ICS87321AMILF IDT, Integrated Device Technology Inc, ICS87321AMILF Datasheet - Page 10

• Manufacturer Part Number: ICS87321AMILF
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Dividerr

Specifications of ICS87321AMILF

• Number Of Clock Inputs: 1
• Mode Of Operation: Differential
• 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: SOIC N
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Lead Free Status / Rohs Status: Compliant

R
I
LVCMOS C
All control pins have internal pulldowns; additional resistance is
not required but can be added for additional protection. A 1k
resistor can be used.
T
The clock layout topology shown below is a typical termination
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 50
IDT
NPUTS
RTT =
ERMINATION FOR
ECOMMENDATIONS FOR
ICS87321I
÷1, ÷2 DIFFERENTIAL-TO-3.3V LVPECL CLOCK GENERATOR
™
/ ICS
((V
:
F
™
FOUT
IGURE
OH
3.3V LVPECL CLOCK GENERATOR
ONTROL
+ V
OL
3A. LVPECL O
) / (V
1
P
INS
3.3V LVPECL O
CC
Z
Z
– 2)) – 2
o
o
= 50
= 50
U
NUSED
Z
o
50
UTPUT
I
NPUT
T
RTT
ERMINATION
UTPUTS
50
P
V
INS
CC
FIN
- 2V
10
transmission lines. Matched impedance techniques should be
used to maximize operating frequency and minimize signal dis-
tortion. Figures 3A and 3B show two different layouts which are
recommended only as guidelines. Other suitable clock layouts
may exist and it would be recommended that the board design-
ers simulate to guarantee compatibility across all printed circuit
and clock component process variations.
FOUT
F
IGURE
3B. LVPECL O
Z
Z
o
o
= 50
= 50
125
84
ICS87321AMI REV. A APRIL 7, 2009
UTPUT
3.3V
125
84
T
ERMINATION
FIN