1
Precision EdgeTM
SY58037U
Micrel
M9999-070804
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
s
Selects between 1 of 8 inputs, and provides two
precision, low skew CML output copies
s
Guaranteed AC performance over temperature and
voltage:
DC to 5Gbps throughput
<450ps propagation delay IN-to-Q (V
IN
300mV)
<70ps t
r
/ t
f
time
<15ps skew (output-to-output)
s
Unique, patent-pending, channel-to-channel
isolation design provides superior crosstalk
performance
s
Ultra-low jitter design:
<1ps
rms
random jitter
<10ps
pp
deterministic jitter
<10ps
pp
total jitter (clock)
<0.7ps
rms
crosstalk-induced jitter
s
Unique, patent-pending, input termination and VT
pin accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
s
400mV CML output swing
s
50
source terminated outputs minimize round-trip
reflections
s
Power supply 2.5V
5% or 3.3V
10%
s
40
C to +85
C temperature range
s
Available in 44-pin (7mm
7mm) MLFTM package
FEATURES
ULTRA PRECISION 8:1 MUX
WITH INTERNAL TERMINATION AND
1:2 CML FANOUT BUFFER
Precision EdgeTM
SY58037U
APPLICATIONS
s Data communication systems
s
All SONET/SDH data/clock applications
s
All Fibre Channel applications
s
All Gigabit Ethernet applications
Rev.: A
Amendment: /0
Issue Date:
July 2004
The SY58037U is a low jitter, low skew, high-speed 8:1
multiplexer with a 1:2 differential fanout buffer optimized for
precision telecom and enterprise server distribution
applications. The SY58037U distributes clock frequencies
from DC to 4GHz and data rates to 5Gpbs guaranteed over
temperature and voltage.
The SY58037U differential input includes Micrel's unique,
3-pin input termination architecture that directly interfaces
to any differential signal (AC- or DC-coupled) as small as
100mV (200mVpp) without any level shifting or termination
resistor networks in the signal path. The outputs are 50
source-terminated CML with extremely fast rise/fall time
guaranteed to be less than 70ps.
The SY58037U features a patent-pending isolation design
that significantly improves channel-to-channel crosstalk
performance.
The SY58037U operates from a 2.5V
5% or 3.3V
10%
supply and is guaranteed over the full industrial temperature
range of 40
C to +85
C. The SY58037U is part of Micrel's
high-speed, Precision EdgeTM product line.
Data sheets and support documentation can be found on
Micrel's web site at www.micrel.com.
Precision Edge is a trademark of Micrel, Inc.
MLF and
Micro
LeadFrame are trademarks of Amkor Technology, Inc.
Precision EdgeTM
2
Precision EdgeTM
SY58037U
Micrel
M9999-070804
hbwhelp@micrel.com or (408) 955-1690
FUNCTIONAL BLOCK DIAGRAM
Q0
/Q0
Q1
/Q1
0
MUX
SEL0 (CMOS/TTL)
S2
8:1 MUX
1:2 Fanout
IN0
/IN0
VT0
50
50
VREF-AC0
S1
S0
1
2
3
4
5
6
7
IN1
/IN1
VT1
50
50
IN2
/IN2
VT2
50
50
VREF-AC1
IN3
/IN3
VT3
50
50
IN4
/IN4
VT4
50
50
VREF-AC2
IN5
/IN5
VT5
50
50
IN6
/IN6
VT6
50
50
VREF-AC3
IN7
/IN7
VT7
50
50
SEL1 (CMOS/TTL)
SEL3 (CMOS/TTL)
TRUTH TABLE
SEL2
SEL1
SEL0
Q
/Q
L
L
L
IN0
/IN0
L
L
H
IN1
/IN1
L
H
L
IN2
/IN2
L
H
H
IN3
/IN3
H
L
L
IN4
/IN4
H
L
H
IN5
/IN5
H
H
L
IN6
/IN6
H
H
H
IN7
/IN7
3
Precision EdgeTM
SY58037U
Micrel
PACKAGE/ORDERING INFORMATION
Ordering Information
(1)
Package
Operating
Package
Lead
Part Number
Type
Range
Marking
Finish
SY58037UMI
MLF-44
Industrial
SY58037U
Tn-Pb
SY58037UMITR
(2)
MLF-44
Industrial
SY58037U
Tn-Pb
SY58037UMI
MLF-44
Industrial
SY58037U
Pb-Free
and white dot
or bar
SY58037UMITR
(2)
MLF-44
Industrial
SY58037U
Pb-Free
and white dot
or bar
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25
C, DC
electricals only.
2. Tape and Reel.
Pin Number
Pin Name
Pin Function
20, 18,
IN0, /IN0,
Differential Inputs: These input pairs are the differential signal inputs to the device. Inputs accept
16, 14,
IN1, /IN1,
AC or DC-coupled signals as small as 100mV. Each pin of a pair internally terminates to a VT
13, 11,
IN2, /IN2,
pin through 50
. Note that these inputs will default to an indeterminate state if left open.
9, 7,
IN3, /IN3,
Please refer to the "Input Interface Applications" section for more details.
5, 3,
IN4, /IN4,
1, 43,
IN5,/IN5,
42, 40,
IN6, /IN6,
38, 36
IN7, /IN7
19,15,
VT0, VT1
Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin.
12, 8,
VT2, VT3,
The VT pins provide a center-tap to a termination network for maximum interface flexibility.
4, 44,
VT4, VT5,
See "Input Interface Applications" section for more details.
