Dual phase-locked loop (PLL) device with three out-
put clock frequencies
On-chip crystal oscillator for reference frequency
generation
3.3V or 5V supply voltage available
Small circuit board footprint (16-pin 0.150″ SOIC)
Custom frequency selections available - contact your
local AMI Sales Representative for more information
The FS6244 is a monolithic CMOS clock generator IC
designed to minimize cost and component count in digital
video/audio systems.
Two high-resolution phase-locked loops generate three
output clocks through an array of post-dividers. All fre-
quencies are ratiometrically derived from the crystal os-
cillator frequency. The locking of all the output frequen-
cies together can eliminate unpredictable artifacts in
video systems and reduce electromagnetic interference
(EMI) due to frequency harmonic stacking.
Figure 1: Pin Configuration
n/c
XOUT
XIN
VDD
VSS
CLKA
n/c
n/c
1
2
3
16
15
14
Table 1: Version Information
n/c
n/c
CLKB
VDD
n/c
VSS
CLKC
n/c
NOTE: Contact AMI for custom versions
DEVICE
FS6244-03
VDD
(nom)
5
F
XIN
(MHz)
27.000
CLKA
(MHz)
11.2896
(+1.1 ppm)
CLKB
(MHz)
3.6864
CLKC
(MHz)
27.000
FS6244
4
5
6
7
8
13
12
11
10
9
16-pin (0.150″) SOIC
Figure 2: Block Diagram
XIN
CRYSTAL
OSC.
XOUT
DIVIDER
ARRAY
CLKB
PLL
CLKA
PLL
CLKC
FS6244
American Microsystems, Inc. reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.
2.28.02
ISO9001
FS6244
Dual PLL Clock Generator IC
Table 2: Pin Descriptions
Key: AI = Analog Input; AO = Analog Output; DI = Digital Input; DI
U
= Input with Internal Pull-Up; DI
D
= Input with Internal Pull-Down; DIO = Digital Input/Output; DI-3 = Three-Level Digital Input,
DO = Digital Output; P = Power/Ground; # = Active Low pin
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TYPE
-
AO
AI
P
P
DO
-
-
-
DO
P
-
P
DO
-
-
NAME
N/C
XOUT
XIN
VDD
VSS
CLKA
N/C
N/C
N/C
CLKC
VSS
N/C
VDD
CLKB
N/C
N/C
No Connection
Crystal Oscillator Drive
Crystal Oscillator Feedback
Power Supply (+3.3V or +5V)
Ground
Clock Output A
No Connection
No Connection
No Connection
Clock Output C
Ground
No Connection
Power Supply (+3.3V or +5V)
Clock Output B
No Connection
No Connection
DESCRIPTION
3.0
3.1
Functional Block Description
Phase-Locked Loop (PLL)
3.2
Crystal Oscillator
The on-chip PLLs are a standard frequency- and phase-
locked loop architecture. The PLL multiplies the reference
oscillator to the desired frequency by a ratio of integers.
The frequency multiplication is exact with a zero synthe-
sis error unless otherwise indicated in the frequency ta-
ble.
The Crystal Oscillator provides a stable, low-jitter fre-
quency reference for the rest of the FS6244 system com-
ponents. Loading capacitance for the crystal is internal to
the FS6244. No external components (other than the
resonator itself) are required for operation of the crystal
oscillator.
2
ISO9001
2.28.02
FS6244
Dual VCXO Clock Generator IC
4.0
Electrical Specifications
Table 3: Absolute Maximum Ratings
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These conditions represent a stress rating only, and functional operation of the device at
these or any other conditions above the operational limits noted in this specification is not implied. Exposure to maximum rating conditions for extended conditions may affect device performance,
functionality, and reliability.
PARAMETER
Supply Voltage (V
SS
= ground)
Input Voltage, dc
Output Voltage, dc
Input Clamp Current, dc (V
I
< 0 or V
I
> V
DD
)
Output Clamp Current, dc (V
I
< 0 or V
I
> V
DD
)
Storage Temperature Range (non-condensing)
Ambient Temperature Range, Under Bias
Junction Temperature
Lead Temperature (soldering, 10s)
Input Static Discharge Voltage Protection (MIL-STD 883E, Method 3015.7)
SYMBOL
V
DD
V
I
V
O
I
IK
I
OK
T
S
T
A
T
J
MIN.
