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MIC7211/7221
Micrel
MIC7211/7221
IttyBittyTM Rail-to-Rail Input Comparator Preliminary Information
General Description
The MIC7211 and MIC7221 are micropower comparators featuring rail-to-rail input performance in Micrel's IttyBittyTM SOT-23-5 package. The MIC7211/21 is ideal for systems where small size is a critical consideration. The MIC7211/21 is optimized for single supply operation from 2.2V to 10V power supplies. The MIC7211 features a conventional push-pull output while the MIC7221 has an open-drain output for mixed-voltage applications with an external pull-up resistor. The MIC7211/21 benefits small battery-operated portable electronic devices where small size and the ability to place the comparator close to the signal source are primary design concerns.
Features
* * * * * * * * Small footprint SOT-23-5 package Guaranteed performance at 2.2V, 2.7V, 5V, and 10V 7A typical supply current at 5V <5s response time at 5V Push-pull output (MIC7211) Open-drain output (MIC7221) Input voltage range may exceed supply voltage by 0.3V >100mA typical sink or source
Applications
* * * * * * Battery-powered products Notebook computers and PDAs PCMCIA cards Cellular and other wireless communication devices Alarm and security circuits Direct sensor interface
Ordering Information
Part Number MIC7211BM5 MIC7221BM5 Temp. Range -40C to +85C -40C to +85C Package SOT-23-5 SOT-23-5 Mark A14 A15
Pin Configuration
IN+
3
Functional Configuration
IN+ V+ OUT
2 1 1
V+ OUT
2
Part Identification
3
Axx
4 5 4 5
IN-
V-
IN-
V-
SOT-23-5 (M5)
Pin Description
Pin Number 1 2 3 4 5 Pin Name OUT V+ IN+ IN- V- Pin Function Amplifier Output Positive Supply Noninverting Input Inverting Input Negative Suppy
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
June 1999
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Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (VV+ - VV-) ........................................... 12V Differential Input Voltage (VIN+, VIN-) ............. (VV+ - VV-) I/O Pin Voltage (VIN+, VOUT), Note 3 .................................. ............................................ VV+ + 0.3V to VV- - 0.3V Junction Temperature (TJ) ...................................... +150C Storage Temperature (TS) ....................... -65C to +150C ESD, Note 6
Operating Ratings (Note 2)
Supply Voltage (VV+ - VV-) .............................. 2.2V to 10V Junction Temperature (TJ) ......................... -40C to +85C Maximum Junction Temperature (TJ(max)) Note 4 . +125C Package Thermal Resistance (JA) Note 5 .......... 325C/W Maximum Power Dissipation .................................... Note 4
DC Electrical Characteristics (2.2V)
VV+ = +2.2V, VV- = 0V, VCM = VOUT = VV+/2; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol VOS TCVOS TCVOS IB IOS CMRR PSRR AVOL VOH VOL IS Parameter Input Offset Voltage Input Offset Voltage Temperature Drift Input Offset Voltage Drift Over Time Input Bias Current Input Offset Current Common-Mode Rejection Ratio Positive Power Supply Rejection Ratio Gain Output Voltage (High) Output Voltage (Low) Supply Current MIC7211, ILOAD = 2.5mA ILOAD = 2.5mA VOUT = low 2.1 0V VCM 2.2V VV+ = 2.2V to 5V Condition Min Typ 2 1 3.3 0.5 0.25 60 90 125 2.18 0.02 5 0.1 12 Max 10 Units mV V/C
Vmonth
pA pA dB dB dB V V A
DC Electrical Characteristics (2.7V)
VV+ = +2.7V, VV- = 0V, VCM = VOUT = VV+/2; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol VOS TCVOS TCVOS IB IOS CMRR PSRR AVOL VOH VOL IS Parameter Input Offset Voltage Input Offset Voltage Temperature Drift Input Offset Voltage Drift Over Time Input Bias Current Input Offset Current Common-Mode Rejection Ratio Positive Power Supply Rejection Ratio Gain Output Voltage (High) Output Voltage (Low) Supply Current MIC7211, ILOAD = 2.5mA ILOAD = 2.5mA VOUT = low 2.6 0V VCM 2.7V VV+ = 2.7V to 5V Condition Min Typ 2 1 3.3 0.5 0.25 65 90 125 2.68 0.02 5 0.1 12 Max 10 Units mV V/C
Vmonth
pA pA dB dB dB V V A
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DC Electrical Characteristics (5V)
