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PDF SY89228U Data sheet ( Hoja de datos )
| Número de pieza | SY89228U | |
| Descripción | Clock Divider | |
| Fabricantes | Micrel Semiconductor | |
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SY89228U
1GHz Precision, LVPECL ÷3, ÷5 Clock Divider
with Fail-Safe Input and Internal Termination
General Description
The SY89228U is a precision, low jitter 1GHz ÷3, ÷5
clock divider with an LVPECL output. A unique Fail-
Safe Input (FSI) protection prevents metastable
output conditions when the input clock voltage swing
drops significantly below 100mV or input is removed.
The differential input includes Micrel’s unique, 3-pin
internal termination architecture that allows the input
to interface 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 800mV, 100K-
compatible LVPECL with fast rise/fall times
guaranteed to be less than 270ps.
The SY89228U 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
SY89228U 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.
Block Diagram
Features
Precision Edge®
• Accepts a high-speed input and provides a precision
÷3 and ÷5 sub-rate, LVPECL output
• Fail-Safe Input
– Prevents oscillations when input is invalid
• Guaranteed AC performance over temperature and
supply voltage:
– DC-to >1.0GHz throughput
– < 1500ps Propagation Delay (In-to-Q)
– < 270ps Rise/Fall times
• Ultra-low jitter design:
– <1psRMS random jitter
– <1psRMS cycle-to-cycle jitter
– <10psPP total jitter (clock)
– <0.7psRMS MUX crosstalk induced jitter
• Unique patented internal termination and VT pin
accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
• Wide input voltage range VCC to GND
• 800mV LVPECL output
• 46% to 54% Duty Cycle(÷ 3)
• 47% to 53% Duty Cycle(÷ 5)
• 2.5V ±5% or 3.3V ±10% supply voltage
• -40°C to +85°C industrial temperature range
• Available in 16-pin (3mm x 3mm) MLF® package
Applications
• Fail-safe clock protection
Markets
• LAN/WAN
• Enterprise servers
• ATE
• Test and measurement
Precision Edge is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2007
M9999-080707-A
[email protected] or (408) 955-1690
1 page  
Micrel, Inc.
SY89228U
LVPECL Outputs DC Electrical Characteristics(7)
VCC = 2.5V ±5% or 3.3V ±10%; RL = 50Ω to VCC-2V; TA = –40°C to + 85°C, unless otherwise stated.
Symbol Parameter
Condition
Min Typ Max
VOH Output HIGH Voltage
Q, /Q
VCC-1.145
VCC-0.895
VOL Output LOW Voltage
Q, /Q
VCC-1.945
VCC-1.695
VOUT
Output Voltage Swing
Q, /Q
See Figure 2a.
550 800 950
VDIFF_OUT Differential Output Voltage Swing
Q, /Q
See Figure 2b.
1100
1600
Units
V
V
mV
mV
LVTTL/CMOS DC Electrical Characteristics(7)
VCC = 2.5V ±5% or 3.3V ±10%; TA = –40°C to + 85°C, unless otherwise stated.
Symbol Parameter
Condition
Min Typ Max
VIH Input HIGH Voltage
VIL Input LOW Voltage
IIH Input HIGH Current
IIL Input LOW Current
2.0
-125
-300
0.8
30
Note:
7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
Units
V
V
µA
µA
August 2007
5 M9999-080707-A
[email protected] or (408) 955-1690
5 Page 
Micrel, Inc.
SY89228U
Typical Operating Characteristics
VCC = 3.3V, GND = 0V, VIN = 200mV, tr / tf ≤ 300ps, RL = 50Ω to VCC–2V; TA = 25°C, unless otherwise stated.
August 2007
11 M9999-080707-A
[email protected] or (408) 955-1690
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SY89228U.PDF ] | |
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