Renesas 70V24L35PF8

Overview

70V24L35PF8 from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 35 ns read/write cycle time, 3.3 V single-supply operation, and integrated semaphore arbitration logic - used in real-time inter-processor communication systems requiring concurrent memory access without external logic.

For engineers reviewing the 70V24L35PF8 datasheet, 70V24L35PF8 pinout, 70V24L35PF8 application, or 70V24L35PF8 equivalent, key selection criteria include industrial temperature support (–40°C to +85°C), 84-pin PLCC package compatibility, low standby current (660 µA typ.), and full hardware semaphore flag management across both ports.

Technical Context

This device implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous reads/writes to the same memory location. It integrates on-chip arbitration logic and eight dedicated semaphore flags accessible via A0–A2 addressing.

Operation requires no external glue logic for master/slave cascading: M/S pin configures BUSY as output (master) or input (slave), while CE-controlled automatic power-down reduces active current to 380 mW (typ.) and standby to 660 µA (typ.).

Key Specifications

Pinout & Package

70V24L35PF8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC, package code PLG84), body size ≈ 1.15 in × 1.15 in × 0.17 in, with all VDD pins tied to 3.3 V and all VSS pins grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-35AXC and IDT70V25L35PF8, the 70V24L35PF8 uniquely delivers industrial-grade 84-pin PLCC packaging with verified 660 µA standby current and seamless master/slave BUSY signaling - making it optimal for legacy-replacement and space-constrained through-hole designs.

Availability

70V24L35PF8 is available at Aetrix Electronics and suitable for industrial PLC communication hubs, telecom line card buffers, medical imaging pipelines, and avionics sensor fusion modules requiring stable component supply across extended product lifecycles.

Supply support for 70V24L35PF8 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 timing, memory interface, RF, and sensor signal conditioning solutions before its acquisition by Renesas Electronics in 2019.

The IDT70V24 family was designed specifically for real-time inter-processor communication in industrial, telecom, and medical systems requiring deterministic dual-port memory access without external arbitration logic.

FAQ

What is the maximum operating frequency supported by the 70V24L35PF8?

The 70V24L35PF8 supports a maximum read/write cycle time of 35 ns, corresponding to a theoretical maximum bus frequency of 28.6 MHz. This timing is guaranteed over the full industrial temperature range (–40°C to +85°C) and 3.3 V ± 0.3 V supply, with no derating required under specified DC and AC test conditions.

Does the 70V24L35PF8 support true simultaneous read/write operations to the same memory location?

Yes, the 70V24L35PF8 implements true dual-port SRAM cells that allow concurrent read and write access to the same address from left and right ports. Its on-chip arbitration logic ensures data integrity via BUSY flag assertion and optional semaphore locking - confirmed in the functional block diagram and truth tables of the official datasheet.

How does the semaphore functionality work on the 70V24L35PF8?

The 70V24L35PF8 provides eight hardware semaphore flags accessed via A0–A2 addressing and controlled by SEML/SEMR and CE/UB/LB states. Writing to I/O0 updates the flag; reading returns the value across all I/O lines. Contention is resolved by tSPS timing (5 ns minimum), with deterministic ownership determined by signal edge alignment - detailed in Truth Table II and timing waveforms.

Can the 70V24L35PF8 be used in a master/slave configuration with other dual-port SRAMs?

Yes, the 70V24L35PF8 supports cascaded master/slave operation using the M/S pin: when high, BUSY is driven as an output (master); when low, BUSY is sampled as an input (slave). This enables expansion to 32-bit+ data widths using multiple devices, as explicitly described in the Features section and functional block diagram.

What is the standby current consumption of the 70V24L35PF8, and how is it achieved?

The 70V24L35PF8 achieves 660 µA typical standby current (ISB3) by disabling internal circuitry when both CEL and CER are held above VDD – 0.2 V and all inputs are at rail voltages. This full CMOS-level standby mode is distinct from TTL-level standby (ISB1 = 13 mA typ.) and is enabled without external components - verified in DC Electrical Characteristics Table 09b.