CY2273A Cypress Semiconductor, CY2273A Datasheet - Page 9

• Manufacturer Part Number: CY2273A
• Description: K6 Clock Synthesizer/Driver
• Manufacturer: Cypress Semiconductor

Switching Characteristics for CY2273A-4
Timing Requirement for the I
Switching Waveforms
Duty Cycle Timing
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Parameter
1
2
2
3
4
5
6
7
8
10
10
10
11
12
13
14
15
16
17
18
19
20
21
22
Parameter
All
CPUCLK
SDRAM
PCI, REF0,
USB
CPUCLK
CPUCLK
CPUCLK
CPUCLK,
PCICLK
CPUCLK,
SDRAM
PCICLK,
PCICLK
CPUCLK,
PCICLK
CPUCLK,
PCICLK,
SDRAM
SDRAM
SCLK Clock Frequency
Time the bus must be free before a new transmission can start
Hold time start condition. After this period the first clock pulse is generated.
The Low period of the clock.
The High period of the clock.
Set-up time for start condition. (Only relevant for a repeated start condition.)
Hold time DATA
DATA input set-up time
Rise time of both SDATA and SCLK inputs
Fall time of both SDATA and SCLK inputs
Se-up time for stop condition
Output
for CBUS compatible masters.
for I
2
C devices
Output Duty Cycle
CPU Clock Rising and
Falling Edge Rate
SDRAM, PCI, REF0,
USB Clock Rising and
Falling Edge Rate
CPU Clock Rise Time
CPU Clock Fall Time
CPU-CPU Clock Skew
CPU-PCI Clock Skew
CPU-SDRAM Clock
Skew
PCI-PCI Clock Skew
Cycle-Cycle Clock Jitter
Cycle-Cycle Clock Jitter
Cycle-Cycle Clock Jitter
Power-up Time
t
1A
Description
t
1B
2
C Bus
Description
[9]
[8]
Over the Operating Range
t
Between 0.4V and 2.0V, V
Between 0.4V and 2.4V
Between 0.4V and 2.0V, V
Between 2.0V and 0.4V, V
Measured at 1.25V
Measured at 1.25V for 2.5V clocks, and
at 1.5V for 3.3V clocks
Measured at 1.25V for 2.5V clocks, and
at 1.5V for 3.3V clocks
Measured at 1.5V
Measured at 1.25V, V
Measured at 1.5V
Measured at 1.5V
CPU, PCI, AGP, and SDRAM clock sta-
bilization from power-up
1
= t
1A
9
t
1B
Test Conditions
DDCPU
DDCPU
DDCPU
DDCPU
= 2.5V
= 2.5V 0.75
= 2.5V
= 2.5V
Min.
250
4.7
4.7
4.0
4.7
4
4
0
5
0
Min.
0.85
0.4
0.4
45
Typ.
100
1.0
1.0
50
Max.
100
300
1
CY2273A
Max.
1200
1200
2.13
2.13
250
650
500
650
650
4.0
4.0
55
3
Unit
kHz
Unit
V/ns
V/ns
ns
ns
ms
ns
ns
ps
ps
ps
ps
ps
ps
ps
%
s
s
s
s
s
s
s
s