Renesas 7035L15PF

Overview

IDT7035L from Integrated Device Technology (IDT) is a high-speed, 8K × 18 true dual-port static RAM with independent left/right ports, 15 ns max access time (commercial grade), 5 V ±10% single-supply operation, and integrated hardware semaphore and BUSY arbitration logic. It enables simultaneous read/write access to the same memory location and supports master/slave cascading for 36-bit+ data bus expansion in real-time inter-processor communication systems.

For engineers reviewing the IDT7035L datasheet, IDT7035L pinout, IDT7035L application, or IDT7035L equivalent, this page delivers verified functional identity, validated 100-pin TQFP package mapping, confirmed dual-port timing behavior, and two rigorously cross-checked alternative parts for 8K×18 dual-port SRAM migration paths.

Technical Context

The IDT7035L implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - enabling concurrent reads/writes without internal arbitration delay. Its on-chip BUSY logic detects address contention between ports and asserts push-pull BUSY flags to stall conflicting writes, while M/S pin configures master (BUSY output) or slave (BUSY input) mode.

Hardware semaphore support uses dedicated A0–A2-addressed registers (8 flags) accessed via SEM = VIL, allowing atomic token passing between processors. Interrupt flags (INTL/INTR) are triggered by writes to fixed mailbox addresses (1FFE_H/1FFF_H), with full TTL-compatible signaling and battery-backed 2 V data retention.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (14 mm × 14 mm × 1.4 mm body), with 4 corner pads unconnected (N/C), all VCC and GND pins distributed for low-noise power delivery.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C028V and R1EX24016AS, the IDT7035L uniquely integrates hardware semaphore, master/slave BUSY arbitration, and 5 V TTL compatibility in a 100-pin TQFP - reducing BOM count, PCB area, and firmware complexity for real-time inter-processor communication.

Availability

IDT7035L is available at Aetrix Electronics and suitable for industrial PLC communication hubs, avionics flight control interfaces, and medical imaging data pipelines requiring stable component supply, long-term lifecycle support, and guaranteed commercial-grade timing performance.

Supply support for IDT7035L includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Integrated Device Technology (IDT) was a fabless semiconductor company specializing in high-performance timing, memory interface, and RF solutions before its acquisition by Renesas Electronics in 2019. IDT pioneered dual-port SRAM architectures for real-time embedded systems.

The IDT7035L belongs to IDT's 7000-series dual-port SRAM family, designed specifically for deterministic inter-processor communication in safety-critical and high-throughput applications where hardware-enforced arbitration and low-latency memory access are mandatory.

FAQ

What is the maximum operating frequency supported by the IDT7035L?

The IDT7035L does not operate on a clock; it is fully asynchronous. Its 15 ns maximum access time (tAA) supports effective random-access throughput up to 66.7 MHz in commercial temperature range. Actual system frequency depends on board layout, signal integrity, and timing margining - but no clock signal is required for IDT7035L operation.

Does the IDT7035L require external pull-up resistors on BUSY pins?

No. The IDT7035L features push-pull BUSY outputs in master mode (M/S = VIH), eliminating the need for external pull-up resistors. When configured as a slave (M/S = VIL), BUSY pins become inputs and must be driven externally - typically tied HIGH for normal operation or LOW to inhibit writes to that port.

How is semaphore access controlled on the IDT7035L?

Semaphore access on the IDT7035L is enabled by setting SEM = VIL while holding CE = VIH or UB & LB = VIH. The eight semaphore flags are addressed using A0–A2; I/O0 writes the flag value, and I/O0–I/O17 read the full 18-bit flag content. This isolated access path prevents interference with main RAM operations.

Can the IDT7035L retain data during main power loss?

Yes. The IDT7035L supports battery backup operation down to 2 V VCC, retaining valid data with typical ICCDR ≤100 µA. This enables nonvolatile storage during AC power failure or system hibernation - provided a backup source (e.g., coin cell) is connected to VCC and CE is held active.

What happens when both ports attempt to write to the same address simultaneously?

When both ports access the same address concurrently, the IDT7035L's hardware BUSY logic asserts the BUSY flag on the later-arriving port (based on tAPS timing), gating its write signal internally. The earlier port completes its write unimpeded. No data corruption occurs - the BUSY signal provides deterministic, hardware-enforced serialization without software involvement.