ICS8430AY-61 IDT, Integrated Device Technology Inc, ICS8430AY-61 Datasheet - Page 11

• Manufacturer Part Number: ICS8430AY-61
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: PLL Frequency Synthesizerr

Specifications of ICS8430AY-61

• Number Of Elements: 1
• Supply Current: 155mA
• Pll Input Freq (min): 14MHz
• Pll Input Freq (max): 27MHz
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 70C
• Package Type: LQFP
• Output Frequency Range: 20.83 to 500MHz
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.465V
• Operating Temperature Classification: Commercial
• Pin Count: 32
• Lead Free Status / Rohs Status: Not Compliant

T
The clock layout topology shown below is a typical termina-
tion for LVPECL outputs. The two different layouts mentioned
are recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, termi-
nating resistors (DC current path to ground) or current sources
must be used for functionality. These outputs are designed to
drive 50Ω transmission lines. Matched impedance tech-
8430AY-61
RTT =
ERMINATION FOR
((V
F
FOUT
OH
IGURE
+ V
OL
5A. LVPECL O
) / (V
1
3.3V LVPECL O
CC
Z
Z
– 2)) – 2
o
o
= 50Ω
= 50Ω
Z
o
50Ω
UTPUT
T
ERMINATION
RTT
UTPUTS
50Ω
V
CC
FIN
- 2V
www.idt.com
500MH
11
niques should be used to maximize operating frequency
and minimize signal distortion. There are a few simple ter-
mination schemes. Figures 5A and 5B show two different
layouts which are recommended only as guidelines. Other
suitable clock layouts may exist and it would be recom-
mended that the board designers simulate to guarantee
compatibility across all printed circuit and clock component
process variations.
Z
, C
FOUT
F
RYSTAL
IGURE
LVPECL F
5B. LVPECL O
-
TO
Z
Z
o
o
= 50Ω
= 50Ω
-3.3V, 2.5V D
REQUENCY
125Ω
84Ω
UTPUT
ICS8430-61
3.3V
T
125Ω
84Ω
ERMINATION
S
IFFERENTIAL
YNTHESIZER
REV. D JULY 27, 2010
FIN