PLL102-108
Programmable DDR Zero Delay Clock Driver
FEATURES
PIN CONFIGURATION
·
·
PLL clock distribution optimized for Double Data
GND
CLKC0
CLKT0
VDD
1
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
GND
Rate SDRAM application up to 266Mhz.
Distributes one clock Input to one bank of ten
differential outputs.
2
CLKC5
CLKT5
VDD
3
4
CLKT1
CLKC1
GND
5
CLKT6
CLKC6
GND
·
·
Track spread spectrum clocking for EMI reduction.
Programmable delay between CLK_INT and
CLK[T/C] from –0.8ns to +3.1ns by programming
CLKINT and FBOUT skew channel, or from –1.1ns to
+3.5ns if additional DDR skew channels are enabled.
Four independent programmable DDR skew chan-
nels from –0.3ns to +0.4ns with step size ±100ps.
Support 2-wire I2C serial bus interface.
2.5V Operating Voltage.
6
7
GND
8
GND
CLKC2
CLKT2
VDD
9
CLKC7
CLKT7
VDD
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
SCLK
CLK_INT
N/C
SDATA
N/C
·
FB_INT
VDD
VDD
AVDD
AGND
GND
FB_OUTT
N/C
·
·
·
GND
Available in 48-Pin 300mil SSOP.
CLKC3
CLKT3
VDD
CLKC8
CLKT8
VDD
DESCRIPTIONS
CLKT4
CLKC4
GND
CLKT9
CLKC9
GND
The PLL102-108 is a zero delay buffer that distributes
a single-ended clock input to ten pairs of differential
clock outputs and one feedback clock output. Output
signal duty cycles are adjusted to 50%, independent of
the duty cycle at CLK_INT. The PLL can be bypassed
for test purposes by strapping AVdd to ground.
BLOCK DIAGRAM
Programmable
Skew Channel
Control
Logic
-600~+800ps
±200ps step
AVDD
FB_OUTT
CLKT0
CLKC0
CLKT1
CLKC1
CLKT5
CLKC5
CLKT2
CLKC2
CLKT3
CLKC3
CLKT4
CLKC4
CLKT7
CLKC7
CLKT8
CLKC8
CLKT9
CLKC9
Programmable
Delay Channel
-300~+400ps
±100ps step
(0~2.5ns)
+170ps step
CLK_INT
PLL
-300~+400ps
±100ps step
FB_INT
AVDD
-300~+400ps
±100ps step
-300~+400ps
±100ps step
CLKT6
CLKC6
47745 Fremont Blvd., Fremont, California 94538 TEL (510) 492-0990 FAX (510) 492-0991
Rev 03/29/02 Page 1