Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Comparator Multi-purpose CMOS, Open drain, Rail-to-rail, TTL SOIC 8 N

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________________General Description

The MAX987/MAX988/MAX991/MAX992/MAX995/

MAX996 single/dual/quad micropower comparators

feature low-voltage operation and rail-to-rail inputs and

outputs. Their operating voltage ranges from +2.5V to

+5.5V, making them ideal for both 3V and 5V systems.

These comparators also operate with ±1.25V to ±2.75V

dual supplies. They consume only 48µA per compara-

tor while achieving a 120ns propagation delay.

Input bias current is typically 1.0pA, and input offset volt-

age is typically 0.5mV. Internal hysteresis ensures clean

output switching, even with slow-moving input signals.

The output stage’s unique design limits supply-current

surges while switching, virtually eliminating the supply

glitches typical of many other comparators. The

MAX987/MAX991/MAX995 have a push-pull output

stage that sinks as well as sources current. Large inter-

nal output drivers allow rail-to-rail output swing with

loads up to 8mA. The MAX988/MAX992/MAX996 have

an open-drain output stage that can be pulled beyond

to 6V (max) above V

. These open-drain versions

are ideal for level translators and bipolar to single-

ended converters.

The single MAX987/MAX988 are available in tiny 5-pin

SC70 packages, while the dual MAX991/MAX992 are

available in ultra-small 8-pin SOT23 and µMAX

pack-

ages.

____________________________Features

♦ 120ns Propagation Delay

♦ 48µA Quiescent Supply Current

♦ +2.5V to +5.5V Single-Supply Operation

♦ Common-Mode Input Voltage Range Extends

250mV Beyond the Rails

♦ Push-Pull Output Stage Sinks and Sources

8mA Current (MAX987/MAX991/MAX995)

♦ Open-Drain Output Voltage Extends Beyond V

(MAX988/MAX992/MAX996)

♦ Unique Output Stage Reduces Output Switching

Current, Minimizing Overall Power Consumption

♦ 100µA Supply Current at 1MHz Switching

Frequency

♦ No Phase Reversal for Overdriven Inputs

♦ Available in Space-Saving Packages:

5-Pin SOT23 (MAX987/MAX988)

8-Pin µMAX (MAX991/MAX992)

MAX987/MAX988/MAX991/MAX992/MAX995/MAX996

High-Speed, Micropower, Low-Voltage,

SOT23, Rail-to-Rail I/O Comparators

________________________________________________________________ Maxim Integrated Products 1

IN-

IN+

OUT

MAX987

MAX988

SOT23/SC70

TOP VIEW

Pin Configurations

19-1266; Rev 2; 1/07

_______________Ordering Information

Ordering Information continued at end of data sheet.

Typical Application Circuit appears at end of data sheet.

Pin Configurations continued at end of data sheet.

Portable/Battery-

Powered Systems

Mobile Communications

Zero-Crossing Detectors

Window Comparators

Level Translators

Threshold Detectors/

Discriminators

Ground/Supply Sensing

IR Receivers

Digital Line Receivers

Selector Guide

Applications

PART PIN-PACKAGE

PKG

CODE

TOP

MARK

MAX987EXK-T 5 SC70-5

X5-1

ABM

MAX987EUK-T 5 SOT23-5

U5-1

ABZB

MAX987ESA 8 SO

S8-2

—

PART

COMPARATORS

PER PACKAGE

OUTPUT

STAGE

MAX987 1 Push-Pull

MAX988 1 Open-Drain

MAX991 2 Push-Pull

MAX992 2 Open-Drain

MAX995 4 Push-Pull

MAX996 4 Open-Drain

µMAX is a registered trademark of Maxim Integrated Products,

Inc.

Note: All devices specified over the -40°C to +85°C operating

temperature range.

Summary of content (13 pages)

