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PDF ICS291 Data sheet ( Hoja de datos )
| Número de pieza | ICS291 | |
| Descripción | TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER | |
| Fabricantes | Integrated Device Technology | |
| Logotipo |  |
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DATASHEET
TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER ICS291
Description
The ICS291 field programmable spread spectrum clock
synthesizer generates up to six high-quality, high-frequency
clock outputs including multiple reference clocks from a
low-frequency crystal input. It is designed to replace
crystals, crystal oscillators and stand alone spread
spectrum devices in most electronic systems.
Using IDT’s VersaClockTM software to configure PLLs and
outputs, the ICS291 contains a One-Time Programmable
(OTP) ROM for field programmability. Programming
features include input/output frequencies, spread spectrum
amount, eight selectable configuration registers and up to
two sets of three low-skew outputs.
Each of the two output groups are powered by a separate
VDDO voltage. VDDO may vary from 1.8 V to VDD.
Using Phase-Locked Loop (PLL) techniques, the device
runs from a standard fundamental mode, inexpensive
crystal, or clock. It can replace multiple crystals and
oscillators, saving board space and cost.
The ICS291 is also available in factory programmed custom
versions for high-volume applications.
Features
• Packaged as 20-pin TSSOP – Pb-free, RoHS compliant
• Eight addressable registers
• Replaces multiple crystals and oscillators
• Output frequencies up to 200 MHz at 3.3 V
• Configurable Spread Spectrum Modulation
• Input crystal frequency of 5 to 27 MHz
• Clock input frequency of 3 to 166 MHz
• Up to six reference outputs
• Separate 1.8 to 3.3 V VDDO output level controls for
each bank of 3 outputs
• Up to two sets of three low-skew outputs
• Operating voltages of 3.3 V
• Controllable output drive levels
• Advanced, low-power CMOS process
Block Diagram
VDD 3
VDDO1
S2:S0 3
OTP
ROM
with PLL
Values
X1/ICLK
Crystal or
Clock Input
X2
Crystal
Oscillator
External capacitors
are required with a crystal input.
PLL1 with
Spread
Spectrum
PLL2
PLL3
Divide
Logic
and
Output
Enable
Control
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
GND 3
PDTS
VDDO2
IDT™ / ICS™ TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 1
ICS291
REV F 051310
1 page  
ICS291
TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER
EPROM CLwOwCwK.DSatYaSNhTeeHt4EUS.coIZmER
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature -40 to +85° C
Parameter
Symbol
Conditions
Min. Typ.
Operating Voltage
VDD
3.135
VDDO Voltage
VDDO1 and VDDO2
1.80
Config. Dependent - See
VersaClockTM Estimates
Operating Supply Current IDD Six 33.3333 MHz outs,
VDD=VDDO=3.3 V;
PDTS = 1, no load, Note 1
25
PDTS = 0, no load
Input High Voltage
VIH S2:S0
Input Low Voltage
VIL S2:S0
Input High Voltage, PDTS VIH
Input Low Voltage, PDTS VIL
Input High Voltage
VIH ICLK
Input Low Voltage
VIL ICLK
Output High Voltage
(CMOS High)
VOH IOH = -4 mA
VDD/2+1
500
VDD-0.5
VDD/2+1
VDD-0.4
Output High Voltage
Output Low Voltage
Short Circuit Current
VOH IOH = -8 mA (Low Drive);
2.4
IOH = -12 mA (High Drive) VDDO-0.4
VOL IOL = 8 mA (Low Drive);
IOL = 12 mA (High Drive)
IOS Low Drive
±40
High Drive
±70
Nom. Output Impedance
Internal Pull-up Resistor
Internal Pull-down
Resistor
ZO
RPUS
RPD
S2:S0, PDTS
CLK outputs
20
190
120
Input Capacitance
CIN Inputs
4
Max.
3.465
VDD
Units
V
V
mA
mA
0.4
0.4
VDD/2-1
µA
V
V
V
V
V
V
V
V
0.4 V
mA
Ω
kΩ
kΩ
pF
Note 1: Example with 25 MHz crystal input with six outputs of 33.3 MHz, no load, and VDD = 3.3 V.
IDT™ / ICS™ TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 5
ICS291
REV F 051310
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ICS291.PDF ] | |
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