The SY89424V is a low-power Phase Locked Loop
(PLL) based frequency synthesizer. The device is capable
of generating up to 1GHz clock frequencies with a low-cost
1025MHz external series-resonant quartz crystal. One
can also use PECL differential clock signals to drive this
device instead of the quartz crystal. Operation of this chip
is controlled by three select pins (S1, S2 and S3). S1
selects the divide ratio of 24 or 50 for the PLL. S2 and S3
select the output frequency. There are two pull-down
resistor pins (PDR
1
and PDR
2
). Each pin has an on-chip
resistor that will control the output driver currents. When
PDR
1
and PDR
2
pins are open, both outputs are normal
open emitter PECL drivers. When PDR
1
and PDR
2
pins
are shorted to the outputs, on-chip pull down currents of
25mA (40mA at 5V V
CC
) are provided. Both output drivers
are capable of driving 20 ohm clock lines. An output enable
(OE) pin is available and it can be HIGH or left open for
normal operation. When OE is LOW, a built-in Disable
Timing Synchronizer will force the FOUT output to LOW at
the completion of the HIGH clock cycle. The FOUT output
remains HIGH during that time.
5V/3.3V
FREQUENCY SYNTHESIZER
(60MHz to 1GHz)
BLOCK DIAGRAM
ClockWorksTM
SY89424V
s
3.3V and 5V power supply options
s
Up to 1GHz clock frequencies
s
Internal quartz reference oscillator driven by quartz
crystal or PECL source
s
Low jitter PLL design
s
On-chip 20 ohm driver
s
Differential outputs with 600mV (min) swing
s
Optional pull-down resistors for AC-coupled outputs
s
Low power consumption
s
External loop filter optimizes performance/cost
s
Available in 16-pin SOIC package
FEATURES
DESCRIPTION
FOUT
FOUT
XTAL1
LOOP
FILTER
S1A
XTAL2
OSC
PHASE
COMP
CHARGE
PUMP
24, 50
VCO
S2A
S3A
1, 2, 3, 4
OE
PDR1 PDR2
F1A F2A
1
Rev.: G
Amendment: /0
Issue Date:
May, 1998
2
ClockWorksTM
SY89424V
Micrel
Input
S1
S2
S3
FOUT, FOUT
Frequency Range MHz
F
OSC
(1)
0
0
0
24X F
OSC
240 480
0
0
1
12X F
OSC
120 240
0
1
0
8X F
OSC
80 160
0
1
1
6X F
OSC
60 120
1
0
0
50X F
OSC
500 1000
1
0
1
25X F
OSC
250 500
1
1
0
16.67X F
OSC
167 333
1
1
1
12.5X F
OSC
125 250
PIN NAMES
Pin
Function
I/O
XTAL
1
Crystal Input 1
(PECL)
I/O
XTAL
2
Crystal Input 2
(PECL)
I/O
F1
Filter Pin 1
--
F2
Filter Pin 2 (Reference)
--
V
CCQ
Positive Power Supply (Charge Pump)
--
S1
Select Input 1
(TTL)
I
S2
Select Input 2
(TTL)
I
S3
Select Input 3
(TTL)
I
FOUT
Output
(PECL)
O
FOUT
Complement Output (PECL)
O
V
CC
Positive Power Supply (Logic)
--
V
CCO
Positive Power Supply (PECL Outputs)
--
OE
Output Enable
(TTL)
I
V
EE
Negative Power Suppy (0.0V)
--
PDR
1
Pulldown Resistor
(100
)
--
PDR
2
Pulldown Resistor
(100
)
--
PIN CONFIGURATION
FREQUENCY SELECTION TABLE
NOTE:
1. F
OSC
= 10MHz to 25MHz.
