_______________General Description

The MAX9687 is a dual, ultra-fast ECL comparator

manufactured with a high-frequency bipolar process

This design maintains the excellent DC matching char-

acteristics normally found only in slower comparators.

The MAX9687 is pin-compatible with the AD9687 and

Am6687, but exceeds their AC characteristics.

The MAX9687 has differential inputs and complemen-

tary outputs that are fully compatible with ECL-logic lev-

els. Output current levels are capable of driving 50

Ω

terminated transmission lines. The ultra-fast operation

makes signal processing possible at frequencies in

excess of 600MHz.

A latch-enable (LE) function is provided to allow the

comparator to be used in a sample/hold or track/hold

mode. The latch-enable inputs are designed to be dri-

ven from the complementary outputs of a standard ECL

gate. When LE is high and

–

L

—

E

–

is low, the comparator

functions normally. When LE is forced low and

–

L

—

E

–

is

high, the comparator outputs are locked in the logical

states determined by the input conditions at the time of

the latch transition. If the latch-enable function is not

used on either of the two comparators, the appropriate

LE input must be connected to ground; the companion

–

L

—

E

–

input can be left open.

________________________Applications

High-Speed A/D Converters

High-Speed Line Receivers

Peak Detectors

Threshold Detectors

High-Speed Triggers

____________________________Features

o 1.4ns Propagation Delay

o 0.5ns Latch Setup Time

o 2.0ns Latch-Enable Pulse Width

o +5V, -5.2V Power Supplies

o Pin-Compatible with AD9687, Am6687, SP9687

o Available in Commercial, Extended-Industrial,

and Military Temperature Ranges

o Available in Narrow SO Package

______________Ordering Information

* Contact factory for availability of 20-pin PLCC.

** Contact factory for dice specifications.

Dual, Ultra-Fast ECL-Output Comparator

________________________________________________________________

Maxim Integrated Products

1

NONINVERTING

INPUT

RL

RL

LE

LE

INVERTING

INPUT

NONINVERTING

INPUT

INVERTING

INPUT

Q OUT

Q OUT

RL

RL

LE

LE

LATCH ENABLE

LATCH ENABLE

THE OUTPUTS ARE OPEN EMITTERS, REQUIRING EXTERNAL PULL-DOWN

RESISTORS. THESE RESISTORS MAY BE IN THE RANGE OF 50

Ω – 200Ω

CONNECTED TO -2.0V, OR 240

Ω – 2000Ω CONNECTED TO -5.2V.

________________Functional Diagram

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Q OUT

Q OUT

GND

LEB

LEB

V+

INB-

INB+

Q OUT

Q OUT

GND

LEA

LEA

V-

INA-

INA+

TOP VIEW

DIP/SO

A

B

___________________Pin Configuration

Call toll free 1-800-998-8800 for free samples or literature.

19-2400; Rev 1; 7/93

PART

TEMP. RANGE

PIN-PACKAGE*

MAX9687CPE

0°C to +70°C

16 Plastic DIP

MAX9687CSE

0°C to +70°C

16 Narrow SO

MAX9687CJE

0°C to +70°C

16 CERDIP

MAX9687C/D

0°C to +70°C

Dice**

MAX9687EPE

-40°C to +85°C

16 Plastic DIP

MAX9687ESE

-40°C to +85°C

16 Narrow SO

MAX9687MJE

-55°C to +125°C

16 CERDIP