Three-PLL General Purpose EPROM Programmable Clock Generator Specification Sheet
CY2291
Document #: 38-07189 Rev. *C Page 8 of 12
Switching Characteristics, Industrial 5.0V
Parameter Name Description Min. Typ. Max. Unit
t
1
Output Period Clock output range,
5V operation
CY2291I 11.1
(90 MHz)
13000
(76.923 kHz)
ns
CY2291FI 12.5
(80 MHz)
13000
(76.923 kHz)
ns
Output Duty
Cycle
[11]
Duty cycle for outputs, defined as t
2
÷ t
1
[12]
f
OUT
> 66 MHZ
40% 50% 60%
Duty cycle for outputs, defined as t
2
÷ t
1
[12]
f
OUT
< 66 MHZ
45% 50% 55%
t
3
Rise Time Output clock rise time
[13]
35ns
t
4
Fall Time Output clock fall time
[13]
2.5 4 ns
t
5
Output Disable
Time
Time for output to enter three-state mode after
SHUTDOWN
/OE goes LOW
10 15 ns
t
6
Output Enable
Time
Time for output to leave three-state mode after
SHUTDOWN
/OE goes HIGH
10 15 ns
t
7
Skew
Skew delay between any identical or related outputs
[3,
12, 15]
< 0.25 0.5 ns
t
8
CPUCLK Slew Frequency transition rate 1.0 20.0 MHz/m
s
t
9A
Clock Jitter
[14]
Peak-to-peak period jitter (t
9A
Max. – t
9A
min.),% of
clock period (f
OUT
< 4 MHz)
<0.5 1 %
t
9B
Clock Jitter
[14]
Peak-to-peak period jitter (t
9B
Max. – t
9B
min.) (4 MHz
<
f
OUT
< 16 MHz)
<0.7 1 ns
t
9C
Clock Jitter
[14]
Peak-to-peak period jitter
(16 MHz < f
OUT
<
50 MHz)
<400 500 ps
t
9D
Clock Jitter
[14]
Peak-to-peak period jitter
(f
OUT
> 50 MHz)
<250 350 ps
t
10A
Lock Time for
CPLL
Lock Time from Power Up <25 50 ms
t
10B
Lock Time for
UPLL and SPLL
Lock Time from Power Up <0.25 1 ms
Slew Limits CPU PLL Slew Limits CY2291I 8 90 MHz
CY2291FI 8 80 MHz
Switching Characteristics, Industrial 3.3V
Parameter Name Description Min. Typ. Max. Unit
t
1
Output Period Clock output range, 3.3V
operation
CY2291I 15
(66.6 MHz)
13000
(76.923 kHz)
ns
CY2291FI 16.66
(60 MHz)
13000
(76.923 kHz)
ns
Output Duty
Cycle
[11]
Duty cycle for outputs, defined as t
2
÷ t
1
[12]
f
OUT
> 66 MHZ
40% 50% 60%
Duty cycle for outputs, defined as t
2
÷ t
1
[12]
f
OUT
< 66 MHZ
45% 50% 55%
t
3
Rise Time
Output clock rise time
[13]
35ns
t
4
Fall Time
Output clock fall time
[13]
2.5 4 ns
t
5
Output Disable
Time
Time for output to enter three-state mode after
SHUTDOWN
/OE goes LOW
10 15 ns
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