General Description
The MAX9375 is a fully differential, high-speed, anything-to-LVPECL translator designed for signal rates up
to 2GHz. The MAX9375’s extremely low propagation
delay and high speed make it ideal for various highspeed network routing and backplane applications.
The MAX9375 accepts any differential input signal within
the supply rails and with minimum amplitude of 100mV.
Inputs are fully compatible with the LVDS, LVPECL,
HSTL, and CML differential signaling standards. Outputs
are LVPECL and have sufficient current to drive 50Ω
transmission lines.
The MAX9375 is available in an 8-pin µMAX package
and operates from a single +3.3V supply over the -40°C
to +85°C temperature range.
Applications
Backplane Logic Standard Translation
LAN
WAN
DSLAM
DLC
Features
♦ Guaranteed 2GHz Switching Frequency
♦ Accepts LVDS/LVPECL/Anything Inputs
♦ 421ps (typ) Propagation Delays
♦ 30ps (max) Pulse Skew
♦ 2ps
RMS
(max) Random Jitter
♦ Minimum 100mV Differential Input to Guarantee
AC Specifications
♦ Temperature-Compensated LVPECL Output
♦ +3.0V to +3.6V Power-Supply Operating Range
♦ >2kV ESD Protection (Human Body Model)
MAX9375
Single LVDS/Anything-to-LVPECL Translator
________________________________________________________________ Maxim Integrated Products 1
Pin Configuration
Ordering Information
19-2808; Rev 0; 4/03
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.
Functional Diagram
MAX9375EUA -40°C to +85°C 8 µMAX
PART TEMP RANGE PIN-PACKAGE
8
V
MAX9375
µMAX
CC
OUT
7
OUT
6
GND
5
LVDS/ANY
TOP VIEW
1
V
CC
IN
GND
2
IN
3
4
LVPECL
SINGLE TRANSLATOR
MAX9375
Single LVDS/Anything-to-LVPECL Translator
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCCto GND...........................................................-0.3V to +4.1V
Inputs (IN, IN).............................................-0.3V to (V
CC
+ 0.3V)
IN to IN................................................................................±3.0V
Continuous Output Current .................................................50mA
Surge Output Current .......................................................100mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 5.9mW/°C above +70°C) ..........470.6mW
θ
JA
in Still Air............................................................+170°C/W
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
ESD Protection
Human Body Model (IN, IN, OUT, OUT) .........................≥ 2kV
Soldering Temperature (10s) ...........................................+300°C
DC ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +3.6V, differential input voltage |VID| = 0.1V to 3.0V, input voltage (VIN, VIN) = 0 to VCC, input common-mode voltage
V
CM
= 0.05V to (VCC- 0.05V), LVPECL outputs terminated with 50Ω ±1% to VCC- 2.0V, TA= -40°C to +85°C. Typical values are at
V
CC
= +3.3V, |VID| = 0.2V, input common-mode voltage VCM= 1.2V, TA= +25°C, unless otherwise noted.) (Notes 1, 2, 3)
PARAMETER SYMBOL CONDITIONS
DIFFERENTIAL INPUTS (IN, IN)
Differential Input
Threshold
Input Current IIN, I INVIN, V IN = VCC or 0V -20 +20 -20 +20 -20 +20 µA
Input CommonMode Voltage
LVPECL OUTPUTS (OUT, OUT)
Single-Ended
Output High
Voltage
V
V
V
THD
Figure 1 0.05
CM
OH
-40°C +25°C +85°C
MIN TYP MAX MIN TYP MAX MIN TYP MAX
-100 +100 -100 +100 -100 +100 mV
VCC -
1.085
VCC -
1.017
V
CC
0.05
VCC -
0.880
VCC -
0.983
V
CC
0.05
VCC -
0.880
-
0.05
VCC -
1.025
-
0.05
VCC -
1.025
VCC -
0.966
V
CC
0.05
VCC -
0.880
-
UNITS
V
V
Single-Ended
Output Low
Voltage
Differential Output
Voltage
POWER SUPPLY
Supply Current I
V
OL
- V
V
OH
OL
All pins open except
CC
V
CC
, G N D
VCC -
VCC -
VCC -
VCC -
VCC -
VCC -
VCC -
VCC -
1.830
1.753
1.620
1.810
1.710
1.620
1.810
1.692
595 725 595 725 595 725 mV
10 18 12 18 14 18 mA
VCC -
1.620
V
MAX9375
Single LVDS/Anything-to-LVPECL Translator
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +3.6V, differential input voltage |VID| = 0.1V to 1.2V, input frequency ≤ 1.34GHz, differential input transition time =
125ps (20% to 80%), input voltage (V
IN
, VIN) = 0 to VCC, input common-mode voltage VCM= 0.05V to (VCC- 0.05V), outputs termi-
nated with 50Ω ±1% to V
CC
- 2.0V, TA= -40°C to +85°C. Typical values are at VCC= +3.3V, |VID| = 0.2V, input common-mode volt-
age V
CM
= 1.2V, TA= +25°C, unless otherwise noted.) (Note 4)
(
)
Note 1: Measurements are made with the device in thermal equilibrium. All voltages are referenced to ground except V
THD
and VID.
Note 2: Current into a pin is defined as positive. Current out of a pin is defined as negative.
Note 3: DC parameters production tested at T
A
= +25°C and guaranteed by design and characterization over the full operating
temperature range.
Note 4: Guaranteed by design and characterization, not production tested. Limits are set at ±6 sigma.
Note 5: t
SKEW
is the magnitude difference of differential propagation delays for the same output under the same conditions; t
SKEW
=
|t
PHL
- t
PLH
|.
Note 6: Device jitter added to the input signal.
Typical Operating Characteristics
(VCC= +3.3V, differential input voltage |VID| = 0.2V, VCM= 1.2V, input frequency = 500MHz, outputs terminated with 50Ω ±1% to
V
CC
- 2.0V, TA= +25°C, unless otherwise noted.)
0
10
5
20
15
25
30
0 1000500 1500 2000
NO LOAD
SUPPLY CURRENT vs. FREQUENCY
MAX9375 toc01
FREQUENCY (MHz)
SUPPLY CURRENT (mA)
300
500
400
700
600
800
900
0 1000500 1500 2000
OUTPUT AMPLITUDE vs. FREQUENCY
MAX9375 toc02
FREQUENCY (MHz)
OUTPUT AMPLITUDE (mV)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Switching Frequency f
Propagation Delay Low to High t
Propagation Delay High to Low t
Pulse Skew |t
PLH
-t
|t
PHL
Output Low-to-High Transition
Time (20% to 80%)
Output High-to-Low Transition
Time (20% to 80%)
Added Random Jitter t
MAX
PLH
PHL
SKEW
t
t
RJ
VOH - VOL ≥ 250mV 2.0 2.5 GHz
Figure 2 250 421 600 ps
Figure 2 250 421 600 ps
Figure 2 (Note 5) 6 30 ps
Figure 2 116 220 ps
R
Figure 2 116 220 ps
F
fIN = 1.34GHz (Note 6) 0.7 2 ps
RMS
MAX9375
Single LVDS/Anything-to-LVPECL Translator
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC= +3.3V, differential input voltage |VID| = 0.2V, VCM= 1.2V, input frequency = 500MHz, outputs terminated with 50Ω ±1% to
V
CC
- 2.0V, TA= +25°C, unless otherwise noted.)
Detailed Description
The MAX9375 is a fully differential, high-speed, anything-to-LVPECL translator designed for signal rates up
to 2GHz. The MAX9375’s extremely low propagation
delay and high speed make it ideal for various highspeed network routing and backplane applications.
The MAX9375 accepts any differential input signals
within the supply rails and with a minimum amplitude of
100mV. Inputs are fully compatible with the LVDS,
LVPECL, HSTL, and CML differential signaling standards. Outputs are LVPECL and have sufficient current
to drive 50Ω transmission lines.
Inputs
Inputs have a wide common-mode range of 0.05V to
(VCC- 0.05V), which accommodates any differential
signals within rails, and requires a minimum of 100mV
to switch the outputs. This allows the MAX9375 inputs
to support virtually any differential signaling standard.
LVPECL Outputs
The MAX9375 outputs are emitter followers that require
external resistive paths to a voltage source (VT= V
CC
- 2.0V typ) more negative than worst-case VOLfor proper
static and dynamic operation. When properly terminated, the outputs generate steady-state voltage levels,
V
OL
or VOHwith fast transition edges between state
levels. Output current always flows into the termination
during proper operation.
