MAX9421 Maxim, MAX9421 Datasheet

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MAX9421

Manufacturer Part Number
MAX9421
Description
The MAX9420-MAX9423 are extremely fast, low-skew quad LVECL-to-LVPECL translators designed for high-speed signal and clock driver applications
Manufacturer
Maxim
Datasheet
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
QFN packages.
19-2285; Rev 0; 1/02
Functional Diagram appears at end of data sheet.
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.
Quad Differential LVECL-to-LVPECL Translators
Data and Clock Driver and Buffer
Central Office Backplane Clock Distribution
DSLAM Backplane
Base Station
ATE
5mm TQFP and 32-lead 5mm
________________________________________________________________ Maxim Integrated Products
General Description
Applications
5mm
o >500mV Differential Output at 3.0GHz Clock
o 336ps (typ) Propagation Delay in Asynchronous
o 17ps (typ) Channel-to-Channel Skew
o Integrated 50Ω Outputs (MAX9421/MAX9423)
o Integrated 100Ω Inputs (MAX9422/MAX9423)
o Synchronous/Asynchronous Operation
*Future product—contact factory for availability.
MAX9420EHJ -40°C to +85°C 32 TQFP
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
Pin Configurations continued at end of data sheet.
Mode
PART
CLK
CLK
SEL
SEL
V
V
TOP VIEW
EN
EN
EE
EE
1
2
3
4
5
7
8
6
32
9
TQFP (5mm x 5mm)
RANGE
TEMP
10
31
11
30
Ordering Information
MAX9420
MAX9421
MAX9422
MAX9423
Pin Configurations
29
12
28
13
PACKAGE
PIN-
14
27
15
26
16
25
INPUT
DATA
Open
Open
Open
Open
100Ω
100Ω
100Ω
100Ω
Features
24 V
23 OUT1
22
21
20
19
18
17
OUT1
GND
GND
OUT2
OUT2
V
CC
CC
OUTPUT
Open
Open
Open
Open
50Ω
50Ω
50Ω
50Ω
1

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MAX9421 Summary of contents

Page 1

... 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 ...

Page 2

... CLK, or CLK = V MAX9421 , I IL EN, EN, SEL, SEL, CLK, or MAX9422/ CLK = V MAX9423 or V IHD MAX9422/MAX9423 Figure 1 OL Figure 1 OCM MAX9421/MAX9423, Figure 2 MAX9421/MAX9423, Figure 2 OUT ✕ 5mm TQFP.........................................+73°C/W 5mm TQFP.........................................+25°C/W ✕ ✕ 5mm QFN .........................................+2°C/W - 2.0V. Typical val- CC MIN TYP MAX 1 ...

Page 3

... V = -1.7V, unless otherwise noted.) (Notes 1, 2, and 3) IHD ILD CONDITIONS OUT_, OUT_ MAX9421/MAX9422 open MAX9423 MAX9421/MAX9423 OUT_, OUT_ I CC open MAX9420/MAX9422 = 1.5GHz, CLK = 3.0GHz, input transition time = 125ps (20% to 80%), V |. Typical values are CONDITIONS t SEL = high, Figure ...

Page 4

Quad Differential LVECL-to-LVPECL Translators AC ELECTRICAL CHARACTERISTICS (continued -2.0V to -3.6V 2.375V to 3.6V, GND = 0, outputs terminated with 50Ω ± low 2.0GHz. For SEL = low, F ...

Page 5

Quad Differential LVECL-to-LVPECL Translators PIN NAME Negative Supply Voltage. Bypass capacitors as close to the device as possible with the smaller value capacitor closest to the device. Noninverting Differential Select Input. Setting SEL = high ...

Page 6

... EE INPUT VOLTAGE DEFINITION Figure 1. Input and Output Voltage Definitions 6 _______________________________________________________________________________________ The MAX9421/MAX9423 have internal 50Ω series out- put termination resistors and 8mA internal pulldown current sources. Using integrated resistors reduces external component count. The MAX9420/MAX9422 have open-emitter outputs. An external termination is required. See the Output Termination section ...

Page 7

... MAX9420/MAX9422 Figure 2. Input and Output Configurations IN_ IN_ OUT_ OUT_ DIFFERENTIAL OUTPUT WAVEFORM OUT_ - OUT_ Figure 3. IN-to-OUT Propagation Delay Timing Diagram _______________________________________________________________________________________ IN_ IN_ MAX9422/MAX9423 V CC OUT_ OUT_ I SINK MAX9421/MAX9423 IHD ILD t PLH1 80 20 ...

Page 8

... For example, if OUT_ is used as a single-ended output, terminate both OUT_ and OUT_. Ensure that the output currents do not exceed the cur- rent limits as specified in the Absolute Maximum Ratings table. Under all operating conditions, the device’s total thermal limits should be observed. ...

Page 9

... MAX9421 CLK 5 MAX9422 MAX9423 QFN-EP* *EXPOSED PADDLE AND CORNER PINS ARE CONNECTED TO V LEAD UNDER PACKAGE. _______________________________________________________________________________________ V CC IN_ OUT_ OUT_ OUT_ IN_ MAX9420 MAX9421 1kΩ OUT1 22 OUT1 21 GND 20 GND 19 OUT2 18 OUT2 OUT_ 100Ω ...

Page 10

Quad Differential LVECL-to-LVPECL Translators IN0 IN0 IN1 IN1 IN2 IN2 IN3 IN3 CLK CLK SEL SEL ______________________________________________________________________________________ ...

Page 11

Quad Differential LVECL-to-LVPECL Translators ______________________________________________________________________________________ Package Information 11 ...

Page 12

Quad Differential LVECL-to-LVPECL Translators 12 ______________________________________________________________________________________ Package Information (continued) ...

Page 13

... Quad Differential LVECL-to-LVPECL Translators Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © ...

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