Not Recommended for New Designs The MAX909 was manufactured for Maxim by an outside wafer foundry using a process that is no longer available. It is not recommended for new designs. A Maxim replacement or an industry second-source may be available. The data sheet remains available for existing users. The other parts on the following data sheet are not affected. For further information, please see the QuickView data sheet for this part or contact technical support for assistance. 19-0129; Rev 7; 1/06 Dual/Quad/Single, High-Speed, Ultra-Low-Power, Single-Supply TTL Comparators The MAX907/MAX908/MAX909 are dual/quad/single, high-speed, ultra-low-power voltage comparators designed for use in systems powered from a single +5V supply; the MAX909 also accepts dual 5V supplies. Their 40ns propagation delay (with 5mV input overdrive) is achieved with a power consumption of only 3.5mW per comparator. The wide input commonmode range extends from 200mV below ground (below the negative supply rail for the MAX909) to within 1.5V of the positive supply rail. Because they are micropower, high-speed comparators that operate from a single +5V supply and include built-in hysteresis, these devices replace a variety of older comparators in a wide range of applications. MAX907/MAX908/MAX909 outputs are TTL-compatible, requiring no external pullup circuitry. All inputs and outputs can be continuously shorted to either supply rail without damage. These easy-to-use comparators incorporate internal hysteresis to ensure clean output switching even when the devices are driven by a slow-moving input signal. The MAX909 features complementary outputs and an output latch. A separate supply pin for extending the analog input range down to -5V is also provided. The dual MAX907 and single MAX909 are available in 8-pin DIP and SO packages, and the quad MAX908 is available in 14-pin DIP and SO packages. These comparators are ideal for single +5V-supply applications that require the combination of high speed, precision, and ultra-low power dissipation. Features 40ns Propagation Delay 700A (3.5mW) Supply Current per Comparator Single 4.5V to 5.5V Supply Operation (or 5V, MAX909 only) Wide Input Range Includes Ground (or -5V, MAX909 only) Low, 500V Offset Voltage Internal Hysteresis Provides Clean Switching TTL-Compatible Outputs (Complementary on MAX909) Input and Output Short-Circuit Protection Internal Latch (MAX909 only) Ordering Information PART TEMP RANGE PIN-PACKAGE 0C to +70C 8 Plastic DIP MAX907CSA 0C to +70C 8 SO MAX907EPA -40C to +85C 8 Plastic DIP MAX907ESA -40C to +85C 8 SO MAX907MSA/PR* -55C to +125C 8 SO MAX907CPA Ordering Information continued at end of data sheet. *Go to www.maxim-ic.com/PR-1 for details on high-reliability plastic processing. Pin Configurations TOP VIEW OUTA 1 8 V+ INA- 2 7 OUTB Battery-Powered Systems INA+ 3 6 INB- High-Speed A/D Converters GND 4 5 INB+ Applications High-Speed V/F Converters DIP/SO Line Receivers Threshold Detectors/Discriminators MAX907 OUTA 1 14 OUTD High-Speed Sampling Circuits INA- 2 13 IND- Zero-Crossing Detectors INA+ 3 12 IND+ V+ 4 INB+ MAX908 5 11 GND 10 INC+ INB- 6 9 INC- OUTB 7 8 OUTC DIP/SO Pin Configurations continued at end of data sheet. ________________________________________________________________ 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 MAX907/MAX908/MAX909 General Description MAX907/MAX908/MAX909 Dual/Quad/Single, High-Speed, Ultra-Low-Power, Single-Supply TTL Comparators ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation (TA = +70C) 8-Pin Plastic DIP (derate 9.09mW/C above +70C) . . . 