DS21600 ,Clock Rate AdapterFEATURES The DS21600/DS21602/DS21604 are multiple-rate Direct Drop-In Replacement for LXP600ASE, ..
DS21600N ,3.3 V/5 V clock rate adapterPin Description PIN NAME TYPE FUNCTION DIP SO 1, 3, 6, 8, 10, N.C. No Connect 11, 13, 15 Synchr ..
DS21600N ,3.3 V/5 V clock rate adapterFEATURES The DS21600/DS21602/DS21604 are multiple-rate Direct Drop-In Replacement for LXP600ASE, ..
DS21600N+ ,3.3V/5V Clock Rate AdapterPin Description...3 Table 1-B. Pin Name Cross-Reference to LXP60x..3 Table 2-A. Frequency Conversio ..
DS21600SN ,3.3 V/5 V clock rate adapterBlock Diagram........3 Figure 3-1. Nominal Jitter Transer for 2.048MHz to 1.544MHz Conversion ..... ..
DS21600SN+ ,3.3V/5V Clock Rate AdapterBlock Diagram...3 Figure 3-1. Nominal Jitter Transer for 2.048MHz to 1.544MHz Conversion5 Figure 3- ..
DS21600
Clock Rate Adapter
DS21600/DS21602/DS21604
3.3V/5V Clock Rate Adapter
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
DS21600SN+ -40°C to +85°C 16 SO
DS21600N -40°C to +85°C 8 DIP
DS21600N+ -40°C to +85°C 8 DIP
DS21602SN -40°C to +85°C 16 SO
DS21602SN+ -40°C to +85°C 16 SO
DS21602N -40°C to +85°C 8 DIP
DS21602N+ -40°C to +85°C 8 DIP
DS21604SN -40°C to +85°C 16 SO
DS21604SN+ -40°C to +85°C 16 SO
DS21604N -40°C to +85°C 8 DIP
DS21604N+ -40°C to +85°C 8 DIP
+ Denotes a lead(Pb)-free/RoHS-compliant device.
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
Dallas
Semiconductor DS21600/2/4
TOP VIEW
SO
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............................................................................................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
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 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/L
XP604 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 VCC 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
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
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
1.8
JITTER GAIN (ns/ns) 1.6 1.4 1.2 0.8 0.6 0.4 0.2 0 0 10 20 70 3040506080JITTER 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).
Figure 3-2. Nominal Jitter Transfer for 1.544MHz-to-2.048MHz Conversion
2.00
1.80
1.60
JITTER GAIN (ns/ns)
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00 5 10 35 1520253040
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).
