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843002AGI-01LF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
FemtoClocks® Crystal-to-
3.3V, 2.5V LVPECL Frequency Synthesizer
843002I-01
DATASHEET
843002I-01 REVISION A 2/20/15 1 ©2015 Integrated Device Technology, Inc.
GENERAL DESCRIPTION
The 843002I-01 is a 2 output LVPECL synthesizer optimized to
generate Ethernet reference clock frequencies. Using a 25MHz
18pF parallel resonant crystal, the following frequencies can be
generated based on the 2 frequency select pins (F_SEL[1:0]):
156.25MHz, 125MHz, and 62.5MHz. The 843002I-01 uses
IDT’s FemtoClock
®
low phase noise VCO technology and can
achieve 1ps or lower typical rms phase jitter, easily meeting
Ethernetjitter requirements. The 843002I-01 is packaged in a
small 20-pin TSSOP package.
FEATURES
• Two 3.3V or 2.5V 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): 0.55ps (typical)
• Output skew: 30ps (maximum)
• Supply Voltage Modes
Core/Outputs
3.3/3.3
2.5/2.5
• -40°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)
M = 25 (fixed)
F_SEL[1:0]
0 0 ÷4
(default)
0 1 ÷5
1 0 ÷10
1 1 ÷5
OSC
2
843002I-01
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
G Package
Top View
BLOCK DIAGRAM
FREQUENCY SELECT FUNCTION TABLE
F_SEL[1:0]
nPLL_SEL
REF_CLK
XTAL_IN
XTAL_OUT
nXTAL_SEL
MR
Q0
nQ0
Q1
nQ1
Pulldown
Pulldown
25MHz
nc
V
CCO
Q0
nQ0
MR
nPLL_SEL
nc
V
CCA
F_SEL0
V
CC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CCO
Q1
nQ1
V
EE
VCC
nXTAL_SEL
REF_CLK
XTAL_IN
XTAL_OUT
F_SEL1
Pulldown
Pulldown
Pulldown
Inputs
Output Frequency
(25MHz Ref.)
F_SEL1 F_SEL0
M Divider
Value
N Divider
Value
0 0 25 4 156.25 (default)
0 1 25 5 125
1 0 25 10 62.5
1 1 25 5 125
FEMTOCLOCKS® CRYSTAL-TO-
3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
843002I-01 DATA SHEET
2 REVISION A 2/20/15
TABLE 1. PIN DESCRIPTIONS
TABLE 2. PIN CHARACTERISTICS
Symbol Parameter Test Conditions Minimum Typical Maximum Units
C
IN
Input Capacitance 4 pF
R
PULLDOWN
Input Pulldown Resistor 51 kΩ
Number Name Type Description
1, 7 nc Unused No connect.
2, 20 V
CCO
Power Output supply pins.
3, 4 Q0, nQ0 Ouput Differential output pair. LVPECL interface levels.
5 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 en-
abled. LVCMOS/LVTTL interface levels.
6 nPLL_SEL Input Pulldown
Determines whether synthesizer is in PLL or bypass mode. LVCMOS/LVTTL
interface levels.
8V
CCA
Power Analog supply pin.
9, 11
F_SEL0,
F_SEL1
Input Pulldown Frequency select pins. LVCMOS/LVTTL interface levels.
10, 16 V
CC
Power Core supply pin.
12, 13
XTAL_OUT,
XTAL_IN
Input
Parallel resonant crystal interface. XTAL_OUT is the output,
XTAL_IN is the input.
14 REF_CLK Input Pulldown LVCMOS/LVTTL reference clock input.
15 nXTAL_SEL Input Pulldown
Selects between crystal or REF_CLK inputs as the the PLL Reference
source. Selects XTAL inputs when LOW. Selects REF_CLK when HIGH.
LVCMOS/LVTTL interface levels.
17 V
EE
Power Negative supply pins.
18, 19 nQ1, Q1 Output Differential output pair. LVPECL interface levels.
NOTE: Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
REVISION A 2/20/15
843002I-01 DATA SHEET
3 FEMTOCLOCKS® CRYSTAL-TO-
3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
TABLE 3A. POWER SUPPLY DC CHARACTERISTICS, V
CC
= V
CCA
= V
CCO
= 3.3V±10%, TA = -40°C TO 85°C
TABLE 3C. LVCMOS / LVTTL DC CHARACTERISTICS, V
CC
= V
CCA
= V
CCO
= 3.3V±10% OR 2.5V±5%, TA = -40°C TO 85°C
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
73.2°C/W (0 lfpm)
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.
TABLE 3B. POWER SUPPLY DC CHARACTERISTICS, V
CC
= V
CCA
= V
CCO
= 2.5V±5%, TA = -40°C TO 85°C
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
CC
Core Supply Voltage 2.97 3.3 3.63 V
V
CCA
Analog Supply Voltage 2.97 3.3 3.63 V
V
CCO
Output Supply Voltage 2.97 3.3 3.63 V
I
EE
Power Supply Current 130 mA
I
CCA
Analog Supply Current 13 mA
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
CC
Core Supply Voltage 2.375 2.5 2.625 V
V
CCA
Analog Supply Voltage 2.375 2.5 2.625 V
V
CCO
Output Supply Voltage 2.375 2.5 2.625 V
I
EE
Power Supply Current 115 mA
I
CCA
Analog Supply Current 12 mA
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
IH
Input High Voltage
V
CC
= 3.3V 2 V
CC
+ 0.3 V
V
CC
= 2.5V 1.7 V
CC
+ 0.3 V
V
IL
Input Low Voltage
V
CC
= 3.3V -0.3 0.8 V
V
CC
= 2.5V -0.3 0.7 V
I
IH
Input
High Current
REF_CLK, MR, nPLL_
SEL, nXTAL_SEL
V
CC
= V
IN
= 3.63V or 2.625V 150 µA
I
IL
Input
Low Current
REF_CLK, MR, nPLL_
SEL, nXTAL_SEL
V
CC
= V
IN
= 3.63V or 2.625V -5 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

843002AGI-01LF

Mfr. #:
Buy 843002AGI-01LF
Manufacturer:
IDT
Description:
Clock Synthesizer / Jitter Cleaner 2 LVPECL OUT SYNTHESIZER
Lifecycle:
New from this manufacturer.
Delivery:
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