83940DYLFT IDT, Integrated Device Technology Inc, 83940DYLFT Datasheet - Page 10

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

Specifications of 83940DYLFT

• 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
83940DY
IRING THE
D
IFFERENTIAL
I
F
NPUT TO
IGURE
Single Ended Clock Input
1. S
A
A
PPLICATION
CCEPT
INGLE
E
C1
0.1u
S
NDED
V_REF
INGLE
LVPECL-
DD
www.idt.com
/2 is
S
IGNAL
E
10
I
NDED
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.
D
1K
R1
1K
R2
RIVING
VDD
TO
L
EVELS
-LVCMOS / LVTTL F
nPCLK
D
PCLK
IFFERENTIAL
I
NPUT
DD
= 3.3V, V_REF should be 1.25V
L
OW
ICS83940D
S
ANOUT
KEW
REV. B AUGUST 9, 2010
, 1-
B
TO
UFFER
-18