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DS21610SN+
3.3V/5V Clock Rate Adapter
GENERAL DESCRIPTION The DS21610 is a multirate, low-jitter clock adapter
that converts E-carrier and T-carrier clocks to
multiple PDH carrier clock rates. Two clock outputs
are available that are frequency-locked to the input
clock. The clock outputs along with an 8kHz frame-
sync output can be phase-aligned to a frame-sync
input. The device is backward compatible with the
LXP610 and operates from either a 3.3V or 5V
supply. All modes of operation include a standard
8kHz output.
PIN CONFIGURATION
FEATURES �
Direct Replacement for LXP610SE �
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 28-Pin PLCC � Industrial Temperature Range:
-40°C to +85°C
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE DS21610SN -40°C to +85°C 16 SO
DS21610SN+ -40°C to +85°C 16 SO
DS21610QN -40°C to +85°C 28 PLCC
DS21610QN+ -40°C to +85°C 28 PLCC
+ Denotes a lead-free/RoHS-compliant device.
DS21610
3.3V/5V Clock Rate Adapter TOP VIEW
SO
Dallas
Semiconductor DS21610
DS21610 3.3V/5V Clock Rate Adapter
TABLE OF CONTENTS
1. PIN DESCRIPTION........................................................................................................................3 1.1 COMPATIBILITY WITH LXP610.........................................................................................................................3
2. FUNCTIONAL DESCRIPTION.......................................................................................................5
3. OUTPUT JITTER............................................................................................................................6 3.1 JITTER TRANSFER...........................................................................................................................................6
4. OPERATING PARAMETERS.........................................................................................................8
5. PACKAGE INFORMATION..........................................................................................................13 5.1 16-PIN SO (300 MILS) (56-G4009-001).......................................................................................................13
5.2 28-PIN PLCC (56-G4001-001)....................................................................................................................14
6. REVISION HISTORY....................................................................................................................15
LIST OF FIGURES Figure 1-1. Block Diagram......................................................................................................................4
Figure 3-1. Nominal Jitter Transfer (1.544MHz CLKIN to 2.048MHz CLKOUT1)...................................6
Figure 3-2. Nominal Jitter Transfer (2.048MHz CLKIN to 1.544MHz CLKOUT1)...................................7
Figure 4-1. SYNCIN/CLKIN to CLKOUT1/SYNCOUT and CLKOUT2..................................................10
Figure 4-2. Output Frame-Sync Alignment When CLKOIT2 = 2 x CLKOUT1......................................11
Figure 4-3. Output Frame-Sync Alignment When CLKOUT2 = 3 x CLKOUT1.....................................11
Figure 4-4. Output Frame-Sync Alignment When CLKOIT2 = 4 x CLKOUT1......................................12
Figure 4-5. Output Frame-Sync Alignment When CLKOUT2 = 5 x CLKOUT1.....................................12
LIST OF TABLES Table 1-A. Pin Description......................................................................................................................3
Table 1-B. Pin Name Cross-Reference to LXP610................................................................................3
Table 2-A. Program Pin Functions (SEL = 0).........................................................................................5
Table 2-B. Program Pin Functions (SEL = 1).........................................................................................5
Table 3-A. Output Jitter Specifications, CLKOUT1 = 1.544MHz............................................................6
Table 3-B. Output Jitter Specifications, CLKOUT1 = 2.048MHz............................................................6
DS21610 3.3V/5V Clock Rate Adapter
1. PIN DESCRIPTION
Table 1-A. Pin Description
PIN
PLCC SO NAME TYPE FUNCTION 1 1 P3 Input Program Pin 3. Used to select the various combinations of
clock and sync outputs.
2 2 SYNCOUT Output Synchronization Pulse Output. An 8kHz output that can be
synchronized to the clock outputs and SYNCIN (if present).
3–5, 7–9,
11, 12, 17–
19, 21, 23,
25, 26
3, 6, 11 N.C. — No Connection
6 4 CLKOUT2 Output Clock Output 2. T1 or E1 carrier clock output referenced to
CLKIN.
