Features: Complete ISDN PBX 2-Wire Data Transceiver including:
` 2 B plus D channel interface for PBX UÊ Interface
` 144 kb/s full-duplex on 1 twisted pair using Burst Mode
` Loop range up to 6 kft ( 24AWG)
` Alternate Mark Inversion coding with transmit filter and scrambler for low emi radiation
` Adaptive line equalizer
` On-chip timing recovery , no external components
` Standard TDM interface for B channels
` Separate interface for D channel
` 2.048 MHz master clock
` Driver for line transformer
` 4 loop-back test modes
` Single +5V supply
` MICROWIRETM compatible serial control interface
` Applications in: PBX Line Cards Terminals Regenerators
` Available in both 20-pin DIP and 28-pin PLCCPinout
SpecificationsIf Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications.
VCC to GND.............................. 7V
Voltage at Li, Lo ....................VCC+1V to VSS-1V
Voltage at any Digital Input.............. VCC+1V to VSS-1V
Storage Temperature Range............. -65°C to +150°C
Current at Lo......................... ± 100 mA
Current at any Digital Output ..................± 50 mA
Lead Temperature (Soldering, 10 sec.) ..............300°C
ESD (Human Body Model) .....................2000V
DescriptionThe TP3401, TP3402 and TP3403 are complete monolithic transceivers for data transmission on twisted pair subscriber loops. TP3401, TP3402 and TP3403 are built on National's double poly microCMOS process, and require only a single +5 Volt supply. Alternate Mark Inversion (AMI) line coding, in which binary `1's are alternately transmitted as a positive pulse then a negative pulse, is used to ensure low error rates in the presence of noi e with lower emi radiation than other codes such as Biphase (Manchester).
Full-duplex transmission at 144 kb/s is achieved on a single twisted wire pair using a burst-mode technique (Time Compression Multiplexed). Thus the TP3401, TP3402 and TP3403 device operates as an ISDN `U' Interface for short loop applications, typically in a PBX environment, providing transmission for 2 B channels and 1 D channel. On 24 cable, the range is at least 1.8 km (6k ft).
System timing is based on a Master/Slave configuration, with the line card end being the Master which controls loop timing and synchronisation. All timing sequences of TP3401, TP3402 and TP3403 necessary for loop activation and de-activation are generated on-chip. Selection of Master and Slave mode operation is programmed via the Microwire Control Interface. A 2.048 MHz clock, which may be synchronized to the system clock, controls all transmission-related timing functions.For the TP3401, this clock must be provided from an external source; the TP3402 includes an oscillator circuit requiring an external crystal. The TP3403 includes the functions of both the TP3401 and the TP3402.
TP3401 Data Sheet
