1
Precision Edge
SY58038U
Micrel, Inc.
M9999-051305
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
s
Selects between 1 of 8 inputs, and provides 2
precision, low skew LVPECL output copies
s
Guaranteed AC performance over temperature and
voltage:
DC to 4.5Gbps throughput
<500ps propagation delay IN-to-Q (V
IN
100mV)
<100ps 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)
<1ps
RMS
cycle-to-cycle jitter
<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
800mV LVPECL output swing
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 LVPECL FANOUT BUFFER
Precision Edge
SY58038U
APPLICATIONS
s Data communication systems
s
All SONET/SDH data/clock applications
s
All Fibre Channel applications
s
All Gigabit Ethernet applications
Rev.: B
Amendment: /0
Issue Date:
May 2005
The SY58038U 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 SY58038U distributes clock frequencies
from DC to 3.5GHz, and data rates to 4.5Gpbs guaranteed
over temperature and voltage.
The SY58038U 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 without any level shifting or termination resistor
networks in the signal path. The outputs are 800mV, 100K
compatible LVPECL with extremely fast rise/fall times
guaranteed to be less than 100ps.
The SY58038U features a patent-pending isolation design
that significantly improves channel-to-channel crosstalk
performance.
The SY58038U 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 SY58038U is part of Micrel's
high-speed, Precision Edge
product line.
Data sheets and support documentation can be found on
Micrel's web site at www.micrel.com.
Precision Edge is a registered trademark of Micrel, Inc.
MLF and
MicroLeadFrame are trademarks of Amkor Technology, Inc.
Precision Edge
2
Precision Edge
SY58038U
Micrel, Inc.
M9999-051305
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 Edge
SY58038U
Micrel, Inc.
PACKAGE/ORDERING INFORMATION
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. For a CML or LVDS inputs, the VT
41, 37
VT6, VT7
pin is left floating.
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 single-ended TTL/CMOS-compatible inputs select the inputs to the multiplexer. Note that
22,
SEL1,
this input is internally connected to a 25k
pull-up resistor and will default to a logic HIGH state
35
SEL2
if left open.
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 LVPECL output pairs are the outputs of the device. Unused output
30, 31
Q1,/Q1
pairs may be left open. Each output is designed to drive 800mV into 50
terminated to V
CC
2V.
(or V
CC
1.2V if AC-coupled).
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-AC3
IN7
VT7
9
10
11
25
24
23
20 21 22
35
IN3
VREF-AC1
/IN2
Q0
VCC
GND
36
34
NC
SEL2
/IN7
IN1
VT1
/IN1
IN2
VT2
VREF-AC0
/IN0
VT0
SEL2
SEL1
IN0
44-Pin MLFTM (MLF-44)
Ordering Information
(1)
Package Operating
Package
Lead
Part Number
Type
Range
Marking
Finish
SY58038UMI
MLF-44
Industrial
SY58038U
Sn-Pb
SY58038UMITR
(2)
MLF-44
Industrial
SY58038U
Sn-Pb
SY58038UMG
(3)
MLF-44
Industrial
SY58038U with
Pb-Free
Pb-Free bar-line indicator
NiPdAu
SY58038UMGTR
(2, 3)
MLF-44
Industrial
SY58038U with
Pb-Free
Pb-Free bar-line indicator
NiPdAu
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25
C, DC electricals only.
2. Tape and Reel.
3. Pb-Free package recommended for new designs.
4
Precision Edge
SY58038U
Micrel, Inc.
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, 20 sec.) ..................... 260
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
.
120
170
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
(IN-to-/IN)
0
V
IH
0.1
V
V
IN
Input Voltage Swing
(IN-to-/IN)
See Figure 1a.
0.1
1.7
V
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 Edge
SY58038U
Micrel, Inc.
V
CC
= 2.5V
5% or 3.3V
10%; T
A
= 40
C to +85
C; R
L
= 50
to V
CC
2V, unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
OH
Output HIGH Voltage
V
CC
1.145
V
CC
0.895
V
Q, /Q
V
OL
Output LOW Voltage
V
CC
1.945
V
CC
1.695
V
Q, /Q
V
OUT
Output Differential Swing
See Figure 1a.
550
800
mV
Q, /Q
V
DIFF_OUT
Differential Output Voltage Swing
See Figure 1b.
1100
1600
mV
Q, /Q
LVPECL 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)
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