ICS87321AMILF IDT, Integrated Device Technology Inc, ICS87321AMILF Datasheet - Page 8

• Manufacturer Part Number: ICS87321AMILF
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Dividerr

Specifications of ICS87321AMILF

• Number Of Clock Inputs: 1
• Mode Of Operation: Differential
• Output Logic Level: LVPECL
• 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: Compliant

O
W
IDT
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
UTPUT
ICS87321I
÷1, ÷2 DIFFERENTIAL-TO-3.3V LVPECL CLOCK GENERATOR
IRING THE
™
/ ICS
nQ
D
Q
™
UTY
3.3V LVPECL CLOCK GENERATOR
D
C
YCLE
IFFERENTIAL
/P
P
t
PW
ULSE
ARAMETER
odc =
W
t
PERIOD
t
IDTH
I
PERIOD
NPUT TO
t
PW
/P
F
ERIOD
IGURE
x 100%
Single Ended Clock Input
A
M
CCEPT
1. S
A
EASUREMENT
PPLICATION
INGLE
S
INGLE
E
C1
0.1u
NDED
V_REF
CC
/2 is
E
NDED
S
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.
I
D
1K
EVELS
R1
1K
R2
NFORMATION
RIVING
VCC
CLK
nCLK
D
IFFERENTIAL
,
I
NPUT
CONTINUED
CC
ICS87321AMI REV. A APRIL 7, 2009
= 3.3V, V_REF should be 1.25V