Low Skew, 1:6 Crystal Interface to
LVCMOS/ LVTTL Fanout Buffer
Datasheet
83905I
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.
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
•
•
Pin Assignments
XTAL_OUT
ENABLE2
GND
BCLK0
V
DDO
BCLK1
GND
BCLK2
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
Block Diagram
BCLK0
BCLK1
XTAL_IN
BCLK2
XTAL_OUT
16-Lead TSSOP
4.4mm x 5.0mm x 0.925mm
package body
G Package
Top View
ENABLE 1
BCLK3
BCLK4
SYNCHRONIZE
BCLK5
ENABLE 2
SYNCHRONIZE
©2016 Integrated Device Technology, Inc.
1
Revision C September 28, 2016
83905I Datasheet
Pin Descriptions and Characteristics
Table 1. Pin Descriptions
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
XTAL_OUT
ENABLE2
GND
BCLK0
V
DDO
BCLK1
GND
BCLK2
V
DD
BCLK3
GND
BCLK4
V
DDO
BCLK5
ENABLE1
XTAL_IN
Type
Output
Input
Power
Output
Power
Output
Power
Output
Power
Output
Power
Output
Power
Output
Input
Input
Description
Crystal oscillator interface. XTAL_OUT is the output.
Clock enable. LVCMOS/LVTTL interface levels. See Table 3.
Power supply ground.
Clock output. LVCMOS/LVTTL interface levels.
Output supply pin.
Clock output. LVCMOS/LVTTL interface levels.
Power supply ground.
Clock output. LVCMOS/LVTTL interface levels.
Power supply pin.
Clock output. LVCMOS/LVTTL interface levels.
Power supply ground.
Clock output. LVCMOS/LVTTL interface levels.
Output supply pin.
Clock output. LVCMOS/LVTTL interface levels.
Clock enable. LVCMOS/LVTTL interface levels. See Table 3.
Crystal oscillator interface. XTAL_IN is the input.
Table 2. Pin Characteristics
Symbol
C
IN
Parameter
Input Capacitance
Power Dissipation
Capacitance
(per output)
V
DDO
= 3.465V
V
DDO
= 2.625V
V
DDO
= 2.0V
V
DDO
= 3.3V ± 5%
R
OUT
Output Impedance
V
DDO
= 2.5V ± 5%
V
DDO
= 1.8V ± 0.2V
7
7
10
Test Conditions
Minimum
Typical
4
19
18
16
Maximum
Units
pF
pF
pF
pF
C
PD
©2016 Integrated Device Technology, Inc.
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Revision C September 28, 2016
83905I Datasheet
Function Table
Table 3. Output Enable and Clock Enable Function Table
Control Inputs
ENABLE 1
0
0
1
1
ENABLE2
0
1
0
1
Outputs
BCLK[0:4]
LOW
LOW
Toggling
Toggling
BCLK5
LOW
Toggling
LOW
Toggling
BCLK5
BCLK[0:4]
ENABLE2
ENABLE1
Figure 1. Enable Timing Diagram
©2016 Integrated Device Technology, Inc.
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Revision C September 28, 2016
83905I Datasheet
Absolute Maximum Ratings
NOTE: Stresses beyond those listed under
Absolute Maximum Ratings
may cause permanent damage to the device. These ratings are
stress specifications only. Functional operation of product at these conditions or any conditions beyond those listed in the
DC
Characteristics or AC Characteristics
is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
product reliability.
Item
Supply Voltage, V
DD
Inputs, V
I
Outputs, V
O
Package Thermal Impedance,
JA
16-Lead TSSOP package
Storage Temperature, T
STG
Rating
4.6V
-0.5V to V
DD
+ 0.5V
-0.5V to V
DDO
+ 0.5V
89C/W (0 mps)
-65C to 150C
DC Electrical Characteristics
Table 4A. Power Supply DC Characteristics,
V
DD
= V
DDO
= 3.3V ± 5%, T
A
= -40°C to 85°C
Symbol
V
DD
V
DDO
I
DD
I
DDO
Parameter
Power Supply Voltage
Output Supply Voltage
Power Supply Current
Output Supply Current
ENABLE [1:2] = 00
ENABLE [1:2] = 00
Test Conditions
Minimum
3.135
3.135
Typical
3.3
3.3
Maximum
3.465
3.465
10
5
Units
V
V
mA
mA
Table 4B. Power Supply DC Characteristics,
V
DD
= V
DDO
= 2.5V ± 5%, T
A
= -40°C to 85°C
Symbol
V
DD
V
DDO
I
DD
I
DDO
Parameter
Power Supply Voltage
Output Supply Voltage
Power Supply Current
Output Supply Current
ENABLE [1:2] = 00
ENABLE [1:2] = 00
Test Conditions
Minimum
2.375
2.375
Typical
2.5
2.5
Maximum
2.625
2.625
8
4
Units
V
V
mA
mA
Table 4C. Power Supply DC Characteristics,
V
DD
= V
DDO
= 1.8V ± 0.2V, T
A
= -40°C to 85°C
Symbol
V
DD
V
DDO
I
DD
I
DDO
Parameter
Power Supply Voltage
Output Supply Voltage
Power Supply Current
Output Supply Current
ENABLE [1:2] = 00
ENABLE [1:2] = 00
Test Conditions
Minimum
1.6
1.6
Typical
1.8
1.8
Maximum
2.0
2.0
5
3
Units
V
V
mA
mA
©2016 Integrated Device Technology, Inc.
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Revision C September 28, 2016
83905I Datasheet
Table 4D. Power Supply DC Characteristics,
V
DD
= 3.3V ± 5%, V
DDO
= 2.5V ± 5%, T
A
= -40°C to 85°C
Symbol
V
DD
V
DDO
I
DD
I
DDO
Parameter
Power Supply Voltage
Output Supply Voltage
Power Supply Current
Output Supply Current
ENABLE [1:2] = 00
ENABLE [1:2] = 00
Test Conditions
Minimum
3.135
2.375
Typical
3.3
2.5
Maximum
3.465
2.625
10
4
Units
V
V
mA
mA
Table 4E. Power Supply DC Characteristics,
3.3V ± 5%, V
DDO
= 1.8V ± 0.2V, T
A
= -40°C to 85°C
Symbol
V
DD
V
DDO
I
DD
I
DDO
Parameter
Power Supply Voltage
Output Supply Voltage
Power Supply Current
Output Supply Current
ENABLE [1:2] = 00
ENABLE [1:2] = 00
Test Conditions
Minimum
3.135
1.6
Typical
3.3
1.8
Maximum
3.465
2.0
10
3
Units
V
V
mA
mA
Table 4F. Power Supply DC Characteristics,
V
DD
= 2.5V ± 5%, V
DDO
= 1.8V ± 0.2V, T
A
= -40°C to 85°C
Symbol
V
DD
V
DDO
I
DD
I
DDO
Parameter
Power Supply Voltage
Output Supply Voltage
Power Supply Current
Output Supply Current
ENABLE [1:2] = 00
ENABLE [1:2] = 00
Test Conditions
Minimum
2.375
1.6
Typical
2.5
1.8
Maximum
2.625
2.0
8
3
Units
V
V
mA
mA
©2016 Integrated Device Technology, Inc.
5
Revision C September 28, 2016
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