19-2377; Rev 0; 4/02
LVTTL/TTL-to-Differential LVPECL/PECL
Translators
General Description
The MAX9370/MAX9371/MAX9372 LVTTL/TTL-to-differ-
ential LVPECL/PECL translators are designed for high-
speed communication signal and clock driver
applications. The MAX9370/MAX9372 are dual
LVTTL/TTL-to-LVPECL/PECL translators that operate in
excess of 1GHz. The MAX9371 is a single translator.
The MAX9370/MAX9371 operate over a wide 3.0V to
5.25V supply range, allowing high-performance clock
or data distribution in systems with a nominal 3.3V or
5.0V supply. The MAX9372 is designed to operate from
3.0V to 3.6V.
The devices default to output high if the input is discon-
nected. They feature low 270ps propagation delay. The
MAX9370/MAX9371/MAX9372 employ industry-stan-
dard flow-through pinouts. These devices are specified
for operation from -40°C to +85°C, and are offered in
space-saving, 8-pin SOT23, µMAX, and SO packages.
Features
o
Guaranteed 1GHz Operating Frequency at 600mV
Differential Output
o
270ps Propagation Delay
o
10ps Output-to-Output Skew (MAX9370/MAX9372)
o
Wide Supply Range: 3.0V to 5.25V
(MAX9370/MAX9371)
o
ESD Protection > 2kV (Human Body Model)
o
Output High with Input Open
o
Available in Small 8-Pin SOT23, µMAX, and SO
Packages
o
Improved Upgrades to MC100EL22, MC100EPT20,
MC100EPT22
MAX9370/MAX9371/MAX9372
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SOT23-8
8 µMAX
8 SO
8 SOT23-8
8 µMAX
8 SO
8 SOT23-8
8 µMAX
MAX9370EKA-T*
MAX9370EUA*
MAX9370ESA
MAX9371EKA-T*
MAX9371EUA*
MAX9371ESA
MAX9372EKA-T*
MAX9372EUA*
Applications
Precision Clock/Data Level Translation
Central Office Clock Distribution
DSLAM/DLC
Base Station
Mass Storage
Pin Configurations/Functional Diagrams appears at end of
data sheet.
MAX9372ESA
-40°C to +85°C
8 SO
*Future
product—contact factory for availability.
Typical Operating Circuit
MAX9370
MAX9371
MAX9372
Q_
TTL/LVTTL
INPUT
D
PECL/LVPECL
RECEIVER
Z
0
= 50Ω
Q_
Z
0
= 50Ω 50Ω
50Ω
V
CC
- 2.0V
________________________________________________________________
Maxim Integrated Products
1
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.
LVTTL/TTL-to-Differential LVPECL/PECL
Translators
MAX9370/MAX9371/MAX9372
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND (MAX9370/MAX9371) .......................-0.3V to +5.5V
V
CC
to GND (MAX9372) ........................................-0.3V to +4.0V
D_ to GND ..................................................-0.3V to (V
CC
+ 0.3V)
Q_,
Q_
to GND ...........................................-0.3V to (V
CC
+ 0.3V)
Continuous Output Current ................................................50mA
Surge Output Current........................................................100mA
Junction-to-Ambient Thermal Resistance in Still Air
8-Pin SOT23..............................................................+112°C/W
8-Pin µMAX…............................................................+221°C/W
8-Pin SO....................................................................+170°C/W
Junction-to-Ambient Thermal Resistance with
500LFPM Airflow
8-Pin SOT23................................................................+78°C/W
8-Pin µMAX…............................................................+155°C/W
8-Pin SO......................................................................+99°C/W
Junction-to-Case Thermal Resistance
8-Pin SOT23................................................................+80°C/W
8-Pin µMAX…..............................................................+39°C/W
8-Pin SO......................................................................+40°C/W
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)...................470mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
8-Pin SOT23 (derate 8.9mW/°C above +70°C).............714mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Soldering Temperature (10s) ...........................................+300°C
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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 3.0V to 5.25V for MAX9370/MAX9371, V
CC
= 3.0V to 3.6V for MAX9372, outputs terminated with 50Ω ±1% to V
CC
- 2.0V.
