19-2326; Rev 0; 1/02
Differential LVPECL-to-LVDS Translators
General Description
The MAX9374 and MAX9374A are 2.0GHz differential
LVPECL-to-LVDS translators and are designed for tele-
com applications. They feature 250ps propagation
delay. The differential output conforms to the ANSI
TIA/EIA-644 LVDS standard. The inputs are biased with
internal resistors such that the output is differential low
when inputs are open. An on-chip V
BB
reference output
is available for single-ended operation.
The MAX9374 is designed for low-voltage operation
from a 2.375V to 2.625V power supply for use in 2.5V
systems. The MAX9374A is designed for 3.0V to 3.6V
operation in systems with a nominal 3.3V supply. Both
devices are offered in industry-standard 8-pin SOT23
and SO packages.
o
250ps (typ) Propagation Delay
o
1.0ps RMS Jitter (typ)
o
2.375V to 2.625V Low-Voltage Supply Range
(MAX9374)
o
On-Chip V
BB
Reference for Single-Ended Input
o
Output Low for Open Inputs
o
Output Conforms to ANSI TIA/EIA-644 LVDS
Standard
o
ESD Protection >2.0kV (Human Body Model)
o
Available in Small 8-Pin SOT23 Package
Features
o
Guaranteed 2.0GHz Operating Frequency
MAX9374/MAX9374A
Applications
Precision Clock Buffer
Low-Jitter Data Repeater
Central Office Clock Distribution
DSLAM/DLC
Base Station
Mass Storage
PART
MAX9374EKA-T
MAX9374ESA
MAX9374AEKA-T
MAX9374AESA
Ordering Information
TEMP
RANGE
-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 SO
8 SOT23-8
8 SO
TOP
MARK
AAKU
—
AAKV
—
Pin Configurations/Functional Diagrams appear at end of
data sheet.
Typical Application Circuit
LVDS RECEIVER
MAX9374/MAX9374A
Z
0
= 50Ω
D
LVPECL
INPUT
D
Q
Z
0
= 50Ω
Q
100Ω
________________________________________________________________
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.
Differential LVPECL-to-LVDS Translators
MAX9374/MAX9374A
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND...........................................................................4.0V
V
D
, V
D
to GND ..............................................-0.3V to V
CC
+ 0.3V
V
D
to V
D
................................................................................3.0V
V
BB
Sink/Source Current.......................................................1mA
Short-Circuit Duration (Q,
Q
to GND).........................Continuous
Short-Circuit Duration (Q to
Q)...................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SOT23 (derate 8.9mW/°C above +70°C)............714mW
8-Pin SO (derate 5.9mW/°C above +70°C)..................470mW
Junction-to-Ambient Thermal Resistance
8-Pin SOT23.............................................................+112°C/W
8-Pin SO...................................................................+170°C/W
Junction-to-Ambient Thermal Resistance with
500 LFPM Airflow
8-Pin SOT23...............................................................+78°C/W
8-Pin SO.....................................................................+99°C/W
Junction-to-Case Thermal Resistance
8-Pin SOT23...............................................................+80°C/W
8-Pin SO.....................................................................+40°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
ESD Protection
Human Body Model (D,
D,
Q,
Q)
.......................................2kV
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
= 2.375V to 2.625V for MAX9374, V
CC
= 3.0V to 3.6V for MAX9374A, 100Ω ±1% across outputs, V
ID
= 0.095V to V
CC
or 3V,
whichever is less, V
IHD
= 1.2V to V
CC
, V
ILD
= GND to V
CC
- 0.095V, unless otherwise noted. Typical values are at V
IHD
= 2.0V, V
ILD
=
1.85V, V
CC
= 3.3V for MAX9374A, V
CC
= 2.5V for MAX9374.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
-40°C
MIN
TYP
MAX
MIN
+25°C
TYP
MAX
MIN
+85°C
TYP
MAX
UNITS
DIFFERENTIAL INPUT (D,
D)
High Voltage of
Differential Input
Low Voltage of
Differential Input
V
IHD
V
ILD
