19-2846; Rev 1; 7/03
Anything-to-LVPECL/LVDS Translators
with Pin-Selectable Divide-by-Four
General Description
The MAX9377/MAX9378 are fully differential, high-
speed, low-jitter anything-to-LVPECL and anything-to-
LVDS translators, respectively, with a selectable
divide-by-four function. Low propagation delay and
high speed make them ideal for various high-speed
network routing and backplane applications at speeds
up to 2GHz in nondivide mode.
The MAX9377/MAX9378 accept any differential input
signal within the supply rails and with minimum ampli-
tude of 100mV. Inputs are fully compatible with the
LVDS, LVPECL, HSTL, and CML differential signaling
standards. The MAX9377 outputs are LVPECL and
have sufficient current to drive 50Ω transmission lines.
The MAX9378 outputs are LVDS and conform to the
ANSI EIA/TIA-644 LVDS standard.
The MAX9377/MAX9378 are available in 8-pin µMAX
packages and operate from a single +3.3V supply over
the -40°C to +85°C temperature range.
Features
o
Guaranteed 2GHz Switching Frequency
o
Accept LVDS/LVPECL/Anything Inputs
o
Pin-Selectable Divide-by-Four Function
o
421ps (typ) Propagation Delays (MAX9377)
o
30ps (max) Pulse Skew
o
2ps
RMS
(max) Random Jitter
o
Minimum 100mV Differential Input to Guarantee
AC Specifications
o
Temperature-Compensated LVPECL Output
o
+3.0V to +3.6V Power-Supply Operating Range
o
ESD Protection: >2kV Human Body Model (HBM)
MAX9377/MAX9378
Applications
Backplane Logic Standard Translation
LAN
WAN
DSLAM
DLC
PART
MAX9377EUA
MAX9378EUA
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 µMAX
Pin Configuration
TOP VIEW
RST
SEL
IN
IN
1
2
3
8
7
6
V
CC
LVDS/ANY
OUT
OUT
RST
Functional Diagram
SEL
÷
4
LVPECL (MAX9377)
OR
LVDS (MAX9378)
GND
4
MAX9377
MAX9378
5
________________________________________________________________
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.
Anything-to-LVPECL/LVDS Translators
with Pin-Selectable Divide-by-Four
MAX9377/MAX9378
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................-0.3V to +4.1V
Inputs (IN,
IN,
RST, SEL) ............................-0.3V to (V
CC
+ 0.3V)
IN to
IN................................................................................±3.0V
Short-Circuit Duration (MAX9378 OUT,
OUT)
............Continuous
Continuous Output Current .................................................50mA
Surge Output Current .......................................................100mA
Continuous Power Dissipation (T
A
= +70°C)
8-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
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 +3.6V, differential input voltage |V
ID
| = 0.1V to 3.0V, input voltage (V
IN
, V
IN
)
= 0 to V
CC
, input common-mode voltage
V
CM
= 0.05V to (V
CC
- 0.05V), LVPECL outputs terminated with 50Ω ±1% to (V
CC
- 2.0V), LVDS outputs terminated with 100Ω ±1%,
T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V, |V
ID
| = 0.2V, input common-mode voltage V
CM
= 1.2V, T
A
= +25°C, 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
LVCMOS/LVTTL INPUTS (RST, SEL)
Input High
Voltage
Input Low Voltage
Input High Current
Input Low Current
Differential Input
Threshold
Input Current
