PCK2014A 데이터 시트보기 (PDF) - Philips Electronics

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PCK2014A

CK98 (100/133 MHz) spread spectrum system clock generator

Philips Electronics 

Philips Semiconductors

CK98 (100/133 MHz) spread spectrum

system clock generator

Product specification

PCK2014A

PIN DESCRIPTION

PIN NUMBER

SYMBOL

FUNCTION

2, 3

REF [0–1]

3.3 V 14.318 MHz clock output

5

XTAL_IN

14.318 MHz crystal input

6

XTAL_OUT

14.318 MHz crystal output

9, 11, 12, 14, 15, 18

PCI_[F, 1–5]

3.3 V PCI clock outputs, pin 9 is a free running PCI clock

25, 26

3V66 [0–1]

3.3 V fixed 66 MHz clock outputs

28

SEL133/100

Select input pin for enabling 133 MHz or 100 MHz CPU outputs.

H = 133 MHz, L = 100 MHz

30

48 MHz USB

3.3 V fixed 48 MHZ clock output

32, 33

SEL [0–1]

Logic select pins. TTL levels.

34

SPREAD

3.3 V LVTTL input. Enables spread spectrum mode when held LOW.

35

PWRDWN

3.3 V LVTTL input. Device enters powerdown mode when held LOW.

36

CPUSTOP

3.3 V LVTTL input. Stops all CPU clocks and 3V66 clocks when held LOW.

CPUDIV_2 output remains on all the time.

37

PCISTOP

3.3 V LVTTL input. Stops all PCI clocks except PCICLK_F when held LOW.

41, 42, 45, 46, 49, 50

CPUCLK [0–5] 2.5 V CPU output. 133 MHz or 100 MHz depending on state of input pin SEL133/100.

53, 54, 55

APIC [0–2]

2.5 V clock outputs running divide synchronous with the CPU clock frequency.

Fixed 16.67 MHz limit.

4, 10, 16, 17,

22, 23, 27, 31, 39

VDD3V

3.3 V power supply, pins 22 and 23 are analog VDD.

1, 7, 8, 13, 19, 20, 21, 24,

29, 38, 40, 44, 48, 52

VSS

Ground, pins 20 and 21 are analog VSS.

43, 47, 51, 56

VDD25V

2.5 V power supply

NOTE:

1. VDD3V, VDD25V and VSS in the above table reflects a likely internal POWER and GROUND partition to reduce the effects of internal noise on

the performance of the device. In reality, the platform will be configured with the VDD25V pins tied to a 2.5 V supply, all remaining VDD pins

tied to a common 3.3 V supply and all VSS pins being common.

2. Pins 20 and 21 are analog ground and should be tied to a ground plane. Pins 22 and 23 are analog VDD should be properly decoupled

to a 3.3 V supply. These analog power supply pins should not be tied to the PCI power and ground to avoid noise coupling into the

analog power supply pins. The PCK2014 provides separate power supplies for the internal digital circuitry (pin 39, VCC) and the internal

PLLs of the device (pins 22 and 23, VCC). The purpose of this approach is to try and isolate the high switching noise digital outputs from

relatively sensitive analog blocks. In controlled environments such as a test board this level is very well controlled. However, in a mixed

signal environment, a second level of isolation may be required.

2001 Apr 02

3

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