VV+ = +5.0V, VV- = 0V, VCM = VOUT = VV+/2; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol VOS TCVOS TCVOS IB IOS CMRR PSRR AVOL VOH VOL IS ISC Parameter Input Offset Voltage Input Offset Voltage Temperature Drift Input Offset Voltage Drift Over Time Input Bias Current Input Offset Current Common-Mode Rejection Ratio Positive Power Supply Rejection Ratio Gain Output Voltage (High) Output Voltage (Low) Supply Current Short Circuit Current MIC7211, ILOAD = 5mA ILOAD = 5mA VOUT = low MIC7211, sourcing sinking 4.9 0V VCM 5.0V VV+ = 5.0V to 10V Condition Min Typ 2 1 3.3 0.5 0.25 70 90 125 4.95 0.05 7 150 110 0.1 14 Max 10 Units mV V/C
Vmonth
pA pA dB dB dB V V A mA mA
DC Electrical Characteristics (10V)
VV+ = +10V, VV- = 0V, VCM = VOUT = VV+/2; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol VOS TCVOS TCVOS IB IOS CMRR PSRR AVOL VOH VOL IS ISC Parameter Input Offset Voltage Input Offset Voltage Temperature Drift Input Offset Voltage Drift Over Time Input Bias Current Input Offset Current Common-Mode Rejection Ratio Positive Power Supply Rejection Ratio Gain Output Voltage (High) Output Voltage (Low) Supply Current Short Circuit Current MIC7211, ILOAD = 5mA ILOAD = 5mA VOUT = low MIC7211, sourcing sinking 9.9 0V VCM 10V VV+ = 5.0V to 10V Condition Min Typ 2 1 3.3 0.5 0.25 75 90 125 9.95 0.05 12 165 125 0.1 25 Max 10 Units mV V/C
Vmonth
pA pA dB dB dB V V A mA mA
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AC Electrical Characteristics
VV- = 0V, VCM = VOUT = VV+/2; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol tRISE tFALL tPHL Parameter Rise Time Fall Time Propagation Delay-High to Low Condition VV+ = 5.0V, f = 10kHz, CLOAD = 50pF overdrive = 10mV, Note 9 VV+ = 5.0V, f = 10kHz, CLOAD = 50pF overdrive = 10mV, Note 9 VV+ = 2.2V, f = 10kHz, CLOAD = 50pF overdrive = 10mV, Note 9 VV+ = 2.2V, f = 10kHz, CLOAD = 50pF overdrive = 100mV, Note 9 VV+ = 5.0V, f = 10kHz, CLOAD = 50pF overdrive = 10mV, Note 9 VV+ = 5.0V, f = 10kHz, CLOAD = 50pF overdrive = 100mV, Note 9 tPLH Propagation Delay-Low to High VV+ = 2.2V, f = 10kHz, CLOAD = 50pF overdrive = 10mV, Note 9 VV+ = 2.2V, f = 10kHz, CLOAD = 50pF overdrive = 100mV, Note 9 VV+ = 5.0V, f = 10kHz, CLOAD = 50pF overdrive = 10mV, Note 9 VV+ = 5.0V, f = 10kHz, CLOAD = 50pF overdrive = 100mV, Note 9
Note 1. Note 2. Note 3. Note 4. Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. I/O pin voltage is any external voltage to which an input or output is referenced. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(max); the junction-to-ambient thermal resistance, JA; and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using PD(max) = (TJ(max) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature. Thermal resistance, JA, applies to a part soldered on a printed circuit board. Devices are ESD sensitive. Handling precautions recommended. All limits guaranteed by testing on statistical analysis. Continuous short circuit may exceed absolute maximum TJ under some conditions. The MIC7221 requires 5k pull-up resistor.
Min
Typ 75 70 10 6.0 13 5 13.5 4.0 11.5 3.0
Max
Units ns ns s s s s s s s s
Note 5. Note 6. Note 7. Note 8. Note 9.
Partial Functional Diagrams
V+ V+
OUT
OUT
V-
V-
MIC7211 Push-Pull Output
MIC7221 Open-Drain Output
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to swing the input beyond either rail facilitates some otherwise difficult circuits, such as a single-supply zero-crossing detector or a circuit that senses its own supply voltage. The comparator must be powered if an input is pulled above the rail, even with current limiting in effect. Figure 2 shows a hypothetical situation where an input is pulled higher than the rail when the power supply is off or not present. Figure 2 also shows external clamp diodes for additional input circuit protection. Discrete clamp diodes can be arbitrarily more robust than the internal clamp diodes. The power supply has been simplified (real power supplies do not have a series output diode); however, this illustrates a common characteristic of most positive-voltage power supplies: they are designed to source, but not sink, current. If the supply is off, or disconnected, there is no limiting voltage for the clamp diode to reference. The input signal can charge the the bypass capacitor, and possibly the filter capacitor, up to the applied input (VIN). This may be high enough to cause a thin-oxide rupture in a CMOS integrated circuit.