PAGE 1
9-1266; Rev 2; 1/07 High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators ____________________________Features The MAX987/MAX988/MAX991/MAX992/MAX995/ MAX996 single/dual/quad micropower comparators feature low-voltage operation and rail-to-rail inputs and outputs. Their operating voltage ranges from +2.5V to +5.5V, making them ideal for both 3V and 5V systems. These comparators also operate with ±1.25V to ±2.75V dual supplies.
PAGE 2
MAX987/MAX988/MAX991/MAX992/MAX995/MAX996 High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE) ...................................................6V IN_-, IN_+ to VEE .......................................-0.3V to (VCC + 0.3V) Current into Input Pins .....................................................±20mA OUT_ to VEE MAX987/MAX991/MAX995 ....................-0.3V to (VCC + 0.3V) MAX988/MAX992/MAX996 ...............................
PAGE 3
High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators (VCC = +2.7V to +5.5V, VEE = 0V, VCM = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL OUT Rise Time (MAX987/MAX991/ MAX995 Only) tRISE OUT Fall Time tFALL tPDPropagation Delay tPD+ Power-Up Time tPU CONDITIONS VCC = 5.0V VCC = 5.
PAGE 4
Typical Operating Characteristics (VCC = +5V, VCM = 0V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT PER COMPARATOR vs. TEMPERATURE 80 70 VCC = 5.5.V 60 50 VCC = 2.5.V MAX987 TOC2 1000 SUPPLY CURRENT (µA) VIN+ > VIN- SUPPLY CURRENT (µA) SUPPLY CURRENT PER COMPARATOR vs. OUTPUT TRANSITION FREQUENCY MAX9879 TOC1 90 VCC = 5.5V 100 VCC = 2.5V 40 30 10 -40 -20 0 20 40 60 80 100 0.01 TEMPERATURE (°C) VIN+ > VINOUTPUT HIGH VOLTAGE (mV) (VCC - VOH) 1000 VCC = 2.7V VCC = 5.0V 1 0.
PAGE 5
High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators 1000 VOD = 50mV 190 PROPAGATION DELAY (ns) VOD = 50mV PROPAGATION DELAY (ns) 200 MAX987 TOC8 10,000 MAX987 TOC9 PROPAGATION DELAY vs. TEMPERATURE PROPAGATION DELAY vs. CAPACITIVE LOAD 180 170 VCC = 2.5.V 160 150 140 VCC = 5.5.V 130 120 110 100 0.01 100 0.1 1 10 100 1000 -40 -20 0 20 40 60 80 TEMPERATURE (°C) PROPAGATION DELAY vs.
PAGE 6
MAX987/MAX988/MAX991/MAX992/MAX995/MAX996 High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators Typical Operating Characteristics (continued) (VCC = +5V, VCM = 0V, TA = +25°C, unless otherwise noted.
PAGE 7
High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators PIN MAX987 MAX988 MAX991 MAX996 MAX995 MAX996 NAME FUNCTION SOT23/ SC70 SO SO/µMAX/ SOT23 SO/ TSSOP 1 6 — — OUT Comparator Output 2 7 8 4 VCC Positive Supply Voltage 3 3 — — IN+ Comparator Noninverting Input 4 2 — — IN- Comparator Inverting Input 5 4 4 11 VEE Negative Supply Voltage — — 1 1 OUTA — — 2 2 INA- Comparator A Inverting Input — — 3 3 INA+ Comparator A Noninverting Input
PAGE 8
MAX987/MAX988/MAX991/MAX992/MAX995/MAX996 High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators Detailed Description Applications Information The MAX987/MAX988/MAX991/MAX992/MAX995/ MAX996 are single/dual/quad low-power, low-voltage comparators. They have an operating supply voltage range between +2.5V and +5.5V and consume only 48µA per comparator, while achieving 120ns propagation delay. Their common-mode input voltage range extends 0.25V beyond each rail.
PAGE 9
High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators R2 = 1 = 8.03kΩ ⎛ 1 1 3.0V ⎞ − ⎜ ⎟ − 12kΩ 2.2MΩ ⎝ 1.2 x 12kΩ ⎠ 6) Verify trip voltages and hysteresis as follows: ⎛ 1 1 1⎞ + + VIN rising: VTHR = VREF x R1 x ⎜ ⎟ R2 R3 ⎠ ⎝ R1 ⎛ R1 x VCC ⎞ VIN falling : VTHF = VTHR − ⎜ ⎟ R3 ⎝ ⎠ Use the following procedure to calculate resistor values: 1) Select R3 according to the formulas R3 = VREF / 1µA or R3 = (VREF - VCC) / 1µA - R4. Use the smaller of the two resulting resistor values.
PAGE 10
MAX987/MAX988/MAX991/MAX992/MAX995/MAX996 High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators Zero-Crossing Detector Logic-Level Translator Figure 3 shows a zero-crossing detector application. The MAX987’s inverting input is connected to ground, and its noninverting input is connected to a 100mVp-p signal source. As the signal at the noninverting input crosses 0V, the comparator’s output changes state. Figure 4 shows an application that converts 5V logic levels to 3V logic levels.
PAGE 11
High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators __Ordering Information (continued) VCC PART VIN 0.
PAGE 12
Package Information (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.) SOT-23 5L .
PAGE 13
High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators 8 INCHES DIM A A1 A2 b E Ø0.50±0.1 H c D e E H 0.6±0.1 L 1 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 8LUMAXD.EPS 4X S 8 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.