1©2016 Integrated Device Technology, Inc. Revision C September 28, 2016
General Description
The 83905I is a low skew, 1-to-6 LVCMOS / LVTTL Fanout Buffer.
The low impedance LVCMOS/LVTTL outputs are designed to
drive 50 series or parallel terminated transmission lines. The
effective fanout can be increased from 6 to 12 by utilizing the
ability of the outputs to drive two series terminated lines.
The 83905I is characterized at full 3.3V, 2.5V, and 1.8V, mixed
3.3V/2.5V, 3.3V/1.8V and 2.5V/1.8V output operating supply
modes. Guaranteed output and part-to-part skew characteristics
along with the 1.8V output capabilities makes the 83905I ideal for
high performance, single ended applications that also require a
limited output voltage.
Pin Assignments
Features
• Six LVCMOS / LVTTL outputs
• Outputs able to drive 12 series terminated lines
• Crystal Oscillator Interface
• Crystal input frequency range: 10MHz to 40MHz
• Output skew: 80ps (maximum)
• RMS phase jitter @ 25MHz, (100Hz – 1MHz): 0.26ps (typical),
V
DD
= V
DDO
= 2.5V
Offset Noise Power
100Hz.................-129.7 dBc/Hz
1kHz...................-144.4 dBc/Hz
10kHz.................-147.3 dBc/Hz
100kHz...............-157.3 dBc/Hz
• 5V tolerant enable inputs
• Synchronous output enables
• Operating power supply modes:
Full 3.3V, 2.5V, 1.8V
Mixed 3.3V core/2.5V output operating supply
Mixed 3.3V core/1.8V output operating supply
Mixed 2.5V core/1.8V output operating supply
• -40°C to 85°C ambient operating temperature
• Lead-free (RoHS 6) packaging
Block Diagram
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
XTAL_IN
ENABLE1
BCLK5
V
DDO
BCLK4
GND
BCLK3
V
DD
BCLK2
GND
BCLK1
V
DDO
BCLK0
GND
ENABLE2
XTAL_OUT
16-Lead TSSOP
4.4mm x 5.0mm x 0.925mm
package body
G Package
Top View
SYNCHRONIZE
SYNCHRONIZE
BCLK
BCLK
BCLK
BCLK
BCLK
BCLK
XTAL_IN
TAL_OUT
ENABLE 1
ENABLE 2
83905I
Datasheet
Low Skew, 1:6 Crystal Interface to
LVCMOS/ LVTTL Fanout Buffer
