Features: ` Accepts 8kHz and 19.44MHz References in Addition to T1, E1, and 64kHz Composite Clock
` GR378 Composite Clock Compliant
` G.703 2048kHz Synchronization Interface Compliant
` G.703 64kHz Option A & B Centralized Clock Synchronization Interface Compliant
` G.703 64kHz Japanese Composite Clock Synchronization Interface Compliant
` G.703 6312kHz Japanese Synchronization Interface Compliant
` Interfaces to Standard T1/J1 (1.544MHz) and E1 (2.048MHz)
` Interface to CMI-Coded T1/J1 and E1
` T1/E1 Transmit Payload Clock Output
` Short- and Long-Haul Line Interface
` Transmit and Receive T1 BOC SSM Messages with Receive Message Change of State and Validation Indication
` Transmit and Receive E1 Sa(n) Bit SSM Messages with Receive Message Change of State Indication
` Crystal-Less Jitter Attenuator with Bypass Mode for T1 and E1 Operation
` Fully Independent Transmit and Receive Functionality
` Internal Software-Selectable Receive and Transmit Side Termination for 75/100/110/120/133
` Monitor Mode for Bridging Applications
` Accepts 16.384MHz, 12.8MHz, 8.192MHz,4.096MHz, 2.048MHz, or 1.544MHz Master Clock
` 64kHz, 8kHz, and 400Hz Outputs in Composite Clock Mode
` 8-Bit Parallel Control Port, Multiplexed or Nonmultiplexed, Intel or Motorola
` Serial (SPI) Control Port and Hardware Control Mode
` Provides LOS, AIS, and LOF Indications through Hardware Output Pins
` Fast Transmitter Output Disable through Device Pin for Protection Switching
` IEEE 1149.1 JTAG Boundary Scan
` 3.3V Supply with 5V Tolerant Inputs and Outputs
` Pin and Software Compatible with the DS26502 and DS26503
Application·BITS Timing
·Rate ConversionSpecificationsVoltage Range on Any Pin Relative to Ground.......-1.0V to +6.0V
Operating Temperature Range for DS26504L ........0 to +70
Operating Temperature Range for DS26504LN .......-40 to +85
Storage Temperature Range...............-55 to +125
Soldering Temperature........See IPC/JEDEC J-STD-20 Specification
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 reliabilityDescriptionThe 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
DS26504 Data Sheet