Figure 1
Figure 1
V
BB
connected
to
D
(V
IL
for
V
BB
connected
to D), Figure 1
V
BB
connected
to
D
(V
IH
for
V
BB
connected
to D), Figure 1
V
CC
< 3.0V
V
CC
≥
3.0V
V
IHMAX
, V
ILMIN
(Note 3)
Figure 1
Figure 1
Figure 1
0.9
250
350
450
1.2
GND
V
CC
1.2
V
CC
1.2
V
CC
V
CC
-
0.095
V
V
V
CC
-
GND
0.095
V
CC
-
GND
0.095
Single-Ended Input
High Voltage
V
IH
V
CC
-
1.165
V
CC
V
CC
-
1.165
V
CC
V
CC
-
1.165
V
CC
V
Single-Ended Input
Low Voltage
V
IL
V
EE
V
CC
-
1.475
V
CC
3.0
150
V
EE
V
CC
-
1.475
V
CC
3.0
150
V
EE
V
CC
-
1.475
V
CC
3.0
150
V
Differential Input Voltage
Input Current
V
IHD
-
V
ILD
I
IN
0.1
0.1
-150
0.1
0.1
-150
0.1
0.1
-150
V
µA
DIFFERENTIAL OUTPUT (Q,
Q)
Output High Voltage
Output Low Voltage
Differential Output
Voltage
V
OH
V
OL
V
OD
1.6
0.9
250
350
450
1.6
0.9
250
350
450
1.6
V
V
mV
2
_______________________________________________________________________________________
Differential LVPECL-to-LVDS Translators
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.375V to 2.625V for MAX9374, V
CC
= 3.0V to 3.6V for MAX9374A, 100Ω ±1% across outputs, V
ID
= 0.095V to V
CC
or 3V,
whichever is less, V
IHD
= 1.2V to V
CC
, V
ILD
= GND to V
CC
- 0.095V, unless otherwise noted. Typical values are at V
IHD
= 2.0V, V
ILD
=
1.85V, V
CC
= 3.3V for MAX9374A, V
CC
= 2.5V for MAX9374.) (Notes 1, 2)
PARAMETER
Change in V
OD
Between
Complementary Output
States
Output Offset Voltage
Change in V
OS
Between
Complementary Output
States
Output Short-Circuit
Current
V
BB
AND SUPPLY
Reference Voltage
Supply Current
V
BB
I
CC
I
BB
= ±0.6mA
(Note 4)
(Note 5)
V
CC
-
1.38
16
V
CC
- V
CC
-
1.26 1.38
30
18
V
CC
- V
CC
-
1.26 1.38
30
20
V
CC
-
1.26
30
V
mA
SYMBOL
∆V
OD
V
OS
∆V
OS
Q or
Q
short to
GND
1.125
CONDITIONS
-40°C
TYP MAX
1
25
+25°C
MIN TYP MAX
1
1.25
3
25
1.375 1.125
25
+85°C
MIN TYP MAX
1
1.25
3
25
1.375
25
UNITS
MAX9374/MAX9374A
MIN
mV
V
mV
1.25 1.375 1.125
3
25
I
OSC
23
30
23
30
23
30
mA
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.375V to 2.625V for MAX9374, V
CC
= 3.0V to 3.6V for MAX9374A, 100Ω ±1% across outputs, V
IHD
- V
ILD
= 0.15V to V
CC
or
3V, whichever is less, V
IHD
= 1.2V to V
CC
, V
ILD
= GND to V
CC
- 0.15V, f
IN
= 1GHz, input transition time = 125ps, input duty cycle =
50%, unless otherwise noted. Typical values are at V
IHD
= 2.0V, V
ILD
= 1.85V, V
CC
= 3.3V for MAX9374A, V
CC
= 2.5V for MAX9374,
unless otherwise noted.) (Notes 1, 6)
PARAMETER
Differential Input to
Differential Output Delay
Single-Ended Input to
Differential Output Delay
Part-to-Part Skew
Added Random Jitter
(Note 8)
SYMBOL
t
PLHD
,
t
PHLD
t
PLHS
,
t
PHLS
t
SKPP
CONDITIONS
Figure 1
Figure 1
(Note 7)
f
IN
= 1.0GHz,
clock pattern
f
IN
= 2.0GHz,
clock pattern
f
IN
= 2.0Gbps,
2
23
-1 PRBS
pattern
V
OD
≥
250mV
20% to 80%,
Figure 1
2.0
0.9
0.8
-40°C
MIN
116
126
TYP
240
250
MAX
420
430
304
2
2
1
0.9
MIN
128
138
+25°C
TYP
250
250
MAX
403
415
275
2
2
1
0.9
MIN
145
155
+85°C
TYP
260
260
MAX
440
450
295
2
ps
(RMS)
2
UNITS
ps
ps
ps
t
RJ
Added Deterministic
Jitter (Note 8)
Operating Frequency
Output Rise/Fall Time
t
DJ
f
MAX
t
R
, t
F
45
2.2
92
75
2.0
200
46
2.2
91
75
2.0
200
38
2.2
90
75
ps
(P-P)
MHz
200
ps
_______________________________________________________________________________________
3
Differential LVPECL-to-LVDS Translators
MAX9374/MAX9374A
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.375V to 2.625V for MAX9374, V
CC
= 3.0V to 3.6V for MAX9374A, 100Ω ±1% across outputs, V
IHD
- V
ILD
= 0.15V to V
CC
or
3V, whichever is less, V
IHD
= 1.2V to V
CC
, V
ILD
= GND to V
CC
- 0.15V, f
IN
= 1GHz, input transition time = 125ps, input duty cycle =
50%, unless otherwise noted. Typical values are at V
IHD
= 2.0V, V
ILD
= 1.85V, V
CC
= 3.3V for MAX9374A, V
CC
= 2.5V for MAX9374,
unless otherwise noted.) (Notes 1, 6)
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Measurements are made with the device in thermal equilibrium.
