TC1041 Linear Building Block – Dual Low Power Comparator and Voltage Reference with Programmable Hysteresis Features General Description • Combines Two Comparators and a Voltage Reference in a Single Package • Optimized for Single Supply Operation • Available in Two Small Packages: 8-Pin SOIC or 8-Pin MSOP • Ultra Low Input Bias Current: Less than 100pA • Low Quiescent Current, Operating: 10µA (Typ.) • Rail-to-Rail Inputs and Outputs • Operates Down to VDD = 1.8V • Programmable Hysteresis The TC1041 is a mixed-function device combining two comparators and a voltage reference in a single 8-pin package. The inverting inputs of both comparators are internally connected to the reference. Applications • • • • Power Supply Circuits Battery Operated Equipment Consumer Products Replacements for Discrete Components Device Selection Table Part Number Package Temperature Range TC1041CEOA 8-Pin SOIC -40°C to +85°C TC1041CEUA 8-Pin MSOP -40°C to +85°C This increased integration allows the user to replace two packages, which saves space, lowers supply current and increases system performance. The TC1041 operates from two 1.5V alkaline cells down to VDD = 1.8V. It requires only 10µA typical supply current which significantly extends battery life. The TC1041 provides a simple method for adding user-adjustable hysteresis without feedback or complex external circuitry. Hysteresis is adjusted with a simple resistor divider on the HYST pin. Rail-to-rail inputs and outputs allow operation from low supply voltages with large input and output signal swings. Packaged in an 8-Pin SOIC or 8-Pin MSOP, the TC1041 is ideal for applications requiring low power and small packages. Functional Block Diagram OUTA TC1041 1 8 OUTB Package Types VSS OUTA VSS 1 7 INA+ 3 INB- 4 TC1041CEOA TC1041CEUA 2002 Microchip Technology Inc. A + 8 2 2 OUTB VDD 6 REF 5 HYST INA+ 7 B – + 8-Pin SOIC 8-Pin MSOP – 6 3 VDD REF Voltage Reference INB+ 5 4 HYST VSS DS21346B-page 1 TC1041 1.0 ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS* Supply Voltage ......................................................6.0V Voltage on Any Pin .......... (V SS – 0.3V) to (VDD + 0.3V) Junction Temperature....................................... +150°C Operating Temperature Range............. -40°C to +85°C Storage Temperature Range .............. -55°C to +150°C *Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. TC1041 ELECTRICAL SPECIFICATIONS Electrical Characteristics: Typical values apply at 25°C and VDD = 3.0V. Minimum and maximum values apply for TA = -40° to +85°C and VDD = 1.8V to 5.5V, unless otherwise specified. Symbol Parameter Min Typ Max Units VDD Supply Voltage 1.8 — 5.5 V IQ Supply Current Operating — 10 15 µA Test Conditions All Outputs Open Comparators VIR IN+ Voltage Range VSS – 0.2 — VDD + 0.2 V V OS Input Offset Voltage -5 -5 — +5 +5 mV mV VDD = 3V, TA = 25°C TA = -40°C to 85°C (Note 1) IB Input Bias Current — — ±100 pA TA = 25°C, IN+ = VDD to VSS VOH Output High Voltage VDD – 0.3 — — V RL = 10kΩ to VSS VOL Output Low Voltage — — 0.3 V RL = 10kΩ to VDD CMRR Common Mode Rejection Ratio 66 — — dB TA = 25°C, VDD = 5V VCM = VDD to VSS PSRR Power Supply Rejection Ratio 60 — — dB TA = 25°C VDD = 1.8V to 5V ISRC Output Source Current 1 — — mA IN+ = VDD , Output Shorted to VSS VDD = 1.8V ISINK Output Sink Current 2 — — mA IN+ = VSS, Output Shorted to VDD VDD = 1.8V V HYST Voltage Range at HYST Pin VREF – 0.08 — VREF V IHYST Hysteresis Input Current — — ±100 nA tPD1 Response Time — 4 — µsec 100mV Overdrive, C L = 100pF tPD2 Response Time — 6 — µsec 10mV Overdrive, CL = 100pF 1.176 1.200 1.224 V 50 — — µA 50 — — µA Voltage Reference Reference Voltage V REF IREF(SOURCE) Source Current IREF(SINK) Sink Current CL(REF) Load Capacitance — — 100 pF E VREF Noise Voltage — 20 — µVRMS 100Hz to 100kHz eVREF Noise Voltage Density — 1.0 — µV/√Hz 1kHz Note 1: VOS is measured as (VUT + VLT – 2VREF )/2 where VUT is the upper hysteresis threshold and VLT is the lower hysteresis threshold with VREF – VHYST set to 10mV. This represents the assymetry of the hysteresis thresholds around VREF. DS21346B-page 2 2002 Microchip Technology Inc. TC1041 2.0 PIN DESCRIPTION The description of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. (8-Pin SOIC) (8-Pin MSOP) Symbol 1 OUTA Description Comparator output. Negative power supply. 