PCK2000DL Просмотр технического описания (PDF) - Philips Electronics
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PCK2000DL Datasheet PDF : 14 Pages
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Philips Semiconductors
CK97 (66/100MHz) System Clock Generator
Product specification
PCK2000
AC WAVEFORMS
VM = 1.25V @ VDDQ2 and 1.5V @ VDDQ3
VX = VOL + 0.3V
VY = VOH –0.3V
VOL and VOH are the typical output voltage drop that occur with the
output load.
CPUCLK
1.25V
VDDQ2
VSS
CPUCLK
1.25V
VDDQ2
VSS
THSKW
SW00240
Figure 1. CPUCLK to CPUCLK skew
CPUCLK
1.25V
VDDQ2
VSS
PCICLK
1.5V
VDDQ3
VSS
THPOFFSET
SW00241
Figure 2. CPUCLK to PCICLK offset
2.0
2.5V CLOCKING 1.25
INTERFACE
0.4
THKP
DUTY CYCLE
THKH
TRISE
TFALL
THKL
2.4
3.3V CLOCKING
INTERFACE
1.5
(TTL)
0.4
TPKH
TPKP
TRISE
TFALL
TPKL
SW00242
Figure 3. 2.5V/3.3V Clock waveforms
VI
SEL 100, 66,
VM
SEL1, SEL0
GND
VDD
OUTPUT
LOW-to-OFF
OFF-to-LOW
VOL
tPLZ
VX
tPZL
VM
VOH
OUTPUT
HIGH-to-OFF
OFF-to-HIGH
VSS
tPHZ
outputs
enabled
tPZH
VY
outputs
disabled
VM
outputs
enabled
SW00239
Figure 4. 3-State enable and disable times.
COMPONENT
MEASUREMENT
POINTS
2.5VOLT MEASURE POINTS
VOH = 2.0V
VDDQ2
VIH = 1.7V
1.25V
VOL = 0.4V
VIL = 0.7V
VSS
COMPONENT
MEASUREMENT
POINTS
3.3VOLT MEASURE POINTS
VOH = 2.4V
VOL = 0.4V
VDDQ3
VIH = 2.0V
1.5V
VIL = 0.7V
VSS
SYSTEM
MEASUREMENT
POINTS
SYSTEM
MEASUREMENT
POINTS
SW00243
Figure 5. Component versus system measure points
1998 Sep 29
10
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