8T39S04A Datasheet, PDF (1/36 Pages) Integrated Device Technology – Crystal or Differential to Differential Clock Fanout Buffer

Crystal or Differential to
Differential Clock Fanout Buffer
8T39S04A
Datasheet
General Description
The 8T39S04A is a high-performance clock fanout buffer. The input
clock can be selected from two differential inputs or one crystal input.
The internal oscillator circuit is automatically disabled if the crystal
input is not selected. The crystal pin can be driven by a single-ended
clock.The selected signal is distributed to four differential outputs
which can be configured as LVPECL, LVDS or HSCL outputs. In
addition, an LVCMOS output is provided. All outputs can be disabled
into a high-impedance state. The device is designed for a signal
fanout of high-frequency, low phase-noise clock and data signal. The
outputs are at a defined level when inputs are open or tied to ground.
It is designed to operate from a 3.3V or 2.5V core power supply, and
either a 3.3V or 2.5V output operating supply.
Block Diagram
PullDown
PullDown
Features
• Two differential reference clock input pairs
• Differential input pairs can accept the following input levels:
LVPECL, LVDS, HCSL, HSTL and Single-ended
• Crystal Oscillator Interface
• Crystal input frequency range: 10MHz to 40MHz
• Maximum Output Frequency
LVPECL - 2GHz
LVDS - 2GHz
HCSL - 250MHz
LVCMOS - 250MHz
• Two banks, each has two differential output pairs that can be
configured as LVPECL or LVDS or HCSL
• One single-ended reference output with synchronous enable to
avoid clock glitch
• Output skew: 80ps (maximum), Bank A and Bank B at the same
output level
• Part-to-part skew: 200ps (typical), design target
• Additive RMS phase jitter @ 156.25MHz, (12kHz - 20MHz):
34.7fs (typical), 3.3V/ 3.3V
• Supply voltage modes:
V_DD/V_DDO
3.3V/3.3V
3.3V/2.5V
2.5V/2.5V
• -40°C to 85°C ambient operating temperature
• Lead-free (RoHS 6) packaging
Pin Assignment
REFOUT
24 23 22 21 20 19 18 17
nc 25
16
nCLK1 26
15
CLK1 27
14
V_DD 28
REFOUT 29
13
8T39S04A
12
V_DDOREF 30
11
OE_SE 31
10
SMODE1 32
9
12345678
REF_SEL1
nCLK0
CLK0
REF_SEL0
XTAL_OUT
XTAL_IN
V_DD
SMODE0
©2016 Integrated Device Technology, Inc.
32-pin, 5mm x 5mm VFQFN Package
1
May 20, 2016