ICS8305I Datasheet, PDF (12/16 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-4, MULTIPLEXED DIFFERENTIAL/LVCMOS-TO-LVCMOS/LVTTL FANOUT BUFFER

ICS8305I
LOW SKEW, 1-TO-4, MULTIPLEXED DIFFERENTIAL/
LVCMOS-TO-LVCMOS/LVTTL FANOUT BUFFER
SCHEMATIC EXAMPLE
This application note provides general design guide using
ICS8305I LVCMOS buffer. Figure 4 shows a schematic example
of the ICS8305I LVCMOS clock buffer. In this example, the input
is driven by an LVCMOS driver. CLK_EN is set at logic low to
select LVCMOS_CLK input.
VDD
VDD
R4
R5
1K
1K
Ro ~ 7 Ohm
Zo = 50
R3
43
3,.3V LVCMOS
VDD
R1
43
U1
1
2
3
GND
OE
Q0
VDDO
16
15
14
4
5
6
VDD
CLK_EN
CLK
Q1
GND
Q2
13
12
11
R2
7
8
nCLK
CLK_SEL
LVCMOS_CLK
VDDO
Q3
GND
10
9
43
R6
ICS8305
1K
(U1,3)
(U1,11)
VDD
(U1,15)
VD D =3 .3 V
C1
0.1u
C2
0.1u
C3
0.1u
Zo = 50
Zo = 50
LVCMOS Receiv er
LVCMOS Receiv er
FIGURE 4. EXAMPLE ICS8305I LVCMOS CLOCK OUTPUT BUFFER SCHEMATIC
RELIABILITY INFORMATION
TABLE 6. θ_JAVS. AIR FLOW TABLE FOR 16 LEAD TSSOP
θ_JA by Velocity (Linear Feet per Minute)
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
0
137.1°C/W
89.0°C/W
200
118.2°C/W
81.8°C/W
500
106.8°C/W
78.1°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TRANSISTOR COUNT
The transistor count for ICS8305I is: 459
8305AGI
www.idt.com
12
REV. B SEPTEMBER 17, 2012