19-2064; Rev 0; 6/01 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators The MAX9140 are offered in tiny 5-pin SC70 and SOT23 packages. The MAX9141 and MAX9142 are available in 8-pin SOT23 and SO packages, while the MAX9144 is available in both 14-pin SO and TSSOP packages. Features ♦ Fast, 40ns Propagation Delay (10mV Overdrive) ♦ Low Power: 0.45mW Power Dissipation Per Comparator (3V) 150µA Supply Current ♦ Optimized for 3V and 5V Applications (Operation Down to 2.7V) ♦ Rail-to-Rail Input Voltage Range ♦ Low, 500µV Offset Voltage ♦ Internal Hysteresis for Clean Switching ♦ Outputs Swing 300mV of Power Rails ♦ CMOS/TTL-Compatible Outputs ♦ Output Latch (MAX9141 only) ♦ Shutdown Function (MAX9141 only) ♦ Available in SC70 and SOT23 Packages Ordering Information PART TEMP. RANGE MAX9140EXK-T -40°C to +85°C 5 SC70-5 MAX9140EUK-T -40°C to +85°C 5 SOT23-5 ADQP MAX9141EKA-T -40°C to +85°C 8 SOT23-8 AAFD MAX9141ESA -40°C to +85°C 8 SO Battery-Powered Systems MAX9142EKA-T -40°C to +85°C 8 SOT23-8 Threshold Detectors/Discriminators MAX9142ESA -40°C to +85°C 8 SO — 3V/5V Systems MAX9144EUD -40°C to +85°C 14 TSSOP — Zero-Crossing Detectors MAX9144ESD -40°C to +85°C 14 SO — Applications Line Receivers PINPACKAGE TOP MARK ACC — AAFE Sampling Circuits Pin Configurations TOP VIEW OUTA 1 OUT 1 MAX9140 5 VCC GND 2 IN+ 3 4 IN- VCC 1 IN+ MAX9141 8 N.C. OUTA 1 2 7 OUT INA- 2 IN- 3 6 SHDN INA+ 3 GND 4 5 LE GND 4 SOT23/SO MAX9142 A B SOT23/SO INA- 2 8 VCC 7 OUTB 6 INB- 5 INB+ INA+ 3 14 OUTD A VCC 4 D INB- 6 12 IND+ 11 GND MAX9144 INB+ 5 B 13 IND- C OUTB 7 10 INC+ 9 INC- 8 OUTC SC70/SOT23 TSSOP/SO Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX9140/MAX9141/MAX9142/MAX9144 General Description The MAX9140/MAX9141 are single and the MAX9142/ MAX9144 are dual/quad high-speed comparators optimized for systems powered from a 3V or 5V supply. The MAX9141 features latch enable and device shutdown. These devices combine high speed, low power, and Rail-to-Rail® inputs. Propagation delay is 40ns, while supply current is only 150µA per comparator. The input common-mode range of the MAX9140/ MAX9141/MAX9142/MAX9144 extends beyond both power-supply rails. The outputs pull to within 0.3V of either supply rail without external pullup circuitry, making these devices ideal for interface with both CMOS and TTL logic. All input and output pins can tolerate a continuous short-circuit fault condition to either rail. Internal hysteresis ensures clean output switching, even with slow-moving input signals. The MAX9140/MAX9141/MAX9142/MAX9144 are higher-speed, lower-power, and lower-cost upgrades to industry-standard comparators MAX941/MAX942/ MAX944. MAX9140/MAX9141/MAX9142/MAX9144 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators ABSOLUTE MAXIMUM RATINGS Power Supply Ranges Supply Voltage (VCC to GND)...........................................+6V Differential Input Voltage .......................-0.3V to (VCC + 0.3V) Common-Mode Input Voltage to GND ..-0.3V to (VCC + 0.3V) LE Input Voltage (MAX9141 only) .........-0.3V to (VCC + 0.3V) SHDN Input Voltage (MAX9141 only)....-0.3V to (VCC + 0.3V) Input/Output Short-Circuit Duration to VCC or GND .....................................................Continuous Continuous Power Dissipation (TA = +70°C) 5-Pin SC70 (derate 3.1mW/°C above +70°C) .............247mW 5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW 8-Pin SOT23 (derate 9.1mW/°C above +70°C)...........727mW 8-Pin SO (derate 5.9mW/°C above +70°C)..............470.6mW 14-Pin TSSOP (derate 9.1mW/°C above +70°C) ........727mW 14-Pin SO (derate 8.33mW/°C above +70°C)..........666.7mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Stresses beyond 