DS21600/DS21602/DS21604
3.3V/5V Clock Rate Adapter
www.maxim-ic.com
GENERAL DESCRIPTION
The DS21600/DS21602/DS21604 are multiple-rate
clock adapters that convert between E-carrier and T-
carrier clocks rates. A T1 or E1 clock output,
CLKOUT1, is available, along with a higher multiple
rate clock output, CLKOUT2. CLKOUT1 and
CLKOUT2 are frequency locked to the clock input
CLKIN. The clock outputs, along with frame-sync
output, can be phase-aligned to a frame-sync input.
The devices are fully compatible with the LXP600A,
LXP602, and LXP604, and operate from either a 5V
or 3.3V supply. All operation modes include a
standard 8kHz output.
The DS21600/DS21602/DS21604 are available in
16-pin SO, and are rated for industrial temperatures.
FEATURES
Direct Drop-In Replacement for LXP600ASE,
LXP602SE, and LXP604SE
Converts E-Carrier Clock Rates to T-Carrier
Clock Rates
Converts T-Carrier Clock Rates to E-Carrier
Clock Rates
3.3V or 5V Supply
Low Jitter Output
Multiple Output Clocks Synchronized to
Input Clock
8kHz Frequency-Locked Output for All
Operation Modes
No External Components Required
16-Pin SO and 8-Pin DIP
Industrial Temperature Range: -40°C to
+85°C
ORDERING INFORMATION
PART
DS21600SN
DS21600SN+
DS21600N
DS21600N+
DS21602SN
DS21602SN+
DS21602N
DS21602N+
DS21604SN
DS21604SN+
DS21604N
DS21604N+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 SO
16 SO
8 DIP
8 DIP
16 SO
16 SO
8 DIP
8 DIP
16 SO
16 SO
8 DIP
8 DIP
PIN CONFIGURATION
TOP VIEW
Dallas
Semiconductor
DS21600/2/4
+
Denotes a lead(Pb)-free/RoHS-compliant device.
FREQUENCY CONVERSIONS (MHz)
PART
DS21600
DS21602
DS21604
CLKIN
1.544
2.048
1.544
2.048
1.544
4.096
CLKOUT1
2.048
1.544
2.048
1.544
4.096
1.544
CLKOUT2
6.144
6.176
8.192
6.176
8.192
6.176
SO
Note:
Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here:
www.maxim-ic.com/errata.
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REV: 011606
TABLE OF CONTENTS
1.
1.1
PIN DESCRIPTION ................................................................................................ 3
P
IN
N
AME
C
ROSS
-R
EFERENCE TO
LXP60X ......................................................................... 3
2.
2.1
2.2
FUNCTIONAL DESCRIPTION ............................................................................... 4
M
ODE
S
ELECT
..................................................................................................................... 4
F
RAME
-S
YNC
I
NPUT
............................................................................................................. 4
3.
3.1
OUTPUT JITTER.................................................................................................... 4
J
ITTER
T
RANSFER
................................................................................................................ 5
4.
5.
6.
OPERATING PARAMETERS................................................................................. 7
PACKAGE INFORMATION.................................................................................. 11
REVISION HISTORY............................................................................................ 12
LIST OF FIGURES
Figure 1-1. Block Diagram ........................................................................................................................3
Figure 3-1. Nominal Jitter Transer for 2.048MHz to 1.544MHz Conversion.............................................5
Figure 3-2. Nominal Jitter Transfer for 1.544MHz to 2.048MHz Conversion ............................................6
Figure 4-1. DS21600/DS21602 High-to-Low Frequency Conversion Frame-Sync Alignment .................8
Figure 4-2. DS21604 High-To-Low Frequency Conversion Frame-Sync Alignment ................................9
Figure 4-3. DS21600 Low-to-High Frequency Conversion Frame-Sync Alignment .................................9
Figure 4-4. DS21602 Low-to-High Frequency Conversion Frame-Sync Alignment ...............................10
Figure 4-5. DS21604 Low-to-High Frequency Conversion Frame-Sync Alignment ...............................10
LIST OF TABLES
Table 1-A. Pin Description ........................................................................................................................3
Table 1-B. Pin Name Cross-Reference to LXP60x...................................................................................3
Table 2-A. Frequency Conversions (MHz) ...............................................................................................4
Table 3-A. Output Jitter Specifications .....................................................................................................4
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1. PIN DESCRIPTION
Table 1-A. Pin Description
PIN
DIP
—
1
2
3
4
5
6
7
8
SO
1, 3, 6, 8, 10,
11, 13, 15
2
4
5
7
9
12
14
16
NAME
N.C.
SYNCOUT
CLKOUT2
CLKIN
CLKOUT1
Vss
SEL
SYNCIN
V
DD
TYPE
—
Output
Output
Input
Output
Supply
Input
Input
Supply
No Connect
Synchronization Output. An 8kHz output that can be
synchronized to the clock outputs.
