pi6c182 Pericom Semiconductor Corporation, pi6c182 Datasheet - Page 5

• Manufacturer Part Number: pi6c182
• Description: 3.3v, 110mhz Mobile Pc 1 10 Output Clock Driver
• Manufacturer: Pericom Semiconductor Corporation

Minimum and Maximum Expected
Capacitive Loads
Notes:
1.
2.
3.
SDRAM
Clock
Maximum rise/fall times are guaranteed at maximum specified
load.
Minimum rise/fall times are guaranteed at minimum specified
load.
Rise/fall times are specified with pure capacitive load as shown.
Testing is done with an additional 500Ω resistor in parallel.
06-0256
Min.
20
Max.
30
Waveform
Interface
Clocking
Input
Waveform
(TTL)
3.3V
Units
Output
pF
2.4
1.5
0.4
SDRAM DIMM
Specificaion
t plh
(1,2,3)
t SDRISE
Notes
Figure 1. Clock Waveforms
1.5V
tSDKH
Output
Buffer
1.5V
5
Design Guidelines to Reduce EMI
1. Place series resistors and CI capacitors as close as possible to
2. Minimize the number of “vias” of the clock traces.
3. Route clock traces over a continuous ground plane or over
4. Position clock signals away from signals that go to any cables
t SDFALL
tSDKP
the respective clock pins. Typical value for CI is 10pF. Series
resistor value can be increased to reduce EMI provided that
the rise and fall time are still within the specified values.
a continuous power plane. Avoid routing clock traces from
plane to plane (refer to rule #2).
or any external connectors.
Test Load
tSDKL
Test
Point
1.5V
1.5V
Precision 1-to-10 Clock Buffer
t phl
PI6C182, PI6C182A
PS8165F
01/25/06