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 beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = 5V, VCM = 0, SHDN = LE = VCC (MAX9141 only), CL = 15pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER MAX UNITS VCC (Note 2) 2.7 5.5 V Input Voltage Range VCMR (Note 3) -0.2 VCC + 0.2 V Input Offset Voltage VOS (Note 4) VHYST (Note 5) 1.5 IB (Note 6) 90 320 nA 8 120 nA Operating Supply Voltage Input Hysteresis Input Bias Current Input Offset Current SYMBOL CONDITIONS MIN TA = +25°C 0.5 TA = TMIN to TMAX 2 4.5 IOS mV mV Common-Mode Rejection Ratio CMRR VCC = 5.5V (Note 7) 80 800 µV/V Power-Supply Rejection Ratio PSRR 2.7V ≤ VCC ≤ 5.5V 80 750 µV/V Output High Voltage Output Low Voltage Output Leakage Current VCC 0.425 Supply Current (Per Comparator) ISOURCE = 4mA VOL ISINK = 4mA 0.3 0.425 V SHDN = GND, MAX9141 only (Note 8) 0.04 1 µA MAX9141 MAX9140/MAX9142/ MAX9144 MAX9141 VCM = VCC = 5V MAX9140/MAX9142/ MAX9144 MAX9141 only, SHDN = GND; VCC = VCM = 3V 165 275 150 250 200 320 165 300 12 30 ILEAK ICC Propagation Delay tPD+, tPD- Differential Propagation Delay dtPD Propagation Delay Skew µA 40 ns VOD = 10mV (Note 9) 2 ns VOD = 10mV (Note 10) 2 ns VCC/2 V VIH (Note 11) Logic Input Voltage Low VIL (Note 11) IIL, IIH V VCC = 3V, VOD = 10mV Logic Input Voltage High Logic Input Current VCC 0.3 VOH VCM = VCC = 3V 2 TYP VLOGIC = 0 to VCC (Note 11) VCC/2 + 0.4 VCC/2 2 _______________________________________________________________________________________ VCC/2 0.4 10 V µA 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators ELECTRICAL CHARACTERISTICS (continued) (VCC = 5V, VCM = 0, SHDN = LE = VCC (MAX9141 only), CL = 15pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Latch-to-Data Hold Time SYMBOL CONDITIONS MIN TYP MAX UNITS tS (Note 12) 16 ns tH (Note 12) 16 ns Latch Pulse Width tLPW (Note 12) 45 ns Latch Propagation Delay tLPD (Note 12) 60 ns Shutdown Enable Time (Note 13) 1 µs Shutdown Disable Time (Note 13) 5 µs Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: Note 10: Note 11: Note 12: Note 13: All devices are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design. Inferred from PSRR test. Inferred from CMRR test. Note also that either or both inputs can be driven to the absolute maximum limit (0.3V beyond either supply rail) without damage or false output inversion. VOS is defined as the center of the input-referred hysteresis zone. See Figure 1. The input-referred trip points are the extremities of the differential input voltage required to make the comparator output change state. The difference between the upper and lower trip points is equal to the width of the input-referred hysteresis zone. See Figure 1. The polarity of IB reverses direction as VCM approaches either supply rail. Specified over the full common-mode voltage range (VCMR). Specification is for current flowing into or out of the output pin for VOUT driven to any voltage from VCC to GND while the part is in shutdown. Specified between any two channels in the MAX9142/MAX9144. Specified as the difference between tPD+ and tPD- for any one comparator. Applies to the MAX9141 only for both SHDN and LE. Applies to the MAX9141 only. Comparator is active with LE driven high and is latched with LE driven low (VOD = 10mV). See Figure 2. Applicable to the MAX9141 only. Comparator is active with the SHDN driven high and is shutdown with SHDN driven low. Shutdown enable time is the delay when the SHDN is driven high to the time the output is valid. Shutdown disable time is the delay when the SHDN is driven low to the time the comparator shuts down. _______________________________________________________________________________________ 3 MAX9140/MAX9141/MAX9142/MAX9144 