V
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
1
2109876543212109876543210987654321098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI6C2402
Phase-Locked Loop Clock Driver
Product Features
•
2X CLK_IN on CLK_OUT
•
High-Performance Phase-Locked-Loop Clock Distribution
for Networking, ATM, 100/134 MHz Registered DIMM
Synchronous DRAM modules for server/workstation/
PC applications
•
Zero Input-to-Output delay
•
Low jitter: Cycle-to-Cycle jitter ±100ps max.
•
On-chip series damping resistor at clock output drivers
for low noise and EMI reduction
•
Operates at 3.3V V
CC
•
Wide range of Clock Frequencies
•
Package:
Plastic 8-pin SOIC Package (W)
Product Description
The PI6C2402 features a low-skew, low-jitter, phase-locked loop
(PLL) clock driver. By connecting the feedback CLK_OUT output
to the feedback FB_IN input, the propagation delay from the
CLK_IN input to any clock output will be nearly zero. The PI6C2402
provides 2X CLK_IN on CLK_OUT output.
Application
If the system designer needs more than 16 outputs with the features
just described, using two or more zero-delay buffers such as
PI6C2509Q, and PI6C2510Q, is likely to be impractical. The device-
to-device skew introduced can significantly reduce the perfor-
mance. Pericom recommends the use of a zero-delay buffer and an
eighteen output non-zero-delay buffer. As shown in
Figure 1, this combination produces a zero-delay buffer with all the
signal characteristics of the original zero-delay buffer, but with as
many outputs as the non-zero-delay buffer part. For example, when
combined with an eighteen output non-zero delay buffer, a system
designer can create a seventeen-output zero-delay buffer.
Logic Block Diagram
CLK_IN
FB_IN
S
2
PLL
CLK_OUT
Product Pin Configuration
CLK_IN
AV
CC
AGND
CLK_OUT
Feedback
1
2
3
4
8
FB_IN
V
CC
GND
S
8-Pin
W
7
6
5
Control Input
Zero Delay
Buffer
PI6C2402
CLK_OUT
18 Output
Non-Zero
Delay
Buffer
S
17
Output Source
PLL
CLK_IN
PLL Shutdown
N
Y
Reference
Clock
Signal
1
0
Figure 1. This Combination Provides Zero-Delay Between the
Reference Clocks Signal and 17 Outputs
1
PS8418B
05/21/01
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI6C2402
Phase-Locked Loop Clock Driver
Pin Functions
Pin Name
CLK _IN
AV
CC
AGND
CLK _O UT
S
GND
V
CC
FB_IN
Pin Numbe r
1
2
3
4
5
6
7
8
Type
I
Power
Ground
O
I
Ground
Power
I
Analog power.
Analog ground.
Clock output. The output provides low- skew copies of CLK _IN and
has an embedded series- damping resistor.
Control Input S. S is used to bypass the PLL for test purposes. When S is strapped to
ground, PLL is bypassed and CLK _IN is buffered directly to the device outputs.
Ground.
Power supply.
Feedback input. FB_IN provides the feedback signal to the internal PLL.
D e s cription
Reference Clock input. CLK _IN allows spread spectrum clock input
Absolute Maximum Ratings
(Over operating free-air temperature range, see Note 1)
Symbol
V
I
V
O
VI_DC
IO_DC
Power
T
STG
Input voltage range
Output voltage range
DC input voltage
DC output current
Maximum power dissipation at T
A
= 55
o
C in still air
Storage temperature
65
Parame te r
M in.
0.5
0.5
0.5
M ax.
V
CC
+ 0.5
V
CC
+ 0.5
+5.0
100
1.0
150
mA
W
o
Units
V
C
Note:
1. Stress beyond those listed under absolute maximum ratings may cause permanent damage to the device.
Recommended Operating Conditions
Symbol
V
CC
V
IH
V
IL
V
I
T
A
Parame te r
Supply voltage
Supply voltage
High level input voltage
Low level input voltage
Input voltage
O perating free- air temperature
O perating free- air temperature
Commercial
Industrial
0
0
40
Te mpe rature
Commercial
Industrial
M in.
3.0
3.135
2.0
0.8
V
CC
70
85
ºC
M ax.
3.6
3.465
V
Units
2
PS8418B
12/07/01
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI6C2402
Phase-Locked Loop Clock Driver
Electrical Characteristics
Symbol
I
CC
C
I
C
O
I
OH
I
OL
(Over recommended operating free-air temperature range)
Te s t Condition
V
I
= V
CC
or GND; I
O
= 0
(2)
V
I
= V
CC
or GND; I
O
=
V
I
= V
CC
or GND
V
O
= V
CC
or GND
V
OUT
= 2.4V
V
OUT
= 2.0V
V
OUT
= 0.8V
V
OUT
= 0.55V
0
(2)
Te mpe rature
Commercial
Industrial
V
CC
3.6V
3.465V
3.3V
M in.
Typ.
M ax.
10
10
Units
µA
pF
4
6
18
30
25
17
mA
Note:
2. Continuous Output Current
AC Specifications Timing Requirements
Symbol
F
CLOCK
D
CYI
t
p
tj
t
r
t
f
Parame te r
Clock frequency
Clock frequency
Input clock duty cycle
Stabilization time after power up
Phase error without jitter
(3)
Jitter, cycle- to- cycle
Duty cycle
Rise- time, 0.4V to 2.0V
Fall- time, 2.0V to 0.4V
(Over recommended ranges of supply voltage and operating free-air temperature, C
L
= 25pF)
Te s t Condition
Commercial
Industrial
M in.
25
25
40
Typ.
M ax.
134
100
60
1
+150
+100
55
Units
MHz
%
ms
ps
%
ns
CLK _IN
↑
at 100MHz and 66MHz
At 100MHz and 66MHz
150
100
45
1.0
1.1
Note:
3. This switching parameter is guaranteed by design.
3
PS8418B
12/07/01
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI6C2402
Phase-Locked Loop Clock Driver
8-pin Plastic SOIC (W) Package
8
.149
.157
3.78
3.99
.0099
.0196
0.25
x 45˚
0.50
1
.189
.196
.016
.026
0.406
0.660
REF
4.80
5.00
1.35
1.75
SEATING PLANE
0-8˚
.0075
.0098
0.40 .016
1.27 .050
0.19
0.25
.053
.068
.2284
.2440
5.80
6.20
.050
BSC
1.27
.013 0.330
.020 0.508
.0040 0.10
.0098 0.25
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
Ordering Information
Orde ring Code
PI6C2402W
PI6C2402- WI
Package Name
W8
W8
Package Type
8- pin 150- mil SOIC
8- pin 150- mil SOIC
Ope rating Range
Commercial
Industrial
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
4
PS8418B
12/07/01
