19-2688; Rev 0; 1/03
Differential 8:1 ECL/PECL Multiplexer with
Dual Output Buffers
General Description
The MAX9389 is a fully differential, high-speed, low-jitter,
8-to-1 ECL/PECL multiplexer (mux) with dual output
buffers. The device is designed for clock and data distri-
bution applications, and features extremely low propa-
gation delay (310ps typ) and output-to-output skew
(30ps max).
Three single-ended select inputs, SEL0, SEL1, and SEL2,
control the mux function. The mux select inputs are com-
patible with ECL/PECL logic, and are internally refer-
enced to the on-chip reference output (V
BB1
, V
BB2
),
nominally V
CC
- 1.425V. The select inputs accept signals
between V
CC
and V
EE
. Internal pulldowns to V
EE
ensure
a low default condition if the select inputs are left open.
The differential inputs D_,
D_
can be configured to
accept a single-ended signal when the unused comple-
mentary input is connected to the on-chip reference
output (V
BB1
, V
BB2
). All the differential inputs have
internal bias and clamping circuits that ensure a low
output state when the inputs are left open.
The MAX9389 operates with a wide supply range V
CC
-
V
EE
of 2.375V to 5.5V. The device is offered in 32-pin
TQFP and thin QFN packages, and operates over the
-40°C to +85°C extended temperature range.
o
310ps Propagation Delay
o
Guaranteed 2.7GHz Operating Frequency
o
0.3ps
RMS
Random Jitter
o
<30ps Output-to-Output Skew
o
-2.375V to -5.5V Supplies for Differential
LVECL/ECL
o
+2.375V to +5.5V Supplies for Differential
LVPECL/PECL
o
Outputs Low for Open Inputs
o
Dual Output Buffers
o
>2kV ESD Protection (Human Body Model)
Features
MAX9389
Ordering Information
PART
MAX9389EHJ
MAX9389ETJ*
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 TQFP
32 Thin QFN
*Future
product—contact factory for availability.
Applications
High-Speed Telecom and Datacom Applications
Central-Office Backplane Clock Distribution
DSLAM/DLC
D0
D0
D1
Functional Diagram
MAX9389
Pin Configurations
SEL2
D1
D2
V
CC
V
EE
TOP VIEW
V
CC
V
CC
V
EE
Q0
Q0
Q1
Q1
32
V
CC
V
BB2
V
BB1
D0
D0
D1
D1
V
CC
1
2
3
4
5
6
7
8
9
D2
10
D2
11
D3
12
D3
13
D4
14
D4
15
D5
31
30
29
28
27
26
D2
D3
D3
24
SEL1
23
SEL0
D5
22
V
CC
D5
21
D7
D4
D4
MUX
8:1
25
Q0
Q0
Q1
Q1
V
BB1
V
BB2
MAX9389
D6
D6
D7
D7
SEL0
232kΩ
D_
D_
165kΩ
180kΩ
V
EE
180kΩ
V
CC
180kΩ
20
D7
19
D6
18
D6
17
V
EE
16
D5
SEL1
SEL2
TQFP
V
EE
Pin Configurations continued at end of data sheet.
