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General Description

The MAX965–MAX970 single/dual/quad micropower

comparators feature rail-to-rail inputs and outputs, and

fully specified single-supply operation down to +1.6V.

These devices draw less than 5µA per comparator and

have open-drain outputs that can be pulled beyond V

to 6V (max) above ground. In addition, their rail-to-rail

input common-mode voltage range makes these com-

parators suitable for ultra-low-voltage operation.

A +1.6V to +5.5V single-supply operating voltage range

makes the MAX965 family of comparators ideal for 2-cell

battery-powered applications. The MAX965/MAX967/

MAX968/MAX969 offer programmable hysteresis and

an internal 1.235V ±1.5% reference. All devices are

available in either space-saving 8-pin µMAX

or 16-pin

QSOP packages.

________________________Applications

2-Cell Battery-Powered/Portable Systems

Window Comparators

Threshold Detectors/Discriminators

Mobile Communications

Voltage-Level Translation

Ground/Supply-Sensing Applications

____________________________Features

♦ Ultra-Low Single-Supply Operation down to +1.6V

♦ Rail-to-Rail Common-Mode Input Voltage Range

♦ 3µA Quiescent Supply Current per Comparator

♦ Open-Drain Outputs Swing Beyond V

♦ 1.235V ±1.5% Precision Internal Reference

(MAX965/967/968/969)

♦ 10µs Propagation Delay (50mV overdrive)

♦ Available in Space-Saving Packages:

8-Pin µMAX (MAX965–MAX968)

16-Pin QSOP (MAX969/MAX970)

MAX965–MAX970

Single/Dual/Quad, Micropower,

Ultra-Low-Voltage, Rail-to-Rail I/O Comparators

________________________________________________________________ Maxim Integrated Products 1

OUT

GND

1.235V

REF6

HYST

IN-4

IN+3

PULLUP

MAX965

PART TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX965ESA -40°C to +85°C

8 SO

S8-2

MAX965EUA-T -40°C to +85°C

8 µMAX-8

U8-1

MAX966ESA -40°C to +85°C

8 SO

S8-2

MAX966EUA-T -40°C to +85°C

8 µMAX-8

U8-1

MAX967ESA -40°C to +85°C

8 SO

S8-2

MAX967EUA-T -40°C to +85°C

8 µMAX-8

U8-1

__________Typical Operating Circuit

19-1226; Rev 3; 2/07

Ordering Information

PART

INTERNAL

REFERENCE

PROGRAMMABLE

HYSTERESIS

MAX965

Yes Yes

MAX966

No No

MAX967

Yes Yes

MAX968

Yes Yes

MAX969

Yes Yes

MAX970

No No

COMPARATORS

PER

PACKAGE

_____________________Selector Guide

Ordering Information continued on last page.

Pin Configurations appear at end of data sheet.

µMAX is a registered trademark of Maxim Integrated Products,

Inc.

Summary of content (14 pages)