727mW 8-Pin SO (derate 5.88mW/C above +70C) . . . . . . . . . . . 471mW 14-Pin Plastic DIP (derate 10.00mW/C above +70C) . . . 800mW 14-Pin SO (derate 8.33mW/C above +70C) . . . . . . . . . . 667mW Operating Temperature Ranges: MAX90_C_ _ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to +70C MAX90_E_ _ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40C to +85C MAX907MSA/PR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55C to +125C Storage Temperature Range . . . . . . . . . . . . . . . . . . . -65C to +150C Lead Temperature (soldering, 10s) . . . . . . . . . . . . . . . . . . . . . . +300C Positive Supply Voltage (V+ to GND) . . . . . . . . . . . . . . . . . . . . . . . . +6V Negative Supply Voltage (V- to GND, MAX909 only) . . . . . . . . . -7V Differential Input Voltage MAX907/MAX908 . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (V+ + 0.3V) MAX909 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (V- - 0.3V) to (V+ + 0.3V) Common-Mode Input Voltage MAX907/MAX908 . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (V+ + 0.3V) MAX909 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (V- - 0.3V) to (V+ + 0.3V) Latch Input Voltage (MAX909 only) . . . . . . . . . -0.3V to (V+ + 0.3V) Input/Output Short-Circuit Duration to V+ or GND . . . Continuous 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 (V+ = 5V, TA = +25C; MAX909 only: V- = 0V, VLATCH = 0V; unless otherwise noted.) SYMBOL VTRIP+ TYP MAX UNITS Positive Trip Point PARAMETER (Note 1) 2 4 mV Negative Trip Point VTRIP- (Note 1) -2 -4 mV Input Offset Voltage VOS 0.5 2.0 mV Input Bias Current IB (Note 2) VCM = 0V, VIN = VOS 100 300 nA Input Offset Current IOS VCM = 0V, VIN = VOS 25 50 nA Input Voltage Range VCMR CONDITIONS (Notes 3, 4) MIN MAX907/MAX908/MAX909 -0.2 V+ - 1.5 MAX909 only: V- = -5V V+ - 1.5 -5.2 V Common-Mode Rejection Ratio CMRR (Notes 4, 5) 50 150 V/V Power-Supply Rejection Ratio PSRR VOH (Notes 4, 6) ISOURCE = 100A 50 200 V/V Output High Voltage Output Low Voltage VOL 3.0 3.5 ISINK = 3.2mA 0.36 ISINK = 8mA 0.4 V 0.475 Positive Supply Current per Comparator I+ (Note 7) MAX907/MAX908 0.7 1.0 MAX909 1.2 1.8 Negative Supply Current I- MAX909 only: V- = -5V 60 100 3.5 5.5 6 10 Power Dissipation per Comparator PD (Note 8) MAX907/MAX908 Output Rise Time tr MAX909 VOUT = 0.4V to 2.4V, CL = 10pF Output Fall Time tf VOUT = 2.4V to 0.4V, CL = 10pF 2 V mA A mW 12 ns 6 ns _______________________________________________________________________________________ Dual/Quad/Single, High-Speed, Ultra-Low-Power, Single-Supply TTL Comparators MAX907/MAX908/MAX909 ELECTRICAL CHARACTERISTICS (continued) (V+ = 5V, TA = +25C; MAX909 only: V- = 0V, VLATCH = 0V; unless otherwise noted.) PARAMETER Propagation Delay SYMBOL TYP MAX UNITS tPD+, tPD- VIN = 100mV, VOD = 5mV (Note 9) 40 50 ns tPD VIN = 100mV, VOD = 5mV (Note 10) 1 ns MAX909 only: VIN = 100mV, VOD = 5mV (Note 11) 2 ns Differential Propagation Delay CONDITIONS MIN Propagation Delay Skew tPDskew Latch Input Voltage High VIH (Note 12) Latch Input Voltage Low VIL (Note 12) 0.8 V IIH, IIL (Note 12) 20 A Latch Setup Time ts (Note 12) 2 ns Latch Hold Time th (Note 12) 2 ns Latch Input Current 2.0 V ELECTRICAL CHARACTERISTICS (V+ = 5V, TA = TMIN to TMAX; MAX909 only: V- = 0V, VLATCH = 0V; unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Positive Trip Point VTRIP+ (Note 1) 2 5 mV Negative Trip Point VTRIP- (Note 1) -2 -5 mV Input Offset Voltage VOS (Note 2) 1 3.5 mV Input Bias Current Input Offset Current Input Voltage Range IB VCM = 0V, VIN = VOS 200 500 nA IOS VCM = 0V, VIN = VOS 50 100 nA VCMR C/E temp. ranges (Notes 3, 4) M temp. range (Notes 3, 4) MAX907/MAX908/MAX909 -0.2 V+ - 1.5 MAX909 only, V- = -5V -5.2 V+ - 1.5 MAX907MSA/PR -0.1 V+ - 1.5 V Common-Mode Rejection Ratio CMRR (Notes 4, 5) 75 300 V/V Power-Supply Rejection Ratio PSRR (Notes 4, 6) 75 400 V/V Output High Voltage Output Low Voltage VOH VOL ISOURCE = 100A ISINK = 3.2mA 2.8 3.5 0.45 TMIN = 0C 0.525 TMIN = -40C Positive Supply Current per Comparator I+ (Note 7) Negative Supply Current I- MAX909 only; V- = -5V Power Dissipation per Comparator PD (Note 8) V TA = TMAX V 0.550 MAX907/MAX908 0.8 1.2 MAX909 1.2 2.0 100 200 MAX907/MAX908 4 7 MAX909 6 11 mA V mW _______________________________________________________________________________________ 3 MAX907/MAX908/MAX909 Dual/Quad/Single, High-Speed, Ultra-Low-Power, Single-Supply TTL Comparators ELECTRICAL CHARACTERISTICS (continued) (V+ = 5V, TA = TMIN to TMAX; MAX909 only: V- = 0V, VLATCH = 0V; unless otherwise noted.) PARAMETER Propagation Delay Differential Propagation Delay SYMBOL CONDITIONS MIN TYP MAX UNITS 70 ns tPD+, tPD- VIN = 100mV, VOD = 5mV (Note 9) 45 tPD VIN = 100mV, VOD = 5mV (Note 10) 2 ns MAX909 only: VIN = 100mV, VOD = 5mV (Note 11) 4 ns Propagation Delay Skew tPDskew Latch Input Voltage High VIH (Note 12) Latch Input Voltage Low VIL (Note 12) 2.0 V 0.8 V 20 A IIH, IIL (Note 12) Latch Setup Time ts (Note 12) 4 ns Latch Hold Time th (Note 12) 4 ns Latch Input Current Trip Point is defined as the input voltage required to make the comparator output change state. The difference between upper (VTRIP+) and lower (VTRIP-) trip points is equal to the width of the input-referred hysteresis zone (VHYST). Specified for an input common-mode voltage (VCM) of 0V (see Figure 1). Note 2: Input Offset Voltage is defined as the center of the input-referred hysteresis zone. Specified for VCM = 0V (see Figure 1). Note 3: Inferred from the CMRR test. Note that a correct logic result is obtained at the output, provided that at least one input is within the VCMR limits. Note also that either or both inputs can be driven to the upper or lower absolute maximum limit without damage to the part. Note 4: Tested with V+ = 5.5V (and V- = 0V for MAX909). MAX909 also tested over the full analog input range (i.e., with V- = -5.5V). Note 5: Tested over the full input voltage range (VCMR). Note 6: Specified over the full tolerance of operating supply voltage: MAX907/MAX908 tested with 4.5V < V+ < 5.5V. MAX909 tested with 4.5V < V+ < 5.5V and with -5.5V < V- < 0V. Note 7: Positive Supply Current specified with the worst-case condition of all outputs at logic low (MAX907/MAX908), and with V+ = 5.5V. Note 8: Typical power specified with V+ = 5V; maximum with V+ = 5.5V (and with V- = -5.5V for MAX909). Note 9: Due to difficulties in measuring propagation delay with 5mV of overdrive in automatic test equipment, this parameter is guaranteed by design for the MAX907 and MAX908. Correlation tests show that the specification can be guaranteed if all other DC parameters are within the specified limits. VOS must be added to the overdrive voltage for low values of overdrive. For the MAX909, propagation delay is typical only and there is no guaranteed maximum limit. Note 10: Differential Propagation