________________________________________________________________
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 8:1 ECL/PECL Multiplexer with
Dual Output Buffers
MAX9389
ABSOLUTE MAXIMUM RATINGS
V
CC
- V
EE
..............................................................-0.3V to +6.0V
Inputs (D_,
D_,
SEL_) to 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 ..............................................±600µA
Continuous Power Dissipation (T
A
= +70°C)
32-Lead TQFP (derate 13.1mW/°C above +70°C) ...1047mW
θ
JA
in Still Air..........................................................+76°C/W
θ
JC
.........................................................................+25°C/W
32-Lead QFN (derate 21.3mW/°C above +70°C) .....1702mW
θ
JA
in Still Air..........................................................+47°C/W
θ
JC
...........................................................................+2°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_,
SEL_, 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
= 2.375V to 5.5V, outputs loaded with 50Ω
±1%
to V
CC
- 2V. 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 1–4)
PARAMETER
SYMBOL
CONDITIONS
-40°C
MIN
TYP
MAX
MIN
+25°C
TYP
MAX
MIN
+85°C
TYP
MAX
UNITS
INPUT (D_,
D_,
SEL_)
Single-Ended
Input High
Voltage
Single-Ended
Input Low
Voltage
Differential Input
High Voltage
Differential Input
Low Voltage
V
IH
V
BB_
connected to the
unused input, Figure 1
V
CC
-
1.225
V
CC
-
0.880
V
CC
-
1.225
V
CC
-
0.880
V
CC
-
1.225
V
CC
-
0.880
V
V
IL
V
BB_
connected to the
unused input, Figure 1
Figure 1
Figure 1
V
CC
- V
EE
<
3.0V
Figure 1
V
CC
- V
EE
≥
3.0V
V
CC
-
1.945
V
EE
+
1.2
V
EE
0.095
0.095
-60
V
CC
-
1.625
V
CC
V
CC
-
0.095
V
CC
-
V
EE
3.000
+60
V
CC
-
1.945
V
EE
+
1.2
V
EE
0.095
0.095
-60
V
CC
-
1.625
V
CC
V
CC
-
0.095
V
CC
-
V
EE
3.000
+60
V
CC
-
1.945
V
EE
+
1.2
V
EE
0.095
0.095
-60
V
CC
-
1.625
V
CC
V
CC
-
0.095
V
CC
-
V
EE
3.000
+60
V
V
IHD
V
ILD
V
V
Differential Input
Voltage
Input Current
OUTPUT (Q_,
Q_)
Single-Ended
Output High
Voltage
V
IHD
-
V
ILD
I
IN
V
V
IH,
V
IL,
V
IHD,
V
ILD
µA
V
OH
Figure 2
V
CC
-
1.145
V
CC
-
0.895
V
CC
-
1.145
V
CC
-
0.895
V
CC
-
1.145
V
CC
-
0.895
V
2
_______________________________________________________________________________________
Differential 8:1 ECL/PECL Multiplexer with
Dual Output Buffers
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
- V
EE
= 2.375V to 5.5V, outputs loaded with 50Ω
±1%
to V
CC
- 2V. 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 1–4)
PARAMETER
Single-Ended
Output Low
Voltage
Differential
Output Voltage
SYMBOL
CONDITIONS
-40°C
MIN
V
CC
-
1.945
650
830
TYP
MAX
V
CC
-
1.695
MIN
V
CC
-
1.945
650
840
+25°C
TYP
MAX
V
CC
-
1.695
MIN
V
CC
-
1.945
650
840
+85°C
TYP
MAX
V
CC
-
1.695
UNITS
MAX9389
V
OL
V
OH
-
V
OL
V
BB1
V
BB2
I
EE
Figure 2
V
Figure 2
mV
REFERENCE OUTPUT (V
BB
_ )
Reference
Voltage Output
POWER SUPPLY
Supply Current
(Note 6)
50
70
53
70
55
70
mA
I
BB1
+ I
BB2
=
±0.5mA
(Note 5)
V
CC
-
1.525
V
CC
-
1.425
V
CC
-
1.325
V
CC
-
1.525
V
CC
-
1.425
V
CC
-
1.325
V
CC
-
1.525
V
CC
-
1.425
V
CC
-
1.325
V
AC ELECTRICAL CHARACTERISTICS
(V
CC
- V
EE
= 2.375V to 5.5V, outputs loaded with 50Ω
±1%
to V
CC
- 2V, V
IHD
- V
ILD
= 0.15V to 1V, f
IN
≤
2.5GHz, input duty cycle = 50%,
