DS21610 Clock Rate Adapter www.maxim-ic.com 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 Low-output jitter Multiple output clocks synchronized to input clock 8kHz frequency-locked output for all modes of operation No external components required 16-pin SO and 28-pin PLCC Industrial temperature range: -40C to +85C DALLAS DS21610 ORDERING INFORMATION DS21610SN DS21610QN 16-pin SO -40C to +85C 28-pin PLCC -40C to +85C DESCRIPTION The DS21610 is a multi-rate, 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 phased aligned to a frame sync input. The device is backward compatible to the LXP610 and operates from a single 5V supply. All modes of operation include a standard 8kHz output. 1 of 18 103101 DS21610 TABLE OF CONTENTS 1. FUNCTIONAL DESCRIPTION..................................................................................4 1.1 1.2 PIN FUNCTION DESCRIPTION ...................................................................................5 COMPATIBLITY TO LXP610 ....................................................................................7 2. OPERATION .................................................................................................................8 3. JITTER SPECIFICATIONS ........................................................................................9 4. OPERATING PARAMETERS ..................................................................................11 4.1 TIMING .................................................................................................................12 5. PACKAGE SPECIFICATIONS ...............................................................................16 6. REVISION HISTORY. ..............................................................................................18 2 of 18 DS21610 LIST OF TABLES Table 1-1 PIN DESCRIPTION SORTED BY PIN NUMBER.............................................6 Table 1-2 PIN NAME CROSS REFERENCE TO LXP610 .................................................7 Table 2-1 PROGRAM PIN FUNCTIONS (SEL = 0) ...........................................................8 Table 2-2 PROGRAM PIN FUNCTIONS (SEL = 1) ...........................................................8 Table 3-1 OUTPUT JITTER SPECIFICATIONS, CLKOUT1 = 1.544MHz.......................9 Table 3-2 OUTPUT JITTER SPECIFICATIONS, CLKOUT1 = 2.048MHz.......................9 Table 4-1 AC TIMING ..........................................................................................................12 LIST OF FIGURES Figure 1-1 DS21610 BLOCK DIAGRAM................................................................................................... 4 Figure 3-1 NOMINAL JITTER TRANSFER (1.544MHz CLKIN to 2.048MHz CLKOUT1)................... 9 Figure 3-2 NOMINAL JITTER TRANSFER (2.048MHz CLKIN to 1.544MHz CLKOUT1)................. 10 Figure 4-1 AC TIMING DIAGRAMS ....................................................................................................... 13 Figure 5-1 PACKAGE OUTLINE SO 16 PIN 0.300" BODY................................................................... 16 3 of 18 DS21610 1. 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-P4 are used to select the various clock rates and operational modes. Table 2-1 and Table 2-2 lists 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 will cause 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 will occur within a maximum of 50ms when SYNCIN is 8kHz. DS21610 BLOCK DIAGRAM Figure 1-1 CLKOUT2 CLKIN ANALOG PLL FEEDBACK CIRCUIT OUTPUT DIVIDER SEL FRAME SYNC GENERATOR SYNCIN P1 P2 P3 P4 FREQUENCY PLL SELECT LOGIC 4 of 18 CLKOUT1 SYNCOUT FSP DS21610 1.1 PIN FUNCTION DESCRIPTION Signal Name: CLKIN Signal Description: Clock Input Signal Type: Input Reference