The reset output is guaranteed to remain asserted for a minimum of either 20ms, 140ms, or 1100ms after VCC has risen above the designed reset threshold level. The MIC6315 comes in a 4-pin SOT-143 package.
Features
* Precision voltage monitor for 3V, 3.3V or 5V power supplies * /RESET remains valid with VCC as low as 1.4V * <15A supply current * 20ms, 40ms, or 1100ms minimum reset pulse widths available * Manual reset input * 4-pin SOT-143 package
Applications
* * * * * Portable equipment Intelligent instruments Critical microprocessor power monitoring Printers/computers Embedded controllers
Typical Application
VCC VCC VCC
10k
MIC6315
MR RESET
P RESET
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
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Micrel
Ordering Information(1, 2)
Part Number MIC6315-26D2U MIC6315-29D2U MIC6315-30D2U MIC6315-31D2U MIC6315-44D2U MIC6315-46D2U MIC6315-26D3U MIC6315-29D3U MIC6315-30D3U MIC6315-31D3U MIC6315-44D3U MIC6315-46D3U MIC6315-26D4U MIC6315-29D4U MIC6315-30D4U MIC6315-31D4U MIC6315-44D4U MIC6315-46D4U
Notes 1. All devices available in tape and reel only. 2. Parts not yet assigned an identification code are shown as "zz". Contact Micrel for details. Minimum order may apply.
Marking NY NM N2 zz zz zz NR NP N3 NU zz NX NS NN N4 zz zz NZ
Nominal VTH (V) 2.63 2.93 3.00 3.08 4.38 4.63 2.63 2.93 3.00 3.08 4.38 4.63 2.63 2.93 3.00 3.08 4.38 4.63
Min. tRST (ms) Operating Temp. Range 20 20 20 20 20 20 140 140 140 140 140 140 1100 1100 1100 1100 1100 1100 -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C
Package 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143 4-lead SOT-143
Pin Configuration
GND 1 4 VCC
MIC6315
RESET 2 3 MR
MIC6315-xxDyU 4-Lead SOT-143
Pin Description
Pin Number 1 2 3 Pin Name GND /RESET /MR Pin Function IC Ground Pin. /RESET goes low if VCC falls below the reset threshold and remains asserted for one reset timeout period after VCC exceeds the reset threshold. Manual Reset Input. A logic low on /MR forces a reset. The reset will remain asserted as long as /MR is held low and for one reset timeout period after /MR goes high. This input can be shorted to ground via a switch or be driven by TTL or CMOS logic. Float if unused. Power Supply Input.
4
VCC
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Micrel
Absolute Maximum Ratings(1)
Terminal Voltage (VCC, /RESET) ...................................... -0.3V to 6.0V (/MR) ........................................ -0.3V to (VCC + 0.3V) Rate of Rise (VCC) ................................................. 100V/s Input Current (VCC, /MR) ............................................ 20mA Output Current (/RESET) ........................................... 20mA Lead Temperature (soldering, 10 sec.) ..................... 300C Storage Temperature (TS) ........................ -65C to 150C ESD Rating(3)
Operating Ratings(2)
Operating Temperature Range .................. -40C to +85C Input Voltage (/RESET) .................................... GND - 5.5V Power Dissipation (TA = +70C) .............................. 320mW
Electrical Characteristics
For typical values, VCC = 2.5V to 5.5V, TA = 25C; bold values indicate -40C TA +85C; unless noted Symbol Parameter Operating Voltage Range ICC VTH tRST Supply Current VCC = 5.5V, no load VCC = 3.6V, no load Reset Voltage Threshold Reset Timeout Period Note 4 VTH-2.5% 20 140 1100 VOL /RESET Output Voltage VCC > 4.25V, ISINK = 3.2mA VCC > 2.5V, ISINK = 1.2mA VCC > 1.4V, ISINK = 50A /RESET Output Leakage /MR Minimum Pulse Width /MR to Reset Delay VIH VIL /MR Input Threshold VTH > 4.0V VTH > 4.0V /MR Input Threshold VTH > 4.0V VTH > 4.0V /MR Pull-Up Resistance /MR Glitch Immunity
Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 4. Various reset thresholds available. See ordering information or contact factory.
Condition
Min 1.4
Typ
Max 5.5
Units V A A V ms ms ms V V V A s s V V
9 6 VTH 28 200 1500
15 10 VTH+2.5% 44 320 2500 0.4 0.3 0.3 1
/RESET deasserted 10 0.5 2.3 0.7xVCC x
0.8 0.25xVCC x 10 20 100 30
V V k ns
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Timing Diagram
VCC VTH
/MR
/RESET
tRST
tRST
Reset Timing Diagram
Functional Diagram
VCC (4) Reset Threshold (V)
+ RESET GENERATOR
RESET (2)
MR (3)
GND (1)
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Wire OR'ing The /RESET Output Because the RESET output is open-drain, several reset sources can be wire-ORed in parallel to allow resets from multiple sources. VCC Transients The MIC6315 is relatively immune to negative-going VCC glitches below the reset threshold. Typically, a negativegoing transient 125mV below the reset threshold with a duration of 25s or less will not cause an unwanted reset. If additional transient immunity is needed, a bypass capacitor can be placed a close as possible to the MIC6315.
Applications Information
Microprocessor Reset The /RESET pin is asserted whenever VCC falls below the reset threshold voltage or if /MR (manual reset) is forced low. The /RESET pin remains asserted for the duration of the reset timeout period after VCC has risen above the reset threshold or /MR has returned high. The reset function ensures the microprocessor is properly reset and powers up in a known condition after a power failure. /RESET will remain valid with VCC as low as 1.4V. The /RESET output is a simple open-drain N-channel MOSFET structure. A pull-up resistor must be used to pull this output up to some voltage. For most applications, this voltage will be the same power supply that supplies VCC to the MIC6315. It is possible however to tie this resistor to some other voltage. This will allow the MIC6315 to monitor one voltage while level-shifting the /RESET output to some other voltage. The pull-up voltage must be limited to 6.0V or less (absolute maximum) to avoid damage to the MIC6315. The resistor must be small enough to supply current to the inputs and leakage paths that are driven by the /RESET output. /RESET Valid at Low Voltage As VCC drops to 0V, the MIC6315 will no longer be able to pull the /RESET output low. At this point, the pull-up resistor will pull the output high. The value of the pull-up resistor and the voltage it is connected to will affect the point at which this happens.
+3.3V VCC
+5.0V VCC
10k
MIC6315
MR RESET
5V SYSTEM
RESET
MIC6315 Used in a Multiple Supply System
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Package Information
0.950 (0.0374) TYP
C L
1.40 (0.055) 2.50 (0.098) 1.20 (0.047) 2.10 (0.083) C L 1.12 (0.044) 0.81 (0.032)
DIMENSIONS: MM (INCH) 0.150 (0.0059) 0.089 (0.0035)
3.05 (0.120) 2.67 (0.105)
8 0
0.800 (0.031) TYP 0.400 (0.016) TYP 3 PLACES
0.10 (0.004) 0.013 (0.0005)
0.41 (0.016) 0.13 (0.005)
4-Pin SOT-143 (U)
MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 474-1000
WEB
http://www.micrel.com
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2004 Micrel, Incorporated. M9999-071504
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