10 5 CLKIN Input Clock Input. Reference Clock Input. CLKOUT1 and CLKOUT2
will be referenced to this clock.
13 7 CLKOUT1 Output Clock Output 1. T1 or E1 carrier clock output referenced to
CLKIN.
14 8 P1 Input Program Pin 3. Used to select the various combinations of
clock and sync outputs.
15 9 VSS Supply Ground
16 10 P2 Input Program Pin 2. Used to select the various combinations of
clock and sync outputs.
20 12 SEL Input Clock Mode Select. T-carrier/E-carrier mode select.
22 13 FSP Input Frame Synchronization Pulse Polarity. Used to change the
polarity of the SYNCOUT output.
24 14 SYNCIN Input
Synchronization Pulse Input. Used to synchronize the clock
outputs and SYNCOUT to CLKIN and SYNCIN. SYNCIN
should be tied high or low when not in use.
27 15 P4 Input Program Pin 4. Used to select the various combinations of
clock and sync outputs.
28 16 VDD Supply Positive Supply, 3.3V or 5V ±5%
1.1 Compatibility with LXP610 The DS21610 is pin compatible with the LXP610.
Table 1-B. Pin Name Cross-Reference to LXP610
DS21610 LXP610 FUNCTION P3 P3 Program Pin 3
SYNCOUT FSO Synchronization Pulse Output
CLKOUT2 HFO Clock 2 Output
CLKIN CLKI Clock Input
CLKOUT1 CLKO Clock 1 Output
P1 P1 Program pin 1
VSS GND Ground
P2 P2 Program Pin 2
N.C. N.C. No Connection
DS21610 3.3V/5V Clock Rate Adapter
Figure 1-1. Block Diagram ANALOG
PLL
OUTPUT
DIVIDER
FRAME SYNC
GENERATOR
CLKIN
SEL
SYNCIN
CLKOUT2
CLKOUT1
SYNCOUT
FEEDBACK
CIRCUIT
FREQUENCY
PLL
SELECT
LOGIC
FSP
DS21610
DS21610 3.3V/5V Clock Rate Adapter
2. FUNCTIONAL DESCRIPTION A clock input at CLKIN is converted to various clocks available on CLKOUT1 and CLKOUT2. Additionally, an
8kHz clock locked to CLKIN and SYNCIN (if present) is always available at the SYNCOUT pin. The pulse width of
the SYNCOUT is selectable. It can be one or one-half the clock period of CLKIN, centered on the rising edge of
CLKIN. Pins P1 to P4 are used to select the various clock rates and operational modes. Table 2-A and Table 2-B
list the various operational modes of the DS21610.
CLKIN, CLKOUT1, and CLCKOUT2 are always frequency-locked. They can all be phase-locked to a system
frame-sync pulse. A frame-sync pulse applied to SYNCIN will cause CLKIN and CLKOUT1 and CLKOUT2 to be
phased-locked to that sync pulse. This causes the clocks to have a fixed alignment at the frame-sync boundaries.
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.
