MIC2794 Supervisor with Fast Propagation Delay and Capacitor-Programmable Reset Delay General Description Features The MIC2794 is a low-current supervisor with capacitorprogrammable reset delay time. It provides an active-low manual reset input and active-low open-drain, active-low push-pull, or active-high push-pull outputs. The device initiates a reset signal when the sense input drops below the threshold voltage (between 0.4V and 4.6V), or the manual input is asserted low. The active-low reset stays low for the duration of the reset timeout delay once the monitored voltage or the manual reset exceed their thresholds. The reset timeout delay period is programmable from 1.25ms to 10s with an external capacitor. • • • • The MIC2794 operates from a supply voltage of 1.65V to 5.5V and guarantees an active-low reset output for supply voltages equal to or greater than 1V. The device is rated to operate over the temperature range of −40°C to +125°C. Datasheets and support documentation are available on Micrel’s web site at: www.micrel.com. • • • • • • 1.65V to 5.5V operating supply voltage range Ultra-low operating current: 2µA (typical) Fast propagation delay: 20µs (typical) Fixed threshold voltages and 0.4V reference voltage (adjustable from 0.4V to 4.6) − ±2.0% threshold accuracy from –40°C to +125°C Programmable reset timeout delay (from 1.25ms to 10s) Manual reset input with an internal pull-up resistor Active-low/high multiple output options: − Open-drain active-low (/RESET) − Push-pull active-low (/RESET) − Push-pull active-high (RESET) −40°C to +125°C junction temperature range 6-pin TSOT 6-pin 1.6mm × 1.6mm Thin DFN Applications • Microprocessor systems • Computers, tablets • Intelligent instruments Typical Application Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com May 12, 2015 Revision 1.2 Micrel, Inc. MIC2794 Ordering Information Marking Code Typical Threshold Voltage (VTH) /RESET Output (Active-Low) RESET Output (ActiveHigh) Junction Temperature Range Package MIC2794H-04VD6 QP 0.400V − Push-Pull –40°C to +125°C 6-pin TSOT MIC2794L-04VD6 QO 0.400V Push-Pull − –40°C to +125°C 6-pin TSOT (2, 3) Part Number QN 0.400V Open-Drain − –40°C to +125°C 6-pin TSOT (1) QQ 0.840V Open-Drain − –40°C to +125°C 6-pin TSOT (1) QR 1.120V Open-Drain − –40°C to +125°C 6-pin TSOT (1) QU 1.400V Open-Drain − –40°C to +125°C 6-pin TSOT (1) QV 1.670V Open-Drain − –40°C to +125°C 6-pin TSOT (1) QX 2.330V Open-Drain − –40°C to +125°C 6-pin TSOT (1) QZ 3.070V Open-Drain − –40°C to +125°C 6-pin TSOT (1) MIC2794N-46VD6 BQ 4.650V Open-Drain − –40°C to +125°C 6-pin TSOT MIC2794H-04VMT QC 0.400V − Push-Pull –40°C to +125°C 6-pin 1.6mm × 1.6mm TDFN MIC2794L-04VMT QB 0.400V Push-Pull − –40°C to +125°C 6-pin 1.6mm × 1.6mm TDFN MIC2794N-04VD6 MIC2794N-08VD6 MIC2794N-11VD6 MIC2794N-14VD6 MIC2794N-16VD6 MIC2794N-23VD6 MIC2794N-30VD6 QA 0.400V Open-Drain − –40°C to +125°C 6-pin 1.6mm × 1.6mm TDFN MIC2794N-08VMT (1) QD 0.840V Open-Drain − –40°C to +125°C 6-pin 1.6mm × 1.6mm TDFN MIC2794N-11VMT (1) QE 1.120V Open-Drain − –40°C to +125°C 6-pin 1.6mm × 1.6mm TDFN MIC2794N-14VMT (1) QG 1.400V Open-Drain − –40°C to +125°C 6-pin 1.6mm × 1.6mm TDFN MIC2794N-16VMT (1) QH 1.670V Open-Drain − –40°C to +125°C 6-pin 1.6mm × 1.6mm TDFN MIC2794N-23VMT (1) QJ 2.330V Open-Drain − –40°C to +125°C 6-pin 1.6mm × 1.6mm TDFN MIC2794N-30VMT (1) QL 3.070V Open-Drain − –40°C to +125°C 6-pin 1.6mm × 1.6mm TDFN MIC2794N-46VMT (1) QM 4.650V Open-Drain − –40°C to +125°C 6-pin 1.6mm × 1.6mm TDFN MIC2794N-04VMT Note: 1. Contact factory for availability. 2. All devices are available in Tape & Reel only. (Order entry PN, add TR. Example: MIC2794H-04VD6 TR). 