ICS858012AKLF IDT, Integrated Device Technology Inc, ICS858012AKLF Datasheet - Page 9

• Manufacturer Part Number: ICS858012AKLF
• Description: IC FANOUT BUFFER 1-2 16-VFQFPN
• Manufacturer: IDT, Integrated Device Technology Inc
• Series: HiPerClockS™r
• Type: Fanout Buffer (Distribution)r

Specifications of ICS858012AKLF

• Number Of Circuits: 1
• Ratio - Input:output: 1:2
• Differential - Input:output: Yes/Yes
• Input: HCSL, LVDS, LVHSTL, LVPECL, SSTL
• Output: LVPECL
• Frequency - Max: 2GHz
• Voltage - Supply: 2.375 V ~ 3.63 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-VFQFN
• Frequency-max: 2GHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 858012AKLF

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 gen-
erate ECL/LVPECL compatible outputs. Therefore, terminating
resistors (DC current path to ground) or current sources must
be used for functionality. These outputs are designed to drive
858012AK
R
O
LVPECL O
All unused LVPECL outputs can be left floating. We recommend
that there is no trace attached. Both sides of the differential
output pair should either be left floating or terminated.
RTT =
ERMINATION FOR
ECOMMENDATIONS FOR
UTPUTS
((V
F
FOUT
OH
IGURE
:
UTPUT
+ V
OL
5A. LVPECL O
) / (V
1
CC
3.3V LVPECL O
Z
Z
– 2)) – 2
o
o
= 50Ω
= 50Ω
U
NUSED
Z
o
50Ω
UTPUT
O
T
UTPUT
RTT
ERMINATION
UTPUTS
50Ω
PRELIMINARY
V
CC
P
INS
FIN
- 2V
9
50Ω transmission lines. Matched impedance techniques should
be used to maximize operating frequency and minimize signal
distortion. Figures 5A and 5B show two different layouts which
are recommended only as guidelines. Other suitable clock lay-
outs may exist and it would be recommended that the board
designers simulate to guarantee compatibility across all printed
circuit and clock component process variations.
FOUT
2.5V, 3.3V LVPECL F
L
F
IGURE
OW
S
5B. LVPECL O
KEW
Z
Z
o
o
= 50Ω
= 50Ω
, 1-
TO
125Ω
84Ω
-2, D
UTPUT
3.3V
ICS858012
125Ω
84Ω
IFFERENTIAL
T
ANOUT
ERMINATION
REV. A OCTOBER 28, 2008
FIN
B
UFFER
-
TO
-