cy2277a Cypress Semiconductor Corporation., cy2277a Datasheet - Page 12

• Manufacturer Part Number: cy2277a
• Description: 6x86, K6 Clock Synthesizer/driver For Desktop Mobile Pcs With Intel 82430tx And 2 Dimms Or 3 So-dimms Semiconductor
• Manufacturer: Cypress Semiconductor Corporation.

Switching Characteristics (-12I)
Document #: 38-07332 Rev. *A
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Parameter
1
2
2
2
2
2
3
3
4
4
5
6
7
8
8
9
10
All Clocks
CPUCLK,
IOAPIC
PCI
REF0
SDRAM
REF1
USBCLK
IOCLK
CPUCLK
USBCLK,
IOCLK
CPUCLK
USBCLK,
IOCLK
CPUCLK
CPUCLK,
PCICLK
CPUCLK,
SDRAM
CPUCLK
PCICLK
CPUCLK,
PCICLK,
SDRAM
CPU, PCI,
SDRAM
Output
Output Duty Cycle
CPU and IOAPIC Clock
Rising and Falling Edge
Rate
PCI Clock Rising and
Falling Edge Rate
REF0 Clock Rising and
Falling Edge Rate
SDRAM Rising and Fall-
ing Edge Rate
REF1, USB and IO Rising
and Falling Edge Rate
CPU Clock Rise Time
USB Clock and I/O Clock
Rise Time
CPU Clock Fall Time
USB Clock and I/O Clock
Fall Time
CPU-CPU Clock Skew
CPU-PCI Clock Skew
(-12)
CPU-SDRAM Clock
Skew
Cycle-Cycle Clock Jitter
Cycle-Cycle Clock Jitter
Power-up Time
Frequency Slew Rate
Description
[9, 10, 11]
[12]
t
Between 0.6V and 1.8V, V
Between 0.4V and 2.4V, V
CPU clocks at 66.6 MHz
Between 0.4V and 2.4V, V
Between 0.8V and 2.4V, V
Between 0.5V and 2.0V
SDRAM clocks at 66.6 MHz
Between 0.4V and 2.4V
Between 0.4V and 2.0V, V
Between 0.4V and 2.4V, V
Between 0.4V and 2.4V
Between 2.0V and 0.4V, V
Between 2.4V and 0.4V, V
Between 2.4V and 0.4V
Measured at 1.25V, V
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, V
Measured at 1.25V for 2.5V clocks and
at 1.5V for 3.3V clocks, V
Measured at 1.5V
CPU, PCI, and SDRAM clock stabiliza-
tion from power-up
Rate of change of frequency
1
= t
1A
t
1B
Test Conditions
DDCPU
DDCPU
DDCPU
DDCPU
DDCPU
DDCPU
DDCPU
DDCPU
DDCPU
DDCPU
DDCPU
= 2.5V
= 2.5V
=2.5V
= 2.5V
= 3.3V
= 3.3V
= 3.3V
= 2.5V
= 3.3V
= 2.5V
= 3.3V
Min.
1.0
1.0
0.5
0.4
0.4
1.0
0.4
0.4
1.0
1.0
45
.8
.9
1
Typ.
100
50
2
CY2277A
Max.
Page 12 of 19
250
625
350
500
4.0
4.0
4.0
4.0
4.0
2.0
3.0
2.0
4.0
3.0
2.0
4.0
4.0
55
3
MHz/
V/ns
V/ns
V/ns
V/ns
V/ns
Unit
ms
ms
ns
ns
ns
ns
ps
ns
ps
ps
ps
%