3. Standard/Full reel quantity: a. 6-pin TSOT: 3,000 pieces per reel, Reel diameter is 7 inches, Hub diameter is 2 inches, Width is 8mm. b. 6-pin TDFN: 5,000 pieces per reel, Reel diameter is 13 inches, Hub diameter is 7 inches, Width is 8mm. Part Numbering Convention May 12, 2015 2 Revision 1.2 Micrel, Inc. MIC2794 Pin Configuration 6-Pin TSOT (D6) (Top View) 6-Pin 1.6mm × 1.6mm TDFN (MT) (Top View) Pin Description Pin Number TSOT-6 Pin Number TDFN Pin Name Pin Function 1 6 /RESET /RESET is an active-low output pin and is available in an open-drain or push-pull configuration. The /RESET pin is asserted low when /MR is set to a logic low or the SNS voltage decreases below the threshold voltage. /RESET will remain low for the reset timeout delay after SNS > (VTH + VHYST) and /MR is set to a logic high. In the open-drain configuration, an external pull-up resistor to VDD is required, the pushpull configuration does not require a pull-up resistor. 1 6 RESET RESET is an active-high push-pull output and is asserted high when /MR is set to a logic low or the SNS voltage decreases below the threshold voltage. RESET will remain high for the reset timeout delay after SNS > (VTH + VHYST) and /MR is set to a logic high. 2 5 GND Supply Ground. 3 4 CTH Programmable timeout delay. Connect a capacitor (up to 1.5µF) to ground to set a user defined reset delay time. Leave this pin unconnected for a reset delay time of 20ms. Connect to VDD via a resistor (40kΩ to 200kΩ) to set a reset delay time of 320ms. 4 3 /MR Manual reset is an active-low logic pin and internally pulled to VDD through a 109kΩ pullup resistor. Pulling the /MR input to a logic low asserts /RESET. /RESET will remain low for the reset timeout delay after /MR is pulled to logic high. 5 2 SNS Connect-sense pin to the voltage to be monitored or through a resistor divider. When this voltage decreases below the threshold voltage, VTH, /RESET is asserted low. 6 1 VDD Supply voltage pin. Bypass this pin to GND with a 1µF capacitor placed as close to the pin as possible. − EP EP May 12, 2015 Exposed Pad. Connect to ground plane. 3 Revision 1.2 Micrel, Inc. MIC2794 Absolute Maximum Ratings(4) Operating Ratings(5) Supply Voltage (VDD) .................................... −0.3V to +6.0V SNS, /MR, CTH.................................................. −0.3V to VDD /RESET (open drain) ........................................ -0.3V to +6V /RESET, RESET (push-pull) ................. −0.3V to VDD +0.3V Lead Temperature (soldering, 10s) ............................ 260°C Storage Temperature (TS) ......................... −55°C to +150°C ESD Rating (Human Body Model)(6) .............................. 2kV ESD Rating (Machine Model)( 6) ................................... 200V Supply Voltage (VDD) .................................... +1.0V to +5.5V SNS, /MR, EN, CTH ............................................... 0V to VDD /RESET, RESET ................................................... 0V to VDD Junction Temperature (TJ) ........................ −40°C to +125°C Junction Thermal Resistance TSOT-6 (θJA) ................................................. 177.2°C/W 1.6mm × 1.6mm TDFN-6 (θJA) ........................ 92.4°C/W Electrical Characteristics(7) VDD = 1.65V to 5.5V; RL = 100kΩ; CL = 50pF; TA = 25°C, bold values indicate −40°C ≤ TA ≤ +125°C, unless noted. Parameter Condition Min. Supply Voltage (VDD) /RESET output valid 1.65 Power-up Reset Voltage (VDDmin) Output guaranteed in defined state Supply Current (IDD) Sense Threshold Voltage Accuracy (VTH) Sense Hysteresis Voltage (VHYST) Sense Input Bias Current Sense Pulse Width to Reset Typ. Max. Units 5.5 V 1.0 V VDD = 3.3V, CT, /MR = open /RESET and RESET not asserted 2 VDD = 5V, CT, /MR = open /RESET and RESET not asserted 2.5 6 5 µA VTH = 0.400V −2.0 ±1.0 +2.0 0.8V < VTH < 3.3V −1.5 ±0.5 +1.5 3.3V < VTH < 5.5V −2.0 ±1.0 +2.0 ± 1.5 +2.5 % +25 nA Sense rising −25 VSNS = 0.400V % VSNS = 5.5V 1.5 µA VSNS = 1.05 * VTH → 0.95 * VTH 20 µs 20 µs /RESET & RESET Output Specifications SNS to /RESET and or RESET (8) Propagation Delay /RESET, RESET Logic Low Output Voltage 1V ≤ VDD < 1.3V, IOL = 15µA 0.3 1.3V ≤ VDD < 1.8V, IOL = 0.4mA 0.3 1.8V ≤ VDD < 5.5V, IOL = 1mA 0.4 V 1V ≤ VDD < 1.1V, IOH = 1µA Push-Pull /RESET, RESET Logic High Output Voltage 1.1V ≤ VDD < 1.3V, IOH = 15µA 1.3V ≤ VDD < 1.8V, IOH = 0.4mA 0.8*VDD V 1.8V ≤ VDD < 5.5V, IOH = 1mA Notes: 4. Exceeding the absolute maximum ratings may damage the device. 