Femtoclocks® Crystal-to-3.3V
LVPECL Frequency Synthesizer
843004-01
Data Sheet
©2016 Integrated Device Technology, Inc Revision B January 18, 20161
GENERAL DESCRIPTION
The 843004-01 is a 4 output LVPECL 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, the following frequencies
can be generated based on the settings of 2 frequency select pins
(F_SEL[1:0]): 156.25MHz, 125MHz, 62.5MHz. The 843004-01
uses IDT’s 3
rd
generation low phase noise VCO technology and
can achieve 1ps or lower typical rms phase jitter, easily meeting
Ethernet jitter requirements. The 843004-01 is packaged in a small
24-pin TSSOP package.
FEATURES
Four 3.3V LVPECL outputs
Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
Supports the following output frequencies:
156.25MHz, 125MHz and 62.5MHz
VCO range: 560MHz - 680MHz
RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.57ps (typical)
RMS phase noise at 156.25MHz (typical)
Phase noise:
Offset Noise Power
100Hz ................-95.5 dBc/Hz
1kHz .................-118 dBc/Hz
10kHz .................-126 dBc/Hz
100kHz ..............-126.6 dBc/Hz
Full 3.3V supply mode
-30°C to 85°C ambient operating temperature
Available in lead-free RoHS compliant package
PIN ASSIGNMENT
11
0
1
0
Phase
Detector
VCO
625MHz
(w/25MHz
Reference)
OSC
M = 25 (fixed)
F_SEL[1:0]
0 0 ÷4
0 1 ÷5
1 0 ÷10
1 1
not used
2
843004-01
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
package body
G Package
Top View
nQ1
Q1
V
CCo
Q0
nQ0
MR
nPLL_SEL
nc
V
CCA
F_SEL0
V
CC
F_SEL1
1
2
3
4
5
6
7
8
9
10
11
12
nQ2
Q2
V
CCO
Q3
nQ3
V
EE
VCC
nXTAL_SEL
TEST_CLK
V
EE
XTAL_IN
XTAL_OUT
24
23
22
21
20
19
18
17
16
15
14
13
BLOCK DIAGRAM
Inputs
Output Frequency
(25MHz Ref.)
F_SEL1 F_SEL0
M Divider
Value
N Divider
Value
M/N
Divider Value
0 0 25 4 6.25 156.25
0 1 25 5 5 125
1 0 25 10 2.5 62.5
1 1 25 not used not used
FREQUENCY SELECT FUNCTION TABLE
F_SEL[1:0]
nPLL_SEL
TEST_CLK
XTAL_IN
XTAL_OUT
nXTAL_SEL
MR
Q0
nQO
Q1
nQ1
Q2
nQ2
Q3
nQ3
Pulldown
Pulldown
25MHz
Pulldown
Pulldown
Pulldown
843004-01 Data Sheet
©2016 Integrated Device Technology, Inc Revision B January 18, 20162
TABLE 1. PIN DESCRIPTIONS
TABLE 2. PIN CHARACTERISTICS
Number Name Type Description
1, 2 nQ1, Q1 Output Differential output pair. LVPECL interface levels.
3, 22 V
CCO
Power Output supply pins.
4, 5 Q0, nQ0 Ouput Differential output pair. LVPECL interface levels.
6 MR Input Pulldown
Active HIGH Master Reset. When logic HIGH, the internal dividers are reset
causing the true outputs Qx to go low and the inverted outputs nQx
to go high. When logic LOW, the internal dividers and the outputs are enabled.
LVCMOS/LVTTL interface levels.
7 nPLL_SEL Input Pulldown
Selects between the PLL and TEST_CLK as input to the dividers. When LOW,
selects PLL (PLL Enable). When HIGH, deselects the reference clock (PLL
Bypass). LVCMOS/LVTTL interface levels.
8 nc Unused No connect.
9V
CCA
Power Analog supply pin.
10, 12
F_SEL0,
F_SEL1
Input Pulldown Frequency select pins. LVCMOS/LVTTL interface levels.
11, 18 V
CC
Power Core supply pin.
13, 14
XTAL_OUT,
XTAL_IN
Input
Parallel resonant crystal interface. XTAL_OUT is the output,
XTAL_IN is the input.
15, 19 V
EE
Power Negative supply pins.
16 TEST_CLK Input Pulldown LVCMOS/LVTTL clock input.
17 nXTAL_SEL Input Pulldown
Selects between crystal or TEST_CLK inputs as the the PLL Reference
source. Selects XTAL inputs when LOW. Selects TEST_CLK when HIGH.
LVCMOS/LVTTL interface levels.
20, 21 nQ3, Q3 Output Differential output pair. LVPECL interface levels.
23, 24 Q2, nQ2 Output Differential output pair. LVPECL interface levels.
NOTE:
Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Symbol Parameter Test Conditions Minimum Typical Maximum Units
C
IN
Input Capacitance 4 pF
R
PULLDOWN
Input Pulldown Resistor 51 kΩ
843004-01 Data Sheet
©2016 Integrated Device Technology, Inc Revision B January 18, 20163
TABLE 3A. POWER SUPPLY DC CHARACTERISTICS, V
CC
= V
CCA
= V
CCO
= 3.3V±5%, TA = -30°C TO 85°C
TABLE 3B. LVCMOS / LVTTL DC CHARACTERISTICS, V
CC
= V
CCA
= V
CCO
= 3.3V±5%, TA = -30°C TO 85°C
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
IH
Input High Voltage 2 V
CC
+ 0.3 V
V
IL
Input
Low Voltage
nPLL_SEL, nXTAL_SEL,
F_SEL0, F_SEL1, MR
-0.3 0.8 V
TEST_CLK -0.3 1.3 V
I
IH
Input
High Current
TEST_CLK, MR, nPLL_
SEL, nXTAL_SEL, F_SEL0,
F_SEL1
V
CC
= V
IN
= 3.465V 150 µA
I
IL
Input
Low Current
TEST_CLK, MR, nPLL_
SEL, nXTAL_SEL, F_SEL0,
F_SEL1
V
CC
= 3.465V, V
IN
= 0V -5 µA
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
4.6V
Inputs, V
I
-0.5V to V
CC
+ 0.5V
Outputs, I
O
Continuous Current 50mA
Surge Current 100mA
Package Thermal Impedance, θ
JA
70°C/W (0 mps)
Storage Temperature, T
STG
-65°C to 150°C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifi cations only. Functional
operation of product at these conditions or any conditions
beyond those listed in the DC Characteristics or AC Charac-
teristics is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
CC
Core Supply Voltage 3.135 3.3 3.465 V
V
CCA
Analog Supply Voltage 3.135 3.3 3.465 V
V
CCO
Output Supply Voltage 3.135 3.3 3.465 V
I
EE
Power Supply Current 135 mA
I
CCA
Analog Supply Current Included in I
EE
15 mA
TABLE 3C. LVPECL DC CHARACTERISTICS, V
CC
= V
CCA
= V
CCO
= 3.3V±5%, TA = -30°C TO 85°C
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
OH
Output High Voltage; NOTE 1 V
CCO
- 1.4 V
CCO
- 0.9 V
V
OL
Output Low Voltage; NOTE 1 V
CCO
- 2.0 V
CCO
- 1.7 V
V
SWING
Peak-to-Peak Output Voltage Swing 0.6 1.0 V
NOTE 1: Outputs terminated with 50
Ω to V
CCO
- 2V.

843004AG-01LF

Mfr. #:
Manufacturer:
IDT
Description:
Clock Synthesizer / Jitter Cleaner 4 LVPECL OUT SYNTHESIZER
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet