
General Description
The MAX9420–MAX9423 are extremely fast, low-skew
quad LVECL-to-LVPECL translators designed for high-
speed signal and clock driver applications. The
devices feature ultra-low propagation delay of 336ps
and channel-to-channel skew of 17ps.
The four channels can be operated synchronously with
an external clock, or in asynchronous mode, deter-
mined by the state of the SEL input. An enable input
provides the ability to force all the outputs to a differen-
tial low state.
These devices operate with a negative supply voltage
of -2.0V to -3.6V, compatible with LVECL input signals.
The positive supply range is 2.375V to 3.6V for differen-
tial LVPECL output signals.
A variety of input and output terminations are offered for
maximum design flexibility. The MAX9420 has open
inputs and open-emitter outputs. The MAX9421 has
open inputs and 50
series outputs. The MAX9422 has
100
differential input impedance and open-emitter
outputs. The MAX9423 has 100
differential input
impedance and 50
series outputs.
The MAX9420–MAX9423 are specified for operation
from -40°C to +85°C, and are offered in space-saving
32-pin 5mm
5mm TQFP and 32-lead 5mm
5mm
QFN packages.
Applications
Data and Clock Driver and Buffer
Central Office Backplane Clock Distribution
DSLAM Backplane
Base Station
ATE
Features
o
>500mV Differential Output at 3.0GHz Clock
o
336ps (typ) Propagation Delay in Asynchronous
Mode
o
17ps (typ) Channel-to-Channel Skew
o
Integrated 50
Outputs (MAX9421/MAX9423)
o
Integrated 100
Inputs (MAX9422/MAX9423)
o
Synchronous/Asynchronous Operation
M
Quad Differential LVECL-to-LVPECL Translators
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
Ordering Information
TQFP (5mm x 5mm)
TOP VIEW
32
28
29
30
31
25
26
27
I
V
C
O
O
I
G
I
I
10
13
15
14
16
11
12
9
I
V
C
I
O
O
I
G
I
17
18
19
20
21
22
23 OUT1
24 V
CC
OUT1
GND
GND
OUT2
OUT2
V
CC
2
3
4
5
6
7
8
V
EE
EN
EN
CLK
CLK
SEL
SEL
1
V
EE
MAX9420
MAX9421
MAX9422
MAX9423
Pin Configurations
19-2285; Rev 0; 1/02
Functional Diagram appears at end of data sheet.
PART
TEMP
RANGE
PIN-
PACKAGE
DATA
INPUT
OUTPUT
MAX9420
EHJ
MAX9420EGJ* -40
°
C to +85
°
C 32 QFN
MAX9421
EHJ
-40
°
C to +85
°
C 32 TQFP
MAX9421EGJ* -40
°
C to +85
°
C 32 QFN
MAX9422
EHJ
-40
°
C to +85
°
C 32 TQFP
MAX9422EGJ* -40
°
C to +85
°
C 32 QFN
MAX9423
EHJ
-40
°
C to +85
°
C 32 TQFP
MAX9423EGJ* -40
°
C to +85
°
C 32 QFN
-40
°
C to +85
°
C 32 TQFP
Open
Open
Open
Open
100
100
100
100
Open
Open
50
50
Open
Open
50
50
Pin Configurations continued at end of data sheet.
*
Future product—contact factory for availability.