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CDC925DL датащи(PDF) 2 Page - Texas Instruments

номер детали CDC925DL
подробное описание детали  133MHz CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS
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CDC925DL датащи(HTML) 2 Page - Texas Instruments

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CDC925
133-MHz CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS
WITH 3-STATE OUTPUTS
SCAS633 – JULY 28, 1999
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
Since the CDC925 is based on PLL circuitry, it requires a stabilization time to achieve phase lock of the PLL.
This stabilization time is required after power up or after changes to the SEL inputs are made. With use of an
external reference clock, this signal must be fixed-frequency and fixed-phase before the stabilization time starts.
function tables
SELECT FUNCTIONS
INPUTS
OUTPUTS
SEL133/
100
SEL1
SEL0
CPU
CPU_DIV2
3V66
PCI,
PCI_F
48MHz
REF
APIC
FUNCTION
L
L
L
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
3-state
L
L
H
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Reserved
L
H
L
100 MHz
50 MHz
66 MHz
33 MHz
Hi-Z
14.318 MHz
16.67 MHz
48-MHz PLL off
L
H
H
100 MHz
50 MHz
66 MHz
33 MHz
48 MHz
14.318 MHz
16.67 MHz
48-MHz PLL on
H
L
L
TCLK/2
TCLK/4
TCLK/4
TCLK/8
TCLK/2
TCLK
TCLK/16
Test
H
L
H
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Reserved
H
H
L
133 MHz
66 MHz
66 MHz
33 MHz
Hi-Z
14.318 MHz
16.67 MHz
48-MHz PLL off
H
H
H
133 MHz
66 MHz
66 MHz
33 MHz
48 MHz
14.318 MHz
16.67 MHz
48-MHz PLL on
ENABLE FUNCTIONS
INPUTS
OUTPUTS
INTERNAL
CPU_STOP
PWR_DWN
PCI_STOP
CPU
CPU_DIV2
APIC
3V66
PCI
PCI_F
REF,
48MHz
Crystal
VCOs
X
L
X
L
L
L
L
L
L
L
Off
Off
L
HL
L
On
On
L
L
On
On
On
On
L
HH
L
On
On
L
On
On
On
On
On
H
HL
On
On
On
On
L
On
On
On
On
H
H
H
On
On
On
On
On
On
On
On
On
OUTPUT BUFFER SPECIFICATIONS
BUFFER NAME
VDD RANGE
(V)
IMPEDANCE
(
Ω)
BUFFER TYPE
CPU, CPU_DIV2, APIC
2.375 – 2.625
13.5 – 45
TYPE 1
48MHz, REF
3.135 – 3.465
20 – 60
TYPE 3
PCI, PCI_F, 3V66
3.135 – 3.465
12 – 55
TYPE 5


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