19-2152; Rev 2; 11/02
Differential LVPECL/LVECL/HSTL
Receiver/Drivers
General Description
The MAX9321/MAX9321A are low-skew differential
receiver/drivers designed for clock and data distribu-
tion. The differential input can be adapted to accept a
single-ended input by connecting the on-chip V
BB
sup-
ply to an input as a reference voltage.
The MAX9321/MAX9321A feature ultra-low propagation
delay (172ps) and part-to-part skew (20ps) with 24mA
maximum supply current, making these devices ideal
for clock buffering or repeating. For interfacing to differ-
ential HSTL and LVPECL signals, these devices oper-
ate over a +2.25V to +3.8V supply range, allowing
high-performance clock and data distribution in sys-
tems with a nominal +2.5V or +3.3V supply. For differ-
ential LVECL operation, these devices operate from a
-2.25V to -3.8V supply. Multiple pinouts are provided to
simplify routing across a backplane to either side of a
double-sided board.
Both devices are offered in space-saving 8-pin SOT23,
SO, and µMAX packages.
Features
o
Improved Second Source of the MC10LVEP16
(MAX9321)
o
+2.25V to +3.8V Differential HSTL/LVPECL
Operation
o
-2.25V to -3.8V Differential LVECL Operation
o
Low 17mA Supply Current
o
20ps Part-to-Part Skew
o
172ps Propagation Delay
o
Minimum 300mV Output at 3GHz
o
Output Low for Open Input
o
ESD Protection >2kV (Human Body Model)
o
On-Chip Reference for Single-Ended Input
o
Available in Thermally Enhanced Exposed-Pad
SO Package
MAX9321/MAX9321A
Ordering Information
Applications
Precision Clock Buffers
Low-Jitter Data Repeaters
PART
MAX9321EKA-T
MAX9321EUA*
MAX9321ESA
MAX9321AEUA*
MAX9321AESA
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
PIN-
PACKAGE
8 SOT23-8
8 µMAX
8 SO
8 SOT23-8
8 µMAX
8 SO-EP**
TOP
MARK
AALK
—
—
AAIX
—
—
MAX9321A
EKA-T -40°C to +85°C
*Future
product—contact factory for availability.
**EP
= Exposed pad.
Pin Configurations
V
CC
1
V
EE
2
D 3
D 4
V
EE
MAX9321
V
CC
60kΩ
100kΩ
100kΩ
8 Q
7 Q
6 N.C.
5 V
BB
N.C. 1
D 2
100kΩ
D 3
MAX9321
V
CC
60kΩ
8 V
CC
7 Q
6 Q
100kΩ
V
BB
4
5 V
EE
SOT23
Pin Configurations continued at end of data sheet.
µMAX/SO
________________________________________________________________
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/LVECL/HSTL
Receiver/Drivers
MAX9321/MAX9321A
ABSOLUTE MAXIMUM RATINGS
V
CC
to V
EE
..........................................................................+4.1V
D or
D
.................................................. V
EE
- 0.3V to V
CC
+ 0.3V
D to
D
.................................................................................±3.0V
Continuous Output Current .................................................50mA
Surge Output Current........................................................100mA
V
BB
Sink/Source Current .................................................±0.6mA
Junction-to-Ambient Thermal Resistance in Still Air
8-Pin SOT23.............................................................+112°C/W
8-Pin µMAX ..............................................................+221°C/W
8-Pin SO-EP ...............................................................+53°C/W
