Renesas 7005L35PF8

Overview

7005L35PF8 from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 35 ns max read cycle time (tRC), 2V data retention capability, and integrated semaphore/arbitration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7005L35PF8 datasheet, 7005L35PF8 pinout, 7005L35PF8 application, or 7005L35PF8 equivalent, this device supports simultaneous asynchronous access, hardware BUSY flag arbitration, interrupt signaling, and master/slave cascading for 16-bit+ memory expansion - critical for multiprocessor control, digital signal processing, and military-grade avionics interfaces.

Technical Context

The 7005L35PF8 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A12L/I/O0L–I/O7L/R/WL/CEL/OEL on left; A0R–A12R/I/O0R–I/O7R/R/WR/CER/OER on right), enabling concurrent reads/writes to any memory location without external logic.

On-chip arbitration includes push-pull BUSY outputs (M/S = H) or inputs (M/S = L), eight semaphore flags accessed via A0–A2, and interrupt generation triggered by writes to dedicated addresses (e.g., 1FFF_H sets INTR), all operating under single 5V ±10% supply with TTL-compatible I/O levels.

Key Specifications

Pinout & Package

64-pin TQFP package (PNG64) with 0.5 mm pitch; body dimensions 14 mm × 14 mm × 1.4 mm; requires all VCC pins connected to 5V supply and all GND pins tied to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AXC and IDT70V27L25PFGI, the 7005L35PF8 uniquely combines 5V TTL compatibility, industrial temperature range, 2V data retention, and 64-pin TQFP packaging - making it optimal for legacy 5V embedded systems requiring robustness and low-power backup.

Availability

7005L35PF8 is available at Aetrix Electronics and suitable for radar signal processing, industrial PLC communication, aerospace avionics bus interface, and military C4ISR data fusion requiring stable component supply across extended product lifecycles.

Supply support for 7005L35PF8 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 for communications, computing, and industrial markets.

The 7005L35PF8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems where concurrent access, hardware arbitration, and data integrity under power interruption are critical.

FAQ

What is the maximum operating frequency supported by the 7005L35PF8?

The 7005L35PF8 has a maximum read cycle time (tRC) of 35 ns, corresponding to a theoretical maximum sustained access rate of 28.6 MHz per port. This value is guaranteed across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, with no derating required for simultaneous dual-port operation. The 7005L35PF8 achieves this performance using CMOS high-performance fabrication without requiring clocked timing or external synchronization.

Does the 7005L35PF8 support battery backup operation, and what voltage is required?

Yes, the 7005L35PF8 supports battery backup operation with data retention down to 2.0 V (VDR = 2.0 V). In data retention mode (CE > VHC, VIN > VHC or < VLC), typical current draw is 100 µA, with a maximum of 4000 µA across military and industrial temperature ranges. This allows the 7005L35PF8 to preserve memory contents during main power failure while interfacing directly with standard 2V lithium or backup coin-cell sources.

How does the BUSY arbitration logic function in master versus slave configuration?

In master configuration (M/S = H), BUSYL and BUSYR are push-pull outputs that assert low when the opposite port initiates an access to the same memory address, blocking writes until the conflict resolves. In slave configuration (M/S = L), BUSYL and BUSYR become inputs; a low signal from the master inhibits writes on the slave port. The 7005L35PF8 guarantees tAPS = 5 ns arbitration priority setup time to ensure deterministic resolution without external logic.

Can the 7005L35PF8 be used in a 16-bit data bus system, and how is this implemented?

Yes, the 7005L35PF8 supports 16-bit expansion via master/slave cascading. Two devices are connected with M/S = H on the master and M/S = L on the slave; the master's BUSY output drives the slave's BUSY input. Address lines A0–A12 are shared, while I/O0–I/O7 of each device form the lower and upper byte lanes. This configuration delivers full-speed 16-bit access without additional discrete logic or timing penalties.

What are the key differences between the 'S' and 'L' versions of the IDT7005 family, and which applies to 7005L35PF8?

The 'L' suffix in 7005L35PF8 denotes the low-power variant: active power is 700 mW (typ.) vs. 750 mW for 'S', and standby drops to 1 mW (typ.) vs. 5 mW - enabling battery backup with 2V retention. Both share identical 35 ns speed grade, 64-pin TQFP package, and functional specifications. The 'L' version is optimized for applications demanding ultra-low quiescent current without sacrificing access speed or temperature range.