19-2384; Rev 0; 4/02
Differential PECL/ECL/LVPECL/LVECL
Receiver/Driver
General Description
The MAX9321B low-skew differential receiver/driver is
designed for clock and data distribution. The differen-
tial input can be adapted to accept a single-ended
input by connecting the on-chip V
BB
supply to an input
as a reference voltage.
The MAX9321B features ultra-low propagation delay
(172ps) and part-to-part skew (20ps) with 24mA maxi-
mum supply current, making this device ideal for clock
buffering or repeating. For interfacing to differential PECL
and LVPECL signals, these devices operate over a +3.0V
to +5.5V supply range, allowing high-performance clock
and data distribution in systems with a nominal 3.3V or
5.0V supply. For differential ECL and LVECL operation,
this device operates from a -3.0V to -5.5V supply.
The MAX9321B is offered in industry-standard 8-pin SO
and TSSOP packages.
Features
o
Improved Second Source of the MC10EP16D
o
+3.0V to +5.5V Differential PECL/LVPECL
Operation
o
-3.0V to -5.5V Differential ECL/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
MAX9321B
Applications
Precision Clock Buffer
Low-Jitter Data Repeater
PART
MAX9321BESA
MAX9321BEUA*
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 TSSOP
*Future
product—contact factory for availability.
Pin Configuration
D
V
IH
D
V
IL
V
BB
(CONNECTED TO D)
V
CC
N.C. 1
80kΩ
D 2
50kΩ
60kΩ
D 3
100kΩ
V
BB
4
5 V
EE
6 Q
7 Q
MAX9321B
8 V
CC
Q
V
OH
- V
OL
Q
V
OH
V
OL
TSSOP/SO
Figure 1. Switching with Single-Ended Inputs
________________________________________________________________
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 PECL/ECL/LVPECL/LVECL
Receiver/Driver
MAX9321B
ABSOLUTE MAXIMUM RATINGS
V
CC
to V
EE
.............................................................................6.0V
D or
D
...................................................V
EE
- 0.3V to V
CC
+ 0.3V
D or
D
with the Other Input Floating ....V
CC
- 5.0V 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
Continuous Power Dissipation (T
A
+70°C)
8-Pin TSSOP (derate 4.5mW/°C above +70°C) ...........362mW
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
Junction-to-Ambient Thermal Resistance in Still Air
8-Pin TSSOP ............................................................+221°C/W
8-Pin SO...................................................................+170°C/W
Junction-to-Ambient Thermal Resistance with
500 LFPM Airflow
8-Pin TSSOP ............................................................+155°C/W
8-Pin SO.....................................................................+99°C/W
Junction-to-Case Thermal Resistance
8-Pin TSSOP ..............................................................+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_)
.................................>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
= 3.0V to 5.5V, outputs loaded with 50Ω ±1% to V
CC
- 2.0V. Typical values are at V
CC
- V
EE
= 5.0V, V
IHD
= V
CC
- 1V, V
ILD
= V
CC
- 1.5V, unless otherwise noted.) (Notes 1, 2, 3)
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 (Note 4)
V
CC
-
1.21
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
-
1.61
V
EE
V
CC
-
1.545
V
EE
V
CC
-
1.485
V
V
IHD
V
EE
+
1.2
V
CC
V
EE
+
1.2
V
CC
V
EE
+
1.2
V
CC
V
V
ILD
V
IHD
-
V
ILD
I
IH
I
ILD
I
ILD
V
CC
- V
EE
≤
3.8V
V
CC
- V
EE
≥
3.8V
V
CC
- V
EE
≤
3.8V
V
CC
- V
EE
≥
3.8V
V
EE
V
CC
-
0.1
3.0
150
V
EE
V
CC
-
0.1
3.0
150
V
EE
V
CC
-
0.1
3.0
150
V
0.1
0.1
0.1
V
µA
µA
µA
-100
-140
-150
-175
+100
+140
+150
+175
-100
-140
-150
-175
+100
+140
+150
+175
-100
-140
-150
-175
+100
+140
+150
+175
2
_______________________________________________________________________________________
Differential PECL/ECL/LVPECL/LVECL
