Microchip SY58028U Bedienungsanleitung
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SY58028U
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Precision Edge
®
SY58028U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
■ Selects 1 of 4 differential inputs
■ Provides two copies of the selected input
■ Guaranteed AC performance over temperature and
voltage:
• DC-to- > 10.7Gbps data rate throughput
•<350ps IN-to-Out t
pd
•<60ps t
r
/t
f
times
■ Ultra low-jitter design:
•<10ps
PP
total jitter (clock)
•<1ps
RMS
random jitter
•<10ps
PP
deterministic jitter
•< 0.7ps
RMS
crosstalk-induced jitter
■ Unique patended input design minimizes crosstalk
■ Accepts an input signal as low as 100mV
■ Unique patended input termination and V
T
pin
accepts DC- and AC-coupled inputs (CML, LVPECL,
LVDS)
■ Internal 50Ω output source termination
■ 400mV CML output swing (R
L
= 50Ω)
■ Power supply 2.5V ±5% or 3.3V ±10%
■ –40°C to +85°C temperature range
■ Available in 32-pin (5mm
××
××
× 5mm) MLF
®
package
FEATURES
ULTRA PRECISION DIFFERENTIAL
CML 4:1 MUX WITH 1:2 FANOUT
AND INTERNAL I/O TERMINATION
Precision Edge
®
SY58028U
APPLICATIONS
■ Redundant clock and/or data distribution
■ All SONET/SDH clock/data distribution
■ Loopback
■ All Fibre Channel distribution
■ All Gigabit Ethernet clock and/or data distribution
Rev.: D Amendment: /0
Issue Date: August 2007
The SY58028U is a 2.5V/3.3V precision, high-speed, 4:1
differential CML multiplexer capable of handling clocks up
to 7GHz and data streams up to 10.7Gbps. In addition, a
1:2 fanout buffer provides two copies of the selected inputs.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows customers to interface 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 result is a clean, stub-free, low-jitter
interface solution. The outputs are 50Ω source terminated
CML, with extremely fast rise/fall times guaranteed to be less
than 60ps.
The SY58028U operates from a 2.5V ±5% supply or a
3.3V ±10% supply and is guaranteed over the full industrial
temperature range of –40°C to +85°C. For applications that
require LVPECL outputs, consider the SY58029U or
SY58030U Multiplexers. The SY58028U is part of Micrel’s
high-speed, Precision Edge
®
product line.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
TYPICAL PERFORMANCE
Precision Edge is a registered trademark of Micrel, Inc.
Micro
LeadFrame and MLF are registered trademarks of Amkor Technology, Inc.
Precision Edge
®
FUNCTIONAL BLOCK DIAGRAM
IN0
/IN0
V
T0
50Ω
50Ω
IN1
/IN1
V
T1
50Ω
50Ω
Q0
/Q0
0
1
MUX
4:1
MUX
1:2
Fanout
V
REF-AC0
IN2
/IN2
V
T2
50Ω
50Ω
V
REF-AC2
V
REF-AC1
2
IN3
/IN3
V
T3
50Ω
50Ω
V
REF-AC3
3
SEL0 (CMOS/TTL)
SEL1 (CMOS/TTL)
Q1
/Q1
TIME (100ps/div.)
Output Swing
(100mV/div.)
2
Precision Edge
®
SY58028U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
PACKAGE/ORDERING INFORMATION
Pin Number Pin Name Pin Function
1, 4 IN0, /IN0 Differential Inputs: These inputs accept AC- or DC-coupled signals as small as 100mV.
5, 8 IN1, /IN1 Each pin of a pair internally terminates to a V
T
pin through 50Ω. Note that these
25, 28 IN2, /IN2 inputs will default to an indeterminate state if left open. If an input pair is not used, connect
29, 32 IN3, /IN3 one input of the pair to ground through a 1kΩ resistor and the complement to V
CC
through a
825Ω resistor. Unused V
T
and V
REF-AC
may also be left open. Please refer to the “Input
Interface Applications” section for more details.
2, 6, 26, 30 VT0, VT1 Input Termination Center-Tap: Each side of the differential input pair terminates to a V
T
VT2, VT3 pin. The V
T
pin provides a center-tap to the termination network for maximum
interface flexibility. See “Input Interface Applications” section for more details.
15, 18 SEL0, SEL1 This single-ended TTL/CMOS compatible input selects the inputs to the multiplexer. Note
that this input is internally connected to a 25kΩ pull-up resistor and will default to a logic
HIGH state if left open. Input logic threshold is V
CC
/2. See “Truth Table” for select control.
14, 19 NC No Connect.
10, 13, 16 VCC Positive Power Supply: Bypass with 0.1µF0.01µF low ESR capacitors.
17, 20, 23
11, 12 /Q0, Q0 Differential Outputs: These CML output pairs are copies of the selected input. Unused
21, 22 /Q1, Q1 output pairs may be left floating. See “Output Interface” section for termination guidelines.
9, 24 GND, Ground. Ground pin and exposed pad must be connected to the same ground plane.
Exposed Pad
3, 7, 27, 31 VREF-AC0 Reference Voltage: This reference output is equivalent to V
CC
–1.4V. It is used for AC-coupled
VREF-AC1 inputs. When interfacing to AC input signals, connect V
REF-AC
directly to the V
T
pin and
VREF-AC2 bypass with 0.01µF low ESR capacitor to V
CC
. See “Input Interface Applications” section.
VREF-AC3 Maximum sink/source current is 0.5mA.
PIN DESCRIPTION
24
23
22
21
20
19
18
17
GND
VCC
Q1
/Q1
VCC
NC
SEL1
VCC
IN0
VT0
VREF-AC0
/IN0
IN1
VT1
VREF-AC1
/IN1
1
2
3
4
5
6
7
8
910111213141516
32 31 30 29 28 27 26 25
/IN2
IN3
VT3
VREF-AC3
/IN3
VREF-AC2
VT2
IN2
VCC
Q0
/Q0
VCC
GND
NC
SEL0
VCC
32-Pin MLF
®
(MLF-32)
TRUTH TABLE
SEL1 SEL0
00IN0 Input Selected
01IN1 Input Selected
10IN2 Input Selected
11IN3 Input Selected
Ordering Information
(1)
Package Operating Package Lead
Part Number Type Range Marking Finish
SY58028UMI MLF-32 Industrial SY58028U Sn-Pb
SY58028UMITR
(2)
MLF-32 Industrial SY58028U Sn-Pb
SY58028UMG
(3)
MLF-32 Industrial SY58028U with Pb-Free
Pb-Free bar-line indicator NiPdAu
SY58028UMGTR
(2, 3)
MLF-32 Industrial SY58028Uwith 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.
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | SY58028U |
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