MAX9420 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Quad Differential LVECL-to-LVPECL Translators

19-2285; Rev 0; 1/02
Quad Differential LVECL-to-LVPECL Translators
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 50Ω series outputs. The MAX9422 has
100Ω differential input impedance and open-emitter
outputs. The MAX9423 has 100Ω differential input
impedance and 50Ω 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
Functional Diagram appears at end of data sheet.
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 50Ω Outputs (MAX9421/MAX9423)
o Integrated 100Ω Inputs (MAX9422/MAX9423)
o Synchronous/Asynchronous Operation
Ordering Information
PART
TEMP
RANGE
PIN-
DATA
PACKAGE INPUT
OUTPUT
MAX9420EHJ -40°C to +85°C 32 TQFP Open Open
MAX9420EGJ* -40°C to +85°C 32 QFN
MAX9421EHJ -40°C to +85°C 32 TQFP
MAX9421EGJ* -40°C to +85°C 32 QFN
MAX9422EHJ -40°C to +85°C 32 TQFP
MAX9422EGJ* -40°C to +85°C 32 QFN
MAX9423EHJ -40°C to +85°C 32 TQFP
MAX9423EGJ* -40°C to +85°C 32 QFN
Open
Open
Open
100Ω
100Ω
100Ω
100Ω
Open
50Ω
50Ω
Open
Open
50Ω
50Ω
*Future product—contact factory for availability.
Pin Configurations
TOP VIEW
32 31 30 29 28 27 26 25
V_EE 1
SEL 2
SEL 3
CLK 4
CLK 5
EN 6
EN 7
V_EE 8
MAX9420
MAX9421
MAX9422
MAX9423
24 V_CC
23 OUT1
22 OUT1
21 GND
20 GND
19 OUT2
18 OUT2
17 V_CC
9 10 11 12 13 14 15 16
TQFP (5mm x 5mm)
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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