ABSOLUTE MAXIMUM RATING
(1)
Symbol
Parameter
Value
Unit
V
CC
Power Supply Voltage
0.5 to +7.0
V
V
I
TTL Input Voltage
(2)
0.5 to 6.0
V
I
I
TTL Input Current
(2)
30 to +5.0
mA
I
OUT
ECL Output Current
Continuous
50
mA
Surge
100
T
store
Storage Temperature
65 to +150
C
T
A
Operating Temperature
0 to +75
C
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 RATING conditions
for extended periods may affect device reliability.
2. Either voltage limit or current limit is sufficient to protect input.
V
EE
F1
PDR
1
Top View
Gullwing
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
OE
XTAL
1
XTAL
2
S1
V
CCQ
V
CC
S3
F2
FOUT
FOUT
PDR
2
V
CCO
S2
3
ClockWorksTM
SY89424V
Micrel
Symbol
Parameter
Min.
Typ.
Max.
Unit
Condition
V
O
Output Voltage Swing
0.55
0.85
1.15
V
Peak-to-Peak
V
OH
Output HIGH Voltage
V
CC
1.075
--
V
CC
0.800
V
FOUT & FOUT loaded with 50
to V
CC
2.0V
V
OL
Output LOW Voltage
V
CC
1.860
--
V
CC
1.570
V
FOUT & FOUT loaded with 50
to V
CC
2.0V
V
IH
Input HIGH Voltage
(1)
V
CC
1.165
--
V
CC
0.880
V
V
IL
Input LOW Voltage
(1)
V
CC
1.810
--
V
CC
1.475
V
Symbol
Parameter
Min.
Typ.
Max.
Unit
Condition
V
CC
Power Supply Voltage
4.75
--
5.25
V
V
CC
=
V
CCQ
=
V
CCO
I
CC
Power Supply Current (V
CC
)
--
--
80
mA
I
CCQ
Power Supply Current (V
CCQ
)
--
--
10
mA
I
CCO
Power Supply Current (V
CCO
)
--
--
20
mA
PECL outputs FOUT & FOUT are open
Symbol
Parameter
Min.
Typ.
Max.
Unit
Condition
V
IH
Input HIGH Voltage
2.0
--
--
V
V
IL
Input LOW Voltage
--
--
0.8
V
I
IH
Input HIGH Current
--
--
20
A
V
IN
= 2.7V
100
V
IN
= V
CC
I
IL
Input LOW Current
--
--
0.2
mA
V
IN
= 0.5V
V
IK
Input Clamp Voltage
--
--
1.2
V
I
IN
= 18mA
5V DC ELECTRICAL CHARACTERISTICS
PECL DC ELECTRICAL CHARACTERISTICS
TTL DC ELECTRICAL CHARACTERISTICS
V
CC
= V
CCQ
= V
CCO
= 3.0V to 5.25V
V
CC
= V
CCQ
= V
CCO
= 4.75V to 5.25V
V
CC
= V
CCQ
= V
CCO
= 3.0V to 5.25V
NOTE:
1. Forcing voltage at XTAL
1
and XTAL
2
Symbol
Parameter
Min.
Typ.
Max.
Unit
Condition
V
CC
Power Supply Voltage
3.0
--
3.8
V
V
CC
=
V
CCQ
=
V
CCO
I
CC
Power Supply Current (V
CC
)
--
--
68
mA
I
CCQ
Power Supply Current (V
CCQ
)
--
--
9
mA
I
CCO
Power Supply Current (V
CCO
)
--
--
18
mA
PECL outputs FOUT & FOUT are open
3.3V DC ELECTRICAL CHARACTERISTICS
V
CC
= V
CCQ
= V
CCO
= 3.0V to 5.25V
5
ClockWorksTM
SY89424V
Micrel
16 LEAD SOIC .300" WIDE (Z16-1)
Rev. 03
MICREL-SYNERGY
3250 SCOTT BOULEVARD
SANTA CLARA
CA 95054
USA
TEL
+ 1 (408) 980-9191
FAX
+ 1 (408) 914-7878
WEB
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
2000 Micrel Incorporated
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