Renesas 70V24L35PFG

Overview

70V24L35PFG from Integrated Device Technology (IDT) is a high-speed, low-power 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 industrial temperature range (–40°C to +85°C). It enables simultaneous access to shared memory in real-time inter-processor communication systems such as telecom line cards and industrial PLCs.

For engineers reviewing the 70V24L35PFG datasheet, 70V24L35PFG pinout, 70V24L35PFG application, or 70V24L35PFG equivalent, key selection criteria include its 84-pin PLCC package, on-chip semaphore arbitration, BUSY/INT flag signaling, and support for MASTER/SLAVE cascading in 32-bit+ memory expansion architectures.

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with separate address, control, and I/O buses per port. It integrates hardware semaphore logic across eight flags (A0–A2 addressed), enabling deterministic resource locking between independent processors without external logic.

Port arbitration uses dedicated BUSY output (Master) / BUSY input (Slave) signaling and supports both R/W-controlled and CE/UB/LB-controlled write timing. The 70V24L35PFG operates exclusively at 3.3 V ±0.3 V and features automatic power-down via chip enable (CE), achieving 660 µW standby current in full CMOS-input mode.

Key Specifications

Pinout & Package

70V24L35PFG is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC, package code PLG84), with body dimensions approximately 1.15 in × 1.15 in × 0.17 in. All VDD pins require local 3.3 V decoupling; all VSS pins must be connected to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC, the 70V24L35PFG trades raw speed for integrated arbitration and lower standby power; versus IDT70V24L25PFG, it offers reduced power consumption and relaxed timing at the cost of 10 ns slower access-ideal for thermally constrained industrial control.

Availability

70V24L35PFG is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 70V24L35PFG 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications, computing, and industrial markets.

The IDT70V24 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems requiring hardware-synchronized shared memory without external logic.

FAQ

What is the maximum operating frequency supported by the 70V24L35PFG?

The 70V24L35PFG supports a maximum read/write cycle time (tRC) of 35 ns, corresponding to a theoretical maximum sustained operation of 28.6 MHz per port. This is not a clocked interface-the device is fully asynchronous, so actual throughput depends on address/control setup/hold timing and bus protocol overhead, not a fixed clock frequency.

Does the 70V24L35PFG support hot insertion or live swapping in backplane systems?

No, the 70V24L35PFG does not support hot insertion. Its DC electrical specifications assume stable VDD and VSS rails during operation; applying power or signal transitions while other system voltages are active may exceed absolute maximum ratings (e.g., VTERM ≤ VDD + 0.3 V). Backplane designs require power sequencing controllers to ensure VDD ramps before any control or I/O signals are asserted.

Can the 70V24L35PFG be used in MASTER/SLAVE configuration with devices from other manufacturers?

No-MASTER/SLAVE cascading using the M/S pin and BUSY handshake is specific to the IDT70V24/25/34/35 family. Cross-manufacturer interoperability is not guaranteed due to differences in BUSY assertion timing, semaphore addressing, and arbitration state machines. For multi-vendor systems, use discrete logic or FPGA-based arbitration instead.

How many semaphore flags does the 70V24L35PFG provide, and how are they accessed?

The 70V24L35PFG provides eight hardware semaphore flags, addressed via A0–A2. They are accessed by setting SEM = VIL (low) while holding UB = LB = VIH (high) and CE = VIH (high) on the desired port. Writing to I/O0 stores the flag value; reading from any I/O pin returns the flag state. Full details are in Truth Table II of the datasheet.

Is the 70V24L35PFG pin-compatible with earlier IDT70V24 variants like the 70V24S35PFG?

Yes-the 70V24L35PFG shares identical 84-pin PLCC pinout and signal mapping with all IDT70V24 variants (e.g., 70V24S35PFG, 70V24L25PFG). The 'L' suffix denotes low-power logic (660 µW standby vs. 3.3 mW for 'S'), but all electrical and mechanical interfaces remain fully compatible for drop-in replacement in existing layouts.