Renesas 7035S15PF

Overview

7035S15PF from IDT (Integrated Device Technology) is a high-speed 8K × 18 true dual-port static RAM with independent left/right ports, 15 ns maximum access time (commercial grade), TTL-compatible 5 V ±10% supply, and integrated hardware semaphore and BUSY arbitration logic. It enables simultaneous asynchronous reads/writes to the same memory location in real-time inter-processor communication systems.

For engineers reviewing the 7035S15PF datasheet, 7035S15PF pinout, 7035S15PF application, or 7035S15PF equivalent, key selection criteria include dual-port timing coordination, master/slave BUSY flag behavior, 18-bit byte-select control for multiplexed bus compatibility, and low-power standby operation with 2 V data retention capability.

Technical Context

The 7035S15PF implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - no shared clock or synchronization required. Its on-chip arbitration logic resolves port contention via push-pull BUSY outputs (when M/S = VIH) or BUSY inputs (when M/S = VIL), supporting both master/slave cascading and independent operation.

Hardware semaphore support uses A0–A2 to select among eight dedicated flags, accessed via SEM = VIL with CE or byte enables high; interrupt flags (INTL/INTR) are triggered by writes to fixed addresses 1FFE_H and 1FFF_H. The device supports upper/lower byte enable (UBL/LBL, UBR/LBR) for 18-bit data path partitioning and full 36-bit expansion using MASTER/SLAVE configuration.

Key Specifications

Pinout & Package

7035S15PF is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be externally decoupled per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C3256A-15JC, the 7035S15PF uniquely delivers true dual-port 18-bit operation at 5 V with integrated hardware arbitration - making it irreplaceable in deterministic real-time inter-processor architectures where timing predictability and zero-software-overhead synchronization are mandatory.

Availability

7035S15PF is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial motion control, and legacy bus interface bridge applications requiring stable component supply across extended production lifecycles.

Supply support for 7035S15PF 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

IDT (Integrated Device Technology) was a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions before its acquisition by Renesas Electronics in 2019.

The IDT7035 family was designed specifically for deterministic, low-latency inter-processor communication in embedded control and signal processing systems requiring hardware-enforced memory coherency without software intervention.

FAQ

What is the maximum operating frequency supported by the 7035S15PF?

The 7035S15PF does not operate on a clock; it is fully asynchronous. Its 15 ns maximum access time (tAA) supports effective read cycles up to approximately 67 MHz when used in systems with tight setup/hold timing margins. Actual system throughput depends on bus protocol overhead, not an internal clock frequency.

Does the 7035S15PF support battery backup operation?

Yes - the 7035S15PF supports data retention down to 2 V supply, enabling reliable operation from a backup battery during main power loss. This feature is confirmed in the DC Electrical Characteristics table (VDR = 2.0 V min) and applies specifically to the 'L' and 'S' variants including 7035S15PF.

How does the BUSY arbitration work when multiple 7035S15PF devices are cascaded?

In cascaded configurations, one 7035S15PF is configured as Master (M/S = VIH) to generate BUSY outputs; others are Slaves (M/S = VIL) that accept BUSY as write-inhibit inputs. The Master's BUSY signals must be routed to all Slaves' BUSY pins, and address/CE timing must satisfy tAPS (5 ns min) to prevent glitched arbitration.

Can the 7035S15PF perform simultaneous read and write operations on the same memory address?

Yes - the 7035S15PF's true dual-port architecture allows simultaneous read and write to the same address. However, if both ports attempt a write to the same location, BUSY arbitration activates to inhibit one write, ensuring data integrity. Reads remain unaffected during contention.

What are the valid interrupt mailbox addresses for the 7035S15PF?

The 7035S15PF uses fixed addresses 1FFE_H (for INTL assertion/clear) and 1FFF_H (for INTR assertion/clear). These locations function as user-defined mailboxes when interrupts are enabled; otherwise, they behave as standard SRAM cells within the 8K × 18 array.