11187d.book Page 1 Friday, September 10, 1999 8:52 AM MCP100/101 Microcontroller Supervisory Circuit with Push-Pull Output FEATURES PACKAGES • Holds microcontroller in reset until supply voltage reaches stable operating level • Resets microcontroller during power loss • Precision monitoring of 3V, 3.3V, and 5V systems • 7 voltage trip points available • Active low RESET pin (MCP100) or active high RESET (MCP101) • Push-pull output • Holds RESET/RESET for 350 ms (typical) • Guaranteed RESET/RESET to VDD = 1.0V • Accuracy of ±125mV for 5V systems and ±75mV for 3V systems over temperature • 45 µA typical operating current • Temperature range: - Industrial (I): -40°C to +85°C TO-92 with ‘H’ Bondout TO-92 with ‘D’ Bondout RST OR RST VDD VDD VSS RST VSS OR RST MCP100 MCP101 MCP100 MCP101 SOT-23-3 DESCRIPTION The Microchip Technology Inc. MCP100/101 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. Both devices are available with a choice of seven different trip voltages and both have push-pull outputs. The MCP100 has a low active RESET pin and the MCP101 has a high active RESET pin. The MCP100/101 will assert the RESET/RESET signal whenever the voltage on the VDD pin is below the trip-point voltage. RST OR RST VSS VDD MCP100 MCP101 BLOCK DIAGRAM VDD Comparator + - Delay Circuit Output Driver RESET or RESET Bandgap Reference 1999 Microchip Technology Inc. Preliminary DS11187D-page 1 11187d.book Page 2 Friday, September 10, 1999 8:52 AM MCP100/101 1.0 ELECTRICAL CHARACTERISTICS 1.1 Maximum Ratings* *Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. VDD ..................................................................................7.0V All inputs and outputs w.r.t. VSS ............... -0.6V to VDD +1.0V Storage temperature .....................................-65°C to +150°C Ambient temp. with power applied ................-65°C to +125°C Soldering temperature of leads (10 seconds) ............. +300°C ESD protection on all pins .................................................. ≥ 2 kV DC AND AC CHARACTERISTICS All parameters apply at the specified temp and voltage ranges unless otherwise noted. PARAMETER Operating Voltage Range VDD Value to Guarantee RESET/ RESET Operating current SYMBOL MIN VDD 1.0 VDDMIN 1.0 IDD MCP10X-270 MCP10X-300 MCP10X-315 MCP10X-450 MCP10X-460 MCP10X-475 MCP10X-485 VDD Trip Point VTRIP MCP100-450 MCP100-460 MCP100-475 MCP100-485 RESET High Level MCP100-XXX Output Voltage (All VTRIP Points) (MCP100) MCP101-450 MCP101-460 MCP101-475 MCP101-485 MCP101-XXX (All VTRIP Points) MAX UNITS 5.5 V TEST CONDITIONS V 45 60 µA 2.625 2.925 3.075 4.375 4.475 4.625 4.725 2.7 3.0 3.15 4.50 4.60 4.75 4.85 V 0.4 V VOL 0.6 VDD-0.7 VDD = 5.5V (no load) IOL = 3.2mA, VDD = VTRIPMIN IOL = 8.5mA, VDD = VTRIPMIN V IOH = 3mA,VDD > VTRIPMAX V IOL = 3.2mA, VDD > VTRIPMAX VOH MCP101-270 MCP101-300 MCP101-315 RESET Low Level Output Voltage (MCP101) 0.4 VOL 0.6 VDD-0.7 IOL = 8.5mA, VDD > VTRIPMAX V IOH = 3mA,VDD = VTRIPMIN VOH Threshold Hysteresis VHYS VDD Detect to RESET/RESET Inactive tRPU VDD Detect to RESET/RESET tRPD DS11187D-page 2 2.55 2.85 3.0 4.25 4.35 4.50 4.60 TYP MCP100-270 MCP100-300 MCP100-315 RESET Low Level Output Voltage (MCP100) RESET High level Output Voltage (MCP101) VDD = 1.0 - 5.5V Industrial (I):-40°C to +85°C 50 150 350 10 Preliminary mV 700 ms µs VDD ramped from VTRIPMAX + 250mV down to VTRIPMIN 250mV 1999 Microchip Technology Inc. 11187d.book Page 3 Friday, September 10, 1999 8:52 AM MCP100/101 VTRIP VDD tRPU tRPD VOH RESET (MCP100) VOL RESET (MCP101) VOL FIGURE 1-1: MCP100/101 Timing Diagram 2.0 APPLICATIONS INFORMATION 2.1 The Need for Supervisory Circuits 5V VTRIPMAX VTRIPMIN SUPPLY VOLTAGE For many of today’s microcontroller applications, care must be taken to prevent low power conditions that can cause many different system problems. The most common causes are brown-out conditions where the system supply drops below the operating level momentarily, and the second, is when a slowly decaying power supply causes the microcontroller to begin executing instructions without enough voltage to sustain SRAM and producing indeterminate results. (VTRIPMIN - VDD) TRANSIENT DURATION 0 TIME 0 VDD MICROCONTROLLER VSS VDD RST VDD 10 TA = +25°C 8 MCLR OR RESET TRANSIENT DURATION (µS) bypass capacitor MCP100 VSS 6 Transients above the curve will cause a reset 4 2 Transients below the curve will NOT cause a reset 0 FIGURE 2-1: Typical Application 0 1 2 3 4 5 VTRIP - VDD (V) 2.2 Negative Going V DD Transients Many system designers implementing POR circuits are concerned about the minimum pulse width required to cause a reset. Figure 2-2 shows typical transient duration vs. reset comparator overdrive for which the MCP100/101 will not generate a reset pulse. It shows that the farther below the trip point the transient pulse goes, the duration of the pulse required to cause a reset gets shorter. A 0.1 µF bypass cap mounted as close as possible to the VDD pin provides additional transient immunity. 