IS42S16400D-6BL

Memory IC Overview

The IS42S16400D-6BL is a 64Mb Synchronous DRAM manufactured by ISSI. It features a 16-bit data bus width and operates at clock frequencies of 166 MHz or 143 MHz. The device is organized as 4 Meg x 16 bits across four internal banks. It utilizes a single 3.3V power supply with an LVTTL interface. The component supports programmable burst lengths, CAS latencies of 2 or 3 clocks, and includes self-refresh capabilities. It is available in a 60-ball fBGA package.

Memory IC Feature Summary

• Supports fully synchronous operation with all signals referenced to the positive clock edge.
• Features internal bank architecture to hide row access and precharge times for improved performance.
• Includes programmable burst lengths (1, 2, 4, 8, full page) and selectable sequential/interleave sequences.
• Provides self-refresh modes and power-down modes to reduce system power consumption.

Memory IC Applications

• High-speed data transfer systems requiring pipeline architecture
• Embedded memory systems operating on 3.3V platforms
• Applications requiring interleaved bank access for seamless random-access operations

Memory IC Procurement Notes

Verify the specific suffix '6BL' against the manufacturer's datasheet to confirm the exact package type and temperature range. Ensure compatibility with LVTTL logic levels and 3.3V supply requirements. Confirm that the 60-ball fBGA footprint matches the target PCB design. Check for lead-free compliance if required by environmental regulations.

Memory IC Selection Notes

Select this component when a 64Mb capacity with a 16-bit interface is required. It is suitable for designs needing high-speed synchronous access up to 166 MHz. Consider the 60-ball fBGA package constraints. Verify that the system can support the necessary refresh cycles and power management states defined in the mode register.

Memory IC Part Context

This part belongs to the IS42S16400 series of 64Mb SDRAMs from ISSI. The series offers various package options including TSOP II and FBGA. The 'D' designation typically indicates industrial temperature availability within this product line. The device is designed for general-purpose high-density memory applications.

Memory IC Replacement Considerations

Check for other suffixes in the IS42S16400 family, such as those indicating different packages like TSOP II or different temperature grades. Ensure any substitute maintains the 16-bit width and 64Mb density. Verify pinout compatibility for the specific package variant selected.

Memory IC FAQ

How does the IS42S16400D handle row precharging during burst operations?

It supports an Auto Precharge function where the row is automatically precharged at the end of a READ or WRITE burst if A10 is set HIGH during the command.

What is the role of the LDQM and UDQM pins?

LDQM and UDQM control the lower and upper bytes of the I/O buffers, allowing byte-level masking for both read and write operations.