Renesas 7035L20PF

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 asynchronous 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, key selection considerations include dual-port timing independence, on-chip semaphore flag addressing (A0–A2), BUSY arbitration behavior under M/S = VIH/VIL, and battery-backed 2 V data retention capability - all critical for deterministic shared-memory embedded control designs.

Technical Context

The IDT7035L implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent access without internal clocking. Its on-chip arbitration logic resolves contention via push-pull BUSY outputs (when M/S = VIH) or BUSY inputs (when M/S = VIL), with tAPS = 5 ns priority setup time ensuring deterministic port-to-port resolution.

Hardware semaphore support uses dedicated A0–A2 address lines to select among eight binary flags, accessed via SEM = VIL while CE or byte enables are high; interrupt flags (INTL/INTR) are triggered by writes to fixed addresses 1FFE_H (left) and 1FFF_H (right), with programmable clear via read-enable cycles.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm; all VCC and GND pins require local decoupling per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7035L, CY7C028V offers lower voltage operation but sacrifices hardware semaphore and 5 V compatibility, while R1EX24002AS extends temperature range at the cost of flexible arbitration topology - making IDT7035L uniquely suited for scalable, deterministic 5 V dual-processor systems.

Availability

IDT7035L is available at Aetrix Electronics and suitable for industrial PLC communication bridges, avionics sensor fusion modules, and medical imaging data pipelines requiring stable component supply, long-term lifecycle support, and verified dual-port timing behavior.

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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs for communications, computing, and industrial markets.

IDT7035L belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems requiring hardware-enforced memory coherency and low-latency shared access.

FAQ

What is the maximum access time specification for IDT7035L under commercial conditions?

IDT7035L has a maximum access time (tAA) of 15 ns at VCC = 5.0 V ±10% and TA = 0 °C to +70 °C. This value is guaranteed across full operating voltage and temperature range, and applies to both left and right ports independently during read operations with address and control signals meeting specified setup/hold times.

How does the M/S pin affect BUSY pin functionality in IDT7035L?

When M/S = VIH, BUSYL and BUSYR operate as push-pull outputs indicating port contention; when M/S = VIL, they become inputs used to accept external BUSY signals in slave-mode cascades. In slave mode, an asserted BUSY input (LOW) internally inhibits writes on that port - a behavior confirmed in Truth Table IV and Functional Description section.

Can IDT7035L retain data at 2 V, and what is the typical retention current?

Yes, IDT7035L supports data retention at VCC = 2.0 V with typical ICCDR of 100 µA and maximum 1500 µA (commercial grade). This is explicitly characterized in Table 10 and validated across all temperature ranges - enabling reliable battery backup operation without external supervision circuitry.

How are semaphore flags addressed and accessed in IDT7035L?

IDT7035L provides eight hardware semaphore flags addressed by A0–A2. Access requires SEM = VIL while CE or both UB/LB are high (Truth Table III). Writing uses I/O0; reading returns the flag value across all 18 I/O lines. This mechanism is fully documented in Tables 3 and 18 and Figure 10 waveforms.

What is the purpose of the INTL and INTR pins in IDT7035L, and how are they triggered?

INTL and INTR are interrupt flags asserted when the opposite port writes to fixed addresses 1FFE_H (INTL) or 1FFF_H (INTR). They are cleared by reading those same addresses with OE and CE active. This mailbox behavior is defined in Truth Table XVI and Functional Description, enabling software-triggered cross-processor notifications without polling.