ICS853031AY IDT, Integrated Device Technology Inc, ICS853031AY Datasheet - Page 13

• Manufacturer Part Number: ICS853031AY
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Driverr

Specifications of ICS853031AY

• Number Of Clock Inputs: 2
• Mode Of Operation: Differential
• Output Frequency: >1600MHz
• Output Logic Level: ECL/LVPECL
• Operating Supply Voltage (min): -2.375/2.375V
• Operating Supply Voltage (typ): -2.5/-3.3/3.3V
• Operating Supply Voltage (max): -3.465/3.465V
• Package Type: LQFP
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 32
• Lead Free Status / Rohs Status: Not Compliant

T
IDT
The clock layout topology shown below is a typical termina-
tion for LVPECL outputs. The two different layouts men-
tioned 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
ERMINATION FOR
ICS853031
LOW SKEW, 1-TO-9, DIFFERENTIAL-TO-2.5, 3.3V LVPECL/ECL FANOUT BUFFER
™
RTT =
/ ICS
™
((V
F
1-TO-9, 2.5V, 3.3V LVPECL/ECL FANOUT BUFFER
FOUT
IGURE
OH
+ V
OL
6A. LVPECL O
) / (V
3.3V LVPECL O
1
CC
Z
Z
– 2)) – 2
o
o
= 50
= 50
Z
o
50
UTPUT
UTPUTS
T
RTT
ERMINATION
50
V
CC
FIN
- 2V
13
drive 50 transmission lines. Matched impedance techniques
should be used to maximize operating frequency and mini-
mize signal distortion. Figures 6A and 6B show two different
layouts which are recommended only as guidelines. Other
suitable clock layouts may exist and it would be recommended
that the board designers simulate to guarantee compatibility
across all printed circuit and clock component process varia-
tions.
FOUT
F
IGURE
6B. LVPECL O
Z
Z
o
o
= 50
= 50
ICS853031AY REV. C AUGUST 12, 2008
125
84
UTPUT
3.3V
125
84
T
ERMINATION
FIN