pi6c918 Pericom Semiconductor Corporation, pi6c918 Datasheet
pi6c918
Manufacturer Part Number
pi6c918
Description
3.3v Precision Clock Generator Semiconductor Corporation
Manufacturer
Pericom Semiconductor Corporation
Datasheet
1.PI6C918.pdf
(3 pages)
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
Features
• No external capacitors (919 only)
• Excellent signal quality
• Very low jitter
• Precise frequencies
• Minimal undershoot, ringback or overshoot
• Nearly perfect 50% duty cycle
• Four selectable clock frequencies
• Operates at Vcc = 3.3V
• Output may be disabled to save power
• Small 150-mil wide SOIC -8 (W8) package
Pin Configuration
Output CLK Frequency Selection
Notes:
1. Indicates popular target frequencies.
2. The ratio of N/M may be changed by mask option.
e S
S
saves board area
e l
, 1
0 0
1 0
0 1
1 1
i t c
S
n o
0
/ N
GND
M
2
4
5
7
OE
(
X1
X2
) 2
M
u (
C
H
0 4
0 5
0 7
i s
z
o l
–
g n
1
2
3
4
k c
t X
(
(
(
) 1
) 1
) 1
0 1
) l a
8-PIN
W8
u (
M
i s
H
3 3
6 6
C
g n
1
o l
z
3 8
3 .
6 .
6 1
t X
k c
6 1
(
(
) 1
) 1
) l a
8
7
6
5
6 .
M
u (
C
H
1
i s
0 8
Vcc
S1
S0
CLK
o l
z
0 4
0 0
g n
–
t X
k c
(
) 1
(
) 1
0 2
) l a
u (
M
i s
C
H
1
4 4
8 8
g n
0 1
z
o l
–
2 .
k c
t X
4 .
2 2
5 .
) l a
1 .
1
Description
The PI6C918 and PI6C919 are high-precision, low-voltage
general-purpose clock generators that reach a maximum output
frequency of 120 MHz. These devices use an external low-cost
crystal to generate very accurate and stable system clocks.
These frequency synthesizers include a crystal oscillator, a
programmable PLL and an output buffer. Any one of four
different output frequencies can be selected via two select pins
(S0, S1). The frequency multipliers are: 2, 4, 5, and 7.
The PI6C919 has on-chip capacitors, eliminating the need for
external capacitors at the X1, X2 pins. This reduces overall parts
count and board area, and increases reliability.
The OE (output enable) pin may be pulled down to disable the
output buffer and save system power.
The small surface-mount SOIC-8 package is ideal for compact
portable equipment applications.
Pin Description
Note:
1. I = Input, O = Output, C = Crystal
Product Speed Grades
Pin Name Pin # I/O Description
Part No.
PI6C918/919
PI6C918A/919A
PI6C918B/919B
CLK
X1
X2
OE
S0
S1
6
7
2
3
5
1
3.3V Precision Clock Generator
C
C
O
I
I
I
Output Freq.
Select 0, internal pull-up
Select 1, internal pull-up
Crystal or clock input, 8 to 23 MHz
Crystal connection or no connect
Clock output
OE = 1 Enable CLK output
OE = 0 Disable CLK output
Max CLK
100 MHz
120 MHz
80 MHz
PI6C918/919
Frequency
Max VCO
160 MHz
200 MHz
240 MHz
PS7038B
09/08/97
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pi6c918 Summary of contents
Page 1
... Indicates popular target frequencies. 2. The ratio of N/M may be changed by mask option. Description The PI6C918 and PI6C919 are high-precision, low-voltage general-purpose clock generators that reach a maximum output frequency of 120 MHz. These devices use an external low-cost crystal to generate very accurate and stable system clocks. ...
Page 2
... Typ. Max. Units — — — — — 20 MHz 10 — 24 — — PI6C918/919 PS7038B 09/08/97 ...
Page 3
... Pericom Semiconductor Corporation 3 PI6C918/919 3.3V Precision Clock Generator ( ) ...