input transition time = 125ps (20% to 80%). Typical values are at V
CC
- V
EE
= 3.3V, V
IHD
= V
CC
- 1V, V
ILD
= V
CC
- 1.5V, f
IN
= 622 MHz,
input duty cycle = 50%, input transition time = 125ps (20% to 80%.)) (Note 7)
PARAMETER
Differential Input-
to-Output Delay
SEL_-to-Output
Delay
Output-to-Output
Skew
Input-to-Output
Skew
Part-to-Part
Skew
Added Random
Jitter (Note 12)
Added
Deterministic
Jitter (Note 12)
SYMBOL
t
PLHD
,
t
PHLD
t
PLH2
,
t
PHL2
t
SKOO
t
SKIO
t
SKPP
CONDITIONS
Figure 2
Figure 4, input
transition time = 500ps
(20% to 80%) (Note 8)
Figure 5 (Note 9)
Figure 6 (Note 10)
(Note 11)
f
IN
= 156MHz
Clock
f
IN
= 622MHz
pattern
f
IN
= 2.5GHz
PRBS
2
23
- 1
f
IN
= 156Mbps
f
IN
= 622Mbps
0.3
0.3
0.3
33
21
-40°C
MIN
216
TYP
301
MAX
370
MIN
237
+25°C
TYP
310
MAX
416
MIN
255
+85°C
TYP
329
MAX
456
UNITS
ps
1.34
2
1.25
2
1.44
2
ns
15
50
125
1.15
1.15
1.15
95
61
0.3
0.3
0.3
33
21
15
50
150
1.15
1.15
1.15
95
61
0.3
0.3
0.3
33
21
30
55
160
1.15
1.15
1.15
95
ps
ps
ps
t
RJ
ps
RMS
T
DJ
ps
P-P
61
_______________________________________________________________________________________
3
Differential 8:1 ECL/PECL Multiplexer with
Dual Output Buffers
MAX9389
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
- V
EE
= 2.375V to 5.5V, outputs loaded with 50Ω
±1%
to V
CC
- 2V, V
IHD
- V
ILD
= 0.15V to 1V, f
IN
≤
2.5GHz, input duty cycle = 50%,
input transition time = 125ps (20% to 80%). Typical values are at V
CC
- V
EE
= 3.3V, V
IHD
= V
CC
- 1V, V
ILD
= V
CC
- 1.5V, f
IN
= 622 MHz,
input duty cycle = 50%, input transition time = 125ps (20% to 80%.)) (Note 7)
PARAMETER
Switching
Frequency
Select Toggle
Frequency
Output Rise and
Fall Time
(20% to 80%)
SYMBOL
f
MAX
f
SEL
CONDITIONS
V
OH
- V
OL
≥
300mV,
Figure 2
V
OH
- V
OL
≥
300mV,
Figure 4
Figure 2
-40°C
MIN
2.7
100
TYP
MAX
MIN
2.7
100
+25°C
TYP
MAX
MIN
2.7
100
+85°C
TYP
MAX
UNITS
GHz
MHz
t
R
, t
F
67
105
138
74
117
155
81
128
165
ps
Note 1:
Measurements are made with the device in thermal equilibrium.
Note 2:
Current into an I/O pin is defined as positive. Current out of an I/O pin is defined as negative.
Note 3:
DC parameters production tested at T
A
= +25°C and guaranteed by design over the full operating temperature range.
Note 4:
Single-ended data input operation using V
BB
_ is limited to (V
CC
- V
EE
)
≥
3.0V.
Note 5:
Use V
BB_
only for inputs that are on the same device as the V
BB_
reference.
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 from the 50% point of the input signal with the 50% point equal to V
BB
, to the 50% point of the output signal.
Note 9:
Measured between outputs of the same part at the signal crossing points for a same-edge transition.
Note 10:
Measured between input-to-output paths of the same part at the signal crossing points for a same-edge transition of the
differential input signal.
Note 11:
Measured between outputs of different parts at the signal crossing points under identical conditions for a same-edge
transition.
Note 12:
Device jitter added to the differential input signal.
Typical Operating Characteristics
(V
CC
- V
EE
= 3.3V, V
IHD
= V
CC
- 1V, V
ILD
= V
CC
- 1.5V, outputs loaded with 50Ω
±1%
to V
CC
- 2V, f
IN
= 622MHz, input duty cycle = 50%,
input transition time = 125ps (20% to 80%), unless otherwise noted.)