Input Common-
Mode Voltage
V
IH
V
IL
I
IH
I
IL
V
IN
= V
CC
or 2V
V
IL
= 0 or 0.8V
2.0
GND
0
-20
V
CC
0.8
150
+20
2.0
GND
0
-20
V
CC
0.8
150
+20
2.0
GND
0
-20
V
CC
0.8
150
+20
V
V
µA
µA
DIFFERENTIAL INPUTS (IN,
IN)
V
THD
I
IN
, I
IN
V
CM
V
IN
, V
IN
= V
CC
or 0V
Figure 1
-100
-20
0.05
±6
+100
+20
V
CC
-
0.05
-100
-20
0.05
±6
+100
+20
V
CC
-
0.05
-100
-20
0.05
±6
+100
+20
V
CC
-
0.05
mV
µA
V
LVPECL OUTPUTS (OUT,
OUT)
(MAX9377)
Single-Ended
Output High
Voltage
Single-Ended
Output Low
Voltage
Differential Output
Voltage
V
OH
Figure 3
V
CC
-
1.085
V
CC
-
1.033
V
CC
- V
CC
- V
CC
-
0.880 1.025 0.992
V
CC
-
0.880
V
CC
- V
CC
-
1.025 0.978
V
CC
-
0.880
V
V
OL
V
OH
-
V
OL
Figure 3
V
CC
-
1.830
595
V
CC
-
1.755
725
V
CC
- V
CC
- V
CC
-
1.620 1.810 1.717
595
725
V
CC
-
1.620
V
CC
- V
CC
-
1.810 1.699
595
725
V
CC
-
1.620
V
Figure 3
mV
LVDS OUTPUTS (OUT,
OUT)
(MAX9378)
Differential Output
Voltage
V
OD
Figure 2
250
370
450
250
363
450
250
348
450
mV
2
_______________________________________________________________________________________
Anything-to-LVPECL/LVDS Translators
with Pin-Selectable Divide-by-Four
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, differential input voltage |V
ID
| = 0.1V to 3.0V, input voltage (V
IN
, V
IN
)
= 0 to V
CC
, input common-mode voltage
V
CM
= 0.05V to (V
CC
- 0.05V), LVPECL outputs terminated with 50Ω ±1% to (V
CC
- 2.0V), LVDS outputs terminated with 100Ω ±1%,
T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V, |V
ID
| = 0.2V, input common-mode voltage V
CM
= 1.2V, T
A
= +25°C, unless
otherwise noted.) (Notes 1, 2, 3)
PARAMETER
Change in
Magnitude of V
OD
Between
Complementary
Output States
Offset Common-
Mode Voltage
Change in
Magnitude of V
OS
Between
Complementary
Output States
Output Short-
Circuit Current,
Either Output
Shorted to GND
Output Short-
Circuit Current,
Outputs Shorted
Together
POWER SUPPLY
MAX9377, all pins
open except V
CC
,
GND
Supply Current
I
CC
MAX9378, R
L
= 100,
quiescent, inputs are
open
18.0
30
20
30
22
30
13
22
15
22
17
22
mA
SYMBOL
CONDITIONS
-40°C
MIN
TYP
MAX
MIN
+25°C
TYP
MAX
MIN
+85°C
TYP
MAX
UNITS
MAX9377/MAX9378
∆V
OD
Figure 2
1.0
20
1.0
20
1.0
20
mV
V
OS
Figure 2
1.125
1.375 1.125 1.250
1.375
1.125
1.375
V
∆V
OS
Figure 2
0.1
20
0.1
20
0.1
20
mV
I
OS
V
ID
=
±100mV,
one
output GND, other
output open or
shorted to GND
V
ID
=
±100mV,
V
OUT
= V
OUT
19.0
24
19.0
24
19.0
24
mA
I
OSAB
4.0
12
4.0
12
4.0
12
mA
_______________________________________________________________________________________
3
Anything-to-LVPECL/LVDS Translators
with Pin-Selectable Divide-by-Four
MAX9377/MAX9378
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, differential input voltage |V
ID
| = 0.1V to 1.2V, input frequency
≤
1.34GHz, differential input transition time =
125ps (20% to 80%), input voltage (V
IN
, V
IN
) = 0 to V
CC
, input common-mode voltage V
CM
= 0.05V to (V
CC
- 0.05V), LVPECL outputs
terminated with 50Ω ±1% to (V
CC
- 2.0V) MAX9377, LVDS outputs terminated with R
L
= 100Ω ±1% (MAX9378), T
A
= -40°C to +85°C.
Typical values are at V
CC
= +3.3V, |V
ID
| = 0.2V, input common-mode voltage V
CM
= 1.2V, T
A
= +25°C, unless otherwise noted.)
