Renesas 7005S35PFI8

Overview

7005S35PFI8 from IDT is a high-speed 8K × 8 (64 Kbit) true dual-port static RAM with independent left/right ports, 35 ns maximum read cycle time, TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to the same memory location and supports master/slave cascading for 16-bit+ bus expansion in real-time inter-processor communication systems.

For engineers reviewing the 7005S35PFI8 datasheet, 7005S35PFI8 pinout, 7005S35PFI8 application, or 7005S35PFI8 equivalent, key selection criteria include BUSY arbitration timing (tBDD ≤ 35 ns), semaphore flag support (A0–A2 addressed), dual-port power-down control via CE, and TQFP-64 packaging for space-constrained embedded designs.

Technical Context

The 7005S35PFI8 implements fully asynchronous dual-port operation with on-chip arbitration logic that resolves port contention using either chip-enable (CE) or address-match priority (tAPS = 5 ns). Its BUSY signaling operates in push-pull mode-output when M/S = H (master), input when M/S = L (slave)-and blocks writes during cross-port access to shared addresses.

It integrates full hardware semaphore support (8 flags, accessed via I/O0–I/O7 with A0–A2 addressing) and interrupt generation (INTL/INTR) triggered by write to dedicated addresses (e.g., 1FFF_H sets INTR). Data retention at 2 V (IDT7005L variant only) is not applicable to this S-version; active power is 150 mA typ (both ports), standby current ISB1 = 13 mA (TTL-level inputs).

Key Specifications

Pinout & Package

7005S35PFI8 is housed in a 64-pin thin quad flatpack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm body, and exposed thermal pad (not electrically connected). All VCC pins require local decoupling; all GND pins must be solidly tied to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-35JC and AS7C38097A-35TIN, the 7005S35PFI8 delivers unique value through integrated push-pull BUSY arbitration and hardware semaphore registers - reducing BOM count, PCB area, and firmware development effort in deterministic real-time systems.

Availability

7005S35PFI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffers, and industrial PLC memory expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7005S35PFI8 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics.

The IDT7005 family was designed specifically for high-reliability dual-port memory applications in aerospace, industrial automation, and telecommunications infrastructure where deterministic arbitration and low-latency inter-processor data exchange are critical.

FAQ

What is the maximum operating frequency supported by the 7005S35PFI8?

The 7005S35PFI8 does not operate at a fixed clock frequency. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 35 ns, enabling effective throughput up to ~28.6 MHz in continuous read cycles. Write cycle time (tWC) is also 35 ns. Actual system speed depends on address setup, hold, and enable timing margins - not a synchronous clock input.

Does the 7005S35PFI8 support battery backup data retention?

No. The 7005S35PFI8 is the "S" (standard power) variant and does not support battery backup. Only the "L" (low-power) variant (e.g., 7005L35PFI8) guarantees data retention at 2 V with ICCDR ≤ 4000 µA. The 7005S35PFI8 requires continuous 5 V ±10% supply for operation and retains no data below VCC min (4.5 V).

How does BUSY arbitration work when M/S = H versus M/S = L on the 7005S35PFI8?

When M/S = H, the 7005S35PFI8 operates as a master: BUSYL and BUSYR are push-pull outputs that assert LOW to block writes on the opposing port during contention. When M/S = L, it operates as a slave: BUSYL and BUSYR become inputs, and the device samples external BUSY signals to inhibit its own writes - enabling hierarchical arbitration in multi-device systems.

Can the 7005S35PFI8 be used in a 16-bit data bus configuration?

Yes. The 7005S35PFI8 supports 16-bit expansion via Master/Slave cascading: one device configured as master (M/S = H) provides BUSY outputs, while another as slave (M/S = L) accepts those BUSY inputs. Using the M/S pin and proper CE sequencing, two 7005S35PFI8 devices can form a 8K × 16 memory without external glue logic.

What are the voltage levels for reliable interrupt flag assertion on the 7005S35PFI8?

The 7005S35PFI8 interrupt outputs (INTL/INTR) are open-drain and require external pull-up resistors. For TTL compatibility, use a 5 V pull-up. Assertion occurs when the corresponding port writes to address 1FFF_H (right) or 1FFE_H (left); de-assertion occurs on write to the complementary address. Both flags must be initialized at power-up per datasheet requirement.