Renesas Electronics America Inc IDT71T75802S100PFI8

Overview of IDT71T75802S100PFI8 Synchronous ZBT SRAM Product

The IDT71T75802S100PFI8, manufactured by Renesas Electronics Corporation, is an 18Mbit (1,048,576 x 18-bit or 524,288 x 36-bit) synchronous static RAM (SRAM) designed for high-speed, high-reliability memory applications. Integrating Zero Bus Turnaround (ZBT™) architecture, it eliminates dead bus cycles between read and write operations, offering superior efficiency for bandwidth-critical designs. The device operates with a 2.5V core and I/O supply and comes in a 100-pin Thin Quad Flat Pack (TQFP), supporting clock rates up to 200 MHz for select speed grades.

Main Highlights of the IDT71T75802S100PFI8

The IDT71T75802S100PFI8 stands out with its robust feature set, catering to the requirements of advanced networking, telecommunications, and embedded control systems. Key attributes include:

Dual memory configurations: 512K x 36-bit and 1M x 18-bit.

High clock speeds up to 200 MHz (with 3.2 ns clock-to-data access time).

True ZBT™ operation, ensuring zero dead cycles on bus turnarounds.

Fully synchronous (SDR) operation; address, data, and control signals are registered on the positive clock edge for predictable timing.

Single READ/WRITE control and individual byte write enables enhance design flexibility.

Internally synchronized output buffer enable, easing control logic.

Pipelined outputs support multi-stage system architectures.

4-word burst capability with selectable linear or interleaved addressing via the LBO control.

Three chip enable inputs to facilitate straightforward memory bank expansion.

JTAG IEEE 1149.1-compliant boundary scan interface for board-level testability.

Wide operating temperature range (industrial: -40°C to +85°C) supports deployment in varied environments.

These features position the IDT71T75802S100PFI8 as a premier solution for systems requiring deterministically fast, parallel-access SRAM.

Common Uses and Engineering Scenarios for the IDT71T75802S100PFI8

The IDT71T75802S100PFI8 is engineered for applications where high-throughput, low-latency memory is essential. Examples include:

Switch and router packet buffers in telecom/datacom infrastructure – its ZBT™ support ensures continuous data availability during high-speed transfers.

Video processing and imaging systems that require pipelined, deterministic frame buffering.

Industrial control and automation platforms where consistent cycle times and robust operation are critical.

Data acquisition modules with burst read/write capabilities for real-time processing.

FPGA and ASIC-based designs necessitating glue-less high-speed synchronous RAM.

The ability to offer both interleaved and linear burst read/write sequences enables optimization for diverse memory-access patterns in these use cases.

Operational and Design Details of the IDT71T75802S100PFI8

The architectural heart of the IDT71T75802S100PFI8 is its pipelined, fully registered synchronous interface and ZBT™ logic. Address, data, and control signals are latched on the rising edge of the clock, allowing for reliable multi-device operation in high-frequency, pipelined systems.

ZBT™ architecture removes dead cycles by permitting immediate bus turnarounds from read to write or vice versa—essential in multi-port RAM topologies and systems with tightly interleaved processing. Internal burst counters facilitate four-word burst accesses, with the sequence determined by the LBO (Linear Burst Order) input.

The chip’s three-chip-enable scheme allows for scalable expansion, and individual byte write signals allow parallel updates to individual bytes (36-bit configuration) or full words (18-bit configuration). For low-power operation, a ZZ input supports power-down.

Pin Configuration and Package Information for the IDT71T75802S100PFI8

The IDT71T75802S100PFI8 is available in a 100-pin TQFP package (14x14 mm), with clearly defined pinouts for both 512K x 36 and 1M x 18 configurations. Key considerations for layout include:

I/O, address, and control pins are grouped for straightforward signal routing.

JTAG test access port (TAP) signals—including TMS, TDI, TCK, and optional TRST—enable comprehensive boundary-scan testing and can be disabled for normal system operation.

Separate power connections for core (VDD) and I/O (VDDQ) facilitate noise management in high-frequency designs.

Multiple chip enables and byte write controls are easily accessible for advanced banking and masking schemes.

The device is also offered in a 119-ball BGA for alternate PCB design requirements.

Maximum Limits and Recommended Conditions for Operating IDT71T75802S100PFI8

Ensuring reliability and robust operation, the IDT71T75802S100PFI8 specifies the following:

5V ± 5% power supply and I/O voltage ranges.

Commercial (0°C to +70°C) and industrial (-40°C to +85°C) temperature range options.

All signals must be kept within ratings to prevent device degradation.

Power sequencing is not mandatory, but no input or I/O should exceed the operating supply voltage at any time.

Recommended operating temperature and supply ranges must be observed for guaranteed performance and data retention.

Such specifications allow the device to serve in a broad spectrum of electronic environments, from benign to harsh.

Electrical Specifications for DC and AC of the IDT71T75802S100PFI8

The IDT71T75802S100PFI8 delivers high-speed memory performance as evidenced by its electrical parameters:

5ns access time (depending on configuration and speed grade), supporting rapid data throughput.

Maximum clock frequencies up to 200 MHz (device-specific).

Input/output logic thresholds compatible with 2.5V systems.

Low standby, dynamic, and output leakage currents to minimize power use in dense memory arrays.

Input signals must meet defined setup and hold times relative to CLK for reliable operation.

The device’s careful timing and output buffer control minimize bus contention, supporting clean multi-device busing at speed.

JTAG Boundary Testing and Diagnostic Features of the IDT71T75802S100PFI8

In complex digital systems, testability is essential. The IDT71T75802S100PFI8 integrates an IEEE 1149.1-compliant JTAG boundary scan interface. This allows:

In-system test and diagnostic capability for populated PCBs during manufacturing.

Chainable device testing, isolating and locating faults without desoldering.

Support for all mandatory JTAG instructions and register access, speeding field and production troubleshooting.

The JTAG port can be disabled in functional operation, ensuring system performance is not compromised.

Possible Alternative or Replacement Parts for the IDT71T75802S100PFI8

To facilitate supply flexibility or legacy replacements, engineers may compare the IDT71T75802S100PFI8 to the following alternatives in the same family or from allied vendors:

Renesas IDT71T75602: Another variant in the family, offering similar architecture and interface, but with different configuration options (e.g., speed, word width).

Micron and Motorola ZBT™ SRAMs: Supported by the same ZBT™ architecture for multi-source compatibility; system-level timing and feature review is required for drop-in replacement.

Devices with matching x18 or x36 organizations, ZBT™ features, 2.5V supply, and parallel synchronous interface from established SRAM suppliers.

Component selection should always be validated by reviewing functional timing, electrical, and packaging details in the target application to ensure full compatibility.

Conclusion

The IDT71T75802S100PFI8 synchronous ZBT SRAM by Renesas Electronics delivers robust, high-speed parallel memory with zero dead bus cycles, making it ideal for demanding networking, communications, and embedded applications. Its configurability, strong feature set, and comprehensive test support address both current and forward-looking engineering challenges in high-performance digital systems. For those specifying next-generation memory with a need for deterministic timing, expandability, and testability, the IDT71T75802S100PFI8 merits serious consideration.