Data-to-Latch Setup Time Typical Operating Characteristics (VCC = 3.0V, VCM = 0, CL =15pF, VOD = 10mV, TA = +25°C, unless otherwise noted.) MAX9140 SUPPLY CURRENT vs. SUPPLY VOLTAGE OUTPUT LOW VOLTAGE vs. TEMPERATURE 250 MAX9140 TOC02 330 MAX9140 toc01 300 ISINK = 4mA 328 TA = +85°C TA = +25°C 150 VOL (mV) ICC (µA) 200 TA = -40°C 326 324 100 322 50 0 3 4 5 320 6 -40 20 40 60 80 100 OUTPUT SHORT-CIRCUIT (SINK) CURRENT vs. TEMPERATURE 5.10 5.05 50 MAX9140 TOC04 ISOURCE = 4mA VCC = 5.5V MAX9140 TOC03 OUTPUT HIGH VOLTAGE vs. TEMPERATURE OUTPUT SHORT-CIRCUIT SINK CURRENT (mA) 45 40 35 5.00 -40 -20 0 20 40 60 80 -40 100 -20 0 20 40 60 TEMPERATURE (°C) TEMPERATURE (°C) OUTPUT SHORT-CIRCUIT (SOURCE) CURRENT vs. TEMPERATURE INPUT BIAS CURRENT vs. TEMPERATURE 140 MAX9140 TOC05 45 120 INPUT CURRENT (nA) 35 25 80 100 MAX9140 toc06 VOH (V) 0 TEMPERATURE (°C) 5.15 100 80 60 40 20 0 15 -40 -20 0 20 40 60 TEMPERATURE (°C) 4 -20 VCC (V) 5.20 OUTPUT SHORT-CIRCUIT SOURCE CURRENT (mA) MAX9140/MAX9141/MAX9142/MAX9144 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators 80 100 -50 -25 0 25 50 75 100 TEMPERATURE (°C) _______________________________________________________________________________________ 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators INPUT OFFSET VOLTAGE vs. TEMPERATURE TRIP POINT vs. TEMPERATURE 300 0.8 0.2 VOS (mV) 0.4 100 -100 0 -0.2 -200 -0.4 -300 -0.6 -400 -0.8 -500 VTRIP- -1.0 -25 0 25 50 75 100 -50 -25 0 25 50 75 TEMPERATURE (°C) TEMPERATURE (°C) INPUT VOLTAGE RANGE vs. TEMPERATURE PROPAGATION DELAY vs. INPUT OVERDRIVE VCC = 5.5V 6 PROPAGATION DELAY (nS) VCMR+ 45 5 4 3 2 1 100 MAX9140 toc10 7 MAX9140TOC09 -50 INPUT VOLTAGE RANGE (V) VTRIP+ 0.6 200 0 MAX9140 toc08 400 VOS (µV) 1.0 MAX9140 toc07 500 40 tPD+ 35 tPD30 25 0 VCMR- -1 -20 0 20 40 60 80 0 20 40 60 80 TEMPERATURE (°C) INPUT OVERDRIVE (mV) PROPAGATION DELAY vs. TEMPERATURE PROPAGATION DELAY vs. CAPACITIVE LOAD 55 MAX9140 toc11 50 45 50 PROPAGATION DELAY (ns) PROPAGATION DELAY (ns) 20 100 tPD+ 40 tPD35 100 MAX9140 toc12 -40 tPD+ 45 40 tPD- 35 30 30 25 25 20 -50 -25 0 25 50 TEMPERATURE (°C) 75 100 15 30 45 60 75 90 105 CAPACITIVE LOAD (pF) _________________________________________________________________________________________________ 5 MAX9140/MAX9141/MAX9142/MAX9144 Typical Operating Characteristics (continued) (VCC = 3.0V, VCM = 0, CL =15pF, VOD = 10mV, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = 3.0V, VCM = 0, CL =15pF, VOD = 10mV, TA = +25°C, unless otherwise noted.) VCC = 5.5V INPUT 50mV/div INPUT 50mV/div INPUT 50mV/div OUTPUT 2V/div OUTPUT 2V/div OUTPUT 2V/div 50ns/div 10ns/div 10ns/div MAX9140TOC15 VOD = 10mV VCC = 5.5V MAX9140TOC14 VOD = 10mV VCC = 5.5V SINUSOID RESPONSE AT 4MHz PROPAGATION DELAY (tPD+) PROPAGATION DELAY (tPD-) MAX9140TOC13 MAX9140/MAX9141/MAX9142/MAX9144 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators Pin Description PIN NAME MAX9140 MAX9141 — — 1 1 OUTA Comparator A Output — — 2 2 INA- Comparator A Inverting Input — 3 3 INA+ Comparator A Noninverting Input — 6 FUNCTION MAX9142 MAX9144 5 1 8 4 VCC Positive Supply — — 5 5 INB+ Comparator B Noninverting Input — — 6 6 INB- Comparator B Inverting Input — — 7 7 OUTB Comparator B Output — — — 8 OUTC Comparator C Output — — — 9 INC- Comparator C Inverting Input — — — 10 INC+ Comparator C Noninverting Input 2 4 4 11 GND Ground — — — 12 IND+ Comparator D Noninverting Input — — — 13 IND- Comparator D Inverting Input — — — 14 OUTD 3 2 — — IN+ Noninverting Input 4 3 — — IN- Inverting Input — 6 — — ———– SHDN — 5 — — LE 1 7 — — OUT Comparator Output — 8 — — N.C. No Connection. Not internally connected. Comparator D Output ———– Shutdown: MAX9141 is active when