ICS87021AMIT IDT, Integrated Device Technology Inc, ICS87021AMIT Datasheet - Page 8

• Manufacturer Part Number: ICS87021AMIT
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Dividerr

Specifications of ICS87021AMIT

• Number Of Clock Inputs: 1
• 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
• 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: Not 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
R
I
LVCMOS C
All control pins have internal pullups or pulldowns; additional
resistance is not required but can be added for additional
protection. A 1k
IDT
NPUTS
ECOMMENDATIONS FOR
ICS87021I
÷1/÷2 DIFFERENTIAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
IRING THE
™
/ ICS
:
™
LVCMOS CLOCK GENERATOR
ONTROL
D
IFFERENTIAL
resistor can be used.
P
INS
U
NUSED
I
NPUT TO
F
IGURE
I
NPUT AND
Single Ended Clock Input
A
CCEPT
1. S
A
PPLICATION
INGLE
O
S
UTPUT
INGLE
E
C1
0.1u
NDED
V_REF
DD
E
/2 is
P
NDED
S
INS
IGNAL
8
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
1K
R1
1K
R2
UTPUTS
RIVING
VDD
D
CLK
nCLK
:
IFFERENTIAL
UTPUTS
I
NPUT
ICS87021AMI REV. B AUGUST 26, 2008
DD
= 3.3V, V_REF should be 1.25V