1©2015 Integrated Device Technology, Inc December 7, 2015
General Description
The 840004-11 is a 4 output LVCMOS/LVTTL Synthesizer optimized
to generate Ethernet reference clock frequencies and is a member of
the family of high performance clock solutions from IDT. Using a
25MHz, 18pF parallel resonant crystal, 125MHz and 62.5MHz can
be generated based on one frequency select pin (F_SEL). The
840004-11 uses IDT’s 3
rd
generation low phase noise VCO
technology and can achieve 1ps or lower typical random rms phase
jitter, easily meeting Ethernet jitter requirements. The 840004-11 is
packaged in a small 20-pin TSSOP package.
Features
Four single-ended LVCMOS/LVTTL outputs
17 typical output impedance
Crystal oscillator interface
Input frequency range: 22.4MHz to 28MHz
Output frequency range: 56MHz - 140MHz
VCO range: 560MHz - 700MHz
RMS phase jitter at 125MHz (1.875MHz – 20MHz):
0.70ps (typical)
Phase Noise:
Offset Noise Power
100Hz -95.5 dBc/Hz
1kHz -123.6 dBc/Hz
10kHz -132.8 dBc/Hz
100kHz -133.4 dBc/Hz
Full 3.3V output supply mode
0°C to 70°C ambient operating temperature
Available in lead-free (RoHS 6) package
Frequency Select Function Table for Ethernet Frequencies
Inputs
Output Frequency (MHz), 25MHz ReferenceF_SEL M Divider Value N Divider Value
0 25 10 62.5
1 25 5 125 (default)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
nc
V
DDA
nc
nc
OE
nc
nc
nc
F_SEL
V
DD
nc
GND
Q0
Q1
V
DDO
Q2
Q3
GND
XTAL_IN
XTAL_OUT
OSC
VCO
M = ÷25 (fixed)
F_SEL
0 ÷10
1 ÷5
(default)
N
Phase
Detector
Q0
Q1
Q2
Q3
OE
F_SEL
XTAL_IN
XTAL_OUT
25MHz
Pullup
Pullup
ICS840004-01
20-Lead TSSOP
6.5mm x 4.4mm x 0.925mm
package body
G Package
Top View
Pin Assignment
Block Diagram
840004-11
Datasheet
FemtoClock™ Crystal-to-LVCMOS/LVTTL
Frequency Synthesizer
2©2015 Integrated Device Technology, Inc December 7, 2015
840004-11 Datasheet
Table 1. Pin Descriptions
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Number Name Type Description
1 F_SEL Input Pullup Frequency select pin. LVCMOS/LVTTL interface levels.
2, 3, 4, 6,
7, 9, 20
nc Unused No connect.
5 OE Input Pullup
Output enable pin. When HIGH, the outputs are active. When LOW, the
outputs are in a high impedance state. LVCMOS/LVTTL interface levels.
8V
DDA
Power Analog supply pin.
10 V
DD
Power Core supply pin.
11,
12
XTAL_OUT,
XTAL_IN
Input Crystal oscillator interface. XTAL_IN is the input. XTAL_OUT is the output.
13, 19 GND Power Power supply ground.
14, 15, 17, 18 Q3, Q2, Q1, Q0 Output
Single-ended clock outputs. 17 typical output impedance.
LVCMOS/ LVTTL interface levels.
16 V
DDO
Power Output supply pin.
Symbol Parameter Test Conditions Minimum Typical Maximum Units
C
IN
Input Capacitance 4pF
C
PD
Power Dissipation Capacitance V
DD
= V
DDO
= 3.465V 8 pF
R
PULLUP
Input Pullup Resistor 51 k
R
OUT
Output Impedance 17
3©2015 Integrated Device Technology, Inc December 7, 2015
840004-11 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.
DC Electrical Characteristics
Table 3A. Power Supply DC Characteristics, V
DD
= V
DDO
= 3.3V ± 5%, T
A
= 0°C to 70°C
Table 3B. LVCMOS/LVTTL DC Characteristics, V
DD
= V
DDO
= 3.3V ± 5%, T
A
= 0°C to 70°C
NOTE 1: Outputs terminated with 50 to V
DDO
/2. See Parameter Measurement Information section. Load Test Circuit diagram.
Table 4. Crystal Characteristics
NOTE: Characterized using an 18pF parallel resonant crystal.
Item Rating
Supply Voltage, V
DD
4.6V
Inputs, V
I
-0.5V to V
DD
+ 0.5V
Outputs, V
O
-0.5V to V
DDO
+ 0.5V
Package Thermal Impedance,
JA
73.2C/W (0 lfpm)
Storage Temperature, T
STG
-65C to 150C
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
DD
Core Supply Voltage 3.135 3.3 3.465 V
V
DDA
Analog Supply Voltage 3.135 3.3 3.465 V
V
DDO
Output Supply Voltage 3.135 3.3 3.465 V
I
DD
Power Supply Current 100 mA
I
DDA
Analog Supply Current 12 mA
I
DDO
Output Supply Current No Load 10 mA
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
IH
Input High Voltage 2 V
DD
+ 0.3 V
V
IL
Input Low Voltage -0.3 0.8 V
I
IH
Input High Current OE, F_SEL V
DD
= V
IN
= 3.465V 5 µA
I
IL
Input Low Current OE, F_SEL V
DD
= 3.465V, V
IN
= 0V -150 µA
V
OH
Output High Voltage; NOTE 1 V
DDO
= 3.3V ± 5% 2.6 V
V
OL
Output Low Voltage; NOTE 1 V
DDO
= 3.3V ± 5% 0.5 V
Parameter Test Conditions Minimum Typical Maximum Units
Mode of Oscillation Fundamental
Frequency 25 MHz
Equivalent Series Resistance (ESR) 50
Shunt Capacitance 7pF
Drive Level 1mW

840004AG-11LF

Mfr. #:
Manufacturer:
IDT
Description:
Clock Synthesizer / Jitter Cleaner 4 LVCMOS OUT SYNTHESIZER
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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