Typical values are at V
CC
= 3.3V, V
IH
= 2.4V, V
IL
= 0.4V, unless otherwise noted.) (Notes 1, 2, 3)
PARAMETER
SYMBOL
CONDITIONS
-40°C
MIN
TYP
MAX
MIN
+25°C
TYP
MAX
MIN
+85°C
TYP
MAX
UNITS
LVTTL INPUTS (D_)
Input High
Voltage
Input Low
Voltage
Input Low
Current
V
IH
V
IL
I
IL
V
D
= 0.5V
V
D
= 2.7V
Input High
Current
V
D
= V
CC
,
MAX9370/
MAX9371
V
D
= V
CC
,
MAX9372
Input Clamp
Voltage
I
IL
or I
IH
= 18mA
-1.2
-50
2.0
0.8
-100
+10
130
-50
2.0
0.8
-100
+10
130
-50
2.0
0.8
-100
+10
130
V
V
µA
I
IH
µA
20
-1.2
20
-1.2
20
V
LVPECL/PECL OUTPUTS (Q_,
Q_)
Output High
Voltage
MAX9370
V
OH
MAX9371/
MAX9372
MAX9370
V
OL
MAX9371/
MAX9372
V
CC
-
1.085
V
CC
-
1.145
V
CC
-
1.83
V
CC
-
1.945
V
CC
-
0.895
V
CC
-
0.895
V
CC
-
1.62
V
CC
-
1.695
V
CC
-
1.025
V
CC
-
1.145
V
CC
-
1.81
V
CC
-
1.945
V
CC
-
0.895
V
CC
-
0.895
V
CC
-
1.62
V
CC
-
-1.695
V
CC
-
1.025
V
CC
-
1.145
V
CC
-
1.81
V
CC
-
1.945
V
CC
-
0.895
V
CC
-
0.895
V
CC
-
1.62
V
CC
-
1.695
V
Output Low
Voltage
V
2
_______________________________________________________________________________________
LVTTL/TTL-to-Differential LVPECL/PECL
Translators
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.0V to 5.25V for MAX9370/MAX9371, V
CC
= 3.0V to 3.6V for MAX9372, outputs terminated with 50Ω ±1% to V
CC
- 2.0V.
Typical values are at V
CC
= 3.3V, V
IH
= 2.4V, V
IL
= 0.4V, unless otherwise noted.) (Notes 1, 2, 3)
PARAMETER
Differential
Output Swing
(V
OH
- V
OL
)
SUPPLY CURRENT
Power-Supply
Current
(Note 4)
I
CC
MAX9370/
MAX9372
MAX9371
18
9.5
28
16
20
10.5
28
16
22
11.5
28
16
mA
SYMBOL
CONDITIONS
-40°C
MIN
600
TYP
MAX
MIN
600
+25°C
TYP
MAX
MIN
600
+85°C
TYP
MAX
UNITS
MAX9370/MAX9371/MAX9372
mV
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 3.0V to 5.25V for MAX9370/MAX9371, V
CC
= 3.0V to 3.6V for MAX9372, outputs terminated with 50Ω ±1% to V
CC
- 2.0V, input
frequency
≤
1.0GHz, input transition time = 125ps (20% to 80%), V
IH
= 2.0V, V
IL
= 0.8V. Typical values are at V
CC
= 3.3V, V
IH
=
2.4V, V
IL
= 0.4V, unless otherwise noted.) (Note 5)
PARAMETER
Maximum
Toggle
Frequency
Input-to-
Output
Propagation
Delay
Output-to-
Output Skew
Output Rise/
Fall Time
Added
Deterministic
Jitter
Added
Random Jitter
SYMBOL
CONDITIONS
V
OH
- V
OL
≥
600mV
-40°C
MIN
1.0
TYP
1.5
MAX
MIN
1.0
+25°C
TYP
1.5
MAX
MIN
1.0
+85°C
TYP
1.5
MAX
UNITS
f
MAX
GHz
t
PLH
,
t
PHL
Figure 1
MAX9370/
MAX9372
(Note 6)
Figure 1
1Gbps 2
23
- 1
PRBS pattern
(Note 7)
1GHz clock
(Note 7)
200
270
400
200
270
400
200
270
400
ps
t
SKQQ
t
R
, t
F
10
50
7
50
7
50
ps
80
250
80
250
80
250
ps
t
DJ
40
60
40
60
40
60
ps
(P-P)
t
RJ
0.23
0.8
0.23
0.8
0.23
0.8
ps
(RMS)
Note 1:
Measurements are made with the device in thermal equilibrium.
Note 2:
Current into a pin is defined as positive. Current out of a pin is defined as negative.
Note 3:
DC parameters are production tested at T
A
= +25°C. DC limits are guaranteed by design and characterization over the full
operating temperature range.
Note 4:
All pins are open except V
CC
and GND.
Note 5:
Guaranteed by design and characterization. Limits are set to ±6 sigma.
Note 6:
Measured between outputs of the same part at the signal crossing points under identical conditions for a same-edge transition.
Note 7:
Device jitter added to the input signal.