Junction-to-Ambient Thermal Resistance with
500 LFPM 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
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,
V
BB
).............................>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
- V
EE
= +2.25V to +3.8V, outputs loaded with 50Ω ±1% to V
CC
- 2.0V. Typical values are at V
CC
- V
EE
= +3.3V, V
IHD
= V
CC
- 1V,
V
ILD
= V
CC
- 1.5V, unless otherwise noted.) (Notes 1–5)
PARAMETER
SYMBOL
CONDITIONS
MIN
DIFFERENTIAL INPUT (D,
D)
Single-Ended
Input High
Voltage
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
-
1.210
V
CC
-
1.145
V
CC
-
1.085
-40°C
TYP
MAX
MIN
+25°C
TYP
MAX
MIN
+85°C
TYP
MAX
UNITS
V
IH
V
CC
V
CC
V
CC
V
Single-Ended
Input Low
Voltage
High Voltage of
Differential
Input
Low Voltage of
Differential
Input
Differential
Input Voltage
Input High
Current
D Input Low
Current
D
Input Low
Current
V
IL
V
EE
V
CC
-
1.65
V
EE
V
CC
-
1.545
V
EE
V
CC
-
1.485
V
V
IHD
V
ILD
V
IHD
-
V
ILD
I
IH
I
ILD
I
ILD
For V
CC
- V
EE
<
3.0V
For V
CC
- V
EE
≥
3.0V
V
EE
+
1.2
V
EE
0.1
0.1
V
CC
V
CC
-
0.1
V
CC
-
V
EE
3.0
150
V
EE
+
1.2
V
EE
0.1
0.1
V
CC
V
CC
-
0.1
V
CC
-
V
EE
3.0
150
V
EE
+
1.2
V
EE
0.1
0.1
V
CC
V
CC
-
0.1
V
CC
-
V
EE
3.0
150
V
V
V
µA
µA
µA
-10
-150
100
+150
-10
-150
100
+150
-10
-150
100
+150
2
_______________________________________________________________________________________
Differential LVPECL/LVECL/HSTL
Receiver/Drivers
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
- V
EE
= +2.25V to +3.8V, outputs loaded with 50Ω ±1% to V
CC
- 2.0V. Typical values are at V
CC
- V
EE
= +3.3V, V
IHD
= V
CC
- 1V,
V
ILD
= V
CC
- 1.5V, unless otherwise noted.) (Notes 1–5)
PARAMETER
SYMBOL
CONDITIONS
MIN
DIFFERENTIAL OUTPUT (Q,
Q)
Single-Ended
Output High
Voltage
Single-Ended
Output Low
Voltage
Differential
Output Voltage
V
OH
Figure 1
V
CC
-
1.135
V
CC
-
0.885
V
CC
-
1.07
V
CC
-
0.82
V
CC
-
1.01
V
CC
-
0.76
V
-40°C
TYP
MAX
MIN
+25°C
TYP
MAX
MIN
+85°C
TYP
MAX
UNITS
MAX9321/MAX9321A
V
OL
V
OH
-
V
OL
Figure 1
V
CC
-
1.935
550
V
CC
-
1.685
V
CC
-
1.87
550
V
CC
-
1.62
V
CC
-
1.81
550
V
CC
-
1.56
V
Figure 1
mV
REFERENCE (V
BB
)
Reference
Voltage Output
(Note 6)
POWER SUPPLY
Supply Current
(Note 7)
I
EE
16
24
17
24
18
24
mA
V
BB
I
BB
=
±0.5mA
V
CC
-
1.55
V
CC
-
1.31
V
CC
-
1.445
V
CC
-
1.245
V
CC
-
1.385
V
CC
-
1.185
V
AC ELECTRICAL CHARACTERISTICS
(V
CC
- V
EE
= +2.25V to +3.8V, outputs loaded with 50Ω ±1% to V
CC
- 2V, input frequency = 1.5GHz, input transition time = 125ps
(20% to 80%), V
IHD
= V
EE
+ 1.2V to V
CC
, V
ILD
= V
EE
to V
CC
- 0.15V, V
IHD
- V
ILD
= 0.15V to the smaller of 3V or V
CC
- V
EE
. Typical
values are at V
CC
- V
EE
= 3.3V, V
IHD
= V
CC
- 1V, V
ILD
= V
CC
- 1.5V, unless otherwise noted.) (Notes 8, 11)
PARAMETER
Differential
Input-to-
Output Delay
Part-to-Part
Skew (Note 9)
Added
Random Jitter
(Note 10)
SYMBOL
t
PLHD
,
t
PHLD
t
SKPP
f
IN
= 1.5GHz, Clock
pattern
t
RJ
f
IN
= 3.0GHz, Clock
pattern
0.6
1.5
0.6
1.5
0.6
1.5
CONDITIONS
MIN
Figure 2
145
-40°C
TYP
184
MAX
235
MIN
145
+25°C
TYP
172
MAX
245
MIN
130
+85°C
TYP
167
MAX
230
ps
UNITS
25
1.7
90
2.8
20
1.7
100
2.8
20
1.7
100
2.8
ps
ps
(RMS)
