SP730EK-4.375

® SP730 Microprocessor Supervisory Circuit with Pull Up Resistor FEATURES ■ Holds Microcontroller in Reset ■ Reset Microcontroller during power loss ■ 4.375 Voltage Trip Point ■ Active Low RESET Pin ■ Internal Pull-up Resistor ■ Holds RESET for 350ms (typical) ■ RESET valid down to VDD1.0V ■ 45µA Typical Operating Current ■ Offered in a 3 Pin SOT-23 Package APPLICATIONS ■ Portable Electronic Devices ■ Electrical Power Meter ■ Computer System Board ■ Modem GND SP730 3 Pin SOT-23 RESET VDD Now Available in Lead Free Packaging DESCRIPTION The SP730 is a voltage supervisory device designed to keep a microcontroller in reset until the system voltage has reached the proper level and stabilized. It also operates as protection from brown-out conditions when the supply voltage drops below a safe operating level. The SP730 has an internal 5k pull-up resistor. The device has an active low RESET pin and will assert the RESET signal whenever the voltage on the VDD pin is below the trip-point voltage. The part is available in a small 3 pin SOT-23 package. Contact factory for other trip voltage options. TYPICAL APPLICATION CIRCUIT VDD Microcontroller SP730 VDD GND RESET Bypass Capacitor VDD MCLR or RESET GND Date: 6/14/04 SP730 Microprocessor Supervisory Circuit © Copyright 2004 Sipex Corporation 1 ABSOLUTE MAXIMUM RATINGS VDD ................................................................................................. 6.0V All inputs and outputs w.r.t. GND ............................... -0.6 to VDD+ 1.0V Storage Temperature .................................................. -65°C to +150°C Ambient Temperature with power applied.....................-65°C to +125°C ESD Protection on all pins ............................................................ ≥2kV These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. ELECTRICAL CHARACTERISTICS VDD = 1.0V - 5.5V ; -40°C to 85°C. The ♦ denotes the specifications which apply over the full operating temperature range, unless otherwise specified. Parameter Operating Voltage Range VDD Value to RESET Operating Current VDD Trip Point Threshold Hysteresis RESET Low Level Output Voltage RESET High Level Output Voltage Pull up Resistor VDD Detect to RESET Inactive Symbol VDD VDDMIN IDD VTRIP VHYS VOL VOH Min. 1.0 1.0 Typ. Max. 5.5 ♦ ♦ Units V V µA V mV V V K ms Conditions 45 4.25 4.375 50 60 4.50 ♦ ♦ ♦ VDD = 5.5V (no load) 0.6 VDD-.7 5 ♦ ♦ ♦ IOL = 8.5mA, VDD = VTRIP MIN IOH = 50µA, VDD > VTRIP MAX tRPU 150 350 700 ♦ VDD Detect to RESET tRPD 10 ♦ µS VDD ramped from VTRIP MAX (VTRIP MAX + 250mV) to (VTRIP MIN 250mV) Date: 6/14/04 SP730 Microprocessor Supervisory Circuit © Copyright 2004 Sipex Corporation 2 FUNCTIONAL DIAGRAM VDD Comparator Delay Circuit Output Driver RESET Bandgap Reference 5kΩ Internal pull up resistor TIMING DIAGRAM VTRIP VDD tRPU tRPD VOH RESET VOH Figure 1: SP730 Timing Diagram PIN DESCRIPTION PIN NUMBER 1 2 3 PIN NAME RESET VDD GND 3 PIN SOT-23 DESCRIPTION Active Low. This pin goes low whenever VDD falls below the reset threshold. Supply input. Ground. Date: 6/14/04 SP730 Microprocessor Supervisory Circuit © Copyright 2004 Sipex Corporation 3 TYPICAL PERFORMANCE CHARACTERISTICS Idd vs Temperature 60 50 Operating Current (uA) 40 30 Idd 20 10 0 -40 -20 0 20 Temperature ('C) 40 60 80 100 tRPU vs Temperature 700 600 500 Timeout Period (mS) 400 tRPU 300 200 100 -40 -20 0 20 Temperature ('C) 40 60 80 100 Date: 6/14/04 SP730 Microprocessor Supervisory Circuit © Copyright 2004 Sipex Corporation 4 TYPICAL PERFORMANCE CHARACTERISTICS Normalized VTRIP vs Temperature 1.0020 1.0000 0.9980 Normalized Threshold 0.9960 0.9940 0.9920 0.9900 -40 -20 0 20 Temperature ('C) 40 60 80 100 VOL vs IOL 1200 1100 1000 900 800 700 VOL (mV) 600 500 400 300 200 Vdd=4.25V Vdd=3.5V Vdd=2.5V Temp = 25'C 100 0 0 1 2 3.2 4 5 6 7 8.5 9 10 IOL (mA) 11 12 13 14 15 16 17 18 19 20 Date: 6/14/04 SP730 Microprocessor Supervisory Circuit © Copyright 2004 Sipex Corporation 5 3 PIN SOT-23 D b 3 B B E1 E SEE VIEW C 1 e 2 e1 L L1 Gauge Plane L2 VIEW C 3 PIN SOT-23 JEDEC TO-236 (AB) Variation MIN NOM MAX 0.89 0.01 0.88 0.30 0.08 2.80 2.10 1.20 0.30 .95 2.90 1.30 0.45 0.54 REF 0º 8º 1.12 0.10 1.02 0.50 0.20 3.04 2.64 1.40 0.60 A A1 Dimensions in (mm) A A A2 Seating Plane C A A1 A2 b c D E E1 L L1 Ø SIDE VIEW b WITH PLATING c BASE METAL 3 PIN SOT-23 Date: 6/14/04 SP730 Microprocessor Supervisory Circuit © Copyright 2004 Sipex Corporation 6 ORDERING INFORMATION Part number Top Mark Temperature Package SP730EK-4.375...............V3WW................-40°-85°..............................3 Pin SOT-23 SP730EK-4.375/TR.........V3WW................-40°-85°..............................3 Pin SOT-23 Contact factory for other trip voltage options. Available in lead free packaging. To order add "-L" suffix to part number. Example: SP730EK-4.375/TR = standard; SP730EK-4.375-L/TR = lead free /TR = Tape and Reel Pack quantity is 2500 for SOT-23. Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Date: 6/14/04 SP730 Microprocessor Supervisory Circuit © Copyright 2004 Sipex Corporation 7