_______________________________________________________________________________________
3
LVTTL/TTL-to-Differential LVPECL/PECL
Translators
MAX9370/MAX9371/MAX9372
Typical Operating Characteristics
(MAX9371, V
CC
= 3.3V, V
IH
= 2.4V, V
IL
= 0.4V, outputs terminated with 50Ω to V
CC
- 2V, input transition time = 125ps (20% to 80%),
T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX9370 toc01
DIFFERENTIAL OUTPUT VOLTAGE
(V
OH
- V
OL
) vs. FREQUENCY
MAX9370 toc02
TRANSITION TIME vs. TEMPERATURE
f = 100MHz
MAX9370 toc03
26
ALL INPUTS AND OUTPUTS ARE OPEN
22
SUPPLY CURRENT (mA)
MAX9370/MAX9372
18
1000
DIFFERENTIAL OUTPUT VOLTAGE (mV)
260
800
TRANSITION TIME (ps)
240
FALLING EDGE
RISING EDGE
600
220
14
MAX9371
10
400
200
200
6
-40
-15
10
35
60
85
TEMPERATURE (°C)
0
0
0.4
0.8
1.2
1.6
2.0
FREQUENCY (GHz)
180
-40
-15
10
35
60
85
TEMPERATURE (°C)
PROPAGATION DELAY vs. TEMPERATURE
MAX9370 toc04
300
290
PROPAGATION DELAY (ps)
280
270
260
250
240
-40
-15
10
35
60
85
TEMPERATURE (°C)
4
_______________________________________________________________________________________
LVTTL/TTL-to-Differential LVPECL/PECL
Translators
Pin Description for the MAX9370/MAX9372
PIN
SO
µMAX
1
2
3
4
5
6
7
8
SOT23
8
7
6
5
2
4
3
1
NAME
Q0
Q0
Q1
Q1
GND
D1
D0
V
CC
FUNCTION
Noninverting Differential LVPECL/PECL Output 0. Typically terminate with 50Ω resistor to V
CC
- 2V.
Inverting Differential LVPECL/PECL Output 0. Typically terminate with 50Ω resistor to V
CC
- 2V.
Noninverting Differential LVPECL/PECL Output 1. Typically terminate with 50Ω resistor to V
CC
- 2V.
Inverting Differential LVPECL/PECL Output 1. Typically terminate with 50Ω resistor to V
CC
- 2V.
Ground. Provide a low-impedance connection to ground plane.
LVTTL/TTL Input 1. LVTTL/TTL input for translator corresponding to output Q1 and
Q1.
LVTTL/TTL Input 0. LVTTL/TTL input for translator corresponding to output Q0 and
Q0.
Positive Supply Voltage. Bypass V
CC
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.
MAX9370/MAX9371/MAX9372
Pin Description for the MAX9371
PIN
SO
µMAX
1, 4, 6
2
3
5
7
8
NAME
SOT23
4, 5, 8
7
6
2
3
1
N.C.
Q
Q
GND
D
V
CC
No Connection. No internal connection.
Noninverting Differential LVPECL/PECL Output. Typically terminate with 50Ω resistor to V
CC
- 2V.
Inverting Differential LVPECL/PECL Output. Typically terminate with 50Ω resistor to V
CC
- 2V.
Ground. Provide a low-impedance connection to ground plane.
LVTTL/TTL Input
Positive Supply Voltage. Bypass V
CC
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.
FUNCTION
Detailed Description
The MAX9370/MAX9371/MAX9372 LVTTL/TTL-to-differ-
ential LVPECL/PECL translators are designed for high-
speed communication signal and clock driver
applications. The MAX9370/MAX9372 are dual LVTTL-
to-LVPECL/PECL translators that operate in excess of
1GHz. The MAX9371 is a single translator. The
MAX9370/MAX9371 operate over a wide 3.0V to 5.25V
supply range, allowing high-performance clock or data
distribution in systems with a nominal 3.3V or 5.0V sup-
ply. The MAX9372 is optimized for 3.0V to 3.6V opera-
tion. These devices feature low 270ps propagation
delay and 40ps peak-to-peak deterministic jitter.
Inputs and Outputs
The MAX9370/MAX9371/MAX9372 inputs accept stan-
dard LVTTL/TTL levels. The input has pullup circuitry that
drives the outputs to a differential high if the inputs are
open. The outputs are differential LVPECL/PECL levels.
Applications Information
Output Termination
Terminate outputs with 50Ω to V
CC
- 2V or use an equiv-
alent Thevenin termination. Use the same terminate on
each output for the lowest output-to-output skew. When a
single-ended signal is taken from a differential output,
terminate both outputs. For example, if Q is used as a
single-ended output, terminate both Q and
Q.
_______________________________________________________________________________________
5