DC parameters are production tested at T
A
= +25°C and guaranteed by design over the full operating temperature range.
Current into a pin is defined as positive. Current out of a pin is defined as negative.
Use V
BB
as a reference for inputs on the same device only.
100Ω across the outputs, all other pins open except V
CC
and GND.
Guaranteed by design and characterization. Limits are set at ±6 sigma.
Measured between outputs of different parts at the signal crossing points under identical conditions for a same-edge transition.
Device jitter added to the input signal.
Typical Operating Characteristics
(MAX9374A, 100Ω ±1% across outputs, f
IN
= 1GHz, input transition time = 125ps, input duty cycle = 50%, V
CC
= 3.3V, V
IHD
= 2.0V,
V
ILD
= 1.85V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
DIFFERENTIAL OUTPUT VOLTAGE (mV)
100Ω LOAD
22
SUPPLY CURRENT (mA)
20
18
16
14
12
10
-40
-15
10
35
60
85
TEMPERATURE (°C)
MAX9374 toc01
DIFFERENTIAL OUTPUT VOLTAGE (V
OD
)
vs. FREQUENCY
400
350
300
250
200
150
100
0.1
0
2.2
V
OD
120
RANDOM JITTER (ps
RMS
)
2
RISE/FALL TIME (ps)
MAX9374 toc02
RISE/FALL TIME vs. TEMPERATURE
MAX9374 toc03
24
3
140
100
RISE
JITTER
1
80
FALL
60
40
-40
-15
10
35
60
85
TEMPERATURE (°C)
0.4
0.7
1.0
1.3
1.6
1.9
FREQUENCY (GHz)
PROPAGATION DELAY vs. HIGH VOLTAGE
OF DIFFERENTIAL INPUT (V
IHD
)
MAX9374 toc04
PROPAGATION DELAY vs. TEMPERATURE
MAX9374 toc05
280
300
PROPAGATION DELAY (ps)
PROPAGATION DELAY (ps)
260
280
240
260
220
240
200
220
180
1.2
1.5
1.8
2.1
2.4
2.7
3.0
3.3
V
IHD
(V)
200
-40
-15
10
35
60
85
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Differential LVPECL-to-LVDS Translators
Pin Description
PIN
SOT23
1
2
3
4
5
6
7
8
SO
4
5
3
2
8
7
6
1
NAME
FUNCTION
Reference Output Voltage. Connect to the inverting or noninverting data input to provide a reference
for single-ended operation. When used, bypass with a 0.01µF ceramic capacitor to V
CC
; otherwise,
leave it open.
Ground. Provide a low-impedance connection to the ground plane.
Inverted LVPECL Data Input. 36.5kΩ pullup to V
CC
and 75kΩ pulldown to GND.
Noninverted LVPECL Data Input. 75kΩ pullup to V
CC
and 75kΩ pulldown to GND.
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.
Noninverted LVDS Output. Typically terminate with 100Ω to
Q.
Inverted LVDS Output. Typically terminate with 100Ω to Q.
No Connection. Not internally connected.
MAX9374/MAX9374A
V
BB
GND
D
D
V
CC
Q
Q
N.C.
D
V
IHD
- V
ILD
D
t
PLH_
t
PHL_
V
IHD
V
ILD
Q
V
OD
Q
V
OS
V
OH
V
OL
80%
80%
0 (DIFFERENTIAL)
20%
0 (DIFFERENTIAL)
20%
(Q) - (Q)
t
R
t
F
Figure 1. MAX9374/MAX9374A Timing Diagram
_______________________________________________________________________________________
5
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