_______________________________________________________________________________________
3
Differential LVPECL/LVECL/HSTL
Receiver/Drivers
MAX9321/MAX9321A
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
- V
EE
= +2.25V to +3.8V, outputs loaded with 50Ω ±1% to V
CC
- 2V, input frequency = 1.5GHz, input transition time = 125ps
(20% to 80%), V
IHD
= V
EE
+ 1.2V to V
CC
, V
ILD
= V
EE
to V
CC
- 0.15V, V
IHD
- V
ILD
= 0.15V to the smaller of 3V or V
CC
- V
EE
. Typical
values are at V
CC
- V
EE
= 3.3V, V
IHD
= V
CC
- 1V, V
ILD
= V
CC
- 1.5V, unless otherwise noted.) (Notes 8, 11)
PARAMETER
Added
Deterministic
Jitter (Note 10)
SYMBOL
CONDITIONS
MIN
t
DJ
3.0Gbps
2
23
-1 PRBS pattern
V
OH
- V
OL
≥
300mV,
Clock pattern,
Figure 2
f
MAX
V
OH
- V
OL
≥
550mV,
Clock pattern,
Figure 2
2.0
2.0
2.0
-40°C
TYP
57
MAX
80
MIN
+25°C
TYP
57
MAX
80
MIN
+85°C
TYP
57
MAX
80
ps
(p-p)
UNITS
3.0
3.0
3.0
GHz
Switching
Frequency
Output Rise/
Fall Time
(20% to 80%)
t
R
, t
F
Figure 2
50
88
120
50
89
120
50
90
120
ps
Note 1:
Guaranteed by design and characterization.
Note 2:
Measurements are made with the device in thermal equilibrium.
Note 3:
Current into a pin is defined as positive. Current out of a pin is defined as negative.
Note 4:
DC parameters production tested at T
A
= +25°C. Guaranteed by design and characterization over the full operating temp-
erature range.
Note 5:
Single-ended input operation is limited to V
CC
- V
EE
≥
3.0V.
Note 6:
Use V
BB
as a reference for inputs on the same device only.
Note 7:
All pins open except V
CC
and V
EE
.
Note 8:
Guaranteed by design and characterization. Limits are set at ±6 sigma.
Note 9:
Measured between outputs of different parts at the signal crossing points under identical conditions for a same-edge transition.
Note 10:
Device jitter added to the input signal.
4
_______________________________________________________________________________________
Differential LVPECL/LVECL/HSTL
Receiver/Drivers
Typical Operating Characteristics
(SO packages) (V
CC
= +3.3V, V
EE
= 0, input transition time = 125ps (20% to 80%), V
IHD
= V
CC
- 1V, V
ILD
= V
CC
- 1.5V, f
IN
=
1.5GHz, outputs loaded with 50Ω to V
CC
- 2V, T
A
= +25°C, unless otherwise noted.)
MAX9321/MAX9321A
SUPPLY CURRENT, I
EE
vs. TEMPERATURE
MAX9321 toc01
OUTPUT AMPLITUDE, V
OH
- V
OL
vs. FREQUENCY
0.9
0.8
OUTPUT AMPLITUDE (V)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
87
MAX9321 toc02
TRANSITION TIME vs. TEMPERATURE
90
TRANSITION TIME (ps)
MAX9321 toc03
20
19
SUPPLY CURRENT (mA)
18
17
16
15
14
-40
-15
10
35
60
1.0
89
t
F
t
R
88
0
85
0
500
1000 1500 2000 2500 3000 3500
FREQUENCY (MHz)
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
PROPAGATION DELAY vs. HIGH VOLTAGE
OF DIFFERENTIAL INPUT, V
IHD
MAX9321 toc04
PROPAGATION DELAY vs. TEMPERATURE
190
PROPAGATION DELAY (ps)
180
170
160
150
140
130
120
t
PLHD
MAX9321 toc05
200
195
190
PROPAGATION DELAY (ps)
185
180
175
170
165
160
155
150
1.0
1.4
1.8
2.2
2.6
3.0
3.4
t
PHLD
t
PLHD
V
IHD
- V
ILD
= 0.5V
200
t
PHLD
3.8
-40
-15
10
35
60
85
V
IHD
(V)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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