IS42S81600D-7TL

Memory IC Overview

The IS42S81600D-7TL is a 128 Mbit Synchronous DRAM manufactured by ISSI. It features an 8-bit data bus width and supports clock frequencies up to 143 MHz. The device is organized as 32 Meg x 8 and housed in a 54-pin TSOP-II package. Key timing parameters include a CAS latency of 3 clocks with an access time of 5.4 ns, or CAS latency of 2 clocks with an access time of 6.5 ns. It operates on a single 3.3V power supply for both VDD and VDDQ.

Memory IC Feature Summary

• Fully synchronous interface where all signals are referenced to the positive clock edge.
• Internal quad-bank architecture allows hiding row access and precharge times through interleaving.
• Supports programmable burst lengths including sequential and interleaved sequences.
• Includes auto-refresh and self-refresh modes for power management.

Memory IC Applications

• High-speed data transfer systems utilizing pipeline architecture
• Memory systems requiring 3.3V operation with LVTTL interfaces
• Applications needing bank interleaving for seamless random-access operations

Memory IC Procurement Notes

Verify the specific speed grade suffix matches the required clock frequency, as the -7 designation corresponds to 143 MHz operation. Confirm that the 54-pin TSOP-II package aligns with the target PCB footprint. Ensure the design accommodates the 3.3V voltage requirements for both internal logic and I/O buffers. Check for any lead-free availability options if environmental compliance is mandatory for the end product.

Memory IC Selection Notes

Select this component when a 128 Mbit density with an 8-bit bus width is required. The -7 speed grade provides a balance between performance and power consumption at 143 MHz. Consider the internal bank structure if the application benefits from overlapping row activations. Verify that the system controller supports the necessary command set, including auto-precharge and burst termination features defined in the mode register.

Memory IC Part Context

This part belongs to the IS42S81600D/IS42S16800D series of 128Mb SDRAMs. It shares architectural similarities with the IS42S16800D but differs in data bus width and organization. The series utilizes a CMOS process designed for high-speed operation within standard 3.3V memory systems. It is distinct from lower density or wider bus variants within the broader ISSI SDRAM portfolio.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.