Table 2-A. Program Pin Functions (SEL = 0)
P4 P3 P2 P1 CLKIN CLKOUT1 CLKOUT2 SYNCOUT 0 0 0 0 1.544 2.048 6.144 Long
0 0 0 1 3.088 2.048 8.192 Short
0 0 1 0 1.544 2.048 6.144 Long
0 0 1 1 1.544 2.048 8.192 Short
0 1 0 0 1.544 2.560 7.680 Long
0 1 0 1 6.176 4.096 8.192 Long
0 1 1 0 1.544 2.560 7.680 Long
0 1 1 1 6.176 2.048 8.192 Short
1 0 0 0 3.088 2.048 6.144 Long
1 0 0 1 3.088 4.096 8.192 Long
1 0 1 0 3.088 2.048 6.144 Long
1 0 1 1 1.544 4.096 8.192 Long
1 1 0 0 6.176 2.560 7.680 Long
1 1 0 1 6.176 4.096 8.192 Long
1 1 1 0 6.176 2.560 7.680 Long
1 1 1 1 6.176 4.096 8.192 Long
Table 2-B. Program Pin Functions (SEL = 1)
P4 P3 P2 P1 CLKIN CLKOUT1 CLKOUT2 SYNCOUT 0 0 0 0 2.048 3.088 6.176 Long
0 0 0 1 2.048 3.088 6.176 Long
0 0 1 0 2.048 1.544 6.176 Long
0 0 1 1 2.048 1.544 6.176 Long
0 1 0 0 2.560 1.544 7.720 Long
0 1 0 1 8.192 3.088 6.176 Long
0 1 1 0 2.560 1.544 7.720 Long
0 1 1 1 8.192 1.544 6.176 Long
1 0 0 0 2.048 3.088 6.176 Long
1 0 0 1 4.096 3.088 6.176 Long
1 0 1 0 2.048 3.088 6.176 Long
1 0 1 1 4.096 1.544 6.176 Long
1 1 0 0 2.560 1.544 7.720 Long
1 1 0 1 8.192 3.088 6.176 Long
1 1 1 0 2.560 1.544 7.720 Long
1 1 1 1 8.192 1.544 6.176 Long
DS21610 3.3V/5V Clock Rate Adapter
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, CLKOUT1 = 1.544MHz
FREQUENCY BAND TR62411
SPECIFICATION TYP MAX UNITS No bandlimiting TR62411 0.010 0.020 UIP-P
10Hz–40kHz TR62411 0.005 0.010 UIP-P
8kHz–40kHz TR62411 0.006 0.012 UIP-P
Table 3-B. Output Jitter Specifications, CLKOUT1 = 2.048MHz
FREQUENCY BAND G.823
SPECIFICATION TYP MAX UNITS 20Hz–100kHz 1.5 0.018 0.035 UIP-P
18kHz–100kHz 0.2 0.012 0.025 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 (1.544MHz CLKIN to 2.048MHz CLKOUT1)
NOTE: THE TYPICAL PEAK JITTER GAIN OF THE DS21610 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
DS21610 PEAKS IN THE 4kHz TO 8kHz RANGE, WHEREAS THE PEAK JITTER GAIN FOR THE LXP610 SPANS A
GREATER FREQUENCY RANGE (20kHz TO 40kHz).
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
2.00 5 10 1520253035 40
JITTER FREQUENCY (kHz)
JITTER GAIN (ns/ns)DS21610 3.3V/5V Clock Rate Adapter
Figure 3-2. Nominal Jitter Transfer (2.048MHz CLKIN to 1.544MHz CLKOUT1)
NOTE: THE TYPICAL PEAK JITTER GAIN OF THE DS2161 IS ABOUT 1.4 FOR CONVERSION FROM T1 TO E1. THETYPICAL PEAK-JITTER GAIN OF THE LEVEL ONE DEVICE IS ABOUT 1.1. HOWEVER, THE JITTER GAIN FOR THE
DS21610 PEAKS IN THE 4kHz TO 8kHz RANGE, WHEREAS THE PEAK JITTER GAIN FOR THE LXP610 SPANS A
GREATER FREQUENCY RANGE (20kHz TO 40kHz).
0.2
0.4
0.6
0.8
1.2
1.4
1.6
1.8 10 20 3040506070 80
JITTER FREQUENCY (kHz)
JITTER GAIN (ns/ns)DS21610 3.3V/5V Clock Rate Adapter
4. OPERATING PARAMETERS
ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground…………………………………………………………..-1.0V to +6.0V
Operating Temperature Range for DS21610SN………………………………………………………...-40°C to +85°C
Storage Temperature Range……………………………………………………………………………..-55°C to +125°C
Soldering Temperature………………………………………………………See IPC/JEDEC J-STD-020 Specification
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 (Note 1) 2.0 5.5 V
Logic 0 VIL (Note 1) -0.3 +0.8 V
3.3V 3.135 3.3 3.465 Supply Voltage VDD 5V 4.75 5.0 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 2) 14 mA
Input Leakage IIL (Note 3) -10.0 +10.0 µA
Output Leakage ILO µA
Output Current (2.4V) IOH -1.0 mA
Output Current (0.4V) IOL +4.0 mA