(Note 4)
PARAMETER
Reset-to-Differential Output Low
Delay
Reset-to-Input Clock Setup Time
Clock-to-Divider Output
Propagation Delay
SEL to Switched Output Delay
MAX9377
Switching Frequency
Propagation Delay Low to High
Propagation Delay High to Low
Pulse Skew |t
PLH
-t
PHL
|
Output Low-to-High Transition
Time (20% to 80%)
Output High-to-Low Transition
Time (20% to 80%)
Added Random Jitter
MAX9378
Switching Frequency
Propagation Delay Low to High
Propagation Delay High to Low
Pulse Skew |t
PLH
- t
PHL
|
Output Low-to-High Transition
Time (20% to 80%)
Output High-to-Low Transition
Time (20% to 80%)
Added Random Jitter
f
MAX
t
PLH
t
PHL
t
SKEW
t
R
t
F
t
RJ
V
OD
≥
250mV
Figure 3, SEL = 0
Figure 3, SEL = 0
Figure 3 (Note 6)
Figure 2
Figure 2
f
IN
= 1.34GHz (Note 7), SEL = 0
2.0
250
250
2.5
363
367
3
93
93
0.8
600
600
30
220
220
2
GHz
ps
ps
ps
ps
ps
ps
(RMS)
f
MAX
t
PLH
t
PHL
t
SKEW
t
R
t
F
t
RJ
V
OH
- V
OL
≥
250mV
Figure 3, SEL = 0
Figure 3, SEL = 0
(Note 6)
Figure 3
Figure 3
f
IN
= 1.34GHz (Note 7), SEL = 0
2.0
250
250
2.5
421
421
6
116
116
0.7
600
600
30
220
220
2
GHz
ps
ps
ps
ps
ps
ps
(RMS)
SYMBOL
t
DR
t
SET
t
PCO
t
SEL
Figure 4
Figure 4
Figure 4 (Note 5)
Figure 5
0.5
0.6
0.3
1.0
0.6
CONDITIONS
MIN
TYP
0.8
MAX
1.0
UNITS
ns
ns
ns
ns
Note 1:
Measurements are made with the device in thermal equilibrium. All voltages are referenced to ground except V
THD
, V
ID
,
V
OD
, and
∆V
OD
.
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
PCO
is the delay associated with the frequency-divider function. The total delay when divide-by-four is selected is t
PCO
+
t
PLH
.
Note 6:
t
SKEW
is the magnitude difference of differential propagation delays for the same output under same conditions; t
SKEW
=
|t
PHL
- t
PLH
|.
Note 7:
Device jitter added to the input signal.
4
_______________________________________________________________________________________
Anything-to-LVPECL/LVDS Translators
with Pin-Selectable Divide-by-Four
Typical Operating Characteristics
(V
CC
= +3.3V, differential input voltage |V
ID
| = 0.2V, V
CM
= 1.2V, input frequency = 500MHz, outputs terminated with 50Ω ±1% to
V
CC
- 2.0V (MAX9377), outputs terminated with 100Ω ±1% (MAX9378), T
A
= +25°C, unless otherwise noted.)
PROPAGATION DELAY
vs. TEMPERATURE
MAX9377/78 toc02
MAX9377/MAX9378
SUPPLY CURRENT vs. FREQUENCY
MAX9377/78 toc01
OUTPUT AMPLITUDE vs. FREQUENCY
900
800
OUTPUT AMPLITUDE (mV)
MAX9377
700
600
500
400
300
MAX9378
500
480
PROPAGATION DELAY (ps)
460
440
420
400
380
360
340
320
MAX9377 NO LOAD
40
SUPPLY CURRENT (mA)
t
PLH
(MAX9377)
t
PHL
(MAX9377)
30
MAX9378
MAX9377
t
PLH
(MAX9378)
20
10
t
PHL
(MAX9378)
0
0
500
1000
FREQUENCY (MHz)
1500
2000
300
0
500
1000
FREQUENCY (MHz)
1500
2000
-40
-15
10
35
60
85
TEMPERATURE (°C)
OUTPUT RISE/FALL TIME
vs. TEMPERATURE
MAX9377/78 toc04
140
130
OUTPUT RISE/FALL TIME (ps)
120
110
t
R
(MAX9377)
100
90
80
70
-40
-15
10
35
60
t
R
(MAX9378)
t
F
(MAX9378)
t
F
(MAX9377)
85
TEMPERATURE (°C)
_______________________________________________________________________________________
MAX9377/78 toc03
50
5
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