SHDN is driven high; ———– MAX9141 is in shutdown when SHDN is driven low. The output is latched when LE is low. The latch is transparent when LE is high. _______________________________________________________________________________________ 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators Most high-speed comparators oscillate in the linear region because of noise or undesired parasitic feedback. This tends to occur when the voltage on one input is at or equal to the voltage on the other input. To counter the parasitic effects and noise, the MAX9140/ MAX9141/MAX9142/MAX9144 have an internal hysteresis of 1.5mV. The hysteresis in a comparator creates two trip points: one for the rising input voltage and one for the falling input voltage (Figure 1). The difference between the trip points is the hysteresis. The average of the trip points is the offset voltage. When the comparator’s input voltages are equal, the hysteresis effectively causes one comparator input voltage to move quickly past the other, thus taking the input out of the region where oscillation occurs. Standard comparators require hysteresis to be added with external resistors. The MAX9140/MAX9141/MAX9142/MAX9144’s fixed internal hysteresis eliminates these resistors. To increase hysteresis and noise margin even more, add positive feedback with two resistors as a voltage divider from the output to the noninverting input. Figure 1 illustrates the case where IN- is fixed and IN+ is varied. If the inputs were reversed, the figure would look the same, except the output would be inverted. The MAX9141 includes an internal latch that allows — storage of comparison results. The LE pin has a high — input impedance. If LE is high, the latch is transparent (i.e., the comparator operates as though the latch is not present). The comparator's output state is latched — when LE is pulled low (Figure 2). Shutdown Mode (MAX9141 Only) –———– The MAX9141 shuts down when the SHDN pin is low. When shut down, the supply current drops to less than 12µA, and the three-state output becomes high imped–———– ance. The S H D N pin has a high-input impedance. ———– Connect SHDN to VCC for normal operation. Exit shutdown with L—E high (transparent state); otherwise, the output will be indeterminate. VTRIP+ VHYST VIN+ V + VTRIPVOS = TRIP+ 2 VIN- = 0 VTRIP- VOH COMPARATOR OUTPUT VOL Figure 1. Input and Output Waveform, Noninverting Input Varied Input Stage Circuitry The MAX9140/MAX9141/MAX9142/MAX9144 include internal protection circuitry that prevents damage to the precision input stage from large differential input voltages. This protection circuitry consists of two back-toback diodes between IN+ and IN- as well as two series 4.1kΩ resistors (Figure 3). The diodes limit the differential voltage applied to the internal circuitry of the comparators to be no more than 2VF, where VF is the forward voltage drop of the diode (about 0.7V at +25°C). For a large differential input voltage (exceeding 2VF), this protection circuitry increases the input bias current at IN+ (source) and IN- (sink). (IN+ - IN-) - 2VF Input Current = 2 x 4.1kΩ Input current with large differential input voltages should not be confused with input bias current (IB). As long as the differential input voltage is less than 2VF, this input current is equal to IB. The output is in the correct logic state if one or both inputs are within the common-mode range. _______________________________________________________________________________________ 7 MAX9140/MAX9141/MAX9142/MAX9144 Detailed Description The MAX9140/MAX9141/MAX9142/MAX9144 singlesupply comparators feature internal hysteresis, high speed, and low power. Their outputs are pulled