pi6c185-01 Pericom Semiconductor Corporation, pi6c185-01 Datasheet - Page 5

• Manufacturer Part Number: pi6c185-01
• Description: 3.3v, 140mhz Mobile Pc 1 5 Output Clock Driver
• Manufacturer: Pericom Semiconductor Corporation

1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2
Minimum and Maximum Expected Capacitive Loads
Notes:
1. Maximum rise/fall times are guaranteed at maximum specified load.
2. Minimum rise/fall times are guaranteed at minimum specified load.
3. Rise/fall times are specified with pure capacitive load as shown.
Design Guidelines to Reduce EMI
1. Place R
2. Minimize the number of “vias” of the clock traces.
3. Route clock traces over a continuous ground plane or over a continuous power plane. Avoid routing
4. Position clock signals away from signals that go to any cables or any external connectors.
S
C
D
Testing is done with an additional 500 resistor in parallel.
value for CI is 10 pF. R
and fall time are still within the specified values.
clock traces from plane to plane (refer to rule #2).
o l
R
A
k c
M
S
M
series resistors and CI capacitors as close as possible to the respective clock pins. Typical
n i
0 2
L
o
d a
M
Waveform
x a
0 3
S
L
Series resistor value can be increased to reduce EMI provided that the rise
o
d a
Waveform
Clocking
Interface
Input
(TTL)
3.3V
Output
U
F p
n
s t i
S
2.4
1.5
0.4
D
R
A
t
plh
M
I D
t
SDRISE
M
Figure 1. Clock Waveforms
M
N
1.5V
t o
p S
s e
c e
tSDKH
Output
Buffer
c i f i
i t a
1.5V
n o
5
tSDKP
t
SDFALL
Test Load
tSDKL
Test
Point
1.5V
1.5V
t
Precision 1-5 Clock Buffer
phl
PS8318E
PI6C185-01
10/14/04
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