V
SS
-0.5
V
SS
-0.5
V
SS
-0.5
-50
-50
-65
-55
MAX.
7
V
DD
+0.5
V
DD
+0.5
50
50
150
125
125
260
2
UNITS
V
V
V
mA
mA
°C
°C
°C
°C
kV
CAUTION: ELECTROSTATIC SENSITIVE DEVICE
Permanent damage resulting in a loss of functionality or performance may occur if this device is subjected to a high-energy elec-
trostatic discharge.
Table 4: Operating Conditions
PARAMETER
Supply Voltage (3.3 volt system)
Supply Voltage (5.0 volt system)
Ambient Operating Temperature Range
Crystal Resonator Frequency
SYMBOL
V
DD
V
DD
T
A
f
XTAL
CONDITIONS/DESCRIPTION
SEE NOTE 1
SEE NOTE 1
SEE NOTE 1
Fundamental Mode
MIN.
3.0
4.5
0
5
TYP.
3.3
5.0
MAX.
3.6
5.5
70
27
UNITS
V
V
°C
MHz
NOTE 1: These specifications represent generic FS6244 device capability. Device specifications for a particular version (i.e. FS6244-xx) are guaranteed only with the operating voltage and refer-
ence frequency specified in Version Information.
3
ISO9001
2.28.02
FS6244
Dual PLL Clock Generator IC
Table 5: DC Electrical Specifications (V
DD
= 3.3V nominal)
Unless otherwise stated, V
DD
= 3.3V ± 10%, no load on any output, and ambient temperature range T
A
= 0°C to 70°C. Parameters denoted with an asterisk ( * ) represent nominal characterization
data and are not production tested to any specific limits. Where given, MIN and MAX characterization data are
±
3σ from typical. Negative currents indicate current flows out of the device.
PARAMETER
Overall
Supply Current, Dynamic, with Loaded
Outputs
Crystal Oscillator
Crystal Loading Capacitance
Crystal Drive Level
Crystal Oscillator Feedback (XIN)
Threshold Bias Voltage
High-Level Input Current
Low-Level Input Current
Crystal Oscillator Drive (XOUT)
High-Level Output Source Current
Low-Level Output Sink Current
Clock Outputs (CLKx)
High-Level Output Source Current *
Low-Level Output Sink Current *
Short Circuit Source Current *
Short Circuit Sink Current *
SYMBOL
CONDITIONS/DESCRIPTION
MIN.
TYP.
MAX.
UNITS
I
DD
f
XTAL
= 27MHz; C
L
= 10pF, V
DD
= 3.3V
(depends on output frequencies)
15
mA
C
L(xtal)
As seen by a crystal connected to XIN and
XOUT
R
XTAL
=20Ω;
17
200
pF
uW
V
TH
I
IH
I
IL
860
34
-21
mV
µA
µA
I
OH
I
OL
V(XIN) = 0V, V
O
= 0V
V(XIN) = 3.3V, V
O
= 3.3V
-0.5
15
mA
mA
I
OH
I
OL
I
OSH
I
OSL
V
O
= 2.0V
V
O
= 0.4V
V
O
= 0V; shorted for 30s, max.
V
O
= 3.3V; shorted for 30s, max.
-40
17
-55
55
mA
mA
mA
mA
4
ISO9001
2.28.02
FS6244
Dual VCXO Clock Generator IC
Table 6: DC Electrical Specifications (V
DD
= 5V nominal)
Unless otherwise stated, V
DD
= 5.0V ± 10%, no load on any output, and ambient temperature range T
A
= 0°C to 70°C. Parameters denoted with an asterisk ( * ) represent nominal characterization
data and are not production tested to any specific limits. Where given, MIN and MAX characterization data are
±
3σ from typical. Negative currents indicate current flows out of the device.
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