ABRIDGED DATA SHEET 19-6003; Rev 0; 8/11 MAX24188 Low-Cost IEEE 1588 Clock General Description The MAX24188 is a flexible, low-cost IEEE 1588 clock designed to be the central 1588 time base in a multiport system. In such systems (typically boundary clocks or transparent clocks) timestampers at the ports must all have a common time and frequency reference. The MAX24188 serves as that common reference. As the system exchanges 1588 packets with an external 1588 master and calculates its time offset vs. the master, the MAX24188 can be adjusted by system software to zero out the time offset and thereby achieve time and frequency synchronization with the master. As the MAX24188 is adjusted, its output frequency and time alignment signals are correspondingly adjusted. All timestampers (and other time-aware components) that receive those signals then follow the adjustment to maintain synchronization with the MAX24188. In this way all 1588 elements in the system maintain a common sense of time and frequency. Highlighted Features ♦ Complete Hardware Support for IEEE 1588 ♦ Flexible Block for Any 1588 Architecture ♦ Enables Ordinary, Boundary, and Transparent Clocks ♦ Steered by Software to Follow an External 1588 Master ♦ 2-8ns Time Resolution and 2-32ns Period Resolution ♦ 1ns Input Timestamp Accuracy and Output Edge Placement Accuracy ♦ Three Time/Frequency Controls: Direct Time Write, Time Adjustment, and High-Resolution Frequency Adjustment ♦ Programmable Clock and Time-Alignment I/O to Synchronize All 1588 Elements in the System ♦ Can Provide an Output Clock Signal to Slave Components (125MHz/N, 1 ≤ N ≤ 255) ♦ Can Provide an Output Time Alignment Signal to Slave Components (e.g., 1PPS) ♦ Can Frequency-Lock to an Input Clock Signal from Elsewhere in the System ♦ Can Timestamp an Input Time Alignment Signal to Time-Lock to a Master Elsewhere in the System (e.g., 1PPS) ♦ Input Event Timestamper Detects Incoming Time Alignment (e.g., 1PPS) or Clock Edges, Can Timestamp Rising and/or Falling Edges ♦ Flexible Programmable Event Generator (PEG) Can Output 1PPS (One Pulse per Period) or a Wide Variety of Clock Signals ♦ Built-In Support for Telecom Equipment Timing Architectures with Dual Redundant Timing Cards ♦ Full Support to Enable Switches and Routers to Be Transparent Clocks and/or Boundary Clocks ♦ Full Support for 1588 and Synchronous Ethernet ♦ Operates from a 10MHz, 12.8MHz, 25MHz, or 125MHz Reference Clock ♦ SPI™ Processor Interface ♦ 1.2V Operation with 3.3V I/O The MAX24188 can be a standalone central timing function for 1588 systems. It can also be used in conjunction with one of Maxim’s clock synchronization ICs in multimode systems designed to be clocked by 1588, 1588 plus frequency (such as synchronous Ethernet), or frequency only. Applications Central Time-Clock for 1588-Enabled Equipment with Timestamping on Multiple Ports Wireless Base Stations and Controllers Switches, Routers, DSLAMs, PON Equipment Pseudowire Circuit Emulation Equipment Test and Measurement Systems Medical, Industrial, and Factory Automation Equipment Ordering Information PART MAX24188ETK+ TEMP RANGE PIN-PACKAGE -40°C to +85°C 68 TQFN-EP* +Denotes a lead-free/RoHS-compliant package. *EP = Exposed pad. SPI is a trademark of Motorola, Inc. _________________________________________________________ Maxim Integrated Products 1 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, go to: www.maxim-ic.com/errata. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ABRIDGED DATA SHEET MAX24188 Application Examples Example 1: Multiport System with Central 1588 Software TS Ethernet Ports TS Central Switching Function Line Card 1 Example: MAX24288 Line Card N TS Ethernet Ports TS Example: DS31400. Optional. Can provide holdover, clock selection and frequency translation. Processor 1588 SW Clock Sync Function MAX24188 1588 Clock Optional: 1PPS from GPS receiver system clock e.g. 25MHz 1588 time alignment, e.g. 1 PPS Example 2: Multiport System with Distributed 1588 Software TS Ethernet Ports Line Card 1 TS Line Card N Central Switching Function uP 1588 SW Example: MAX24288 uP 1588 SW TS Ethernet Ports TS Example: DS31400. Optional. Can provide holdover, clock selection and frequency translation. Processor 1588 SW Clock Sync Function MAX24188 1588 Clock Optional: 1PPS from GPS receiver system clock e.g. 25MHz 1588 time alignment, e.g. 1 PPS Block Diagram MAX24188 Reference Clock PLL 125MHz, 8 phases TS2 PEG2 PEG1 TS3 Time Stamper Prog. Event Generator Prog. Event Generator Time Stamper Output Clock Generator REFCLK 125MHz 1588 Time Engine GPIO7 GPIO6 GPIO5 GPIO4 GPIO3 GPIO2 GPIO Control GPIO1 TS1 Time Stamper JTAG JTCLK JTMS JTDI JTDO JTRST_N Control and Status GPO1 CS_N SCLK SDI SDO time GPO2 RST_N Note to readers: This document is an abridged version of the full data sheet. To request the full data sheet, go to www.maxim-ic.com/MAX24188 and click on Request Full Data Sheet. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. M a x i m I n t e g r a t e d P r o d u c t s , 1 2 0 S a n G a b r i e l D r iv e , S u n n y v a le , C A 9 4 0 8 6 4 0 8- 7 3 7 - 7 6 0 0 2011 Maxim Integrated Products 2 Maxim is a registered trademark of Maxim Integrated Products.