ICS8344BYIT IDT, Integrated Device Technology Inc, ICS8344BYIT Datasheet - Page 10

• Manufacturer Part Number: ICS8344BYIT
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Driverr

Specifications of ICS8344BYIT

• Number Of Clock Inputs: 2
• Mode Of Operation: Differential
• Output Frequency: 100MHz
• Output Logic Level: LVCMOS/LVTTL
• Operating Supply Voltage (min): 2.375V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.465V
• Package Type: LQFP
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 48
• Quiescent Current: 95mA
• Lead Free Status / RoHS Status: Compliant

W
Figure 1 shows how the differential input can be wired to accept
single ended levels. The reference voltage V_REF = V
generated by the bias resistors R1, R2 and C1. This bias circuit
should be located as close as possible to the input pin. The ratio
IDT
R
I
CLK/nCLK I
For applications not requiring the use of the differential input,
both CLK and nCLK can be left floating. Though not required, but
for additional protection, a 1kΩ resistor can be tied from CLK to
ground.
LVCMOS C
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional
protection. A 1kΩ resistor can be used.
NPUTS
ECOMMENDATIONS FOR
ICS8344I
LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER
IRING THE
™
/ ICS
:
™
LVCMOS/LVTTL FANOUT BUFFER
ONTROL
NPUTS
D
IFFERENTIAL
P
INS
U
NUSED
I
NPUT TO
F
IGURE
Single Ended Clock Input
I
NPUT AND
A
CCEPT
1. S
A
PPLICATION
INGLE
O
S
INGLE
UTPUT
C1
0.1u
E
NDED
V_REF
DD
/2 is
E
P
S
NDED
IGNAL
INS
10
I
1K
L
NFORMATION
R1
1K
R2
of R1 and R2 might need to be adjusted to position the V_REF in
the center of the input voltage swing. For example, if the input
clock swing is only 2.5V and V
and R2/R1 = 0.609.
D
O
LVCMOS O
All unused LVCMOS output can be left floating. There should be
no trace attached.
EVELS
RIVING
VDD
UTPUTS
nCLKx
CLKx
D
IFFERENTIAL
:
UTPUTS
I
NPUT
ICS8344BYI REV. B February 20, 2009
DD
= 3.3V, V_REF should be 1.25V