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MAX907-MAX909

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.

MAX907/MAX908/MAX909

Dual/Quad/Single, High-Speed, Ultra-Low-Power,

Single-Supply TTL Comparators

________________________________________________________________Maxim Integrated Products

Pin Configurations

19-0129; Rev 7; 1/06

General Description

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 sup-plies. Their 40ns propagation delay (with 5mV input overdrive) is achieved with a power consumption of only 3.5mW per comparator. The wide input common-mode 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 compara-tors 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 out-puts can be continuously shorted to either supply rail without damage. These easy-to-use comparators incor-porate internal hysteresis to ensure clean output switch-ing 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 com-parators are ideal for single +5V-supply applications that require the combination of high speed, precision,and ultra-low power dissipation.

Applications

Battery-Powered Systems High-Speed A/D Converters High-Speed V/F Converters Line Receivers

Threshold Detectors/Discriminators High-Speed Sampling Circuits Zero-Crossing Detectors

Features

?40ns Propagation Delay

?700μA (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, 500μV 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

*Go to https://www.wendangku.net/doc/3c6615988.html,/PR-1for details on high-reliability plastic processing.

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at https://www.wendangku.net/doc/3c6615988.html,.

M A X 907/M A X 908/M A X 909

Dual/Quad/Single, High-Speed, Ultra-Low-Power,Single-Supply TTL Comparators 2_______________________________________________________________________________________

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

Continuous Power Dissipation (T A = +70°C)

8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)...727mW 8-Pin SO (derate 5.88mW/°C above +70°C)...........471mW 14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)...800mW 14-Pin SO (derate 8.33mW/°C above +70°C)..........667mW Operating Temperature Ranges:

MAX90_C_ _......................................0°C to +70°C MAX90_E_ _ ...................................-40°C to +85°C MAX907MSA/PR ..............................-55°C to +125°C Storage Temperature Range ...................-65°C to +150°C Lead Temperature (soldering, 10s)......................+300°C

ELECTRICAL CHARACTERISTICS

(V+ = 5V, T A = +25°C ; MAX909 only: V- = 0V, V LATCH = 0V; unless otherwise noted.)

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.

ABSOLUTE MAXIMUM RATINGS

MAX909 only: V- = -5V

V V OUT = 2.4V to 0.4V, C L = 10pF

V OUT = 0.4V to 2.4V, C L = 10pF MAX907/MAX908

(Notes 3, 4)MAX909

MAX909MAX907/MAX908MAX907/MAX908/MAX909SYMBOL ns

t f

Output Fall Time

ns 12t r Output Rise Time 610mW 3.5 5.5(Note 8)

PD Power Dissipation per Comparator μA 60100MAX909 only: V- = -5V I-Negative Supply Current 1.2 1.8mA 0.7 1.0(Note 7)

I+Positive Supply Current per Comparator

0.4I SINK = 8mA 0.360.475

I SINK = 3.2mA V OL Output Low Voltage V 3.0

3.5I SOURCE = 100μA V OH Output High Voltage μV/V 50200

(Notes 4, 6)

PSRR Power-Supply Rejection Ratio μV/V 50150(Notes 4, 5)CMRR Common-Mode Rejection Ratio -5.2

V+ - 1.5V -0.2V+ - 1.5V CMR Input Voltage Range

nA 25

50V CM = 0V, V IN = V OS I OS Input Offset Current nA 100300V CM = 0V, V IN = V OS I B Input Bias Current mV 0.5 2.0(Note 2)

V OS Input Offset Voltage mV -2-4(Note 1)

V TRIP-Negative Trip Point mV 24(Note 1)V TRIP+Positive Trip Point UNITS MIN

TYP MAX CONDITIONS

PARAMETER

MAX907/MAX908/MAX909

Dual/Quad/Single, High-Speed, Ultra-Low-Power,

Single-Supply TTL Comparators

_______________________________________________________________________________________3

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 5V, T A = +25°C ; MAX909 only: V- = 0V, V LATCH = 0V; unless otherwise noted.)

PARAMETER

SYMBOL CONDITIONS

MIN

TYP MAX UNITS Propagation Delay

t PD+,t PD-4050

ns Differential Propagation Delay ?t PD 1ns Propagation Delay Skew t PD skew 2

ns Latch Input Voltage High V IH (Note 12) 2.0

V Latch Input Voltage Low V IL (Note 12)0.8V Latch Input Current I IH , I IL (Note 12)20

μA Latch Setup Time t s (Note 12)2ns Latch Hold Time

t h

(Note 12)

V IN = 100mV, V OD = 5mV (Note 9)

V IN = 100mV, V OD = 5mV (Note 10)

MAX909 only: V IN = 100mV,V OD = 5mV (Note 11)ELECTRICAL CHARACTERISTICS

(V+ = 5V, T A = T MIN to T MAX ; MAX909 only: V- = 0V, V LATCH = 0V; unless otherwise noted.)

