MIC6315_08 MICREL | Alldatasheet

Document overview

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  • PDF pages: 6

Technical content

Features

  • Precision voltage monitor for 3V, 3.3V or 5V power sup- plies
  • /RESET remains valid with VCC as low as 1V
  • 5µA supply current
  • 20ms, 140ms, 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 Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

M9999-091608 2 September 2008 Pin Description Pin Number Pin Name Pin Function 1 GND IC Ground Pin. 2 /RESET /RESET goes low if VCC falls below the reset threshold and remains asserted for one reset timeout period after VCC exceeds the reset threshold. 3 /MR 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. 4 VCC Power Supply Input. Pin Configuration MR

4 VCCGND

MIC6315-xxDyU 4-Lead SOT-143 Ordering Information(1, 2) Standard Pb-Free Nominal Min. tRST Operating Part Number Marking Part Number Marking VTH (V) (ms) Temp. Range Package MIC6315-26D2U NY MIC6315-26D2UY NY 2.63 20 –40°C to +85°C 4-lead SOT-143 MIC6315-29D2U NM MIC6315-29D2UY NM 2.93 20 –40°C to +85°C 4-lead SOT-143 MIC6315-30D2U N2 MIC6315-30D2UY N2 3.00 20 –40°C to +85°C 4-lead SOT-143 MIC6315-31D2U NF MIC6315-31D2UY NF 3.08 20 –40°C to +85°C 4-lead SOT-143 MIC6315-40D2U NW MIC6315-40D2UY NW 4.00 20 –40°C to +85°C 4-lead SOT-143 MIC6315-41D2U N6 MIC6315-41D2UY N6 4.10 20 –40°C to +85°C 4-lead SOT-143 MIC6315-44D2U NG MIC6315-44D2UY NG 4.38 20 –40°C to +85°C 4-lead SOT-143 MIC6315-46D2U NQ MIC6315-46D2UY NQ 4.63 20 –40°C to +85°C 4-lead SOT-143 MIC6315-26D3U NR MIC6315-26D3UY NR 2.63 140 –40°C to +85°C 4-lead SOT-143 MIC6315-29D3U NP MIC6315-29D3UY NP 2.93 140 –40°C to +85°C 4-lead SOT-143 MIC6315-30D3U N3 MIC6315-30D3UY N3 3.00 140 –40°C to +85°C 4-lead SOT-143 MIC6315-31D3U NU MIC6315-31D3UY NU 3.08 140 –40°C to +85°C 4-lead SOT-143 MIC6315-40D3U N8 MIC6315-40D3UY N8 4.00 140 –40°C to +85°C 4-lead SOT-143 MIC6315-41D3U N5 MIC6315-41D3UY N5 4.10 140 –40°C to +85°C 4-lead SOT-143 MIC6315-42D3U 0N MIC6315-42D3UY 0N 4.20 140 –40°C to +85°C 4-lead SOT-143 MIC6315-44D3U NH MIC6315-44D3UY NH 4.38 140 –40°C to +85°C 4-lead SOT-143 MIC6315-46D3U NX MIC6315-46D3UY NX 4.63 140 –40°C to +85°C 4-lead SOT-143 MIC6315-26D4U NS MIC6315-26D4UY NS 2.63 1100 –40°C to +85°C 4-lead SOT-143 MIC6315-29D4U NN MIC6315-29D4UY NN 2.93 1100 –40°C to +85°C 4-lead SOT-143 MIC6315-30D4U N4 MIC6315-30D4UY N4 3.00 1100 –40°C to +85°C 4-lead SOT-143 MIC6315-31D4U 2N MIC6315-31D4UY 2N 3.08 1100 –40°C to +85°C 4-lead SOT-143 MIC6315-40D4U M9 MIC6315-40D4UY M9 4.00 1100 –40°C to +85°C 4-lead SOT-143 MIC6315-41D4U M7 MIC6315-41D4UY M7 4.10 1100 –40°C to +85°C 4-lead SOT-143 MIC6315-44D4U NJ MIC6315-44D4UY NJ 4.38 1100 –40°C to +85°C 4-lead SOT-143 MIC6315-46D4U NZ MIC6315-46D4UY NZ 4.63 1100 –40°C to +85°C 4-lead SOT-143 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.

September 2008 3 M9999-091608 MIC6315 Micrel

Electrical Characteristics

For typical values, VCC = 2.5V to 5.5V, TA = 25°C; bold values indicate –40°C ≤ TA ≤ +85°C; unless noted Symbol Parameter Condition Min Typ Max Units VCC Operating Voltage Range 1 5.5 V ICC Supply Current VCC = 5.5V, no load 5 15 µA VCC = 3.6V, no load 5 10 µA VTH Reset Voltage Threshold Note 4 VTH–2.5% V TH VTH+2.5% V tRST Reset Timeout Period D2U 20 28 44 ms D3U 140 200 320 ms D4U 1100 1500 2500 ms VOL /RESET Output Voltage VCC ≥ 4.0V, ISINK = 3.2mA 0.4 V VCC > 2.5V, ISINK = 1.2mA 0.3 V VCC ≥ 1.0V, ISINK = 50µA 0.3 V /RESET Output Leakage /RESET deasserted 1 µA /MR Minimum Pulse Width 10 µs /MR to Reset Delay 0.5 µs VIH /MR Input Threshold VTH > 4.0V 2.3 V VTH < 4.0V 0.7×VCC V VIL /MR Input Threshold VTH > 4.0V 0.8 V VTH < 4.0V 0.25×VCC V /MR Pull-Up Resistance 10 20 30 kΩ /MR Glitch Immunity 100 ns Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 4. Various reset thresholds available. See ordering information or contact factory. Absolute Maximum Ratings(1) Terminal Voltage Operating Ratings(2)

M9999-091608 4 September 2008 Functional Diagram -Reset Threshold (V) VCC (4) RESET (2) GND (1) RESET GENERATOR MR (3) Timing Diagram VCC /MR /RESET tRST tRST VTH Reset Timing Diagram

September 2008 5 M9999-091608 MIC6315 Micrel Applications Information Microprocessor Reset The /RESET pin is asserted whenever V CC 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 V CC has risen above the reset threshold or /MR has returned high. The reset function en- sure the microprocessor is properly reset and powers up in a known condition after a power failure. /RESET will remain valid with V CC as low as 1V. The /RESET output is a simple open-drain N-channel MOS- FET structure. A pull-up resistor must be used to pull this output up to some voltage. For most applications, this volt- age will be the same power supply that supplies V CC 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 V CC 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. 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. V CC Transients The MIC6315 is relatively immune to negative-going V CC glitches below the reset threshold. Typically, a negative-going transient 125mV below the reset threshold with a duration of 20µs 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. VCC RESET 5V SYSTEM RESET VCC MIC6315 +5.0V MR 10k +3.3V MIC6315 Used in a Multiple Supply System

M9999-091608 6 September 2008

Package Information

0.150 (0.0059) 0.089 (0.0035)8 0.400 (0.016) TYP 3 PLACES 2.50 (0.098) 2.10 (0.083) 1.40 (0.055) 1.20 (0.047) 0.950 (0.0374) TYP 3.05 (0.120) 2.67 (0.105) 0.800 (0.031) TYP 1.12 (0.044) 0.81 (0.032) 0.10 (0.004) 0.013 (0.0005) DIMENSIONS: MM (INCH) 0.41 (0.016) 0.13 (0.005) CL CL 4-Pin SOT-143 (U) 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 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. © 2005 Micrel, Incorporated.