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PDF W48C54A Data sheet ( Hoja de datos )
| Número de pieza | W48C54A | |
| Descripción | Frequency Synthesizers | |
| Fabricantes | Cypress Semiconductor | |
| Logotipo |  |
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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. **
1 page  
W48C54A/55A
5.0V AC Characteristics (0°C < TA < 70°C, VDD = 5.0V ±10%)
Parameter
Description
Conditions
TICR
TICF
TR
TR
TF
TF
DT
TJAB
FI
TSK
Input Clock Rise Time
Input Clock Fall Time
Output Rise Time, 0.8 to 2.0V
Rise Time, 20% to 80% VDD
Output Fall Time, 2.0 to 0.8V
Fall Time, 80% to 20% VDD
Duty Cycle, All Outputs
Jitter, Absolute
Input Frequency
Clock Skew between CPU and
2XCPU outputs
25-pF load
25-pF load
25-pF load
25-pF load
25-pF load
16–100 MHz clocks
TFT
Frequency Transition Time
From 8–100 MHz
Min
40/60
Typ
1
2
1
2
50/50
14.318
40
Max
20
20
2
4
2
4
60/40
700
1.0
50
Unit
ns
ns
ns
ns
ns
ns
%
ps
MHz
ns
ms
3.3V DC Characteristics (0°C < TA < 70°C, VDD = 3.3V±10%)
Parameter
Description
Test Condition
VIL Input Low Voltage
VDD = 3.3V
VIH Input High Voltage
VDD = 3.3V
IIL
Input Low Current[2]
VIN = 0V
IIH Input High Current
VIN = VDD
VOL Output Low Voltage
IOL = 4 mA
VOH Output High Voltage
IOH = –4 mA, VDD=3.3V
IDD Supply Current[3]
No load
FD Output Frequency Change[4] Over supply and temperature
ISC
Short Circuit Current
Each output clock
CIN Input Capacitance
Except pins X1, X2
CL Load Capacitance
Pins X1 and X2
RP
Pull-up Resistor Value
Except X1, X2
Min
0.7*VDD
2.4
25
Typ
20
0.002
40
20
250
3.3V AC Characteristics (0°C < TA < 70°C, VDD = 3.3V ±10%)
Parameter
Description
Conditions
TICR
TICF
TR
TF
DT
TJAB
FI
TSK
Input Clock Rise Time
Input Clock Fall Time
Rise Time, 20% to 80% VDD
Fall Time, 80% to 20% VDD
Duty Cycle, All Outputs
Jitter, Absolute
Input Frequency
Clock Skew between CPU and
2XCPU outputs
15-pF load
15-pF load
15-pF load
16–80 MHz clocks
TFT
Frequency Transition Time
From 8–100 MHz
Min
40/60
Typ
2
2
50/50
14.318
40
Max
0.15*VDD
–100
10
0.4
35
0.01
10
Unit
V
V
µA
µA
V
V
mA
%
mA
pF
pF
kΩ
Max
20
20
4
4
60/40
700
1.0
50
Unit
ns
ns
ns
ns
%
ps
MHz
ns
ms
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet W48C54A.PDF ] | |
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