83940BYLF IDT, Integrated Device Technology Inc, 83940BYLF Datasheet - Page 7

• Manufacturer Part Number: 83940BYLF
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Driverr

Specifications of 83940BYLF

• Number Of Clock Inputs: 2
• 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: LQFP
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 32
• 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
83940BY
IRING THE
D
IFFERENTIAL
I
F
NPUT TO
IGURE
Single Ended Clock Input
1. S
A
A
PPLICATION
INGLE
CCEPT
C1
0.1u
E
NDED
S
V_REF
INGLE
DD
www.idt.com
/2 is
LVPECL-
S
IGNAL
E
7
I
NDED
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.
NFORMATION
1K
R1
1K
R2
D
RIVING
VDD
L
TO
EVELS
nPCLK
PCLK
D
-LVCMOS/LVTTL F
IFFERENTIAL
I
NPUT
DD
= 3.3V, V_REF should be 1.25V
L
OW
S
ICS83940
ANOUT
REV. A NOVEMBER 17, 2010
KEW
, 1-
B
TO
UFFER
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