TP3155V

Telecom Overview

The TP3155V is a monolithic CMOS Time Slot Assignment Circuit (TSAC) designed to generate transmit and receive frame synchronization pulses for up to eight COMBO CODEC/Filter devices. It supports frames with up to 32 time slots, allowing independent assignment of each pulse via an 8-bit serial control word loaded through a simple interface compatible with TP3020/TP3021 and 2910/2911 CODECs. The device operates on a single 5V supply with a typical power dissipation of 5 mW. It features LS TTL and CMOS compatible inputs and provides two operating modes: Mode 1 allows separate transmit and receive assignments, while Mode 2 supports 8-channel unidirectional operation or synchronized transmit/receive assignments.

Telecom Feature Summary

• Generates independent transmit and receive frame sync pulses for up to 8 channels
• Supports flexible time slot assignment within frames of up to 32 slots
• Features a serial control interface compatible with standard TP3020/TP3021 CODECs
• Offers dual operating modes for separate or unified transmit/receive synchronization

Telecom Applications

• Synchronous line card applications in telecommunications systems
• Time slot assignment for COMBO CODEC/Filter arrays
• Frame synchronization generation for digital audio processing interfaces

Telecom Procurement Notes

Verify the package type matches the required footprint, as the V suffix denotes a Plastic Chip Carrier (PCC) package. Confirm that the system design accommodates the specific timing requirements for setup and hold times relative to the control clock. Ensure the application environment remains within the specified ambient temperature range of -25°C to +125°C for reliable operation.

Telecom Selection Notes

Select this component when interfacing with National Semiconductor COMBO CODEC/Filters such as the TP3052 series or TP3064 series. Choose Mode 1 if distinct time slots are required for transmit and receive directions per channel. Choose Mode 2 if all outputs must be assigned relative to the transmit sync signal or for unidirectional data flow configurations.

Telecom Part Context

The TP3155 is part of the COMBO family ecosystem developed by National Semiconductor, now Texas Instruments. It serves as a specialized controller for managing frame synchronization in PCM-based communication systems. It complements other components like the TP3020/TP3021 CODECs by handling the complex timing logic required for multi-channel asynchronous data transmission.

Telecom Replacement Considerations

The datasheet lists the TP3155N as the Dual-In-Line variant of the same circuit. No alternative part numbers from other manufacturers are documented in the provided source material.