PAGE 1
9-1226; Rev 3; 2/07 Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators ____________________________Features The MAX965–MAX970 single/dual/quad micropower comparators feature rail-to-rail inputs and outputs, and fully specified single-supply operation down to +1.6V. These devices draw less than 5µA per comparator and have open-drain outputs that can be pulled beyond VCC to 6V (max) above ground.
PAGE 2
MAX965–MAX970 Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC) ............................................................+6V Voltages IN_-, IN_+, REF, HYST ..........................-0.3V to (VCC + 0.3V) OUT_ ...............................................................-0.3V to +6.0V Current into Input Pins ......................................................±20mA Duration of OUT_ Short Circuit to GND or VCC ..........
PAGE 3
Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators MAX965–MAX970 ELECTRICAL CHARACTERISTICS (continued) (VCC = +1.6V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3V and TA = +25°C.) PARAMETER SYMBOL Common-Mode Rejection Ratio CMRR CONDITIONS MIN TYP MAX UNITS 1.5 4.0 mV/V VREF V VREF 0.
PAGE 4
_____________________________Typical Operating Characteristics (continued) (VCC = +3.0V, RPULLUP = 100kΩ, VCM = 0V, TA = +25°C, unless otherwise noted.) MAX969 SUPPLY CURRENT vs. TEMPERATURE 14 VCC = 3.0V VCC = 5.0V 12 11 VCC = 3.0V 10 VCC = 2.0V 9 10 VCC = 2.0V 8 VIN+ > VIN- 8 VIN+ > VIN- 2.0 1.5 1.0 0.5 VIN+ > VIN0 0 20 40 60 80 100 -60 -40 -20 MAX965/70-TOC7a 14 12 10 8 6 4 2 VIN+ > VIN- OUTPUT SHORT-CIRCUIT SINK CURRENT (mA) MAX965 SUPPLY CURRENT vs.
PAGE 5
Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators MAX965–MAX970 _____________________________Typical Operating Characteristics (continued) (VCC = +3.0V, RPULLUP = 100kΩ, VCM = 0V, TA = +25°C, unless otherwise noted.) 3.4 3.2 VCC = 5.5V 2.8 2.6 VCC = 1.6V 190 180 170 160 150 140 130 2.0 1.5 1.0 100 -60 -40 -20 60 80 -40 100 25 20 VCC = 5V 1.2340 1.2330 15 10 VCC = 2V 1.2325 VCC = 5.0V VHYST = 22mV (PROGRAMMED) 1.2320 -40 -20 MAX965/70-TOC18a 1.2 100 1.
PAGE 6
MAX965–MAX970 Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators _____________________________Typical Operating Characteristics (continued) (VCC = +3.0V, RPULLUP = 100kΩ, VCM = 0V, TA = +25°C, unless otherwise noted.
PAGE 7
Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators PIN MAX970 NAME FUNCTION MAX969 SO QSOP 1 1 1 OUTB Comparator B Open-Drain Output 2 2 2 OUTA Comparator A Open-Drain Output 3 3 3 VCC Positive Supply Voltage, +1.6V to +5.5V 4 4 4 INA- Comparator A Inverting Input 5 5 5 INA+ Comparator A Noninverting Input 6 6 6 INB- Comparator B Inverting Input 7 7 7 INB+ Comparator B Noninverting Input — — 8, 9 N.C. No Connection.
PAGE 8
MAX965–MAX970 Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators ________________________________________________________Functional Diagrams VCC VCC IN+ OUTA OUTB OUT MAX966 INHYST REF MAX965 + 1.235V REF INA+ INB+ INA- INBGND GND VCC INA+ VCC INA+ OUTA OUTA REF REF HYST HYST REF REF 1.235V 1.
PAGE 9
Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators Figure 1 shows a typical comparator application that monitors VCC at 1.6V. Resistor divider R1/R2 sets the voltage trip point (VTRIP) at 1.6V. As VCC drops below 1.6V and approaches 1V, the reference voltage typically falls below the divider voltage (V+). This causes the comparator output to change state. If OUT’s state must be maintained under these conditions, a latching circuit is required.
PAGE 10
MAX965–MAX970 Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators Figure 2 illustrates the case in which IN- has a fixed voltage applied, and IN+ is varied. If the inputs were reversed, the figure would be the same, except with an inverted output. Adding Hysteresis to the MAX965/MAX967/MAX968/MAX969 To add hysteresis to the MAX965/MAX967/MAX968/ MAX969, connect resistor R1 between REF and HYST, and connect resistor R2 between HYST and GND (Figure 3).
PAGE 11
Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators 5) Calculate R2 as follows: IR Receiver Figure 5 shows an application using the MAX965 as an infrared receiver. The infrared photodiode creates a current relative to the amount of infrared light present. This current creates a voltage across R1. When this voltage level crosses the reference voltage applied to the inverting input, the output transitions. Optional R3 provides additional hysteresis for noise immunity.
PAGE 12
MAX965–MAX970 Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators __________________________________________________________Pin Configurations TOP VIEW GND 1 N.C.
PAGE 13
Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators 4X S 8 E Ø0.50±0.1 8 INCHES DIM A A1 A2 b H c D e E H 0.6±0.1 1 L 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6° 0° 0.0207 BSC MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95 0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0° 6° 0.
PAGE 14
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) DIM A A1 B C e E H L N E H INCHES MILLIMETERS MAX MIN 0.053 0.069 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050 MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 SOICN .