M A X 907/M A X 908/M A X 909

Dual/Quad/Single, High-Speed, Ultra-Low-Power,Single-Supply TTL Comparators 4_______________________________________________________________________________________

Note 1:

Trip Point is defined as the input voltage required to make the comparator output change state. The difference

between upper (V TRIP +) and lower (V TRIP -) trip points is equal to the width of the input-referred hysteresis zone (V HYST ).Specified for an input common-mode voltage (V CM ) of 0V (see Figure 1).

Note 2:Input Offset Voltage is defined as the center of the input-referred hysteresis zone. Specified for V CM = 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 V CMR limits. Note also that either or both inputs can be driven to the upper or lower absolute maximum limit with-out 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 (V CMR ).

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. V OS 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 out-puts 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 (t PD +)

and high-to-low transition (t PD -), and also between the QOUT and Q OUT transition on the MAX909.

Note 12:Latch specifications apply to MAX909 only (see Figure 2).

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 5V, T A = T MIN to T MAX ; MAX909 only: V- = 0V, V LATCH = 0V; unless otherwise noted.)

PARAMETER

SYMBOL CONDITIONS

MIN

TYP MAX UNITS Propagation Delay

t PD+,t PD-V IN = 100mV, V OD = 5mV (Note 9)

4570

ns Differential Propagation Delay ?t PD V IN = 100mV, V OD = 5mV (Note 10)

2ns Propagation Delay Skew t PD skew MAX909 only: V IN = 100mV,V OD = 5mV (Note 11)4

ns Latch Input Voltage High V IH (Note 12) 2.0

V Latch Hold Time t h

(Note 12)

Latch Input Voltage Low V IL (Note 12)0.8V Latch Input Current I IH , I IL (Note 12)20

μA Latch Setup Time t s (Note 12)4ns

MAX907/MAX908/MAX909

Dual/Quad/Single, High-Speed, Ultra-Low-Power,

Single-Supply TTL Comparators

_________________________________________________________________________________________________5

100

PROPAGATION DELAY vs. INPUT OVERDRIVE

INPUT OVERDRIVE (mV)

P R O P A G A T I O N D E L A Y (n s

)

3040

2080

010

100

10k

PROPAGATION DELAY vs. SOURCE IMPEDANCE

SOURCE IMPEDANCE (?)

P R O P A G A T I O N D E L A Y (n s )

120

PROPAGATION DELAY vs. CAPACITIVE LOAD

CAPACITIVE LOAD (pF)

P R O P A G A T I O N D E L A Y (n

s )

100

-60-2060140PROPAGATION DELAY vs. TEMPERATURE

4060

TEMPERATURE (°C)

P R O P A G A T I O N D E L A Y (n s )

2010050

-400

8040

120 5.0

3.0

1000

OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT

3.5

I SOURCE (μA)

V O H (V )

4.0

4.5100

Typical Operating Characteristics

(V+ = 5V, T A = +25°C, unless otherwise noted.)

0.5

0.1

OUTPUT LOW VOLTAGE vs. SINK CURRENT

0.2

I SINK (mA)

V O L (V )

0.3

610

0.4

2.0

MAX907

TOTAL POSITIVE SUPPLY CURRENT vs. POSITIVE SUPPLY VOLTAGE

(OUTPUTS AT V OL )

0.5V CC (V)

T O T A L I C

C (m A )

1.0

1.54

2.00

MAX907

TOTAL POSITIVE SUPPLY CURRENT vs. POSITIVE SUPPLY VOLTAGE

(OUTPUTS AT V OH )

0.5V CC (V)

T O T A L I C C

(m A )

1.0

1.54

4.0

MAX908

TOTAL POSITIVE SUPPLY CURRENT vs. POSITIVE SUPPLY VOLTAGE

(OUTPUTS AT V OL )

1.0

V CC (V)

T O T A L I C C

(m A )

2.0

3.04

M A X 907/M A X 908/M A X 909

Dual/Quad/Single, High-Speed, Ultra-Low-Power,Single-Supply TTL Comparators 6________________________________________________________________________________________________

Typical Operating Characteristics (continued)

(V+ = 5V, T A = +25°C, unless otherwise noted.)

4.0

MAX908

TOTAL POSITIVE SUPPLY CURRENT vs. POSITIVE SUPPLY VOLTAGE

(OUTPUTS AT V OH )

1.0

V CC (V)

T O T A L I C C (m A )

2.0

3.04

0.5

-0.5

-60-2060140INPUT OFFSET VOLTAGE vs. TEMPERATURE

TEMPERATURE (°C)

V O S (m V )

201000-400

80401204

-4

-60-2060140TRIP POINT vs. TEMPERATURE

-2

2TEMPERATURE (°C)

V O S (m V )

201000

-400

8040

1205

-1

-60-2060140INPUT VOLTAGE RANGE vs. TEMPERATURE

TEMPERATURE (°C)

I N P U T V O L T A G E R A N G E (V )

20100-400

8040

120 2.0

MAX909

POSITIVE SUPPLY CURRENT vs. POSITIVE SUPPLY VOLTAGE

V+ (V)

T O T A L I + (m A )

1.0

300

100

-60-2060140INPUT BIAS CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

I N P U T C U R R E N T (n A )