Clock Input. CLKOUT1 and CLKOUT2 will be referenced to this clock. Signal Name: CLKOUT1 Signal Description: Clock Output 1 Signal Type: Output T1 or E1 carrier clock output referenced to CLKIN. Signal Name: CLKOUT2 Signal Description: Clock Output 2 Signal Type: Output T1 or E1 carrier clock output referenced to CLKIN. Signal Name: P1 to P4 Signal Description: Program Pins 1 - 4 Signal Type: Input Used to select the various combinations of clock and sync outputs. Signal Name: SEL Signal Description: Clock Mode Select Signal Type: Output T-carrier/E-carrier mode select. Signal Name: SYNCIN Signal Description: Synchronization Input Signal Type: Input Used to synchronize the clock outputs and SYNCOUT to CLKIN and SYNCIN. Signal Name: SYNCOUT Signal Description: Synchronization Output Signal Type: Output An 8kHz output that will be synchronized to the clock outputs and SYNCIN (if present). Signal Name: FSP Signal Description: Frame Synchronization Pulse Polarity Signal Type: Input Used to change the polarity of the SYNCOUT output. Signal Name: Signal Description: Signal Type: 5V 5% VDD Positive Supply Supply Signal Name: Signal Description: Signal Type: Ground Vss Signal Ground Supply 5 of 18 DS21610 PIN DESCRIPTION SORTED BY PIN NUMBER Table 1-1 28-PIN PLCC PIN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 16-PIN SO PIN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PIN NAME TYPE DESCRIPTION P3 SYNCOUT N/C N/C N/C CLKOUT2 N/C N/C N/C CLKIN N/C N/C CLKOUT1 P1 VSS P2 N/C N/C N/C SEL N/C FSP N/C SYNCIN N/C N/C P4 VDD I O O I O I I I I I I - Program Pin 3 Synchronization Pulse Output NO CONNECT NO CONNECT NO CONNECT Clock 2 Output NO CONNECT NO CONNECT NO CONNECT Clock Input NO CONNECT NO CONNECT Clock 1 Output Program Pin 1 Ground Program Pin 2 NO CONNECT NO CONNECT NO CONNECT Clock Mode Select NO CONNECT Frame Sync Polarity NO CONNECT Synchronization Pulse Input NO CONNECT NO CONNECT Program Pin 4 Positive Supply 6 of 18 DS21610 1.2 COMPATIBLITY TO LXP610 The DS21610 is pin-compatible to the LXP610. PIN NAME CROSS-REFERENCE TO LXP610 Table 1-2 DS21610 PIN NAME P3 SYNCOUT CLKOUT2 CLKIN CLKOUT1 P1 VSS P2 N/C SEL FSP SYNCIN P4 VDD LXP610 PIN NAME P3 FSO HFO CLKI CLKO P1 GND P2 N/C SEL FSP FSI P4 VCC DESCRIPTION Program Pin 3 Synchronization Pulse Output Clock 2 Output Clock Input Clock 1 Output Program pin 1 Ground Program Pin 2 NO CONNECT Clock Mode Select Frame Sync Polarity Synchronization Pulse Input Program Pin 4 Positive Supply 7 of 18 DS21610 2. OPERATION PROGRAM PIN FUNCTIONS (SEL = 0) Table 2-1 P4 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 P3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 P2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 P1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 CLKIN 1.544 3.088 1.544 1.544 1.544 6.176 1.544 6.176 3.088 3.088 3.088 1.544 6.176 6.176 6.176 6.176 CLKOUT1 2.048 2.048 2.048 2.048 2.560 4.096 2.560 2.048 2.048 4.096 2.048 4.096 2.560 4.096 2.560 4.096 CLKOUT2 6.144 8.192 6.144 8.192 7.680 8.192 7.680 8.192 6.144 8.192 6.144 8.192 7.680 8.192 7.680 8.192 SYNCOUT LONG SHORT LONG SHORT LONG LONG LONG SHORT LONG LONG LONG LONG LONG LONG LONG LONG CLKOUT2 6.176 6.176 6.176 6.176 7.720 6.176 7.720 6.176 6.176 6.176 6.176 6.176 7.720 6.176 7.720 6.176 SYNCOUT LONG LONG LONG LONG LONG LONG LONG LONG LONG LONG LONG LONG LONG LONG LONG LONG PROGRAM PIN FUNCTIONS (SEL = 1) Table 2-2 P4 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 P3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 P2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 P1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 CLKIN 2.048 2.048 2.048 2.048 2.560 8.192 2.560 8.192 2.048 4.096 2.048 4.096 2.560 8.192 2.560 8.192 