Philips Semiconductors
Product specification
14.318–150 MHz I
2
C 1:18 Clock Buffer
PCK2001
FEATURES
•
HIGH speed, LOW noise non-inverting 1–18 buffer
•
Typically used to support four SDRAM DIMMs
•
Multiple V
DD
, V
SS
pins for noise reduction
•
3.3V operation
•
Separate 3-State pin for testing
•
ESD protection exceeds 2000V per Standard 801.2
•
Optimized for 66MHz, 100MHz and 133MHz operation
•
175 ps skew outputs
•
Available in 48-pin SSOP package
•
See PCK2001M for mobile (reduced pincount) 28-pin 1-10 buffer
version
•
Individual clock output enable/disable via I
2
C
DESCRIPTION
The PCK2001 is a 1–18 fanout buffer used for 133/100 MHz CPU,
66/33 MHz PCI, 14.318 MHz REF, or 133/100/66 MHz SDRAM
clock distribution. 18 outputs are typically used to support up to 4
SDRAM DIMMS commonly found in desktop, workstation or server
applications.
All clock outputs meet Intel’s drive, rise/fall time, accuracy, and skew
requirements. An I
2
C interface is included to allow each output to be
enabled/disabled individually. An output disabled via the I
2
C
interface will be held in the LOW state. In addition, there is an OE
input which 3-States all outputs.
QUICK REFERENCE DATA
SYMBOL
t
PLH
t
PHL
t
r
t
f
I
CC
PARAMETER
Propagation delay
BUF_IN to BUF_OUT
n
Rise time
Fall time
Total supply current
CONDITIONS
V
CC
= 3.3V, CL = 30pF
V
CC
= 3.3V, CL = 30pF
V
CC
= 3.3V, CL = 20pF
V
CC
= 3.465V
TYPICAL
2.5
2.5
1.0
700
50
UNIT
ns
ns
ps
µA
ORDERING INFORMATION
PACKAGES
48-Pin Plastic SSOP
TEMPERATURE RANGE
0°C to +70°C
ORDER CODE
PCK2001 DL
DRAWING NUMBER
SOT370-1
PIN CONFIGURATION
V
DD0
1
RESERVED 2
RESERVED 3
BUF_OUT0 4
BUF_OUT1 5
V
SS0
6
V
DD1
7
BUF_OUT2 8
BUF_OUT3 9
V
SS1
10
V
DD2
12
BUF_OUT4 13
BUF_OUT5 14
V
SS2
15
V
DD3
16
BUF_OUT6 17
BUF_OUT7 18
V
SS3
19
V
DD4
20
BUF_OUT16 21
V
SS4
22
V
DDI2C
23
SDA 24
48 RESERVED
47 RESERVED
46 V
DD9
45 BUF_OUT15
44 BUF_OUT14
43 V
SS9
42 V
DD8
41 BUF_OUT13
40 BUF_OUT12
39 V
SS8
38 OE
PIN DESCRIPTION
PIN
NUMBER
4, 5, 8, 9
13, 14, 17,
18
31, 32, 35,
36
40, 41, 44,
45
21, 28
11
38
24
25
3, 7, 12, 16,
20, 29, 33,
37, 42, 46
6, 10, 15,
19, 22,
27, 30, 34,
39, 43
23
26
I/O
TYPE
Output
Output
Output
Output
Output
Input
Input
I/O
Input
Input
SYMBOL
BUF_OUT (0–3)
BUF_OUT (4–7)
BUF_OUT
(8–11)
BUF_OUT
(12–15)
BUF_OUT
(16–17)
BUF_IN
OE
SDA
SCL
V
DD (0–9)
FUNCTION
Buffered clock outputs
Buffered clock outputs
Buffered clock outputs
Buffered clock outputs
Buffered clock outputs
Buffered clock input
Active high output
enable
I
2
C serial data
I
2
C serial clock
3.3V Power supply
PCK2001
BUF_IN 11
37 V
DD7
36 BUF_OUT11
35 BUF_OUT10
34 V
SS7
33 V
DD6
32 BUF_OUT9
31 BUF_OUT8
30 V
SS6
29 V
DD5
28 BUF_OUT17
27 V
SS5
26 V
SSI2C
25 SCL
Input
V
SS (0–9)
Ground
3.3V I
2
C Power
supply
I
2
C Ground
SW00248
Input
Input
V
DDI2C
V
SSI2C
I
2
C is a trademark of Philips Semiconductors Corporation.
1999 Jul 06
2
853-2072 21924
Philips Semiconductors
Product specification
14.318–150 MHz I
2
C 1:18 Clock Buffer
PCK2001
FUNCTION TABLE
OE
L
H
H
H
BUF_IN
X
L
H
H
I
2
CEN
X
X
H
L
BUF_OUTn
Z
L
H
L
ABSOLUTE MAXIMUM RATINGS
1, 2
In accordance with the Absolute Maximum Rating System (IEC 134)
Voltages are referenced to V
SS
(V
SS
= 0V)
SYMBOL
V
DD
I
IK
V
I
I
OK
V
O
I
O
T
STG
P
TOT
PARAMETER
DC 3.3V supply voltage
DC input diode current
DC input voltage
DC output diode current
DC output voltage
DC output source or sink current
Storage temperature range
Power dissipation per package
plastic medium-shrink SO (SSOP)
For temperature range: 0 to +70°C
above +55°C derate linearly with 11.3mW/K
V
I
< 0
Note 2
V
O
> V
DD
or V
O
< 0
Note 2
V
O
>= 0 to V
DD
–65
–0.5
–0.5
CONDITION
LIMITS
MIN
–0.5
MAX
+4.6
–50
5.5
±50
V
CC
+ 0.5
±50
+150
850
UNIT
V
mA
V
mA
V
mA
°C
mW
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
DD
C
L
V
I
V
O
T
amb
PARAMETER
DC 3.3V supply voltage
Capacitive load
DC input voltage range
DC output voltage range
Operating ambient temperature range in free air
CONDITIONS
LIMITS
MIN
3.135
20
0
0
0
MAX
3.465
30
V
DD
V
DD
+70
UNIT
V
pF
V
V
°C
1999 Jul 06
3
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