8523BGLF Integrated Device Technology (Idt), 8523BGLF Datasheet - Page 9

• Manufacturer Part Number: 8523BGLF
• Description: Clock Driver 2-IN HSTL 20-Pin TSSOP Tube
• Manufacturer: Integrated Device Technology (Idt)

Specifications of 8523BGLF

• Package: 20TSSOP
• Configuration: 1 x 2:1
• Input Signal Type: CML|HCSL|HSTL|LVDS|LVPECL|SSTL
• Maximum Output Frequency: 650 MHz
• Operating Supply Voltage: 3.3 V

ICS8523 Data Sheet
3.3V Differential Clock Input Interface
The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL and
other differential signals. Both differential signals must meet the V
and V
examples for the CLK/nCLK input driven by the most common driver
types. The input interfaces suggested here are examples only.
Figure 3A. CLK/nCLK Input Driven by an IDT Open
Emitter LVHSTL Driver
Figure 3C. CLK/nCLK Input Driven by a
Figure 3E. CLK/nCLK Input Driven by a
ICS8523CG REVISION E JANUARY 24, 2011
CMR
3.3V
3.3V
1.8V
HCSL
LVPECL
input requirements. Figures 3A to 3F show interface
*Optional – R3 and R4 can be 0Ω
LVHSTL
IDT
LVHSTL Driver
3.3V LVPECL Driver
3.3V HCSL Driver
*R3
*R4
Zo = 50Ω
Zo = 50Ω
33Ω
33Ω
Zo = 50Ω
Zo = 50Ω
Zo = 50Ω
Zo = 50Ω
R3
125Ω
3.3V
R1
50Ω
R1
84Ω
R1
50Ω
R4
125Ω
R2
50Ω
R2
84Ω
R2
50Ω
CLK
nCLK
CLK
nCLK
CLK
nCLK
3.3V
3.3V
3.3V
Differential
Input
Differential
Input
Differential
Input
PP
9
Please consult with the vendor of the driver component to confirm the
driver termination requirements. For example, in Figure 3A, the input
termination applies for IDT open emitter LVHSTL drivers. If you are
using an LVHSTL driver from another vendor, use their termination
recommendation.
Figure 3B. CLK/nCLK Input Driven by a
Figure 3D. CLK/nCLK Input Driven by a 3.3V LVDS Driver
Figure 3F. CLK/nCLK Input Driven by a
3.3V
3.3V
2.5V
LVDS
LVPECL
SSTL
LOW SKEW, 1-TO-4, DIFFERENTIAL-TO-HSTL FANOUT BUFFER
3.3V LVPECL Driver
2.5V SSTL Driver
Zo = 50Ω
Zo = 50Ω
Zo = 60Ω
Zo = 60Ω
Zo = 50Ω
Zo = 50Ω
©2011 Integrated Device Technology, Inc.
R3
120Ω
2.5V
R1
50Ω
R1
120Ω
R2
50Ω
R4
120Ω
R2
50Ω
R2
120Ω
R1
100Ω
CLK
nCLK
CLK
nCLK
CLK
nCLK
3.3V
3.3V
3.3V
Differential
Input
Receiver
Differential
Input