CLKOUT1 3.088 3.088 1.544 1.544 1.544 3.088 1.544 1.544 3.088 3.088 3.088 1.544 1.544 3.088 1.544 1.544 8 of 18 DS21610 3. JITTER SPECIFICATIONS OUTPUT JITTER SPECIFICATIONS, CLKOUT1 = 1.544MHz Table 3-1 FREQUENCY BAND TR62411 SPECIFICATION No Bandlimiting 0.050 10Hz to 40kHz 0.025 8kHz to 40kHz 0.025 Note: CLKIN = 2.048MHz OR 4.096MHz TYP 0.002 0.001 0.001 MAX 0.020 0.010 0.012 UNIT UIpp UIpp UIpp OUTPUT JITTER SPECIFICATIONS, CLKOUT1 = 2.048MHz Table 3-2 FREQUENCY BAND 20Hz to 100kHz 18kHz to 100kHz Note: CLKIN = 1.544MHz G.823 SPECIFICATION 1.5 0.2 TYP 0.012 0.008 MAX 0.035 0.025 UNIT UIpp UIpp NOMINAL JITTER TRANSFER (1.544MHz CLKIN to 2.048MHz CLKOUT1) Figure 3-1 2.000 1.600 1.200 0.800 0.400 0.000 Jitter Frequency (kH z) 9 of 18 DS21610 NOMINAL JITTER TRANSFER (2.048MHz CLKIN to 1.544MHz CLKOUT1) Figure 3-2 1.600 1.400 1.200 1.000 0.800 0.600 0.400 0.200 0.000 Jitter Frequency (kHz) 10 of 18 DS21610 4. OPERATING PARAMETERS ABSOLUTE MAXIMUM RATINGS* Voltage Range on Any Pin Relative to Ground Operating Temperature Range for DS21610SN Storage Temperature Range -1.0V to +6.0V -40C to +85C -55C to +125C * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time can affect reliability. (-40C to +85C) RECOMMENDED DC OPERATING CONDITIONS PARAMETER Logic 1 Logic 0 Supply for 5V Operation SYMBOL VIH VIL VDD MIN 2.0 -0.3 4.75 TYP 5 SYMBOL IDD IIL IOH IOL UNITS V V V NOTES (-40C to +85C; VDD = 5.0V 5%) DC CHARACTERISTICS PARAMETER Supply Current @ 5V Input Leakage Output Current (2.4V) Output Current (0.4V) MAX 5.5 +0.8 5.25 MIN TYP -10.0 -1.0 +4.0 NOTES: 1. 0.0V < VIN < VDD. 2. Outputs open. 11 of 18 MAX 8 +10.0 UNITS mA mA mA mA NOTES 2 1 DS21610 4.1 TIMING AC TIMING Table 4-1 PARAMETER Capture Range on CLKIN1 Lock Range on CLKIN1 CLKIN Duty Cycle1 SYNCIN Setup to CLKIN Rising SYNCIN Hold After CLKIN Rising SYNCIN Pulse Width CLKOUT1 Delay From CLKIN Rising CLKOUT1 Duty Cycle SYNCOUT Delay From CLKOUT2 SYNCOUT Pulse Width (Low) CLKOUT1 Delay From CLKOUT2 Rising Rise/Fall Time on CLKIN, SYNCIN1 Rise/Fall Time on CLKOUT, SYNCOUT, CLKOUT2 with a 26pF load 1. Guaranteed by design SYMBOL tSU tHI MIN 10000 10000 35 46 30 tPW tD 76 -15 0 CLKIN period +15 CD tDF 49 -5 - 51 30 tSPW tDH -15 0 tRF - tRF - 12 of 18 TYP - MAX 65 - UNITS ppm ppm % ns ns ns ns % ns CLKOUT1 Period +15 ns ns - 40 ns - 40 ns DS21610 AC TIMING DIAGRAMS Figure 4-1 SYNCIN/CLKIN to CLKOUT1/SYNCOUT and CLKOUT2 CLKIN SINCIN tSU tHI tPW CLKOUT1 tDC CLKOUT1 SYNCOUT tDF tDF tWO CLKOUT2 CLKOUT1 tDH tDH 13 of 18 DS21610 Output Frame Sync Alignment When CLKOUT2 = 2 x CLKOUT1 CLKOUT1 (4.096MHz) CLKOUT2 (8.192MHz) SYNCOUT CLKOUT1 (3.088MHz) CLKOUT2 (6.176MHz) SYNCOUT Output Frame Sync Alignment When CLKOUT2 = 3 x CLKOUT1 CLKOUT1 (2.56MHz or 2.048MHz) CLKOUT2 (7.680MHz or 6.144MHz) SYNCOUT 14 of 18 DS21610 Output Frame Sync Alignment When CLKOUT2 = 4 x CLKOUT1 CLKOUT1 (1.544MHz or 2.048MHz) CLKOUT2 (6.176MHz or 8.192MHz) SYNCOUT (short) SYNCOUT (long) Output Frame Sync Alignment When CLKOUT2 = 5 x CLKOUT1 CLKOUT1 (1.544MHz) CLKOUT2 (7.720MHz) SYNCOUT 15 of 18 DS21610 5. PACKAGE SPECIFICATIONS PACKAGE OUTLINE SO 16-PIN 0.300 BODY Figure 5-1 16 of 18 DS21610 PACKAGE OUTLINE PLCC 28-PIN PACKAGE Figure 5-2 LTR A A1 A2 B B1 C D D1 D2 E E1 E2 L1 N E1 Ch1 MIN 0.165 0.090 0.02 0.026 0.013 0.009 0.485 0.450 0.390 0.485 0.450 0.390 0.060 28 0.050 0.042 MAX 0.180 0.120 0.033 0.021 0.012 0.495 0.456 0.430 0.495 0.456 0.430 BSC 0.048 17 of 18 DS21610 6. REVISION HISTORY 1. 2. 3. 4. 5. Preliminary release, 090100. Remove references to 3V operation, 112700. Add FSP pin to block diagram, 120600. Add mechanical drawings for PLCC package, 021501. Added jitter specifications and pinout for all packages, 060601. 6. Added timing diagrams, 082001. 18 of 18