2 VSS 3 INA+ Non-inverting input to Comparator A. 4 INB- Non-Inverting input to Comparator B. 5 HYST 6 REF Voltage reference output. 7 VDD Positive power supply. 8 OUTB 2002 Microchip Technology Inc. Adjustable hysteresis input. Comparator output. DS21346B-page 3 TC1041 3.0 DETAILED DESCRIPTION 3.2 A 2.0 percent tolerance, internally biased, 1.20V bandgap voltage reference is included in the TC1041. It has a push-pull output capable of sourcing and sinking at least 50µA. The TC1041 is one of a series of very low power, linear building block products targeted at low voltage operation. The TC1041 contains two comparators and a voltage reference and operates at a minimum supply voltage of 1.8V with a typical current consumption of 10µA. Both comparators have programmable hysteresis. 3.1 3.3 Programmable Hysteresis Hysteresis is added to the comparators by connecting a resistor, R1, between the VREF and HYST pins and another resistor, R2, between the HYST pin and VSS. For no hysteresis, VREF should be directly connected to HYST. The hysteresis, VHB, is equal to twice the voltage difference between the VREF and HYST pins where: Comparator The TC1041 contains two comparators with programmable hysteresis. The inverting inputs of the comparators are connected to the output of the voltage reference, while the range of the non-inverting inputs extend beyond both supply voltages by 200mV. The comparator outputs will swing to within several millivolts of the supplies depending on the load current being driven. VHB = 2V REF R1/(R1 + R2) (See Figure 3-1) and is symmetrical around the normal (without hysterersis) threshold of the comparator. The maximum voltage allowed between the VREF and HYST pins is 80mV, giving a maximum hysteresis of 160mV. The comparators exhibit a propagation delay and supply current which are largely independent of supply voltage. The low input bias current and offset voltage make them suitable for high impedance precision applications. FIGURE 3-1: Voltage Reference TC1041 PROGRAMMABLE HYSTERESIS 6 VREF R1 = R1 IREF 5 R2 = HYST VHB (2) (IREF) (1.2V – VHB 2 ) IREF R2 1 VSS TC1041 Note: Size R1 and R2 such that IREF ≤ 50µA DS21346B-page 4 2002 Microchip Technology Inc. TC1041 4.0 TYPICAL APPLICATIONS The circuit in Figure 4-1 uses a TC1034, a TC1041 and only six external resistors. AMP 1 is a simple buffer while CMPTR1 and CMPTR2 provide precision voltage detection using VREF as a reference. Resistors R2 and R4 set the detection threshold for BATT LOW while Resistors R1 and R3 set the detection threshold for BATT FAIL. The component values shown assert BATT LOW at 2.2V (typical) and BATT FAIL at 2.0V (typical). Total current consumed by this circuit is typically 16µA at 3V. Resistors R5 and R6 provide hysteresis of 116mV for both comparators. The TC1041 lends itself to a wide variety of applications, particularly in battery powered systems. It typically finds application in power management, processor supervisory and interface circuitry. 