_________________________________________________________ Maxim Integrated Products 1
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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.
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 TEMP RANGE PIN-PACKAGE
MAX24188ETK+
-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.
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
-8
ns Time Resolution and 2
-32
ns 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