1999 Microchip Technology Inc. FIGURE 2-2: Typical Transient Response Preliminary DS11187D-page 3 11187d.book Page 4 Friday, September 10, 1999 8:52 AM MCP100/101 Effect of Temperature on Timeout Period (tRPU) 1.002 NORMALIZED THRESHOLD* (VTRIP) 2.3 The timeout period (tRPU) determines how long the device remains in the reset condition. This is controlled by an internal RC timer and is effected by both VDD and temperature. The graph shown in Figure 2-3 shows typical response for different VDD values and temperatures. 0.998 0.996 0.994 0.992 700 TIMEOUT PERIOD (TRPU) (MS) 1.000 0.997 -40 600 -20 0 VDD = 6V 20 40 60 80 100 TEMPERATURE (°C) 500 * Multiply value at 25°C by this factor to determine the value at temperature VDD = 5V 400 FIGURE 2-5: Normalized VTRIP vs. Temperature 300 VDD = 4V 200 VDD = 3V 800 100 -40 VDD = 2.5V -20 0 20 40 60 80 100 700 VDD = 1.5V TEMPERATURE (°C) VDD = 3.5V 600 VOL (mV) FIGURE 2-3: Typical tRPU vs. Temperature 500 400 VDD = 4.5V 300 60 200 VDD = 5V 50 100 TA = +25°C VDD = 5.5V Operating Current (µA) 0 40 0 2 4 6 8 10 12 14 16 18 20 IOL (mA) 30 VDD = 3V FIGURE 2-6: VOL vs. IOL VDD = 4V 20 10 1.3 0 -40 -20 0 20 40 60 80 100 1.2 TEMPERATURE (°C) 1.1 NORMALIZED IOL* FIGURE 2-4: IDD vs. Temperature 1.00 0.9 0.8 0.7 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) * Multiply value at 25°C by this factor to determine the value at temperature FIGURE 2-7: Normalized IOL vs. Temperature DS11187D-page 4 Preliminary 1999 Microchip Technology Inc. 11187d.book Page 5 Friday, September 10, 1999 8:52 AM MCP100/101 1.08 800 VDD = 2.5V 700 1.04 1.02 600 NORMALIZED VOH* VDD - VOH (mV) 1.06 VDD = 3.5V 500 400 VDD = 5V 300 VDD=4.5V IOH=8.5mA 1.00 0.98 0.96 0.94 VDD=3V IOH=3.2mA 0.92 200 0.90 100 TA = +25°C 0.88 -40 0 0 2 4 6 8 10 -20 0 20 40 60 80 100 TEMPERATURE (°C) IOH (mA) * Multiply value at 25°C by this factor to determine the value at temperature FIGURE 2-8: VDD - VOH vs. IOH FIGURE 2-9: Normalized VOH vs. Temperature 1999 Microchip Technology Inc. Preliminary DS11187D-page 5 11187d.book Page 6 Friday, September 10, 1999 8:52 AM MCP100/101 NOTES: DS11187D-page 6 Preliminary 1999 Microchip Technology Inc. 11187d.book Page 7 Friday, September 10, 1999 8:52 AM MCP100/101 MCP100/101 PRODUCT IDENTIFICATION SYSTEM MCP100/101—xxx b I /pp TO = TO-92 (3-lead) [offered in bags only] TT = SOT-23 (3-lead) [offered in tape & reel only] Package: Temperature Range I = –40°C to +85°C (only offered in I) D = D Bond Option (see bond option chart below) H = H Bond Option Bondout Option (TO-92 only) 270 300 315 450 460 475 485 RESET/RESET VTRIP Voltage Device: = = = = = = = 2.55 ≤ VTRIP ≤ 2.70 2.85 ≤ VTRIP ≤ 3.00 3.00 ≤ VTRIP ≤ 3.15 4.25 ≤ VTRIP ≤ 4.50 4.35 ≤ VTRIP ≤ 4.60 4.50 ≤ VTRIP ≤ 4.75 4.60 ≤ VTRIP ≤ 4.85 MCP100 = Supervisor circuit with active low RESET output MCP100T = Supervisor circuit with active low RESET output (tape & reel) MCP101 = Supervisor circuit with active high RESET output MCP101T = Supervisor circuit with active high RESET output (tape & reel) Product Identification Options for MCP100/101 TO-92 with TO-92 with SOT-23-3 ‘D’ Bondout ‘H’ Bondout RST OR RST VDD OR RST V VSS DD RST VDD VSS RST VSS OR RST MCP100-xxxD I/TO MCP101-xxxD I/TO MCP100-xxxH I/TO MCP101-xxxH I/TO MCP100-xxx I/TT MCP101-xxx I/TT Example of Product Identification: For the MCP100 (active low RESET pin) with VTRIP range of 2.55V 2.70V in T0-92 package with ‘H’ bond option in industrial temp range, the part number would be: MCP100-270H I/TO. Sales and Support Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 786-7277. The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products. 1999 Microchip Technology Inc. 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