ICS8536AG-01T IDT, Integrated Device Technology Inc, ICS8536AG-01T Datasheet - Page 11

• Manufacturer Part Number: ICS8536AG-01T
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Driverr

Specifications of ICS8536AG-01T

• Number Of Clock Inputs: 3
• Output Frequency: 700MHz
• Output Logic Level: LVPECL
• Operating Supply Voltage (min): 2.375V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.465V
• Package Type: TSSOP
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 24
• Lead Free Status / RoHS Status: Not Compliant

C
The ICS8536-01 has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in Figure 2 below
LVCMOS
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC coupling capacitor. A general interface diagram is
shown in Figure 3. The XTAL_OUT pin can be left floating. The
input edge rate can be as slow as 10ns. For LVCMOS inputs, it is
recommended that the amplitude be reduced from full swing to
half swing in order to prevent signal interference with the power
rail and to reduce noise. This configuration requires that the output
IDT
RYSTAL
ICS8536-01
LOW SKEW, 1-TO-6, CRYSTAL/LVCMOS/DIFFERENTIAL-TO-3.3V, 2.5V LVPECL FANOUT BUFFER
™
/ ICS
™
I
3.3V, 2.5V LVPECL FANOUT BUFFER
NPUT
TO
XTAL I
I
NTERFACE
NTERFACE
F
IGURE
3. G
VDD
Ro
18pF Parallel Crystal
ENERAL
D
F
IAGRAM FOR
IGURE
Rs
Zo = Ro + Rs
X1
2. C
Zo = 50
RYSTAL
LVCMOS D
11
were determined using an 18pF parallel resonant crystal and
were chosen to minimize the ppm error.
impedance of the driver (Ro) plus the series resistance (Rs) equals
the transmission line impedance. In addition, matched termination
at the crystal input will attenuate the signal in half. This can be
done in one of two ways. First, R1 and R2 in parallel should equal
the transmission line impedance. For most 50
and R2 can be 100 . This can also be accomplished by removing
R1 and making R2 50 .
I
NPU
C1
22p
C2
22p
VDD
t I
RIVER TO
NTERFACE
R1
R2
XTAL_IN
XTAL_OUT
.1uf
XTAL I
XTAL_IN
XTAL_OUT
ICS8536AG-01 REV. A FEBRUARY 24, 2009
NPUT
I
NTERFACE
applications, R1