5. The device is not guaranteed to function outside its operating ratings. 6. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF. 7. Specification for packaged product only. 8. SNS to /RESET and or RESET propagation delay is the delay time for SNS voltage to transition from VTH*1.05 to VTH * 0.95 to /RESET and or RESET assertion. May 12, 2015 4 Revision 1.2 Micrel, Inc. MIC2794 Electrical Characteristics(7) (Continued) VDD = 3.3V; RRESET = 100kΩ; CTH = 1nF; TA = 25°C, bold values indicate −40°C ≤ TA ≤ +125°C, unless noted. Parameter Condition Open Drain /RESET Leakage Current V/RESET = 5.5V, not asserted RESET Delay Time Min. Typ. Max. Units 500 nA CTH = open 12 14 28 CTH = VDD 180 240 400 CTH = 100pF 0.75 1.25 1.75 CTH = 180nF 700 1200 1700 70 109 kΩ 150 ns ms /MR Input Specifications /MR Internal Pull-Up Resistance /MR to /RESET and RESET Propagation Delay 1 /MR Pulse Width to Reset 0.25*VDD /MR Logic Low Input Voltage 0.75*VDD /MR Logic High Input Voltage May 12, 2015 µs 5 V V Revision 1.2 Micrel, Inc. MIC2794 Typical Characteristics Supply Current vs. Supply Voltage 1.6 SUPPLY CURRENT (µA) 3 125˚C 2.5 25˚C 2 1.5 1 -40˚C 0.5 1.6 RESET TIMEOUT DELAY (s) RESET TIMEOUT DELAY (ms) 3.5 1.4 1.2 1 0.8 3 2 4 5 1 0.6 2 3 4 5 6 1 3 2 4 5 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) RESET Timeout Delay vs. CTH RESET Timeout Delay vs. Temperature RESET Timeout Delay vs. Temperature 1000 100 10 VDD = 3.3V 1 1.7 1.8 1.6 1.7 RESET TIMEOUT DELAY (s) RESET TIMEOUT DELAY (ms) RESET TIMEOUT DELAY (ms) 0.8 0.4 6 10000 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 VDD = 3.3V CTH = 100pF 0.6 0.5 1 10 100 1000 10000 -40 -20 CTH (nF) NORMALIZED SNS THRESHOLD (%) 1.5 1 SNS RISING 0.5 0 -0.5 SNS FALLING -1 3 4 SUPPLY VOLTAGE (V) May 12, 2015 20 40 60 80 100 5 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 VDD = 3.3V CTH = 180nF 0.6 120 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) SNS Threshold vs. Temperature 2 2 0 6 1.6 0.7 TEMPERATURE (°C) Normalized SNS Threshold vs. Supply Voltage 1 1 SUPPLY VOLTAGE (V) 100000 0.1 1.2 CTH = 180nF 0.6 0 1 1.4 CTH = 100pF RESET NOT ASSERTED NORMALIZED SNS THRESHOLD (%) RESET Timeout Delay vs. Supply Voltage RESET Timeout Delay vs. Supply Voltage 6 2.0 1.5 SNS RISING 1.0 0.5 0.0 -0.5 SNS FALLING -1.0 -1.5 VDD = 3.3V -2.0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 6 Revision 1.2 Micrel, Inc. MIC2794 Timing Diagrams Figure 1. Timeout and Propagation Delay from Sense to /RESET and RESET Figure 2. Timeout and Propagation Delay from /MR to /RESET and RESET May 12, 2015 7 Revision 1.2 Micrel, Inc. MIC2794 Functional Diagram Figure 3. MIC2794 Functional Block Diagrams May 12, 2015 8 Revision 1.2 Micrel, Inc. MIC2794 Functional Description Design and Product Advantages The MIC2794 is a highly-responsive supervisor circuit with a fast propagation delay of 20µs. Additional features includes a manual reset input pin and a capacitorprogrammable reset timeout delay. The MIC2794 is ideal for monitoring highly-accurate core voltages that require quick response in the event of a fault condition. The capacitor-programmable reset delay helps protect against an accidental system glitch during a reset timeout. To set RTOP and RBOTTOM, use Equation 1 and set an arbitrary RTOP value greater than 100kΩ and solve for RBOTTOM or vice versa. VDD The input supply (VDD) provides power to the comparators and logic timers. VDD operating range is 1.65V to 5.5V. The reset output is also guaranteed to be in the correct state with VDD greater than 1V. An input capacitor of 1µF with a minimum voltage rating of 6.3V is recommended. Refer to PCB Layout Recommendations for details. GND The ground (GND) pin is the return path for VDD, logic gates, and output pins. Refer to PCB Layout Recommendations for details. RTOP VMONITOR = 0.4V × 1 + R BOTTOM Eq. 1 /MR Manual reset (/MR) is an active-low input pin that is internally pull-up to VDD with a 109kΩ resistor. When /MR is asserted to a logic-low level, /RESET will transition to a logic low signal while RESET will transition