DIFFERENTIAL OUTPUT VOLTAGE (V
OH
- V
OL
)
vs. FREQUENCY
MAX9389 toc01
SUPPLY CURRENT vs. TEMPERATURE
60.0
57.5
SUPPLY CURRENT (mA)
55.0
52.5
50.0
47.5
45.0
42.5
40.0
-40
-15
10
35
60
85
TEMPERATURE (°C)
ALL PINS ARE OPEN EXCEPT V
CC
AND V
EE
DIFFERENTIAL OUTPUT VOLTAGE (mV)
OUTPUT RISE/FALL TIME
vs. TEMPERATURE
MAX9389 toc03
800
700
600
500
400
300
200
0
0.5
1.0
1.5
2.0
2.5
MAX9389 toc02
900
150
140
RISE/FALL TIME (ps)
130
120
110
RISE
100
90
FALL
3.0
-40
-15
10
35
60
85
FREQUENCY (GHz)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Differential 8:1 ECL/PECL Multiplexer with
Dual Output Buffers
Typical Operating Characteristics (continued)
(V
CC
- V
EE
= 3.3V, V
IHD
= V
CC
- 1V, V
ILD
= V
CC
- 1.5V, outputs loaded with 50Ω
±1%
to V
CC
- 2V, f
IN
= 622MHz, input duty cycle = 50%,
input transition time = 125ps (20% to 80%), unless otherwise noted.)
PROPAGATION DELAY vs. HIGH VOLTAGE
OF DIFFERENTIAL INPUT (V
IHD
)
MAX9389 toc04
MAX9389
PROPAGATION DELAY vs. TEMPERATURE
MAX9389 toc05
340
V
IHD
- V
ILD
= 150mV
350
PROPAGATION DELAY (ps)
308
PROPAGATION DELAY (ps)
324
330
t
PHL
310
t
PLH
290
292
276
270
260
1.2
1.5
1.8
2.1
2.4
2.7
3.0
3.3
V
IHD
(V)
250
-40
-15
10
35
60
85
TEMPERATURE (°C)
Pin Description
PIN
1, 8, 22,
26, 29
2
NAME
V
CC
FUNCTION
Positive Supply Input. Bypass each V
CC
to V
EE
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.
Reference Output Voltage 2. Connect to the inverting or noninverting data input to provide a
reference for single-ended operation. When used, bypass V
BB2
to V
CC
with a 0.01µF ceramic
capacitor. Otherwise leave open.
Reference Output Voltage 1. Connect to the inverting or noninverting data input to provide a
reference for single-ended operation. When used, bypass V
BB1
to V
CC
with a 0.01µF ceramic
capacitor. Otherwise leave open.
Noninverting Differential Input 0. Internal 232kΩ to V
CC
and 180kΩ to V
EE
.
Inverting Differential Input 0. Internal 180kΩ to V
CC
and 180kΩ to V
EE
.
Noninverting Differential Input 1. Internal 232kΩ to V
CC
and 180kΩ to V
EE
.
Inverting Differential Input 1. Internal 180kΩ to V
CC
and 180kΩ to V
EE
.
Noninverting Differential Input 2. Internal 232kΩ to V
CC
and 180kΩ to V
EE
.
Inverting Differential Input 2. Internal 180kΩ to V
CC
and 180kΩ to V
EE
.
Noninverting Differential Input 3. Internal 232kΩ to V
CC
and 180kΩ to V
EE
.
Inverting Differential Input 3. Internal 180kΩ to V
CC
and 180kΩ to V
EE
.
Noninverting Differential Input 4. Internal 232kΩ to V
CC
and 180kΩ to V
EE
.
Inverting Differential Input 4. Internal 180kΩ to V
CC
and 180kΩ to V
EE
.
Noninverting Differential Input 5. Internal 232kΩ to V
CC
and 180kΩ to V
EE
.
Inverting Differential Input 5. Internal 180kΩ to V
CC
and 180kΩ to V
EE
.
Negative Supply Input
Noninverting Differential Input 6. Internal 232kΩ to V
CC
and 180kΩ to V
EE
.
Inverting Differential Input 6. Internal 180kΩ to V
CC
and 180kΩ to V
EE
.
V
BB2
3
4
5
6
7
9
10
11
12
13
14
15
16
17, 32
18
19
V
BB1
D0
D0
D1
D1
D2
D2
D3
D3
D4
D4
D5
D5
V
EE
D6
D6
_______________________________________________________________________________________
5
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