Delay is specified as the difference between any two channels in the MAX907/MAX908 (both outputs making either a low-to-high or a high-to-low transition). Note 11: Propagation Delay Skew is specified as the difference between any single channel's output low-to-high transition (tPD+) and high-to-low transition (tPD-), and also between the QOUT and QOUT transition on the MAX909. Note 12: Latch specifications apply to MAX909 only (see Figure 2). Note 1: 4 _______________________________________________________________________________________ Dual/Quad/Single, High-Speed, Ultra-Low-Power, Single-Supply TTL Comparators (V+ = 5V, TA = +25C, unless otherwise noted.) PROPAGATION DELAY vs. SOURCE IMPEDANCE 40 tPD+ tPD- 30 20 10 10 60 tPD+ tPD40 20 100 60 tPD+ 50 tPD- 40 100 10k 1k 0 20 40 60 80 100 SOURCE IMPEDANCE () CAPACITIVE LOAD (pF) PROPAGATION DELAY vs. TEMPERATURE OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT OUTPUT LOW VOLTAGE vs. SINK CURRENT 0.5 MAX907 TOC05 5.0 VIN = 100mV 4.5 tPD+ tPD- 50 40 TA = +125C 4.0 TA = +25C TA = +125C 0.1 1 20 40 60 80 100 120 140 0.3 0.2 3.0 -60 -40 -20 0 TA = -55C TA = +25C TA = -55C 3.5 30 VIN = 100mV 0.4 VOL (V) VOH (V) 60 120 MAX907 TOC06 INPUT OVERDRIVE (mV) VOD = 5mV RS = 10 CLOAD = 15pF 10 1000 100 0 2 4 6 8 10 TEMPERATURE (C) ISOURCE (A) ISINK (mA) MAX907 TOTAL POSITIVE SUPPLY CURRENT vs. POSITIVE SUPPLY VOLTAGE (OUTPUTS AT VOL) MAX907 TOTAL POSITIVE SUPPLY CURRENT vs. POSITIVE SUPPLY VOLTAGE (OUTPUTS AT VOH) MAX908 TOTAL POSITIVE SUPPLY CURRENT vs. POSITIVE SUPPLY VOLTAGE (OUTPUTS AT VOL) TOTAL ICC (mA) TA = +25C 1.0 TA = -55C TA = -55C 0.5 0.5 3 4 5 VCC (V) 6 7 8 TA = +25C 2.0 TA = -55C 1.0 0 0 TA = +125C 3.0 TA = +25C 1.0 MAX907 TOC09 TA = +125C 1.5 TOTAL ICC (mA) TA = +125C 1.5 12 4.0 MAX907 TOC08 2.0 MAX907 TOC07 2.0 2 VOD = 5mV RS = 10 30 10 MAX907 TOC04 70 PROPAGATION DELAY (ns) 70 0 1 TOTAL ICC (mA) VOD = 5mV CLOAD = 15pF MAX907 TOC03 80 PROPAGATION DELAY (ns) RS = 10 CLOAD = 15pF PROPAGATION DELAY (ns) MAX907 TOC01 PROPAGATION DELAY (ns) 50 PROPAGATION DELAY vs. CAPACITIVE LOAD MAX907 TOC2 PROPAGATION DELAY vs. INPUT OVERDRIVE 0 2 3 4 5 VCC (V) 6 7 8 2 3 4 5 6 7 8 VCC (V) _________________________________________________________________________________________________ 5 MAX907/MAX908/MAX909 Typical Operating Characteristics Typical Operating Characteristics (continued) (V+ = 5V, TA = +25C, unless otherwise noted.) V- = -5V TA = +125C TA = +25C TOTAL I+ (mA) TOTAL ICC (mA) 3.0 TA = -55C V+ = +5V TA = +125C TOTAL I- (A) TA = +125C 200 MAX907 TOC11 2.0 MAX907 TOC10 4.0 2.0 MAX909 NEGATIVE SUPPLY CURRENT vs. NEGATIVE SUPPLY VOLTAGE MAX909 POSITIVE SUPPLY CURRENT vs. POSITIVE SUPPLY VOLTAGE MAX907 TOC12 MAX908 TOTAL POSITIVE SUPPLY CURRENT vs. POSITIVE SUPPLY VOLTAGE (OUTPUTS AT VOH) TA = +25C 1.0 TA = -55C 100 TA = +25C 1.0 TA = -55C 3 4 5 6 7 2 8 3 4 5 6 7 0 8 -2 -3 -4 -5 -6 INPUT VOLTAGE RANGE vs. TEMPERATURE MAX909 INPUT VOLTAGE RANGE vs. TEMPERATURE SHORT-CIRCUIT OUTPUT CURRENT vs. TEMPERATURE 4 0 VCMR- MAX907 TOC14 5 VCMR+ INPUT VOLTAGE RANGE (V) VCMR+ 4 V+ = +5V V- = -5V -5 VCMR-6 -1 -60 -40 -20 0 60 OUTPUT SHORTED TO V+ (SINKING) 30 OUTPUT SHORTED TO GND (SOURCING) 0 -60 -40 -20 0 20 40 60 80 100 120 140 20 40 60 80 100 120 140 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C) TEMPERATURE (C) INPUT OFFSET VOLTAGE vs. TEMPERATURE INPUT BIAS CURRENT vs. TEMPERATURE TRIP POINT vs. TEMPERATURE VCM = 0V VIN = VOS -0.5 200 20 40 60 80 100 120 140 TEMPERATURE (C) VTRIP+ 0 VTRIP-2 100 -60 -40 -20 0 VCM = 0V 2 VOS (mV) INPUT CURRENT (nA) 0 4 MAX907 TOC17 300 MAX907 TOC16 VOUT = 1.4V VCM = 0V MAX907 TOC18 TEMPERATURE (C) 0.5 -7 MAX907 TOC15 V- (V) SHORT-CIRCUIT OUTPUT CURRENT (mA) V+ (V) 5 6 -1 VCC (V) MAX907 TOC13 2 INPUT VOLTAGE RANGE (V) 0 0 0 VOS (mV) MAX907/MAX908/MAX909 Dual/Quad/Single, High-Speed, Ultra-Low-Power, Single-Supply TTL Comparators -4 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C) -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C) ________________________________________________________________________________________________ Dual/Quad/Single, High-Speed, Ultra-Low-Power, Single-Supply TTL Comparators (V+ = 5V, TA = +25C, unless otherwise noted.) MAX907/MAX908 PROPAGATION DELAY (tPD+) (5mV OVERDRIVE) MAX907/MAX908 PROPAGATION DELAY (tPD-) (5mV OVERDRIVE) MAX907 TOC20 MAX907 TOC19 5mV OVERDRIVE INPUT GND INPUT 20mV/div INPUT GND -5mV OVERDRIVE INPUT 20mV/div OUTPUT 500mV/div OUTPUT 500mV/div TTL THRESHOLD (1.4V) TTL THRESHOLD (1.4V) OUTPUT GND OUTPUT GND tPD+ tPD- 10ns/div 10ns/div MAX909 PROPAGATION DELAY (tPD-) (5mV OVERDRIVE) MAX909 PROPAGATION DELAY (tPD+) (5mV OVERDRIVE) MAX907 TOC21 MAX907 TOC22 5mV OVERDRIVE INPUT GND INPUT 20mV/div INPUT GND -5mV OVERDRIVE INPUT 20mV/div QOUT 1V/div QOUT 1V/div 1.4V OUTPUT GND 1.4V QOUT tPD+ OUTPUT GND QOUT tPD- tPD SKEW tPD SKEW 10ns/div 10ns/div MAX907 TOC23 RESPONSE TO 10MHz SINE WAVE 20mVP-P 10MHz SINE WAVE INPUT COMPARATOR OUTPUT 1V/div GND 50ns/div _________________________________________________________________________________________________ 7 MAX907/MAX908/MAX909 Typical Operating Characteristics (continued) MAX907/MAX908/MAX909 Dual/Quad/Single, High-Speed, Ultra-Low-Power, Single-Supply TTL Comparators Pin Description PIN NAME FUNCTION MAX907 MAX908 MAX909 1 1 -- OUTA 2 2 -- INA- Comparator A Inverting Input 3 3 -- INA+ Comparator A Noninverting Input 4 11 6 GND Ground 5 5 -- INB+ Comparator B Noninverting Input 6 6 -- INB- Comparator B Inverting Input 7 7 -- OUTB 8 4 1 V+ -- 8 -- OUTC -- 9 -- INC- Comparator C Inverting Input -- 10 -- INC+ Comparator C Noninverting Input -- 12 -- IND+ Comparator D Noninverting Input -- 13 -- IND- Comparator D Inverting Input -- 14 -- OUTD -- -- 2 IN+ Noninverting Input -- -- 3 IN- Inverting Input -- -- 4 V- Negative Supply or Ground -- -- 5 LE The latch is transparent when LE is low. The comparator output is stored when LE is high. -- -- 7 QOUT Comparator Output -- -- 8 QOUT Inverted Comparator Output Comparator A Output Comparator B Output Positive Supply Comparator C Output Comparator D Output Detailed Description Timing Noise or undesired parasitic AC feedback cause most high-speed comparators to oscillate in the linear region (i.e., when the voltage on one input is at or near the voltage on the other input). The MAX907/MAX908/ MAX909 eliminate this problem by incorporating internal hysteresis. When the two comparator input voltages are equal, 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 that hysteresis be added through the use of external resistors. The MAX907/MAX908/MAX909's fixed internal hysteresis eliminates these resistors (and the equations required to determine appropriate values). 8 Adding hysteresis to a comparator creates two trip points: one for the input voltage rising and one for the input voltage falling (Figure 1). The difference between these two input-referred trip points is the hysteresis. 