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CY2278A Datasheet

  • CY2278A

  • Clocks and Buffers

  • 12頁

  • ETC

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8A
CY2278A
Pentium
錚?/div>
/II Clock Synthesizer/Driver for Mobile PCs
with Intel
錚?/div>
82430TX and No SDRAM
Features
鈥?Mixed 2.5V and 3.3V operation
鈥?Complete clock solution to meet requirements of mo-
bile Pentium
廬
and Pentium
廬
II motherboards
鈥?Seven CPU clock outputs (three at 3.3V, and four at
2.5V or 3.3V) with eight selectable clock frequencies.
鈥?Ten 3.3V synchronous PCI clock outputs
鈥?Two 3.3V USB/IR clocks at 48 MHz
鈥?One Keyboard clock at 8 MHz
鈥?One 2.5V IOAPIC clock at 14.318 MHz
鈥?Two 3.3V Ref. clocks at 14.318 MHz
鈥?Dedicated power management for portable systems
鈥?Separate output enable pins for CPU, PCI, and
USB/IR clock sets
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?Free-running PCI and CPU clocks (see options)
Factory-EPROM programmable output drive and slew
rate for EMI customization
Custom configuration with factory-EPROM program-
mable CPU, PCI, and USB/IR frequencies.
Low skew and low jitter outputs
Available in space-saving 48-pin TSSOP package
voltage applied on pin 42. There are ten PCI clocks, running
at one half the CPU clock frequency. Free-running PCI and
CPU clocks are available as options shown in the selector
guide. Additionally, the part outputs two 3.3V USB/IR clocks at
48 MHz, one Keyboard clock at 8 MHz, one 2.5V IOAPIC clock
at 14.318 MHz, and two 3.3V reference clocks at 14.318 MHz.
The CY2278 family contains several features for output flexi-
bility and power control. The CPU, PCI, USB and IR clock
frequencies are all factory EPROM-programmable. Three
hardware select inputs support eight CPU clock frequencies
from 20鈥?5 MHz. Additionally, each of the CPU, PCI, and
USB/IR clock sets can be turned on or off with a dedicated
enable input pin for power management.
The CY2278A outputs are designed for low EMI emissions.
Controlled rise and fall times, unique output driver circuits and
factory-EPROM programmable output drive and slew-rate en-
able optimal configurations for EMI control.
CY2278A Selector Guide
Clock Outputs
CPU@3.3V
CPU@2.5/3.3V
PCI (CPU/2 MHz)
USB/IR (48 MHz)
KB (8 MHz)
IOAPIC (14.318 MHz)
Ref (14.318 MHz)
CPU-PCI delay
Notes:
1. One free-running CPU clock.
2. Two free-running PCI clocks.
-1L
3
4
[1]
-2L
3
4
10
2
1
2
2
0 ns
-3L
3
4
10
[2]
2
1
2
2
1鈥? ns
-4L
3
4
10
[2]
2
1
2
2
0 ns
10
[2]
2
1
2
2
0 ns
Functional Description
The CY2278A is a Clock Synthesizer/Driver chip for Pentium
or Pentium II portable PCs designed with the 82430TX or sim-
ilar core-logic chipsets. There are four options available as
shown in the selector guide.
The CY2278A outputs seven CPU clocks, three of which run
at 3.3V and four run at either 2.5V or 3.3V, depending on the
Logic Block Diagram
14.318 MHz
2.5鈥?.3V Driver
IOAPIC
REF[0-1]
48 MHz
D
CK
/12
8 MHZ
X
IN
X
OUT
OSC.
96 MHz
PLL0
D
CK
/2
USB_RUN
USBCLK/IRCLK
CLK8MHz
2.5鈥?.3V Driver
XCPUCLK [0-2]
XCPUCLK3_F
on -1L only; not free-
running on -2L, -3L, -4L
CPUCLK [0-2]
SEL2
SEL1
SEL0
EPROM
CPUCLK
PLL1
CPU_RUN
D
CK
/2
D
CK
PCICLK
PCICLK [2-9]
PCICLK_F [0-1]
on -1L, -3L, -4L only; not free-
running on -2L
PCI_RUN
D
CK
D
CK
Intel and Pentium are registered trademarks of Intel Corporation.
Cypress Semiconductor Corporation
Document #: 38-07211 Rev. *A
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134 鈥?408-943-2600
Revised Decemeber 07, 2002

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