Clock Output 2. T1 or E1 carrier clock output referenced to
CLKIN.
Clock Input. Reference Clock Input. CLKOUT1 and CLKOUT2
will be referenced to this clock.
Clock Output 1. T1 or E1 carrier clock output referenced to
CLKIN.
Ground
Clock Mode Select. Conversion mode select.
Synchronization Input. Used to synchronize the clock outputs
and SYNCOUT to CLKIN and SYNCIN. SYNCIN should be tied
high or low when not in use.
Positive Supply, 3.3V or 5V ±5%
FUNCTION
1.1 Pin Name Cross-Reference to LXP60X
Table 1-B. Pin Name Cross-Reference to LXP60x
DS21600/DS21602
/DS21604
SYNCOUT
CLKOUT2
CLKIN
CLKOUT1
V
SS
SEL
SYNCIN
N.C.
V
DD
LXP600ALXP602/L
XP604
FSO
HFO
CLKI
CLKO
GND
SEL
FSI
N.C.
V
CC
FUNCTION
Synchronization Pulse Output
Clock 2 Output
Clock Input
Clock 1 Output
Ground
Clock Mode Select
Synchronization Pulse Input
No Connect
Positive Supply
Figure 1-1. Block Diagram
CLKOUT2
CLKIN
ANALOG
PLL
FEEDBACK
CIRCUIT
Dallas Semiconductor
DS21600/DS21602/DS21604
OUTPUT
DIVIDER
CLKOUT1
SEL
SYNCIN
FRAME SYNC
GENERATOR
SYNCOUT
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2. FUNCTIONAL DESCRIPTION
A clock input at CLKIN is converted to an alternate clock rate available on CLKOUT1. A higher multiple-rate clock
also is available on CLKOUT2. Additionally, an 8kHz clock locked to CLKIN is always available at the SYNCOUT
pin. The SEL pin controls clock-rate conversion selection.
2.1
Mode Select
The SEL pin is used to select the operating frequencies.
Table 2-A
shows the SEL state for the various operating
modes of the DS21600, DS21602, and DS21604.
Table 2-A. Frequency Conversions (MHz)
PART
DS21600
DS21602
DS21604
SEL
0
1
0
1
0
1
CLKIN
1.544
2.048
1.544
2.048
1.544
4.096
CLKOUT1
2.048
1.544
2.048
1.544
4.096
1.544
CLKOUT2
6.144
6.176
8.192
6.176
8.192
6.176
2.2
Frame-Sync Input
In all cases, CLKOUT1 and CLKOUT2 are frequency-locked to CLKIN. CLKOUT1, CLKOUT2, and SYNCOUT
are phased-locked to SYNCIN when SYNCIN is asserted. The signal applied to SYNCIN can be 8kHz or some
integer subrate such as 1kHz, 2kHz, or 4kHz. Phase synchronization occurs within a maximum of 50ms when
SYNCIN is 8kHz.
3. OUTPUT JITTER
Table 3-A
shows the output jitter specifications for 2.048MHz (or 4.096MHz) to 1.544MHz conversions (SEL = 1)
and 1.544MHz to 2.048MHz (or 4.096MHz) conversions (SEL = 0).
Table 3-A. Output Jitter Specifications
CLKIN
(MHz)
1.544
2.048 or
4.096
CLKOUT1
(MHz)
2.048
1.544
FREQUENCY
BAND
20Hz–100kHz
18kHz–100kHz
No bandlimiting
10Hz–40kHz
8kHz–40kHz
SPECIFICATION
G.823
G.823
TR62411
TR62411
TR62411
VALUE
1.500
0.200
0.050
0.025
0.025
TYP
0.018
0.012
0.010
0.005
0.006
MAX
0.035
0.025
0.020
0.010
0.012
UNITS
UI
P-P
UI
P-P
UI
P-P
UI
P-P
UI
P-P
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3.1
Jitter Transfer
Figure 3-1
and
Figure 3-2
show jitter transfer for 2.048MHz-to-1.544MHz conversions and vice versa.
Figure 3-1. Nominal Jitter Transfer for 2.048MHz-to-1.544MHz Conversion
2
JITTER GAIN (ns/ns)
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0
10
20
30
40
50
60
70
80
JITTER FREQUENCY (kHz)
NOTE:
THE TYPICAL PEAK JITTER GAIN OF THE DS21600/DS21602/DS21604 IS ABOUT 1.6 FOR CONVERSION FROM T1
TO E1. THE TYPICAL PEAK-JITTER GAIN OF THE LEVEL ONE DEVICE IS ABOUT 1.1. HOWEVER, THE JITTER GAIN FOR
THE DS21600/DS21602/DS21604 PEAKS IN THE 4kHz TO 8kHz RANGE, WHEREAS THE PEAK JITTER GAIN FOR THE
LXP6XX DEVICES SPANS A GREATER FREQUENCY RANGE (20kHz TO 40kHz).
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