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 MAX909 includes an internal latch, allowing the result of a comparison to be stored. If LE is low, the latch is transparent (i.e., the comparator operates as though the latch is not present). The state of the comparator output is stored when LE is high (Figure 2). Note that the MAX909 can be operated with V- connected to ground or to a negative supply voltage. The MAX909's input range extends from (V- - 0.2V) to (V+ - 1.5V). _______________________________________________________________________________________ Dual/Quad/Single, High-Speed, Ultra-Low-Power, Single-Supply TTL Comparators VHYST VOS = VTRIP- LATCH 3V VIN+ VTRIP+ + VTRIP2 LE 1.4V 0V VIN- = 0V VOS VOH COMPARATOR OUTPUT DIFFERENTIAL INPUT VOLTAGE Figure 1. Input and Output Waveforms, Noninverting Input Varied Applications Information th VOD VIN VOH VOL COMPARE ts tPD+ OUTPUT 1.4V (QOUT) VOL tSKEW VOH OUTPUT (QOUT) 1.4V VOL Circuit Layout Because of the MAX907/MAX908/MAX909's high gain bandwidth, special precautions must be taken to realize the full high-speed capability. A printed circuit board with a good, low-inductance ground plane is mandatory. Place the decoupling capacitor (a 0.1F ceramic capacitor is a good choice) as close to V+ as possible. Pay close attention to the decoupling capacitor's bandwidth, keeping leads short. Short lead lengths on the inputs and outputs are also essential to avoid unwanted parasitic feedback around the comparators. Solder the device directly to the printed circuit board instead of using a socket. Figure 2. MAX909 Timing Diagram Battery-Operated Infrared Data Link Figure 4's circuit allows reception of infrared data. The MAX403 converts the photodiode current to a voltage, and the MAX907 determines whether the amplifier output is high enough to be called a "1". The current consumption of this circuit is minimal: The MAX403 and MAX907 require typically 250A and 700A, respectively. Overdriving the Inputs The inputs to the MAX907/MAX908/MAX909 may be driven beyond the voltage limits given in the Absolute Maximum Ratings, as long as the current flowing into the device is limited to 25mA. However, if the inputs are overdriven, the output may be inverted. The addition of an external diode prevents this inversion by limiting the input voltage to 200mV to 300mV below ground (Figure 3). _______________________________________________________________________________________ 9 MAX907/MAX908/MAX909 VTRIP+ MAX907/MAX908/MAX909 Single/Dual/Quad, High-Speed, Ultra-Low-Power, Single-Supply TTL Comparators 10pF 1M VCLAMP = -200mV TO -300mV +5V 1/2 MAX907 +5V 0.1F MAX403 2 7 6 SIEMENS BP-104 PHOTODIODE 3 ISRC 3 1 4 100k 47k 0.1F 8 2 4 100k DATA MAX907 +5V 1000pF V- 1000pF Figure 3. Schottky Clamp for Input Driven Below Ground Pin Configurations (continued) Figure 4. Battery-Operated Infrared Data Link Consumes Only 1mA Ordering Information (continued) PART TOP VIEW V+ 1 TEMP RANGE PIN-PACKAGE MAX908CPD 0C to +70C 14 Plastic DIP MAX908CSD 0C to +70C 14 SO 8 QOUT MAX908EPD -40C to +85C 14 Plastic DIP 7 QOUT MAX908ESD -40C to +85C 14 SO IN- 3 6 GND MAX909CPA 0C to +70C 8 Plastic DIP V- 4 5 LE MAX909CSA 0C to +70C 8 SO MAX909EPA -40C to +85C 8 Plastic DIP MAX909ESA -40C to +85C 8 SO IN+ MAX909 2 DIP/SO Chip Information MAX907 TRANSISTOR COUNT: 262 MAX908 TRANSISTOR COUNT: 536 MAX909 TRANSISTOR COUNT: 140 PROCESS: Bipolar 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. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.