TMS44165-70DZ

Overview

The TMS44165-70DZ is a Fast Page Mode Dynamic Random Access Memory (DRAM) manufactured by Texas Instruments. It provides a memory density of 256K x 16 bits, organized as 262,144 words of 16 bits each. The device features a 70 nanosecond access time, ensuring high-speed data retrieval for system applications. It utilizes TTL-compatible inputs to interface with standard logic families. The component is housed in a 42-pin Plastic Small Outline J-Lead (SOJ) package, designed for surface-mount technology implementations.

Feature Summary

• Fast Page Mode operation for efficient sequential data access
• TTL-compatible input logic levels for broad compatibility
• High-density 256K x 16 bit storage architecture
• Surface-mount SOJ packaging for compact board integration

Applications

• Computer memory systems requiring fast page mode DRAM
• Embedded systems utilizing Texas Instruments logic families
• Industrial control units needing high-speed volatile storage

Procurement Notes

Verify the specific manufacturer source, as listings may indicate Texas Instruments or Rochester Electronics. Confirm the package type is the 42-pin SOJ variant. Check lifecycle status, as older DRAM components may be discontinued or available only through secondary distributors. Ensure the 70ns speed grade matches system timing requirements before procurement.

Selection Notes

Select this component when a 256K x 16 bit capacity is required with 70ns performance. Compare against the TMS48C138-70DJ if an 8-bit width is sufficient, as it offers similar speed but different organization. Ensure the design supports the 42-pin SOJ footprint and that power consumption constraints align with the device's low-power specifications.

Part Context

This part belongs to the Texas Instruments TMS44 series of Fast Page Mode DRAMs. It serves as a high-density memory solution within the legacy semiconductor portfolio. The series was designed to support early personal computer architectures and embedded controllers requiring reliable, high-speed volatile memory storage with standard logic compatibility.

Replacement Considerations

The TMS48C138-70DJ is a documented alternative from Texas Instruments, offering 128K x 8 bit density at the same 70ns speed. Verify pinout compatibility and voltage requirements before substitution, as the bit-width difference necessitates address/data bus reconfiguration.