pi6c185-00 Pericom Semiconductor Corporation, pi6c185-00 Datasheet - Page 5

• Manufacturer Part Number: pi6c185-00
• Description: 3.3v, 125mhz Mobile Pc 1 7 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 series 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 clock
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-ohm resistor in parallel.
for CI is 10pF. R
are still within the specified values.
traces from plane to plane (refer to rule #2).
o l
R
A
k c
M
M
. n i
0 2
S
L
resistors and CI capacitors as close as possible to the respective clock pins. Typical value
a o
S
Series resistor value can be increased to reduce EMI provided that the rise and fall time
Waveform
d
M
a
Waveform
Interface
Clocking
Input
. x
0 3
(TTL)
L
Output
3.3V
a o
d
2.4
1.5
0.4
U
p
n
F
s t i
t
plh
t
S
SDRISE
D
S
1.5V
R
e p
A
Figure 1. Clock Waveforms
N
i c
M
t o
c i f
tSDKH
Output
Buffer
s e
I D
i t a
1.5V
n o
M
M
tSDKP
t
5
SDFALL
Test Load
tSDKL
Test
Point
1.5V
1.5V
t
phl
Precision 1-7 Clock Buffer
PS8317E
PI6C185-00
12/06/04