0V WHEN SUPPLY IS OFF POSSIBLE DISCONNECT
Application Information
The small outline and low supply current (typically 7A at 5V) of the MIC7211/21 are the primary advantages of these comparators. They have been characterized for 2.2V, 2.7V, 5V, and 10V operation. Their 2.2V capability is especially useful in low-battery voltage situations. Low-voltage operation allows longer battery life or deeper discharge capability. Even at 2.2V, the output can drive several logic-gate inputs. At 2.5mA, the output stage voltage drop is guaranteed to not exceed 0.1V. Outputs The MIC7211 has a push-pull output while the MIC7221 has an open-drain output, otherwise both comparators share a common design. The open-drain MIC7221 output can be pulled up to 10V, even when the supply voltage is as low as 2.2V. Conversely, the output also can be pulled up to voltages that are lower than the positive supply. Logic-level translation is readily facilitated by the ability to pull the open-drain output to voltages above or below the power supply. Although specified short-circuit output current specified for these parts typically exceeds 100mA, their output is not intended to sink or source anywhere near 100mA. The shortcircuit rating is only presented as additional information regarding output impedance and may be useful for determining the voltage drop one may experience when driving a given load. Input Bias Current The low input-bias current (typically 0.5pA) requirement of the MIC7211/21 provides flexibility in the kinds of circuitry and devices that can be directly interfaced. Designs using an amplifier for transducer-to-comparator impedance transformation may be simplified by using the MIC7211/21's low-input-current requirement to eliminate the amplifier. Input Signal Levels Input signals may exceed either supply rail by up to 0.2V without phase inversion or other adverse effects. The inputs have internal clamp diodes to the supply pins.
V+
V++ V+
Power Supply Output
0.1F
VIN (>>V+) RIN RPU
VREF Note: 1V V++ 10V
R1
RF
VOUT
Figure 2. Avoid This Condition Ideally, the supply for the comparator and the input-producing circuitry should the same or be switched simultaneously. Bypass Capacitors CMOS circuits, especially logic gates with their totem-pole (push-pull) output stages, generate power supply current spikes (noise) on the supply and/or ground lines. These spikes occur because, for a finite time during switching, both output transistors are partially on allowing "shoot-through current." Bypass capacitors reduce this noise. Adequate bypassing for the MIC7211 comparator is 0.01F; in low-noise systems, where this noise may interfere with the functioning or accuracy of nearby circuitry, 0.1F is recommended. Because the MIC7221 does not have a totem-pole output stage, this spiking is not evident; however, switching a capacitive load can present a similar situation. Thermal Behavior The thermal impedance of a SOT-23-5 package is 325C/W. The 5V Electrical Characteristics table shows a maximum voltage drop of 0.1V for a 5mA output current, making the output resistance about 20 (R = 0.1/0.005 = 20). Attempting to draw the typical specified output short-circuit current of 150mA (sourcing) can be expected to cause a die temperature rise of 146C. (Operating die temperature for ICs should generally not exceed 125C.) Using a series resistance is the simplest form of protecting against damage by excessive output current.
RIN VIN (100V)
0.1F
100k
VREF
R1
RF
VOUT
Note: RF and R1 control hysteresis (typically, RF >> R1).
Figure 1. Driving the Input Beyond the Supply Rails Larger input swings can be accommodated if the input current is limited to 1mA or less. Using a 100k input resistor will allow an input to swing up to 100V beyond either supply rail. Because of the low input bias current of the device, even larger input resistors are practical. See Figure 1. The ability June 1999 5
MIC7211/7221
MIC7211/7221
Micrel
Package Information
1.90 (0.075) REF 0.95 (0.037) REF
1.75 (0.069) 1.50 (0.059)
3.00 (0.118) 2.60 (0.102)
DIMENSIONS: MM (INCH) 3.02 (0.119) 2.80 (0.110) 1.30 (0.051) 0.90 (0.035) 10 0 0.15 (0.006) 0.00 (0.000) 0.20 (0.008) 0.09 (0.004)
0.50 (0.020) 0.35 (0.014)
0.60 (0.024) 0.10 (0.004)
SOT-23-5 (M5)
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Micrel
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Micrel
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
WEB
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 1999 Micrel Incorporated
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