DS26504
T1/E1/J1/64KCC BITS Element
www.maxim-ic.com
Cꢀ Transmit and Receive T1 BOC SSM Messages
with Receive Message Change of State and
Validation Indication
GENERAL DESCRIPTION
The DS26504 is a building-integrated timing-supply
(BITS) clock-recovery element. It also functions as a
basic T1/E1 transceiver. The receiver portion can
recover a clock from T1, E1, 64kHz composite clock
(64KCC), 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, E1, or
64KCC synchronization interfaces as well as source
the SSM in T1 and E1 modes. The DS26504 can
translate between any of the supported inbound
synchronization clock rates to any supported
outbound rate. The DS26504 can also accept an 8kHz
as well as a 19.44MHz reference clock. A separate
output is provided to source a 6312kHz clock. The
device is controlled through a parallel, serial, or
hardware controller port.
Cꢀ Transmit and Receive E1 Sa(n) Bit SSM
Messages with Receive Message Change of State
Indication
Cꢀ Crystal-Less Jitter Attenuator with Bypass Mode
for T1 and E1 Operation
Cꢀ Fully Independent Transmit and Receive
Functionality
Cꢀ Internal Software-Selectable Receive and
Transmit Side Termination for
75Ω/100Ω/110Ω/120Ω/133Ω
Cꢀ Monitor Mode for Bridging Applications
Cꢀ Accepts 16.384MHz, 12.8MHz, 8.192MHz,
4.096MHz, 2.048MHz, or 1.544MHz Master
Clock
Cꢀ 64kHz, 8kHz, and 400Hz Outputs in Composite
Clock Mode
Cꢀ 8-Bit Parallel Control Port, Multiplexed or
Nonmultiplexed, Intel or Motorola
Cꢀ Serial (SPI) Control Port and Hardware Control
Mode
APPLICATIONS
BITS Timing
Rate Conversion
Cꢀ Provides LOS, AIS, and LOF Indications through
Hardware Output Pins
FEATURES
Cꢀ Fast Transmitter Output Disable through Device
Pin for Protection Switching
Cꢀ Accepts 8kHz and 19.44MHz References in
Addition to T1, E1, and 64kHz Composite Clock
Cꢀ GR378 Composite Clock Compliant
Cꢀ G.703 2048kHz Synchronization Interface
Compliant
Cꢀ IEEE 1149.1 JTAG Boundary Scan
Cꢀ 3.3V Supply with 5V Tolerant Inputs and
Outputs
Cꢀ Pin and Software Compatible with the DS26502
and DS26503
Cꢀ G.703 64kHz Option A & B Centralized Clock
Synchronization Interface Compliant
Cꢀ G.703 64kHz Japanese Composite Clock
Synchronization Interface Compliant
Cꢀ G.703 6312kHz Japanese Synchronization
Interface Compliant
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
Cꢀ Interfaces to Standard T1/J1 (1.544MHz) and E1
(2.048MHz)
DS26504L
0°C to +70°C
64 LQFP
Cꢀ Interface to CMI-Coded T1/J1 and E1
Cꢀ T1/E1 Transmit Payload Clock Output
Cꢀ Short- and Long-Haul Line Interface
DS26504LN -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: 070105
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