20100200

-400

804012060

-60-2060140

SHORT-CIRCUIT OUTPUT CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

S H O R T -C I R C U I T O U T P U T C U R R E N T (m A )

2010030

-400

8040120200

-1

-3

-6

MAX909

NEGATIVE SUPPLY CURRENT vs. NEGATIVE SUPPLY VOLTAGE

V- (V)

T O T A L I - (μA )

-2

-4

100

-5

-7

-6

-60-2060140

MAX909

INPUT VOLTAGE RANGE vs. TEMPERATURE

-5

TEMPERATURE (°C)

I N P U T V O L T A G E R A N G E (V )

100-4040120080

MAX907/MAX908/MAX909

Dual/Quad/Single, High-Speed, Ultra-Low-Power,

Single-Supply TTL Comparators

_________________________________________________________________________________________________7

MAX907/MAX908

PROPAGATION DELAY (t PD +)

(5mV OVERDRIVE)

INPUT

20mV/div

TTL

THRESHOLD (1.4V)OUTPUT GND

10ns/div

5mV OVERDRIVE OUTPUT 500mV/div INPUT GND

MAX907 TOC19

MAX907/MAX908

PROPAGATION DELAY (t

(5mV OVERDRIVE)

INPUT 20mV/div

OUTPUT

500mV/div OUTPUT GND

10ns/div

-5mV OVERDRIVE

TTL

THRESHOLD (1.4V)INPUT GND

MAX907 TOC20

1V/div RESPONSE TO 10MHz SINE WAVE

20mV P-P

10MHz SINE WAVE

INPUT

COMPARATOR

OUTPUT

50ns/div

GND

A X 907 T O C 23

MAX909

PROPAGATION DELAY (t PD +)

(5mV OVERDRIVE)

INPUT 20mV/div

OUTPUT

GND

10ns/div

MAX907 TOC21

MAX909

PROPAGATION DELAY (t PD -)

(5mV OVERDRIVE)

INPUT 20mV/div

OUTPUT

GND

INPUT GND

-5mV OVERDRIVE QOUT 1V/div 10ns/div

MAX907 TOC22

Typical Operating Characteristics (continued)

(V+ = 5V, T A = +25°C, unless otherwise noted.)

M A X 907/M A X 908/M A X 909

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 inter-nal 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).

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 com-parator output is stored when LE is high (Figure 2).

Note that the MAX909 can be operated with V- con-nected 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 8_______________________________________________________________________________________

Pin Description

The latch is transparent when LE is low. The comparator output is stored when LE is high.Inverted Comparator Output

Q OUT

—

Comparator Output QOUT 7——LE 5——Negative Supply or Ground

V-4——Inverting Input

IN-3——Noninverting Input IN+2——Comparator D Output OUTD —14—Comparator D Inverting Input IND-—13—Comparator D Noninverting Input IND+—12—Comparator C Noninverting Input INC+—10—Comparator C Inverting Input INC- —9—Comparator C Output OUTC —8—Positive Supply V+148Comparator B Output OUTB —77Comparator B Inverting Input INB-—66Comparator B Noninverting Input INB+—55Ground

GND 6114Comparator A Noninverting Input INA+—33Comparator A Inverting Input INA-—22Comparator A Output OUTA —11MAX909MAX908

MAX907

FUNCTION

NAME PIN

Applications Information

Circuit Layout

Because of the MAX907/MAX908/MAX909’s high gain bandwidth, special precautions must be taken to real-ize the full high-speed capability. A printed circuit board with a good, low-inductance ground plane is mandatory. Place the decoupling capacitor (a 0.1μF ceramic capacitor is a good choice) as close to V+ as possible. Pay close attention to the decoupling capaci-tor’s bandwidth, keeping leads short. Short lead lengths on the inputs and outputs are also essential to avoid unwanted parasitic feedback around the com-parators. Solder the device directly to the printed circuit board instead of using a socket.

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).

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 consump-tion of this circuit is minimal: The MAX403 and MAX907require typically 250μA and 700μA, respectively.

MAX907/MAX908/MAX909

Dual/Quad/Single, High-Speed, Ultra-Low-Power,

Single-Supply TTL Comparators

_______________________________________________________________________________________9

Figure 1. Input and Output Waveforms, Noninverting Input Varied

M A X 907/M A X 908/M A X 909

Single/Dual/Quad, High-Speed, Ultra-Low-Power,Single-Supply TTL 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.

10____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600?2006 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products, Inc.

Pin Configurations (continued)

Ordering Information (continued)

PART TEMP RANGE PIN-PACKAGE MAX908CPD 0°C to +70°C 14Plastic DIP MAX908CSD 0°C to +70°C 14SO MAX908EPD -40°C to +85°C 14Plastic DIP MAX908ESD -40°C to +85°C 14SO MAX909CPA 0°C to +70°C 8Plastic DIP MAX909CSA 0°C to +70°C 8SO MAX909EPA -40°C to +85°C 8Plastic DIP MAX909ESA

-40°C to +85°C

8SO

Chip Information

MAX907 TRANSISTOR COUNT: 262MAX908 TRANSISTOR COUNT: 536MAX909 TRANSISTOR COUNT: 140PROCESS: Bipolar