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REV: 113004

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may be simultaneously available through various sales channels. For information about device errata, click here:

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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 Adapter

www.maxim-ic.com

Dallas

Semiconductor

DS21600/2/4

TOP VIEW

DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter

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TABLE OF CONTENTS

PIN DESCRIPTION ......................................................................................................................3

1.1

AME

ROSS

-R

EFERENCE TO

LXP60X ....................................................................................................3

FUNCTIONAL DESCRIPTION......................................................................................................4

2.1

ODE

ELECT

................................................................................................................................................4

2.2

RAME

YNC

NPUT

........................................................................................................................................4

OUTPUT JITTER ..........................................................................................................................4

3.1

ITTER

RANSFER

..........................................................................................................................................5

OPERATING PARAMETERS .......................................................................................................7

PACKAGE INFORMATION ........................................................................................................11

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

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1. PIN DESCRIPTION

Table 1-A. Pin Description

PIN

DIP SO

NAME TYPE

FUNCTION

1, 3, 6, 8, 10,

11, 13, 15

N.C. --

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

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

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

GND

Ground

SEL

Clock Mode Select

SYNCIN

FSI

Synchronization Pulse Input

N.C. N.C.

Connect

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

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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 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

20Hz100kHz G.823 1.500

0.018

0.035

P-P

1.544 2.048

18kHz100kHz G.823 0.200

0.012

0.025

P-P

No bandlimiting

TR62411

0.050

0.010

0.020

P-P

10Hz40kHz TR62411 0.025

0.005

0.010

P-P

2.048 or

4.096

1.544

8kHz40kHz TR62411 0.025

0.006

0.012

P-P

DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter

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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

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

JITTER FREQUENCY (kHz)

J
I
TTE

R 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

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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

JITTER FREQUENCY (kHz)

J
I
TTE

R 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

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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

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

= -40°C to +85°C)

PARAMETER SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Logic 1

2.0 5.5 V

Logic 0

-0.3 +0.8 V

3.3V

3.135 3.3 3.465

Supply Voltage

5V 4.75

5.25

DC CHARACTERISTICS

= 3.3V/5V

± 5%, T

= -40°C to +85°C.)

PARAMETER SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Current

(Note

14 mA

Input Leakage

(Note

-1.0 +1.0

Output Leakage

1.0

Output Current (2.4V)

-1.0 mA

Output Current (0.4V)

+4.0 mA

Note 1: 100pF load on all outputs.
Note 2: 0V < V

< V

DS21600/DS21602/DS21604 3.3V/5V Clock Rate Adapter

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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

±10,000

ppm

Lock Range on CLKIN

(Note

±10,000

ppm

CLKIN Duty Cycle

(Note

35 65

SYNCIN Setup to CLKIN Rising

SYNCIN Hold After CLKIN Rising

SYNCIN Pulse Width

CLKIN

period

3.3V -15

+15

CLKOUT1 Delay from CLKIN Rising

5V -15

+31

CLKOUT1 Duty Cycle

49 51

SYNCOUT Delay from CLKOUT2

-5

30 ns

SYNCOUT Pulse Width

SPW

CLKOUT

1 period

CLKOUT1 Delay from CLKOUT2
Rising

-15

+15 ns

3.3V

Rise/Fall Time on CLKIN, SYNCIN
(Note 3)

3.3V

Rise/Fall Time on CLKOUT,
SYNCOUT, CLKOUT2 (Note 4)

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

CLKOUT2
(6.176MHz)

CLKOUT1
(1.544MHz)

SYNCIN

CLKIN
(2.048MHz)

SYNCOUT

SPW

Document Outline

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: DS21600SN

Document Outline

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: DS21600SN