ics83905 Integrated Device Technology, ics83905 Datasheet - Page 13

• Manufacturer Part Number: ics83905
• Description: Low Skew, 1 6 Crystal-to- Lvcmos/lvttl Fanout Buffer
• Manufacturer: Integrated Device Technology

L
Figure 5 shows an example of ICS83905 application schematic.
In this example, the device is operated at V
3.3V. The decoupling capacitors should be located as close as
possible to the power pins. The input is driven by an 18pF load
resonant quartz crystal. The tuning capacitors (C1, C2) are fairly
IDT
AYOUT
ICS83905
LOW SKEW, 1:6 CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER
™
/ ICS
VDDO
™
G
C2
15pf
LVCMOS/LVTTL FANOUT BUFFER
UIDELINE
ENABLE 2
1
2
3
4
5
6
7
8
U1
ICS83905
VDD
XTAL_OUT
ENABLE 2
GND
BCLK0
VDDO
BCLK1
GND
BCLK2
C3
10uF
CL = 18 pf
C4
.1uF
ENABLE 1
XTAL_IN
BCLK5
BCLK4
BCLK3
VDDO
GND
VDD
VDDO
DD
F
C5
.1uF
IGURE
= 3.3V and V
16
15
14
13
12
11
10
9
C6
.1uF
5. S
ENABLE 1
CHEMATIC OF
C1
15pF
DDO
VDDO = 3.3V
=
13
VDD = 3.3V
accurate, but minor adjustments might be required. For the
LVCMOS output drivers, two termination examples are shown in
the schematic. For additional termination, examples are shown
in the LVCMOS Termination Application Note.
R
ECOMMENDED
Unused outputs can be left floating. There should be
no trace attached to unused outputs. Device
characterized and specification limits set with all
outputs terminated.
R2
31
L
AYOUT
Optional Termination
Zo = 50 Ohm
Zo = 50 Ohm
ICS83905AM REV. B JANUARY 24, 2008
VDD
R3
100
R4
100
LVCMOS
LVCMOS