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Cypress Semiconductor Electronic Components Datasheet

W48C54A Datasheet

Frequency Synthesizers

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A
W48C54A/55A
Frequency Synthesizers
Features
• Proprietary crystal oscillator circuitry provides low
REFOUT jitter, excellent duty cycle
• Power-on delay feature ensures full VDD is reached prior
to output activation
• 3.3V and 5V operation supported including the VRE
(Voltage Regulated Extended) specification for
Pentium® processor
• Pin and function compatible with AV9154/AV9155
• Integral PLL loop filter components ensures stable PLL
operation in noisy system environment
Block Diagram
• Smooth frequency transition of CPU and 2XCPU
outputs
• Compatible with Intel X86 and other high-performance
processors
• Up to eight outputs for CPU and peripherals
• Supports Green PC and notebook designs
• Custom options available with metal layer change
• High-performance, low-power CMOS
• Available in 16- (150-mil) and 20-pin SOIC package
(300-mil)
Pin Configurations
14.318 MHz
Xtal X1
X2
VDD
XTAL
OSC
PD
PLL1
14.318 MHz
Fixed
Outputs
NC 1 16 NC
X2 2 15 47.059MHz
X1 3 14 NC
VDD 4 13 VDD
GND 5 12 GND
NC 6 11 REF(20MHz)
32MHz 7 10 NC
GND
8
9 OE
FS2:0
PLL2
2XCPU
CPU
GND
OE
FS0 1 16 FS1
X2 2 15 CPU
X1 3 14 NC
VDD 4 13 VDD
GND 5 12 GND
40MHz 6 11 REF(20MHz)
32MHz 7 10 NC
GND
8
9 OE
1.843MHz 1 16 FS1
X2 2 15 FS0
X1 3 14 CPU
VDD 4 13 VDD
GND 5 12 GND
24MHz 6 11 14.318MHz
12MHz 7 10 PD
GND
8
9 OE
Intel and Pentium are registered trademarks of Intel Corporation.
1.843MHz
X2
X1
VDD
GND
16MHz
24MHz
12MHz
GND
0E
1
2
3
4
5
6
7
8
9
10
20 FS0
19 FS1
18 CPUCLK
17 2XCPUCLK
16 VDD
15 GND
14 14.318MHz
13 14.318MHz
12 PD
11 FS2
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
September 28 1999, rev. **


Cypress Semiconductor Electronic Components Datasheet

W48C54A Datasheet

Frequency Synthesizers

No Preview Available !

W48C54A/55A
Pin Definitions
Pin Name
1.843MHz
12MHz
16MHz
REF
24MHz
32MHz
40MHz
47.059MHz
2XCPU
CPU
NC
OE
PD
FS0
FS1
FS2
VDD
GND
X1
X2
Pin
Type
O
O
O
O
O
O
O
O
O
O
I
Pin #
-05, -09
N/A
N/A
N/A
11
N/A
7
6
N/A
N/A
15
10, 14
9
Pin #
-08
N/A
N/A
N/A
11
N/A
7
N/A
15
N/A
N/A
1, 6, 10,
14, 16
9
Pin #
-59
1
7
N/A
11
6
N/A
N/A
N/A
N/A
14
N/A
9
I N/A N/A
10
I 1 N/A 15
I 16 N/A 16
I N/A N/A N/A
P 4, 13 4, 13 4, 13
G 5, 8, 12 5, 8, 12 5, 8, 12
I3 3 3
O2 2 2
Pin #
-61
1
8
6
13, 14
7
N/A
N/A
N/A
17
18
N/A
Pin Description
Fixed 1.843-MHz output for serial I/O clock application
Fixed 12-MHz output for keyboard clock application
Fixed 16-MHz output for APIC or bus clock application
Fixed Reference output.
Fixed 24-MHz output for floppy drive or super I/O application
Fixed 32-MHz output for ISA or PCI bus clock application
Fixed 40-MHz output for SCSI clock application
Fixed 47.059-MHz output
2X Clock Output (refer to Frequency Selection table)
Clock Output (refer to Frequency Selection table)
No Connect
10 Output Enable, puts all outputs in high-impedance state
when LOW
12 Power Down input, puts device in power-down mode when
LOW
20 Frequency Selection input, LSB
19 Frequency Selection input
11 Frequency Selection input
4, 16 Power supply connection
5, 9, 15 Ground connection
3 Crystal connection or external clock frequency input
2 Crystal connection, leave unconnected when driving X1 with
external clock
2


Part Number W48C54A
Description Frequency Synthesizers
Maker Cypress Semiconductor
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