DS26503
T1/E1/J1 BITS Element
www.maxim-ic.com
GENERAL DESCRIPTION
FEATURES
The DS26503 is a building-integrated timing-
supply (BITS) clock-recovery element. The
receiver portion can recover a clock from T1,
E1, and 6312kHz synchronization timing
interfaces. In T1 and E1 modes, the
Synchronization Status Message (SSM) can also
be recovered. The transmit portion can directly
interface to T1 or E1 interfaces as well as source
the SSM in T1 and E1 modes. The DS26503 can
translate between any of the supported inbound
synchronization clock rates to any supported
outbound rate. A separate output is provided to
source a 6312kHz clock. The device is
controlled through a parallel, serial, or hardware
controller port.
CꢀG.703 2048kHz Synchronization Interface
Compliant
CꢀG.703 6312kHz Japanese Synchronization
Interface Compliant
CꢀInterfaces to Standard T1/J1 (1.544MHz) and
E1 (2.048MHz)
CꢀInterface to CMI-Coded T1/J1 and E1
CꢀShort- and Long-Haul Line Interface
CꢀTransmit and Receive T1 and E1 SSM
Messages with Message Validation
CꢀCrystal-Less Jitter Attenuator with Bypass
Mode
CꢀFully Independent Transmit and Receive
Functionality
CꢀInternal Software-Selectable Receive- and
Transmit-Side Termination for
75Ω/100Ω/110Ω/120Ω
CꢀMonitor Mode for Bridging Applications
CꢀAccepts 16.384MHz, 8.192MHz, 4.096MHz,
2.048MHz, or 1.544MHz (T1 Only) Master
Clock
APPLICATIONS
BITS Timing
Rate Conversion
Basic Transceiver
Cꢀ8-Bit Parallel Control Port, Multiplexed or
Nonmultiplexed, Intel or Motorola
CꢀSerial (SPI) Control Port
ORDERING INFORMATION
CꢀHardware Control Mode
PART
TEMP RANGE PIN-PACKAGE
CꢀProvides LOS, AIS, and LOF Indications
Through Hardware Output Pins
CꢀFast Transmitter-Output Disable Through
Device Pin for Protection Switching
CꢀIEEE 1149.1 JTAG Boundary Scan
Cꢀ3.3V Supply with 5V-Tolerant Inputs and
Outputs
DS26503L
0°C to +70°C
64 LQFP
DS26503LN -40°C to +85°C 64 LQFP
Note: 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, click here: www.maxim-ic.com/errata.
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REV: 070904