to a logic high signal. See the Timing Diagrams section for more information. CTH CTH is a programmable timeout delay pin. Connect a capacitor to ground (from 100pF up to 1.5µF) to set a reset timeout delay ranging from 1.25ms to 10s. Refer to the RESET Timeout Delay vs. CTH plot in the Typical Characteristics section for examples. /RESET /RESET is an active-low output and is available in two output configurations: open-drain or push-pull. The opendrain configuration requires an external pull-up resistor, while the push-pull doesn’t. SNS For fixed voltage threshold parts the sense (SNS) pin can be connected directly to the monitored voltage. For the adjustable (-04) part, the sense (SNS) pin monitors the user’s voltage divided down to a fixed threshold. The resistor divider network in Figure 4 has to be set in order for the sense threshold to function properly (0.4V threshold shown, see the ordering table for threshold voltage options). /RESET is asserted low when /MR is set to a logic-low or the SNS voltage decreases below the threshold voltage. /RESET will remain low for the programmed reset timeout delay after SNS > (VTH + VHYST) and /MR is set to a logichigh, and then /RESET will transition high to indicate normal regulation. See the Timing Diagrams section for more information. RESET RESET is an active-high push-pull output and is asserted high when /MR is set to a logic low or the SNS voltage decreases below the threshold voltage. RESET will remain high for the programmed reset timeout delay after SNS > (VTH + VHYST) and /MR is set to a logic high, and then RESET will transition low to indicate normal regulation. See the Timing Diagrams section for more information. Figure 4. Resistor Divider on SNS pin May 12, 2015 9 Revision 1.2 Micrel, Inc. MIC2794 Typical Application Schematics May 12, 2015 10 Revision 1.2 Micrel, Inc. MIC2794 Bill of Materials Item Part Number 06036D105KAT2A C1 GRM188R61C105KA93D C1608X7R0J105KT 0603D184KAT2A C2 GRM188R71C184KA01D C1608X7R0J184KA93D Manufacturer Description Qty. (9) AVX Murata(10) Capacitor, 1µF, 16V, X7R, 0603 1 Capacitor, 180nF,16V, X7R, 0603 1 (11) TDK AVX Murata TDK R1 ERJ-3GEYJ104V Panasonic(12) Resistor, 100kΩ, 1/10W, 5%, 0603 1 U1 MIC2794x-xxVMT MIC2794x-xxVD6 Micrel, Inc.(13) Supervisor with Fast Propagation Delay and CapacitorProgrammable Reset Delay 1 Notes: 9. AVX: www.avx.com. 10. Murata: www.murata.com. 11. TDK: www.tdk.com. 12. Panasonic: industrial.panasonic.com 13. Micrel, Inc.: www.micrel.com. May 12, 2015 11 Revision 1.2 Micrel, Inc. MIC2794 PCB Layout Recommendations Top Layer Bottom Layer May 12, 2015 12 Revision 1.2 Micrel, Inc. MIC2794 Package Information(14) and Recommended Land Pattern (TSOT-6) 6-Pin TSOT (D6) Note: 14. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com. May 12, 2015 13 Revision 1.2 Micrel, Inc. MIC2794 Package Information(14) and Recommended Land Pattern (1.6mm × 1.6mm TDFN-6) 6-Pin 1.6mm × 1.6mm TDFN (MT) May 12, 2015 14 Revision 1.2 Micrel, Inc. MIC2794 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel, Inc. is a leading global manufacturer of IC solutions for the worldwide high performance linear and power, LAN, and timing & communications markets. The Company’s products include advanced mixed-signal, analog & power semiconductors; high-performance communication, clock management, MEMs-based clock oscillators & crystal-less clock generators, Ethernet switches, and physical layer transceiver ICs. Company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products. Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support offices and advanced technology design centers situated throughout the Americas, Europe, and Asia. Additionally, the Company maintains an extensive network of distributors and reps worldwide. Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this datasheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. 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 a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2015 Micrel, Incorporated. May 12, 2015 15 Revision 1.2