MAXIM MAX9321, MAX9321A User Manual
General Description
The MAX9321/MAX9321A are low-skew differential
receiver/drivers designed for clock and data distribution. The differential input can be adapted to accept a
single-ended input by connecting the on-chip VBBsupply 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 differential HSTL and LVPECL signals, these devices operate over a +2.25V to +3.8V supply range, allowing
high-performance clock and data distribution in systems with a nominal +2.5V or +3.3V supply. For differential 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.
Applications
Precision Clock Buffers
Low-Jitter Data Repeaters
Features
♦ Improved Second Source of the MC10LVEP16
(MAX9321)
♦ +2.25V to +3.8V Differential HSTL/LVPECL
Operation
♦ -2.25V to -3.8V Differential LVECL Operation
♦ Low 17mA Supply Current
♦ 20ps Part-to-Part Skew
♦ 172ps Propagation Delay
♦ Minimum 300mV Output at 3GHz
♦ Output Low for Open Input
♦ ESD Protection >2kV (Human Body Model)
♦ On-Chip Reference for Single-Ended Input
♦ Available in Thermally Enhanced Exposed-Pad
SO Package
MAX9321/MAX9321A
Differential LVPECL/LVECL/HSTL
Receiver/Drivers
________________________________________________________________ Maxim Integrated Products 1
Pin Configurations
19-2152; Rev 2; 11/02
Ordering Information
*Future product—contact factory for availability.
**EP = Exposed pad.
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.
Pin Configurations continued at end of data sheet.
PART
MAX9321EKA-T -40°C to +85°C 8 SOT23-8 AALK
MAX9321EUA* -40°C to +85°C 8 µMAX —
MAX9321ESA -40°C to +85°C 8 SO —
M A X9 3 2 1 A E KA- T -40°C to +85°C 8 SOT23-8 AAIX
MAX9321AEUA* -40°C to +85°C 8 µMAX —
MAX9321AESA -40°C to +85°C 8 SO-EP** —
TEMP
RANGE
PINPACKAGE
TOP
MARK
V
1
CC
V
2
EE
D
3
D
4
60kΩ
100kΩ
V
MAX9321
V
CC
100kΩ
EE
SOT23
Q
8
Q
7
N.C.
6
V
5
BB
N.C.
V
1
D
2
3
D
4
BB
100kΩ
MAX9321
V
CC
60kΩ
100kΩ
µMAX/SO
V
8
CC
Q
7
Q
6
V
5
EE
MAX9321/MAX9321A
Differential LVPECL/LVECL/HSTL
Receiver/Drivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC- VEE= +2.25V to +3.8V, outputs loaded with 50Ω ±1% to VCC- 2.0V. Typical values are at VCC- VEE= +3.3V, V
IHD
= VCC- 1V,
V
ILD
= VCC- 1.5V, unless otherwise noted.) (Notes 1–5)
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 VEE..........................................................................+4.1V
D or D .................................................. V
EE
- 0.3V to VCC+ 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
-40°C +25°C +85°C
PARAMETER
CONDITIONS
UNITS
DIFFERENTIAL INPUT (D, D)
Single-Ended
Input High
Voltage
V
IH
VBB connected to D
(V
IL
for V
BB
connected to D),
Figure 1
V
CC
-
1.210
VCC -
1.145
VCC -
1.085
V
Single-Ended
Input Low
Voltage
V
IL
VBB connected to D
(V
IH
for V
BB
connected to D),
Figure 1
V
EE
VCC -
V
High Voltage of
Differential
Input
VEE +
1.2
VEE +
1.2
VEE +
1.2
V
Low Voltage of
Differential
Input
V
ILD
V
EE
V
EE
V
0.1
0.1
0.1
Differential
Input Voltage
V
IHD
-
V
ILD
0.1 3.0 0.1
0.1
V
Input High
Current
I
IH
µA
D Input Low
Current
I
ILD
-10
-10
-10
µA
D Input Low
Current
I
ILD
µA
SYMBOL
MIN TYP MAX MIN TYP MAX MIN TYP MAX
V
IHD
For VCC - VEE < 3.0V
For VCC - VEE ≥ 3.0V
V
CC
V
EE
VCC -
V
EE
VCC -
1.65
V
CC
0.1
V
EE
VCC -
V
EE
-150 +150 -150 +150 -150 +150
150 150 150
100
V
CC
VCC -
1.545
V
CC
VCC -
0.1
VCC -
V
EE
3.0
100
V
CC
1.485
V
CC
VCC -
0.1
VCC -
V
EE
3.0
100
MAX9321/MAX9321A
Differential LVPECL/LVECL/HSTL
Receiver/Drivers
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC- VEE= +2.25V to +3.8V, outputs loaded with 50Ω ±1% to VCC- 2.0V. Typical values are at VCC- VEE= +3.3V, V
IHD
= VCC- 1V,
V
ILD
= VCC- 1.5V, unless otherwise noted.) (Notes 1–5)
AC ELECTRICAL CHARACTERISTICS
(VCC- VEE= +2.25V to +3.8V, outputs loaded with 50Ω ±1% to VCC- 2V, input frequency = 1.5GHz, input transition time = 125ps
(20% to 80%), V
IHD
= VEE+ 1.2V to VCC, V
ILD
= VEEto VCC- 0.15V, V
IHD
- V
ILD
= 0.15V to the smaller of 3V or VCC- VEE. Typical
values are at V
CC
- VEE= 3.3V, V
IHD
= VCC- 1V, V
ILD
= VCC- 1.5V, unless otherwise noted.) (Notes 8, 11)
PARAMETER SYMBOL CONDITIONS
DIFFERENTIAL OUTPUT (Q, Q)
Single-Ended
Output High
Voltage
Single-Ended
Output Low
Voltage
Differential
Output Voltage
REFERENCE (VBB)
Reference
Voltage Output
(Note 6)
POWER SUPPLY
Supply Current
(Note 7)
V
V
V
OH
V
V
I
Figure 1
OH
Figure 1
OL
Figure 1 550 550 550 mV
OL
IBB = ±0.5mA
BB
EE
-40°C +25°C +85°C
MIN TYP MAX MIN TYP MAX MIN TYP MAX
V
CC
1.135
V
CC
1.935
V
CC
1.55
-
-
-
VCC -
0.885
VCC -
1.685
VCC -
16 24 17 24 18 24 mA
1.31
VCC -
1.07
VCC -
1.87
VCC -
1.445
VCC -
0.82
VCC -
1.62
VCC -
1.245
VCC -
1.01
VCC -
1.81
VCC -
1.385
V
-
CC
0.76
VCC -
1.56
VCC -
1.185
UNITS
V
V
V
PARAMETER SYMBOL CONDITIONS
Differential
Input-toOutput Delay
Part-to-Part
Skew (Note 9)
Added
Random Jitter
(Note 10)
t
,
PLHD
t
PHLD
t
SKPP
t
RJ
Figure 2 145 184 235 145 172 245 130 167 230 ps
fIN = 1.5GHz, Clock
pattern
fIN = 3.0GHz, Clock
pattern
MIN TYP MAX MIN TYP MAX MIN TYP MAX
-40°C +25°C +85°C
25 90 20 100 20 100 ps
1.7 2.8 1.7 2.8 1.7 2.8
0.6 1.5 0.6 1.5 0.6 1.5
UNITS
ps
(RMS)
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