1 of 13 REV: 032803
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.
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.
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE
DS21600SN -40°C to +85°C 16 SO
DS21600N -40°C to +85°C 8 DIP
DS21602SN -40°C to +85°C 16 SO
DS21602N -40°C to +85°C 8 DIP
DS21604SN -40°C to +85°C 16 SO
DS21604N -40°C to +85°C 8 DIP
FREQUENCY CONVERSIONS (MHz)
PART CLKIN CLKOUT1 CLKOUT2
1.544 2.048 6.144
DS21600 2.048 1.544 6.176
1.544 2.048 8.192
DS21602 2.048 1.544 6.176
1.544 4.096 8.192
DS21604 4.096 1.544 6.176
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
PIN CONFIGURATION
DS21600/DS21602/DS21604
3.3V/5V Clock Rate Adapte
r
www.maxim-ic.com
Dallas
Semiconductor
DS21600/2/4
TOP VIEW
SO
DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter
2 of 13
TABLE OF CONTENTS
1. PIN DESCRIPTION ......................................................................................................................3
1.1 PIN NAME CROSS-REFERENCE TO LXP60X ....................................................................................................3
2. FUNCTIONAL DESCRIPTION......................................................................................................4
2.1 MODE SELECT................................................................................................................................................4
2.2 FRAME SYNC INPUT ........................................................................................................................................4
3. OUTPUT JITTER..........................................................................................................................4
3.1 JITTER TRANSFER ..........................................................................................................................................5
4. OPERATING PARAMETERS .......................................................................................................7
5. PACKAGE INFORMATION ........................................................................................................11
6. REVISION HISTORY..................................................................................................................13
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
DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter
3 of 13
1. PIN DESCRIPTION
Table 1-A. Pin Description
PIN
DIP SO NAME TYPE FUNCTION
— 1, 3, 6, 8, 10,
11, 13, 15 N.C. — No Connect
1 2 SYNCOUT Output
Synchronization Output. An 8kHz output that can be
synchronized to the clock outputs.
2 4 CLKOUT2 Output
Clock Output 2. T1 or E1 carrier clock output referenced to
CLKIN.
3 5 CLKIN Input
Clock Input. Reference Clock Input. CLKOUT1 and CLKOUT2
will be referenced to this clock.
4 7 CLKOUT1 Output
Clock Output 1. T1 or E1 carrier clock output referenced to
CLKIN.
5 9 Vss Supply Ground
6 12 SEL Input Clock Mode Select. Conversion mode select.
7 14 SYNCIN Input
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.
8 16 VDD Supply Positive Supply, 3.3V or 5V ±5%
1.1 Pin Name Cross-Reference to LXP60X
Table 1-B. Pin Name Cross-Reference to LXP60x
DS21600/DS21602
/DS21604
LXP600ALXP602/
LXP604 FUNCTION
SYNCOUT FSO Synchronization Pulse Output
CLKOUT2 HFO Clock 2 Output
CLKIN CLKI Clock Input
CLKOUT1 CLKO Clock 1 Output
VSS GND Ground
SEL SEL Clock Mode Select
SYNCIN FSI Synchronization Pulse Input
N.C. N.C. No Connect
VDD V
CC Positive Supply
Figure 1-1. Block Diagram
ANALOG
PLL
OUTPUT
DIVIDER
FRAME SYNC
GENERATOR
CLKIN
SEL
SYNCIN
CLKOUT2
CLKOUT1
SYNCOUT
FEEDBACK
CIRCUIT
Dallas Semiconductor
DS21600/DS21602/DS21604
DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter
4 of 13
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 SEL CLKIN CLKOUT1 CLKOUT2
0 1.544 2.048 6.144
DS21600 1 2.048 1.544 6.176
0 1.544 2.048 8.192
DS21602 1 2.048 1.544 6.176
0 1.544 4.096 8.192
DS21604 1 4.096 1.544 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)
CLKOUT1
(MHz)
FREQUENCY
BAND SPECIFICATION VALUE TYP MAX UNITS
20Hz–100kHz G.823 1.500 0.018 0.035 UIP-P
1.544 2.048
18kHz–100kHz G.823 0.200 0.012 0.025 UIP-P
No bandlimiting TR62411 0.050 0.010 0.020 UIP-P
10Hz–40kHz TR62411 0.025 0.005 0.010 UIP-P
2.048 or
4.096 1.544
8kHz–40kHz TR62411 0.025 0.006 0.012 UIP-P
DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter
5 of 13
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
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0 10 20 30 40 50 60 70 80
JITTER FREQUENCY (kHz)
JITTER GAIN (ns/ns)
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).
DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter
6 of 13
Figure 3-2. Nominal Jitter Transfer for 1.544MHz-to-2.048MHz Conversion
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
2.00
0 5 10 15 20 25 30 35 40
JITTER FREQUENCY (kHz)
JITTER GAIN (ns/ns)
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).
DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter
7 of 13
4. OPERATING PARAMETERS
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground -1.0V to +6.0V
Operating Temperature Range for DS21600SN, DS21602SN, DS21604SN -40°C to +85°C
Storage Temperature Range -55°C to +125°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications
is not implied. Exposure to absolute maximum rating conditions for extended periods can affect device reliability.
RECOMMENDED DC OPERATING CONDITIONS
(TA = -40°C to +85°C)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Logic 1 VIH 2.0 5.5 V
Logic 0 VIL -0.3 +0.8 V
3.3V 3.135 3.3 3.465
Supply Voltage VDD 5V 4.75 5 5.25
V
DC CHARACTERISTICS
(VDD = 3.3V/5V ± 5%, TA = -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current IDD (Note 1) 14 mA
Input Leakage IIL (Note 2) -1.0 +1.0
mA
Output Leakage ILO 1.0 mA
Output Current (2.4V) IOH -1.0 mA
Output Current (0.4V) IOL +4.0 mA
Note 1: 100pF load on all outputs.
Note 2: 0V < VIN < VDD.
DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter
8 of 13
AC TIMING
(Figure 4-1, Figure 4-2, Figure 4-3, Figure 4-4, and Figure 4-5)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Capture Range on CLKIN (Note 3) ±10,000 ppm
Lock Range on CLKIN (Note 3) ±10,000 ppm
CLKIN Duty Cycle (Note 3) 35 65 %
SYNCIN Setup to CLKIN Rising tSU 46 ns
SYNCIN Hold After CLKIN Rising tHI 30 ns
SYNCIN Pulse Width tPW 76 CLKIN
period ns
3.3V -15 0 +15
CLKOUT1 Delay from CLKIN Rising tD 5V -15 0 +31
ns
CLKOUT1 Duty Cycle CD 49 51 %
SYNCOUT Delay from CLKOUT2 tDF -5 30 ns
SYNCOUT Pulse Width tSPW CLKOUT
1 period ns
CLKOUT1 Delay from CLKOUT2
Rising tDH -15 0 +15 ns
3.3V 60 Rise/Fall Time on CLKIN, SYNCIN
(Note 3) tRF 5V 40
ns
3.3V 60
Rise/Fall Time on CLKOUT,
SYNCOUT, CLKOUT2 (Note 4) tRF 5V 40
ns
Note 3: Guaranteed by design.
Note 4: 100pF load on CLKOUT, SYNCOUT, CLKOUT.
Figure 4-1. DS21600/DS21602 High-to-Low Frequency Conversion Frame-Sync
Alignment
tPW tD
CLKOUT2
(
6.176MHz
)
tDF
tDH
tHI
tSU
CLKOUT1
(
1.544MHz
)
SYNCIN
CLKIN
(
2.048MHz
)
SYNCOUT tSPW
DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter
9 of 13
Figure 4-2. DS21604 High-To-Low Frequency Conversion Frame-Sync Alignment
Figure 4-3. DS21600 Low-to-High Frequency Conversion Frame-Sync Alignment
SYNCOUT
tDH
tD
tPW
tHI
tSU
CLKOUT1
(
1.544MHz
)
SYNCIN
CLKIN
(
4.096MHz
)
tDF
CLKOUT2
(
6.176MHz
)
tSPW
tSPW
tDH
tDF
tD
tPW
tSU
CLKOUT2
(
6.144MHz
)
SYNCOUT
CLKOUT1
(2.048MHz)
SYNCIN
CLKIN
(1.544MHz)
tHI
DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter
10 of 13
Figure 4-4. DS21602 Low-to-High Frequency Conversion Frame-Sync Alignment
Figure 4-5. DS21604 Low-to-High Frequency Conversion Frame-Sync Alignment
tSP
tDH
tDF
tD
tPW
tSU
CLKOUT2
(
8.192MHz
)
SYNCOUT
CLKOUT1
(2.048MHz)
SYNCIN
CLKIN
(1.544MHz)
tHI
tDH
TSPW
tDF
tD
tPW
tSU
SYNCOUT
CLKOUT1
(4.096MHz)
SYNCIN
CLKIN
(1.544MHz)
tHI
CLKOUT2
(8.192MHz
)
DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter
12 of 13
8-PIN DIP (300 mil)
DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter
13 of 13
6. REVISION HISTORY
REVISION DESCRIPTION
082100 Preliminary release
083100 Added package specifications
090100 Correct operating voltage range
011101 Added mechanical drawing for DIP package
092801 Added jitter specifications and pin list for all packages; added timing diagrams
032002 Updated jitter specifications
032803 Added 3.3V operation specifications
