CY7B991-7JXC Cypress Semiconductor Corp, CY7B991-7JXC Datasheet - Page 15
![IC CLK BUFF SKEW 8OUT 32PLCC](/photos/6/51/65138/428-32-plcc_sml.jpg)
CY7B991-7JXC
Manufacturer Part Number
CY7B991-7JXC
Description
IC CLK BUFF SKEW 8OUT 32PLCC
Manufacturer
Cypress Semiconductor Corp
Type
Buffer/Driverr
Series
RoboClock™r
Specifications of CY7B991-7JXC
Number Of Circuits
1
Package / Case
32-PLCC
Ratio - Input:output
8:8
Differential - Input:output
Yes/Yes
Input
3-State, TTL
Output
TTL
Frequency - Max
80MHz
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Frequency-max
80MHz
Output Frequency Range
3.75 MHz to 80 MHz
Supply Voltage (max)
5.5 V
Supply Voltage (min)
4.5 V
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Operating Supply Voltage
5 V
Clock Ic Type
Clock Buffer
Frequency
80MHz
No. Of Outputs
8
Supply Current
85mA
Supply Voltage Range
4.5V To 5.5V
Digital Ic Case Style
LCC
No. Of Pins
32
Rohs Compliant
Yes
Number Of Elements
1
Operating Supply Voltage (typ)
5V
Operating Temp Range
0C to 70C
Package Type
PLCC
Operating Supply Voltage (min)
4.5V
Operating Supply Voltage (max)
5.5V
Operating Temperature Classification
Commercial
Pin Count
32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
428-1717-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
CY7B991-7JXC
Manufacturer:
CY
Quantity:
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Company:
Part Number:
CY7B991-7JXC
Manufacturer:
Cypress Semiconductor Corp
Quantity:
10 000
Company:
Part Number:
CY7B991-7JXCT
Manufacturer:
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Quantity:
10 000
range since the highest frequency output is running at 20 MHz.
Figure 9
3Qx and 4Qx outputs. These include inverted outputs and
outputs that offer divide-by-2 and divide-by-4 timing. An inverted
output enables the system designer to clock different
subsystems on opposite edges, without suffering from the pulse
asymmetry typical of non-ideal loading. This function enables
each of the two subsystems to clock 180 degrees out of phase
and align within the skew specifications.
The divided outputs offer a zero delay divider for portions of the
system that need the clock divided by either two or four, and still
remain within a narrow skew of the “1X” clock. Without this
feature, an external divider is added, and the propagation delay
Document Number: 38-07138 Rev. *I
DISTRIBUTION
20 MHz
CLOCK
shows some of the functions that are selectable on the
FB
REF
FS
4F0
4F1
3F0
3F1
2F0
2F1
1F0
1F1
TEST
4Q0
4Q1
3Q0
3Q1
2Q0
2Q1
1Q0
1Q1
Figure 9. Multi-Function Clock Driver
REF
of the divider adds to the skew between the different clock
signals.
These divided outputs, coupled with the Phase Locked Loop,
enables the PSCB to multiply the clock rate at the REF input by
either two or four. This mode enables the designer to distribute
a low frequency clock between various portions of the system,
and then locally multiply the clock rate to a more suitable
frequency, still maintaining the low skew characteristics of the
clock driver. The PSCB performs all of the functions described in
this section at the same time. It multiplies by two and four or
divides by two (and four) at the same time. In other words, it is
shifting its outputs over a wide range or maintaining zero skew
between selected outputs.
SKEWED –3.125 ns (–4t
80 MHz
ZERO SKEW
INVERTED
80 MHz
20 MHz
80 MHz
U
)
Z
0
Z
Z
0
Z
0
0
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