Micrel SY58024U User Manual
查询SY58024U供应商
Micrel
ULTRA-LOW JITTER DUAL 2
CROSSPOINT SWITCH w/ CML OUTPUTS
AND INTERNAL I/O TERMINATION
FEATURES
■ Guaranteed AC performance over temperature and
voltage:
• >10.7Gbps data throughput
• <60ps tr/tf times
• <350ps t
(IN-to-Q)
pd
• <20ps skew
■ Low jitter:
• <10pspp total jitter (clock)
• <1ps
random jitter (data)
rms
• <10pspp deterministic jitter (data)
■ Crosstalk induced jitter: <0.7ps
rms
■ Unique, patent-pending input isolation minimizes
adjacent channel crosstalk
■ Accepts an input signal as low as 100mV
■ Unique, patent-pending input termination and VT pin
accepts DC-coupled and AC-coupled differential
inputs: LVPECL, LVDS, and CML
■ Fully differential inputs/outputs
■ 50Ω source terminated CML outputs
■ Power supply 2.5V ±5% and 3.3V ±10%
■ Industrial –40°C to +85°C temperature range
■ Available in 32-pin (5mm
××
× 5mm) MLF™ package
××
APPLICATIONS
××
× 2
××
Precision Edge™
Precision Edge™
SY58024U
SY58024U
Precision Edge™
DESCRIPTION
The SY58024U is a 2.5V/3.3V precision, high-speed, fully
differential dual CML crosspoint switch. The SY58024U is
optimized to provide two identical output copies with less
than 20ps of skew and ultra-low jitter. The SY58024U can
process clock signals as fast as 6GHz or data patterns up
to 10.7Gbps.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows the SY58024U to directly
interface to LVPECL, LVDS, and CML differential signal
(AC- or DC-coupled) without any level-shifting or termination
resistor networks in the signal path. The CML outputs
features a 400mV typical swing into 50Ω loads, and provides
an extremely fast rise/fall time guaranteed to be less than
60ps.
The SY58024U operates from a 2.5V ±5% supply or
3.3V ±10% supply and is guaranteed over the full industrial
temperature range (–40°C to +85°C). For applications that
require high-speed single channel CML switches, consider
the SY58023U. The SY58024U is part of Micrel’s highspeed, Precision Edge™ product line.
Data sheets and support documentation can be found on
Micrel’s website at www.micrel.com.
■ Gigabit Ethernet data/clock routing
■ SONET data/clocking routing
■ Switch fabric clock routing
■ Redundant switchover
■ Backplane redundancy
Precision Edge is a trademark of Micrel, Inc.
Micro
LeadFrame and MLF are trademarks of Amkor Technology, Inc.
M9999-091404
hbwhelp@micrel.com or (408) 955-1690
1
Rev.: B Amendment: /0
Issue Date: September 2004
Micrel
PACKAGE/ORDERING INFORMATION
Precision Edge™
SY58024U
Ordering Information
(1)
Package Operating Package Lead
SELA1
INA1
VTA1
/IN A1
SELA0
32 3130 2928 27 2625
1
INB1
2
VTB1
3
/INB1
INB0
VTB0
/INB0
4
5
6
7
8
9 10111213141516
QB0
VCC
/QB0
VCC
GND
SELB0
SELB1
32-Pin MLF™ (MLF-32)
/INA0
VTA0
QB1
/QB1
INA0
24
23
22
21
20
19
18
17
VCC
GND
VCC
QA0
/QA0
VCC
QA1
/QA1
VCC
Part Number Type Range Marking Finish
SY58024UMI MLF-32 Industrial SY58024U Sn-Pb
SY58024UMITR
(2)
MLF-32 Industrial SY58024U Sn-Pb
SY58024UMY MLF-32 Industrial SY58024U Pb-Free
with “Y” designator
SY58024UMYTR
(2)
MLF-32 Industrial SY58024U Pb-Free
with “Y” designator
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC
electricals only.
2. Tape and Reel.
PIN DESCRIPTION
Pin Number Pin Name Pin Function
25, 27 INA0, /INA0, Differential Signal: Each pin of this pair internally terminates with 50Ω to the VT pin. The
29, 31, INA1, /INA1, input will default to an indeterminate state if left open. See “Input Interface
1, 3, INB1, /INB1 Application” section.
5, 7 INB0, /INB0
26, 30 VTA0, VTA1, Input Termination Center-Tap: Each input terminates to this pin. The VT pin provides a
2, 6 VTB1, VTB0 center-tap for each input (IN, /IN) to a termination network for maximum interface flexibility.
See “Input Interface Application” section.
32, 28, SELA0, SELA1, Select Input: TTL/CMOS select input controls that selects inputs IN0, or IN1, for their
8, 4 SELB1, SELB0 respective banks A and B. Each input is internally connected to a 25kΩ pull-up
resistor and will default to a logic high state if left open.