to within 300mV of either supply rail without external pullup or pulldown circuitry. Rail-to-rail input voltage range and low-voltage single-supply operation make these devices ideal for portable equipment. The MAX9140/MAX9141/MAX9142/MAX9144 interface directly to CMOS and TTL logic. MAX9140/MAX9141/MAX9142/MAX9144 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators tS VOS DIFFERENTIAL INPUT VOLTAGE tH VOD tLPW VCC LE VCC 2 0 VOH OUT tPD tLPD VCC 2 VOL Figure 2. MAX9141 Timing Diagram with Latch Operator Output Stage Circuitry The MAX9140/MAX9141/MAX9142/MAX9144 contain a current-driven output stage as shown in Figure 4. During an output transition, ISOURCE or ISINK is pushed or pulled to the output pin. The output source or sink current is high during the transition, creating a rapid slew rate. Once the output voltage reaches V OH or VOL, the source or sink current decreases to a small value, capable of maintaining the VOH or VOL static condition. This significant decrease in current conserves power after an output transition has occurred. One consequence of a current-driven output stage is a linear dependence between the slew rate and the load capacitance. A heavy capacitive load will slow down a voltage output transition. This can be useful in noisesensitive applications where fast edges may cause interference. 4.1kΩ IN+ TO INTERNAL CIRCUITRY MAX9140 MAX9141 MAX9142 MAX9144 TO INTERNAL CIRCUITRY IN– 4.1kΩ Applications Information Circuit Layout and Bypassing The high-gain bandwidth of the MAX9140/MAX9141/ MAX9142/MAX9144 requires design precautions to realize the full high-speed capabilities of these comparators. The recommended precautions are: 1) Use a printed circuit board with a good, unbroken, low-inductance ground plane. 2) Place a decoupling capacitor (a 0.1µF ceramic capacitor is a good choice) as close to VCC as possible. 8 Figure 3. Input Stage Circuitry 3) Pay close attention to the decoupling capacitor’s bandwidth, keeping leads short. 4) On the inputs and outputs, keep lead lengths short to avoid unwanted parasitic feedback around the comparators. 5) Solder the device directly to the printed circuit board instead of using a socket. _______________________________________________________________________________________ 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators VCC VREFC MAX9140 MAX9141 MAX9142 MAX9144 ISOURCE SERIAL DIGITAL INPUT SDI VDD 8-BIT DAC MAX512 OUTPUT DACOUTC GND VSS MAX9140 ISINK GND ANALOG IN Figure 4. Output Stage Circuitry Figure 5. 3.3V Digitally Controlled Threshold Detector Chip Information MAX9140 TRANSISTOR COUNT: 158 MAX9141 TRANSISTOR COUNT: 192 VCC = 3V MAX9142 TRANSISTOR COUNT: 314 MAX9144 TRANSISTOR COUNT: 620 PROCESS: Bipolar 10kΩ 3V COAX LINE 20kΩ MAX9140 0 CLEAN DIGITAL SIGNAL 20kΩ Figure 6. Line Receiver Application _______________________________________________________________________________________ 9 MAX9140/MAX9141/MAX9142/MAX9144 VDD = 3.3V SOT23, 8L.EPS ________________________________________________________Package Information SOT5L.EPS MAX9140/MAX9141/MAX9142/MAX9144 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators 10 ______________________________________________________________________________________ 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators SC70, 5L.EPS TSSOP.EPS ______________________________________________________________________________________ 11 MAX9140/MAX9141/MAX9142/MAX9144 ___________________________________________Package Information (continued) ___________________________________________Package Information (continued) SOICN.EPS MAX9140/MAX9141/MAX9142/MAX9144 40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.