ICS870S208BKT IDT, Integrated Device Technology Inc, ICS870S208BKT Datasheet - Page 12

• Manufacturer Part Number: ICS870S208BKT
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Dividerr

Specifications of ICS870S208BKT

• Number Of Clock Inputs: 2
• Mode Of Operation: Differential
• Output Frequency: 250MHz
• 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
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 32
• Lead Free Status / RoHS Status: Not Compliant

W
R
IDT
Figure 2 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
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
ICS870S208
DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER W/DIVIDER AND GLITCHLESS SWITCH
IRING THE
™
/ ICS
:
™
LVCMOS FANOUT BUFFER W/DIVIDER
ONTROL
NPUTS
D
IFFERENTIAL
P
INS
U
NUSED
I
NPUT TO
F
IGURE
I
NPUT AND
A
Single Ended Clock Input
2. S
CCEPT
A
PPLICATION
INGLE
O
S
UTPUT
INGLE
E
NDED
C1
0.1u
DD
V_REF
/2 is
E
P
S
NDED
INS
IGNAL
12
I
L
NFORMATION
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.
O
LVCMOS O
All unused LVCMOS output can be left floating. There should be
no trace attached.
D
EVELS
RIVING
UTPUTS
R1
1K
R2
1K
V
DD
D
CLKx
nCLKx
IFFERENTIAL
:
UTPUTS
I
NPUT
ICS870S208BK REV. A NOVEMBER 9, 2007
DD
= 3.3V, V_REF should be 1.25V
PRELIMINARY