9,24 GND, Ground. Exposed pad must be connected to a ground plane that is the same potential as the
Exposed Pad device ground pins.
10,13,16, VCC Positive Power Supply: Bypass with 0.1µF0.01µF low ESR capacitors as close to the V
17, 20, 23 pins as possible.
11, 12, /QB0, QB0, CML Differential Output Pairs: Differential buffered output copy of the selected input signal.
14, 15 QB1, /QB1, The CML single-ended output swing is typically 400mV into 50Ω or 100Ω across the pair.
18, 19, /QA1, QA1, Unused output pairs may be left floating with no impact on jitter. See “CML Output
21, 22 /QA0, QA0 Termination” section.
CC
TRUTH TABLE
SELA0 SELA1 QA0 QA1 SELB0 SELB1 QB0 QB1
0 0 INA0 INA0 0 0 INB0 INB0
0 1 INA0 INA1 0 1 INB1 INB1
1 0 INA1 INA0 1 0 INB1 INB0
1 1 INA1 INA1 1 1 INB1 INB1
M9999-091404
hbwhelp@micrel.com or (408) 955-1690
2
Micrel
FUNCTIONAL BLOCK DIAGRAM
Precision Edge™
SY58024U
SY58024U Dual 2 × 2 Crosspoint Switch
SELA0
INA0
V
/INA0
SELA1
INA1
V
/INA1
SELB0
INB0
V
/INB0
TA0
TA1
TB0
50Ω
50Ω
50Ω
50Ω
50Ω
50Ω
Bank A
0
1
0
1
QA0
/QA0
QA1
/QA1
Bank B
0
1
QB0
/QB0
SELB1
INB1
V
/INB1
TB1
50Ω
50Ω
0
1
QB1
/QB1
M9999-091404
hbwhelp@micrel.com or (408) 955-1690
3
Micrel
Precision Edge™
SY58024U
Absolute Maximum Ratings
(1)
Supply Voltage (VCC) .................................. –0.5V to +4.0V
Input Voltage (VIN) ......................................... –0.5V to V
CML Output Voltage (V
OUT
)......... V
–1.0V to V
CC
CC
CC
+0.5V
Current (VT)
Source or Sink Current on VT pin .................. ±100mA
Input Current (VT)
Source or Sink Current on IN, /IN.....................±50mA
Lead Temperature (soldering, 20 sec.) ..................... 260°C
Operating Ratings
Supply Voltage (VCC) ............................ +2.375V to +3.60V
Ambient Temperature (TA).........................–40°C to +85°C
Package Thermal Resistance
MLF™ (θJA)
Still-Air .............................................................35°C/W
500lfpm............................................................28°C/W
MLF™ (ψJB)
Junction-to-board resistance ...........................20°C/W
(2)
(3)
Storage Temperature (TS) ...........................–65°C +150°C
DC ELECTRICAL CHARACTERISTICS
TA = –40°C to +85°C.
Symbol Parameter Condition Min Typ Max Units
V
CC
I
CC
V
IH
V
IL
V
IN
V
DIFF_IN
R
IN
IN to V
T
Power Supply Voltage 2.5V nominal 2.375 2.5 2.625 V
Power Supply Current VCC = max., current through internal 200 250 mA
Input HIGH Voltage IN, /IN; Note 5 VCC–1.6 V
Input LOW Voltage IN, /IN 0 VIH–0.1 V
Input Voltage Swing IN, /IN, see Figure 1a. 0.1 1.7 V
Differential Input Swing IN, /IN, see Figure 1b. 0.2 V
IN-to-VT Resistance 40 50 60 Ω
(4)
3.3V nominal 3.0 3.3 3.60 V
50Ω source termination resistor included.
CC
1.28 V
V
CML OUTPUT DC ELECTRICAL CHARACTERISTICS
(4)
VCC = +3.3V ±10% or +2.5V ±5%; RL = 100Ω across each pair; TA = –40°C to +85°C, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
V
OH
V
OUT
V
DIFF_OUT
R
OUT
Notes:
1. Permanent device damage may occur if “Absolute Maximum Ratings are exceeded.” This is a stress rating only and functional operation is not
implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to “Absolute Maximum Ratlng” 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. Thermal performance assumes exposed pad is soldered (or equivalent) to the device's most negative potential (GND) on the PCB. θJA and ψJB are
characterized for 4-layer boards in still air, unless otherwise stated.
4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
5. VIH(min.) not lower than 1.2V.
M9999-091404
hbwhelp@micrel.com or (408) 955-1690
Output HIGH Voltage Q0, /Q0; Q1, /Q1 VCC–0.020 V
CC
V
Output Voltage Swing Q0, /Q0; Q1, /Q1; see Figure 1a. 325 400 500 mV
Differential Voltage Swing Q0, /Q0; Q1, /Q1; see Figure 1b. 650 800 1000 mV
Output Source Impedance Q0, /Q0; Q1, /Q1 40 50 60 Ω
4
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