Switching characteristics, industrial 5.0v, Switching characteristics, industrial 3.3v, Cy2291 – Cypress CY2291 User Manual
Page 8
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
Duty cycle for outputs, defined as t
2
÷ t
1
f
OUT
> 66 MHZ
40%
50%
60%
Duty cycle for outputs, defined as t
2
÷ t
1
f
OUT
< 66 MHZ
45%
50%
55%
t
3
Rise Time
Output clock rise time
3
5
ns
t
4
Fall Time
Output clock fall time
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
< 0.25
0.5
ns
t
8
CPUCLK Slew
Frequency transition rate
1.0
20.0
MHz/m
s
t
9A
Clock Jitter
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
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
Peak-to-peak period jitter
(16 MHz < f
OUT
<
50 MHz)
<400
500
ps
t
9D
Clock Jitter
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
Duty cycle for outputs, defined as t
2
÷ t
1
f
OUT
> 66 MHZ
40%
50%
60%
Duty cycle for outputs, defined as t
2
÷ t
1
f
OUT
< 66 MHZ
45%
50%
55%
t
3
Rise Time
Output clock rise time
3
5
ns
t
4
Fall Time
Output clock fall time
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