4.1 Precision Battery Monitor Figure 4-1 is a precision battery low/battery dead monitoring circuit. Typically, the battery low output warns the user that a battery dead condition is imminent. Battery dead typically initiates a forced shutdown to prevent operation at low internal supply voltages (which can cause unstable system operation). FIGURE 4-1: PRECISION BATTERY MONITOR To System DC/DC Converter R4, 470k, 1% VDD VDD TC1034 + R2, 430k, 1% + AMP1 – 3V Alkaline CMPTR1 – TC1041 BATTLOW + VDD TC1041 R5 51k R6 1M R1, 300k, 1% VREF HYST – TC1041 CMPTR2 BATTFAIL + R3, 470k, 1% 2002 Microchip Technology Inc. DS21346B-page 5 TC1041 TYPICAL CHARACTERISTICS Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. Comparator Propagation Delay vs. Supply Voltage 7 TA = 25°C CL = 100pF DELAY TO FALLING EDGE (µsec) 6 Overdrive = 10mV 5 4 Overdrive = 50mV 3 2 6 Overdrive = 10mV 5 Overdrive = 100mV Overdrive = 50mV 4 3 2 2.5 3 3.5 4 4.5 5 1.5 5.5 2 6 VDD = 5V 5 VDD = 4V VDD = 2V 4 VDD = 3V 2.5 3 3.5 4 4.5 5 5.5 -40°C 2.5 2.5 TA = 25°C Overdrive = 100mV VDD = 4V VDD = 3V VDD = 2V 4 VOUT - VSS (V) VDD - VOUT (V) VDD = 5V TA = 25°C 2.0 2.0 6 85°C Comparator Output Swing vs. Output Sink Current Comparator Output Swing vs. Output Source Current 7 25°C TEMPERATURE (°C) SUPPLY VOLTAGE (V) Comparator Propagation Delay vs. Temperature 5 Overdrive = 100mV 3 SUPPLY VOLTAGE (V) DELAY TO FALLING EDGE (µsec) 7 TA = 25°C CL = 100pF 2 1.5 VDD = 3V 1.5 VDD = 1.8V 1.0 VDD = 5.5V .5 1.5 VDD = 3V 1.0 VDD = 1.8V .5 VDD = 5.5V 3 -40°C 0 0 25°C 0 85°C 3 2 4 ISOURCE (mA) 1 TEMPERATURE (°C) Comparator Output Short-Circuit Current vs. Supply Voltage 5 TA = -40°C 50 TA = 25°C 40 TA = 85°C C 0° 30 TA 20 Sinking 10 Sourcing 0 0 = -4 TA = 25°C TA = 85°C 3 1 2 4 5 SUPPLY VOLTAGE (V) DS21346B-page 6 VDD = 1.8V VDD = 3V 1.220 VDD = 5.5V Sinking 1.200 Sourcing 1.180 VDD = 5.5V 1.160 VDD = 1.8V VDD = 3V 1.140 6 0 2 4 6 1 2 3 4 5 6 ISINK (mA) 1.240 60 0 6 Reference Voltage vs. Load Current REFERENCE VOLTAGE (V) OUTPUT SHORT-CIRCUIT CURRENT (mA) Comparator Propagation Delay vs. Temperature 8 LOAD CURRENT (mA) 10 SUPPLY AND REFERENCE VOLTAGES (V) DELAY TO RISING EDGE (µsec) 7 Comparator Propagation Delay vs. Supply Voltage DELAY TO RISING EDGE (µsec) 5.0 Line Transient Response of VREF 4 VDD 3 2 VREF 1 0 0 100 200 300 400 TIME (µsec) 2002 Microchip Technology Inc. TC1041 5.0 TYPICAL CHARACTERISTICS (CONTINUED) Reference Voltage vs. Supply Voltage Supply Current vs. Supply Voltage 12 SUPPLY CURRENT (µA) REFERENCE VOLTAGE (V) 1.25 1.20 1.15 1.10 11 TA = 85°C 10 TA = -40°C 9 TA = 25°C 8 7 1.05 6 1 4 2 3 SUPPLY VOLTAGE (V) 2002 Microchip Technology Inc. 5 0 1 2 3 4 5 SUPPLY VOLTAGE (V) 6 DS21346B-page 7 TC1041 6.0 PACKAGING INFORMATION 6.1 Package Marking Information Package marking data not available at this time. 6.2 Taping Form Component Taping Orientation for 8-Pin MSOP Devices User Direction of Feed PIN 1 W P Standard Reel Component Orientation for TR Suffix Device Carrier Tape, Number of Components Per Reel and Reel Size Package 8-Pin MSOP Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 12 mm 8 mm 2500 13 in Component Taping Orientation for 8-Pin SOIC (Narrow) Devices User Direction of Feed PIN 1 W P Standard Reel Component Orientation for TR Suffix Device Carrier Tape, Number of Components Per Reel and Reel Size Package 8-Pin SOIC (N) DS21346B-page 8 Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 12 mm 8 mm 2500 13 in 2002 Microchip Technology Inc. TC1041 6.3 Package Dimensions 8-Pin MSOP PIN 1 .122 (3.10) .114 (2.90) .197 (5.00) .189 (4.80) .026 (0.65) TYP. .122 (3.10) .114 (2.90) .043 (1.10) MAX. .016 (0.40) .010 (0.25) .008 (0.20) .005 (0.13) 6° MAX. .006 (0.15) .002 (0.05) .028 (0.70) .016 (0.40) Dimensions: inches (mm) 8-Pin SOIC PIN 1 .157 (3.99) .150 (3.81) .244 (6.20) .228 (5.79) .050 (1.27) TYP. .197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) .010 (0.25) .007 (0.18) 8° MAX.. .050 (1.27) .016 (0.40) Dimensions: inches (mm) 2002 Microchip Technology Inc. DS21346B-page 9 TC1041 NOTES: DS21346B-page 10 2002 Microchip Technology Inc. TC1041 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) 792-7277 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. 2002 Microchip Technology Inc. DS21346B-page11 TC1041 NOTES: DS21346B-page12 2002 Microchip Technology Inc. TC1041 Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. 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