Pin Description
PROPAGATION DELAY
vs. TEMPERATURE
450
440
430
420
410
PROPAGATION DELAY (ps)
400
390
-40 10-15 35 60 85
TEMPERATURE (°C)
t
PLH
t
PHL
MAX9375 toc03
OUTPUT RISE/FALL TIME
vs. TEMPERATURE
130
125
120
115
110
OUTPUT RISE/FALL TIME (ps)
105
100
-40 10-15 35 60 85
PIN NAME FUNCTION
1, 8 V
2 IN LVDS/Anything Noninverting Input
3 IN LVDS/Anything Inverting Input
4, 5 GND Power Supply Ground Connection
6 OUT
7 OUT
CC
t
F
t
R
TEMPERATURE (°C)
Positive Supply. Bypass from VCC to
GND with 0.1µF and 0.01µF ceramic
capacitors. Place the capacitors as
close to the device as possible with the
smaller value capacitor closest to the
device.
Differential LVPECL Inverting Output.
Terminate with 50Ω ±1% to V
Differential LVPECL Noninverting Output.
Terminate with 50Ω ±1% to V
MAX9375 toc04
CC
CC
- 2V.
- 2V.
Applications Information
Output Termination
Terminate the outputs with 50Ω to (VCC- 2V) or use
equivalent Thevenin terminations. Terminate OUT and
OUT with identical termination on each for low-output
distortion. When a single-ended signal is taken from the
differential output, terminate both OUT and OUT. Ensure
that output currents do not exceed the current limits as
specified in the Absolute Maximum Ratings. Under all
operating conditions, the device’s total thermal limits
should be observed.
Supply Bypassing
Bypass VCCto ground with high-frequency surfacemount ceramic 0.1µF and 0.01µF capacitors. Place the
capacitors as close to the device as possible with the
0.01µF capacitor closest to the device pins.
Traces
Circuit board trace layout is very important to maintain
the signal integrity of high-speed differential signals.
Maintaining integrity is accomplished in part by reducing signal reflections and skew, and increasing common-mode noise immunity.
Signal reflections are caused by discontinuities in the
50Ω characteristic impedance of the traces. Avoid discontinuities by maintaining the distance between differential traces, not using sharp corners or using vias.
Maintaining distance between the traces also increases
common-mode noise immunity. Reducing signal skew
is accomplished by matching the electrical length of
the differential traces.
MAX9375
Single LVDS/Anything-to-LVPECL Translator
_______________________________________________________________________________________ 5
Figure 1. Input Definitions
Chip Information
TRANSISTOR COUNT: 614
PROCESS: Bipolar
Figure 2. Differential Input-to-Output Propagation Delay Timing
Diagram
V
CC
V
ID
V
ID
GND
IN
IN
OUT
OUT
DIFFERENTIAL OUTPUT
WAVEFORM
OUT - OUT
20%
t
PHL
80%
VCM (MAX) = VCC - 0.05V
VCM (MIN) = 0.05V
V
ID
V
V
V
t
R
OH - VOL
OH - VOL
OH - VOL
0V DIFFERENTIAL
t
PLH
80%
0V DIFFERENTIAL
t
F
20%
V
OH
V
OL
MAX9375
Single LVDS/Anything-to-LVPECL Translator
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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
8
0.6±0.1
0.6±0.1
1
TOP VIEW
A2
e
FRONT VIEW
ÿ 0.50±0.1
D
b
E H
A1
4X S
BOTTOM VIEW
A
c
L
SIDE VIEW
8
1
DIM
A
A1
A2
b
c
D
e
E
H
L
α
S
INCHES
MIN
-
0.002
0.030
0.010
0.005
0.116
0.0256 BSC
0.116
0.188
0.016
0∞
0.0207 BSC
0.043
0.006
0.037
0.014
0.007
0.120
0.120
0.198
0.026
MAX
6∞
MILLIMETERS
MIN
0.05 0.15
0.25 0.36
0.13 0.18
2.95 3.05
2.95 3.05
4.78
0.41
MAX
- 1.10
0.950.75
0.65 BSC
5.03
0.66
0.5250 BSC
8LUMAXD.EPS
6∞0∞
α
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
REV.DOCUMENT CONTROL NO.APPROVAL
21-0036
1
J
1
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