Receiver/Driver
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
- V
EE
= 3.0V to 5.5V, outputs loaded with 50Ω ±1% to V
CC
- 2.0V. Typical values are at V
CC
- V
EE
= 5.0V, V
IHD
= V
CC
- 1V, V
ILD
= V
CC
- 1.5V, unless otherwise noted.) (Notes 1, 2, 3)
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
MAX9321B
V
OL
V
OH
-
V
OL
Figure 1
V
CC
-
1.935
V
CC
-
1.68
V
CC
-
1.87
V
CC
-
1.62
V
CC
-
1.81
V
CC
-
1.56
V
Figure 1
550
820
550
820
550
820
mV
REFERENCE (V
BB
)
Reference
Voltage Output
POWER SUPPLY
Supply Current
V
BB
I
BB
=
±0.5mA
(Note 5)
V
CC
-
1.51
V
CC
-
1.31
V
CC
-
1.445
V
CC
-
1.245
V
CC
-
1.385
V
CC
-
1.185
V
I
EE
(Note 6)
16
24
17
24
18
24
mA
AC ELECTRICAL CHARACTERISTICS
(V
CC
- V
EE
= 3.0V to 5.5V, 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 3.0V. Typical values are at V
CC
- V
EE
= 5V, V
IHD
=
V
CC
- 1V, V
ILD
= V
CC
- 1.5V, unless otherwise noted.) (Notes 1, 7)
PARAMETER
Differential
Input-to-
Output Delay
Part-to-Part
Skew
SYMBOL
t
PLHD
,
t
PHLD
t
SKPP
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
(Note 8)
f
IN
= 1.5GHz, clock
pattern (Note 9)
25
1.7
0.6
90
2.8
1.5
20
1.7
0.6
100
2.8
1.5
20
1.7
0.6
100
2.8
ps
Added
Random Jitter
t
RJ
f
IN
= 3.0GHz, clock
pattern (Note 9)
1.5
ps
(RMS)
_______________________________________________________________________________________
3
Differential PECL/ECL/LVPECL/LVECL
Receiver/Driver
MAX9321B
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
- V
EE
= 3.0V to 5.5V, 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 3.0V. Typical values are at V
CC
- V
EE
= 5V, V
IHD
=
V
CC
- 1V, V
ILD
= V
CC
- 1.5V, unless otherwise noted.) (Notes 1, 7)
PARAMETER
Added
Deterministic
Jitter
SYMBOL
CONDITIONS
MIN
t
DJ
3.0Gpbs
2
23
- 1 PRBS pattern
(Note 9)
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
65
112
135
65
118
135
65
121
135
ps
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 production tested at T
A
= +25°C. Guaranteed by design and characterization over the full operating temp-
erature range.
Note 4:
Maximum differential input voltage limit of ±3V also applies to single-ended use.
Note 5:
Use V
BB
as a reference for inputs on the same device only.
Note 6:
All pins open except V
CC
and V
EE
.
Note 7:
Guaranteed by design and characterization. Limits are set at ±6 sigma.
Note 8:
Measured between outputs of different parts at the signal crossing points under identical conditions for a same-edge transition.
Note 9:
Device jitter added to the input signal.
4
_______________________________________________________________________________________
Differential PECL/ECL/LVPECL/LVECL
Receiver/Driver
Typical Operating Characteristics
(V
CC
= 5V, V
EE
= 0V, 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.)
MAX9321B
SUPPLY CURRENT, I
EE
vs. TEMPERATURE
MAX9321B toc01
OUTPUT AMPLITUDE, V
OH
- V
OL
vs. FREQUENCY
MAX9321B toc02
TRANSITION TIME vs. TEMPERATURE
125
TRANSITION TIME (ps)
120
115
110
105
100
95
90
t
F
MAX9321B toc03
19
18
SUPPLY CURRENT (mA)
17
16
15
14
0.9
0.8
OUTPUT AMPLITUDE (V)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
130
t
R
13
-40
-15
10
35
60
85
TEMPERATURE (°C)
0
0
500
1000 1500 2000 2500 3000 3500
FREQUENCY (MHz)
-40
-15
10
35
60
85
TEMPERATURE (°C)
PROPAGATION DELAY vs. HIGH VOLTAGE
OF DIFFERENTIAL INPUT, V
IHD
MAX9321B toc04
PROPAGATION DELAY vs. TEMPERATURE
MAX9321B toc05
190
V
IHD
- V
ILD
= 0.5V
185
PROPAGATION DELAY (ps)
180
175
170
165
160
t
PHLD
t
PLHD
210
200
PROPAGATION DELAY (ps)
190
180
170
160
150
t
PHLD
t
PLHD
1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6
V
IHD
(V)
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
5
Embedded System
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