41, 37
VT6, VT7
17,
VREF-AC0,
Reference Voltage: This output biases to V
CC
1.2V. It is used when AC coupling the inputs
10,
VREF-AC1,
(IN, /IN). For AC-coupled applications, connect VREF_AC to the VT pin and bypass with a
2
VREF-AC2,
0.01
F low ESR capacitor to V
CC
. See "Input Interface Applications" section for more details.
39
VREF-AC3
21,
SEL0,
The TTL/CMOS-compatible inputs select the inputs to the multiplexer. Note that this input is
22,
SEL1,
internally connected to a 25k
pull-up resistor and will default to a logic HIGH state if left open.
35
SEL2
24, 27, 29, 32
VCC
Positive Power Supply. Bypass with 0.1
F
0.01
F low ESR capacitors as close to each VCC
pin.
25, 26,
Q0,/Q0,
Differential Outputs: These CML output pairs are the outputs of the device. Please refer to
30, 31
Q1,/Q1
the truth table below for details. Unused output pairs may be left open. Each output is designed
to drive 400mV into 100
across each output pair.
23, 28, 33
GND,
Ground. GND and exposed pad must both be connected to the most negative potential of chip
Exposed Pad
ground.
PIN DESCRIPTION
1
2
3
4
5
6
7
8
33
32
31
30
29
28
27
26
12 13 14 15 16 17 18 19
44 43 42 41 40 39 38 37
IN5
VREF-AC2
/IN4
VT4
IN4
NC
/IN3
VT3
GND
VCC
/Q1
Q1
VCC
GND
VCC
/Q0
/IN6
VT6
IN6
/IN5
VT5
VREF-A
C3
IN7
VT7
IN1
VT1
/IN1
IN2
VT2
VREF-A
C0
/IN0
VT0
9
10
11
25
24
23
20 21 22
35
IN3
VREF-AC1
/IN2
SEL1
SEL0
IN0
Q0
VCC
GND
36
34
NC
SEL2
/IN7
44-Pin MLFTM (MLF-44)
4
Precision EdgeTM
SY58037U
Micrel
Absolute Maximum Ratings
(1)
Power Supply Voltage (V
CC
) ...................... 0.5V to +4.0V
Input Voltage (V
IN
) ......................................... 0.5V to V
CC
LVPECL Output Current (I
OUT
)
Continuous ............................................................. 50mA
Surge .................................................................... 100mA
Termination Current
(3)
Source or sink current on VT pin ........................
100mA
Lead Temperature (soldering, 10 sec.) ..................... 265
C
Storage Temperature Range (T
S
) ........... 65
C to +150
C
Operating Ratings
(2)
Power Supply Voltage (V
CC
) ............... +2.375V to +2.625V
............................................................ +3.0V to +3.6V
Ambient Temperature Range (T
A
) ............. 40
C to +85
C
Package Thermal Resistance
(4)
MLFTM (
JA
)
Still-Air ............................................................. 24
C/W
MLFTM (
JB
)
Junction-to-board ............................................ 12
C/W
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
CC
Power Supply Voltage
V
CC
= 2.5V.
2.375
2.5
2.625
V
V
CC
= 3.3V.
3.0
3.3
3.6
V
I
CC
Power Supply Current
No load, max. V
CC
.
145
200
mA
R
IN
Input Resistance (IN-to-V
T
)
40
50
60
R
DIFF_IN
Differential Input Resistance
80
100
120
(IN-to-/IN)
V
IH
Input HIGH Voltage
Note 6
V
CC
1.6
V
CC
V
(IN-to-/IN)
V
IL
Input LOW Voltage
0
V
IH
0.1
V
(IN-to-/IN)
V
IN
Input Voltage Swing
See Figure 1a.
0.1
1.7
V
(IN-to-/IN)
V
DIFF_IN
Differential Input Voltage Swing
See Figure 1b.
0.2
V
(IN-to-/IN)
V
T_IN
IN to V
T
(IN-to-/IN)
1.28
V
V
REF-AC
Output Reference Voltage
V
CC
1.3 V
CC
1.2 V
CC
1.1
V
Notes:
1. Permanent device damage may occur if ratings in the "Absolute Maximum Ratings" section are exceeded. This is a stress rating only and functional
operation is not implied for conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratings
conditions for extended periods may affect device reliability.
2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
3. Due to the limited drive capability, use for input of the same package only.
4. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB.
JB
uses 4-layer
JA
in still-air number unless otherwise stated.
5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
6. V
IH
(min), not lower than 1.2V.
DC ELECTRICAL CHARACTERISTICS
(5)
T
A
= 40
C to +85
C, unless otherwise stated.
5
Precision EdgeTM
SY58037U
Micrel
V
CC
= 2.5V
5% or 3.3V
10%; T
A
= 40
C to +85
C; R
L
= 100
across each output pair, unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
OH
Output HIGH Voltage
V
CC
0.040 V
CC
0.010
V
CC
V
Q, /Q
V
OUT
Output Differential Swing
See Figure 1a.
325
400
mV
Q, /Q
V
DIFF_OUT
Differential Output Voltage Swing
See Figure 1b.
650
800
mV
Q, /Q
R
OUT
Output Source Impedance
40
50
60
CML OUTPUT DC ELECTRICAL CHARACTERISTICS
(7)
V
CC
= 2.5V
5% or 3.3V
10%; T
A
= 40
C to +85
C, unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
IH
Input HIGH Voltage
2.0
V
CC
V
V
IL
Input LOW Voltage
0.8
V
I
IH
Input HIGH Current
125
30
A
I
IL
Input LOW Current
300
A
Note:
7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS
(7)
PDF 
ZIP