
_______________General Desc ription
The MAX9687 is a dual, ultra-fast ECL comparator
manufactured with a high-frequency bipolar process
(f
T
= 6GHz) capable of very short propagation delays.
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
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
functions normally. When LE is forced low and –—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
________________________Applic ations
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.
M
Dual, Ultra-Fast ECL-Output Comparator
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
NONINVERTING
INPUT
RL
RL
LE LE
V
T
INVERTING
INPUT
NONINVERTING
INPUT
INVERTING
INPUT
QOUT
QOUT
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
– 200
CONNECTED TO -2.0V, OR 240
– 2000
CONNECTED TO -5.2V.
________________Func tional Diagram
2
4
1
3
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
19-2400; Rev 1; 7/93
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE*
16 Plastic DIP
16 Narrow SO
16 CERDIP
Dice**
16 Plastic DIP
16 Narrow SO
16 CERDIP
MAX9687CPE
MAX9687CSE
MAX9687CJ E
MAX9687C/D
MAX9687EPE
MAX9687ESE
MAX9687MJ E