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PDF SY89827L Data sheet ( Hoja de datos )
| Número de pieza | SY89827L | |
| Descripción | DUAL 1:10 HSTL FANOUT BUFFER/TRANSLATOR | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Micrel, Inc.
Precision Edge®
3.3V 500MHz DUAL 1:10 HSTL FANOUT Precision ESdYg89e8®27L
BUFFER/TRANSLATOR WITH 2:1 MUX INPUT SY89827L
FEATURES
s Dual LVPECL or HSTL input, 10 differential 1.5V
HSTL compatible outputs
Precision Edge®
s Configurable as dual-channel 10 output or a single-
channel 20 output clock driver
DESCRIPTION
s Guaranteed AC parameters over temperature and
voltage:
The SY89827L is a High Performance Bus Clock Driver
• > 500MHz fMAX
• < 50ps within device skew
with dual 1:10 or single 1:20 HSTL (High Speed
Transceiver Logic) output pairs. The part is designed for
• < 1.5ns propagation delay
use in low voltage (3.3V/1.8V) applications which require
• < 700ps tr / tf time
s Low jitter design
• < 1psRMS cycle-to-cycle jitter
• < 10psPP total jitter
s 3.3V core supply, 1.8V output supply
s Output enable function
s Available in a 64-Pin EPAD-TQFP
a large number of outputs to drive precisely aligned, ultra
low skew signals to their destination. The input is
multiplexed from either HSTL or LVPECL (Low Voltage
Positive Emitter Coupled Logic) by the CLK_SEL pin.
The Output Enables (OE1 & OE2) are synchronous so
that the outputs will only be enabled/disabled when they
are already in the LOW state. This avoids any chance of
generating a runt clock pulse when the device is enabled/
disabled as can happen with an asynchronous control.
APPLICATIONS
The SY89827L features extremely low skew
performance of <50ps over temperature and voltage –
s High-performance PCs
s Workstations
performance previously unachievable in a standard
productwww.DataSheet4U.com having such a high number of outputs. The
SY89827L is available in a single space saving package,
s Parallel processor-based systems
s Other high-performance computing
s Communications
enabling a lower overall cost solution. For applications
that require greater HSTL fanout capability, consider the
SY89824L.
TYPICAL APPLICATION CIRCUIT
Primary Clock Source
LVPECL_CLKA
/LVPECL_CLKA
Redundant Backup
Clock Source
LVPECL_CLKB
/LVPECL_CLKB
10
Primary
10 Card
10
Redundant
10 Card
SEL1
Primary/Backup Clock Select
(Switchover within 2.0ns)
System using SY89827L as a switchover circuit from a Primary Clock to a Redundant Backup Clock in a failsafe application.
LVPECL inputs only, shown in this application.
Precision Edge is a registered trademark of Micrel, Inc.
M9999-011907
[email protected] or (408) 955-1690
1
Rev.: E Amendment: /0
Issue Date: January 2007
1 page  
Micrel, Inc.
Precision Edge®
SY89827L
Absolute Maximum Ratings(Note 1)
Power Supply Voltage (VCCI, VCCO) .............. –0.5 to +4.0V
Input Voltage (VIN) ........................................... –0.5 to VCCI
Output Current (IOUT) ............................................... –50mA
Lead Temperature (TLEAD, Soldering, 20sec.) .......... 260°C
Storage Temperature (TS) ........................... –65 to +150°C
ESD Rating, Note 3 .................................................... >1kV
Operating Ratings(Note 2)
Supply Voltage
(VCCI) .................................................... +3.3V to +3.47V
(VCCO) ..................................................... +1.6V to +2.0V
Ambient Temperature (TA) ......................... –40°C to +85°C
Package Thermal Resistance
TQFP (θJA)
Exposed pad soldered to GND, Note 4
Still-Air (multi-layer PCB) ................................. 23°C/W
–200lfpm (multi-layer PCB) ............................. 18°C/W
–500lfpm (multi-layer PCB) ............................. 15°C/W
Exposed pad NOT soldered to GND (not recommended)
Still-Air (multi-layer PCB) ................................. 44°C/W
–200lfpm (multi-layer PCB) ............................. 36°C/W
–500lfpm (multi-layer PCB) ............................. 30°C/W
TQFP (θJC) ......................................................... 4.4°C/W
DC ELECTRICAL CHARACTERISTICS
Power Supply: TA = –40°C to +85°C
Symbol
Parameter
Condition
VCCI
VCCO
ICCI
VCC Core
VCC Output
ICC Core
No Load
Min Typ Max Units
3.13 3.3 3.47
V
1.6 1.8 2.0
V
140 170 mA
HSTL Input/Output: VCCI = 3.3V ±5%, VCCO = 1.8V ±10%, TA = –40°C to +85°C
Symbol
Parameter
Condition
Min Typ Max Units
VOH Output HIGH Voltage
VOL Output LOW Voltage
VIH Input HIGH Voltage
VIL Input LOW Voltage
VX Input Crossover Voltage
IIH Input HIGH Current
IIL Input LOW Current
Note 5
Note 5
1.0
0.2
VX +0.1
–0.3
0.68
+20
1.2
0.4
1.6
VX –0.1
0.9
–350
–500
V
V
V
V
V
µA
µA
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
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.
The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
Devices are ESD sensitive. Handling precautions recommended.
It is highly recommended to solder the exposed pad of the EPAD-TQFP package to a ground plane on the PCB for maximum thermal
efficiency.
Outputs loaded with 50Ω-to-ground.
M9999-011907
[email protected] or (408) 955-1690
5
5 Page 
Micrel, Inc.
64-PIN EPAD-TQFP (DIE UP) (H64-1)
+0.05
–0.05
+0.012
–0.012
+0.05
–0.05
+0.002
–0.002
+0.03
–0.03
+0.012
–0.012
Precision Edge®
SY89827L
+0.15
–0.15
+0.006
–0.006
+0.05
–0.05
+0.002
–0.002
Package
EP- Exposed Pad
Die
Rev. 02
CompSide Island
Heat Dissipation
Heat Dissipation
Heavy Copper Plane
Heavy Copper Plane
VEE
VEE
PCB Thermal Consideration for 64-Pin EPAD-TQFP Package
(Always solder, or equivalent, the exposed pad to the PCB)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2006 Micrel, Incorporated.
M9999-011907
[email protected] or (408) 955-1690
11
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| PDF Descargar | [ Datasheet SY89827L.PDF ] | |
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