ICS8536AG-02T IDT, Integrated Device Technology Inc, ICS8536AG-02T Datasheet - Page 10

• Manufacturer Part Number: ICS8536AG-02T
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Driverr

Specifications of ICS8536AG-02T

• Number Of Clock Inputs: 3
• Mode Of Operation: Single-Ended
• Output Frequency: 266MHz
• 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
• Signal Type: LVCMOS/LVTTL
• Mounting: Surface Mount
• Pin Count: 24
• Lead Free Status / RoHS Status: Compliant

Crystal Input Interface
The ICS8536-02 has been characterized with 18pF parallel resonant
crystals. The capacitor values shown in Figure 2 below were
determined using an 18pF parallel resonant crystal and were chosen
to minimize the ppm error.
Overdriving the XTAL Interface
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC coupling capacitor. A general interface diagram is
shown in Figure 3A. The XTAL_OUT pin can be left floating. The
maximum amplitude of the input signal should not exceed 2V and the
input edge rate can be as slow as 10ns. This configuration requires
that the output impedance of the driver (Ro) plus the series
resistance (Rs) equals the transmission line impedance. In addition,
Figure 3A. General Diagram for LVCMOS Driver to XTAL Input Interface
Figure 3B. General Diagram for LVPECL Driver to XTAL Input Interface
ICS8536-02 Data Sheet
ICS8536AG-02 REVISION A JULY 21, 2010
3.3V
Driv er_LVCMOS
VCC=3.3V
Ro ~ 7 Ohm
LVPECL
RS
43
Zo = 50 Ohm
Zo = 50 Ohm
Zo = 50 Ohm
R2
50
R1
100
R2
100
R1
50
R3
50
3.3V
C1
0.1uF
C1
0.1uF
XTAL_IN
XTAL_OUT
XTAL_IN
XTAL_OUT
Cry stal Input Interf ace
Cry stal Input Interf ace
10
Figure 2. Crystal Input Interface
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
applications, R1 and R2 can be 100
by removing R1 and making R2 50
oscillator, the device will be functional, but note, the device
performance is guaranteed by using a quartz crystal.
1-TO-6, DUALCRYSTAL/LVCMOS-TO-3.3V, 2.5V LVPECL FANOUT BUFFER
18pF Parallel Crystal
X1
©2010 Integrated Device Technology, Inc.
Ω
Ω
C1
33pF
C2
27pF
. This can also be accomplished
. By overdriving the crystal
XTAL_IN
XTAL_OUT
Ω