ICS8308I Datasheet, PDF (1/16 Pages) Integrated Circuit Systems – Low Skew, 1-To-8 Differential/LVCOMS-TO-LVCMOS Fanout Buffer

LOW SKEW, 1-TO-8 DIFFERENTIAL/
LVCMOS-TO-LVCMOS FANOUT BUFFER
GENERAL DESCRIPTION
The ICS8308I is a low-skew, 1-to-8 Fanout Buffer
and a member of the HiPerClockS™family of High
Perfor mance Clock Solutions from IDT. The
ICS8308I has two selectable clock inputs. The CLK,
nCLK pair can accept most differential input levels.
The LVCMOS_CLK can accept LVCMOS or LVTTL input levels.
The low impedance LVCMOS/LVTTL outputs are designed to
drive 50Ω series or parallel terminated transmission lines. The
effective fanout can be increased from 8 to 16 by utilizing the
ability of the outputs to drive two series terminated trans-
mission lines.
The ICS8308I is characterized for 3.3V core/3.3V output,
3.3V core/2.5V output or 2.5V core/2.5V output operation.
Guaranteed output and part-part skew characteristics make
the 8308I ideal for those clock distribution applications requiring
well defined performance and repeatability.
ICS8308I
FEATURES
• Eight LVCMOS/LVTTL outputs, (7Ω typical output impedance)
• Selectable LVCMOS_CLK or differential CLK, nCLK inputs
• CLK, nCLK pair can accept the following differential
input levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL
• Maximum Output Frequency: 350MHz
• Output Skew: (3.3V± 5%): 100ps (maximum)
• Part to Part Skew: (3.3V± 5%): 1ns (maximum)
• Supply Voltage Modes:
(Core/Output)
3.3V/3.3V
3.3V/2.5V
2.5V/2.5V
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
BLOCK DIAGRAM
CLK_EN ^Pullup
LVCMOS_CLK ^Pullup
1
CLK ^Pullup
nCLK ^Pulldown
0
CLK_SEL ^Pullup
D
Q
LE
OE ^Pullup
IDT^™ / ICS^™ LVCMOS FANOUT BUFFER
PIN ASSIGNMENT
Q0 1
GND 2
24 VDDO
23 Q2
CLK_SEL 3
22 GND
LVCMOS_CLK 4
21 Q3
Q0
CLK 5
20 VDDO
nCLK 6
19 Q4
Q1
CLK_EN 7
18 GND
OE 8
17 Q5
Q2
VDD 9
16 VDDO
GND 10 15 Q6
Q3
Q1 11 14 GND
VDDO 12
13 Q7
Q4
ICS8308I
Q5
24-Lead, 173-MIL TSSOP
Q6
4.4mm x 7.8mm x 0.925mm body package
G Package
Q7
Top View
1
ICS8308AGI REV. B OCTOBER 16, 2007