ICS93V855
Integrated
Circuit
Systems, Inc.
DDR Phase Lock Loop Clock Driver
Recommended Application:
Pin Configuration
DDR Clock Driver
GND
DDRC0
DDRT0
VDD2.5
CLK_INT
CLK_INC
AVDD2.5
AGND
1
2
3
4
5
6
7
8
9
28 DDRC4
27 DDRT4
26 VDD2.5
25 GND
24 FB_OUTC
23 FB_OUTT
22 VDD2.5
21 FB_INT
20 FB_INC
19 GND
Product Description/Features:
•
•
Low skew, low jitter PLL clock driver
External feedback pins for input to output
synchronization
•
•
•
Spread Spectrum tolerant inputs
With bypass mode mux
Operating frequency 60 to 170 MHz
GND
DDRC1 10
DDRT1 11
VDD2.5 12
DDRT2 13
DDRC2 14
18 VDD2.5
17 DDRT3
16 DDRC3
15 GND
Switching Characteristics:
•
•
CYCLE - CYCLE jitter:<75ps
OUTPUT - OUTPUT skew: <60ps
•
Output Rise and Fall Time: 650ps - 950ps
28-Pin 4.4mm TSSOP
Block Diagram
Functionality
INPUTS
OUTPUTS
PLL State
AVDD CLK_INT CLK_INC DDRT DDRC FB_OUTT FB_OUTC
GND
GND
L
H
L
L
H
L
L
H
L
Bypassed/Off
Bypassed/Off
FB_OUTT
FB_OUTC
H
H
H
2.5V
(nom)
DDRT0
DDRC0
L
H
L
L
H
L
L
H
H
L
On
On
Off
2.5V
(nom)
H
H
DDRT1
DDRC1
2.5V
(nom)
<20 MHz <20 MHz Hi-Z
Hi-Z
Hi-Z
Hi-Z
DDRT2
DDRC2
Control
Logic
DDRT3
DDRC3
DDRT4
DDRC4
FB_INT
FB_INC
PLL
CLK_INC
CLK_INT
AVDD2.5
0497B—06/01/04