Renesas 70V24S35PF

Overview

70V24S35PF 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 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 70V24S35PF datasheet, 70V24S35PF pinout, 70V24S35PF application, or 70V24S35PF equivalent, this page delivers verified timing specs, industrial-grade (-40°C to +85°C) operation, PLCC-84 package mapping, and validated alternatives for bus-width expansion in embedded control and telecom switching architectures.

Technical Context

The 70V24S35PF implements fully asynchronous dual-port architecture with separate address, data, and control buses per port, enabling simultaneous read/write operations to the same memory location. It integrates on-chip arbitration logic, BUSY flag signaling, and eight hardware semaphores addressed via A0–A2 for inter-port synchronization.

It supports MASTER/SLAVE cascading to expand data width beyond 16 bits using M/S pin configuration, where BUSY is output on MASTER and input on SLAVE. All I/Os are LVTTL-compatible, and power management includes CE-controlled automatic standby mode with sub-mW quiescent current.

Key Specifications

Pinout & Package

70V24S35PF is housed in an 84-pin Plastic Leaded Chip Carrier (PLG84) package with 0.05″ lead pitch, body size ≈ 1.15 in × 1.15 in × 0.17 in. Pin 1 is marked by corner notch; all VDD pins require local decoupling, and all VSS pins must be 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 IDT70V25S35PF, the 70V24S35PF uniquely delivers industrial-grade PLCC-84 packaging with MASTER/SLAVE cascade capability - enabling drop-in replacement in legacy through-hole designs while supporting scalable memory width expansion without added logic.

Availability

70V24S35PF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, avionics display buffering, and protocol gateway applications requiring stable component supply across extended product lifecycles.

Supply support for 70V24S35PF 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 sensor signal conditioning ICs for communications and computing markets.

The IDT70V24 family was designed specifically for high-reliability, real-time inter-processor communication systems requiring deterministic dual-port memory access without external arbitration logic.

FAQ

What is the maximum operating frequency supported by the 70V24S35PF?

The 70V24S35PF supports a maximum read cycle rate of 28.6 MHz, derived from its 35 ns read cycle time (tRC). This timing applies under commercial and industrial temperature ranges with VDD = 3.3 V ±0.3 V and specified AC test conditions. The device does not include internal clock circuitry - operation is fully asynchronous and driven by external control timing.

Does the 70V24S35PF support true simultaneous read/write to the same address?

Yes, the 70V24S35PF implements true dual-port SRAM cells that allow concurrent read and write operations to the same memory location - one port reading while the other writes - without data corruption or arbitration delay. This behavior is guaranteed by the silicon architecture and confirmed in the functional block diagram and truth table I of the datasheet.

Is A12 connected or unused on the 70V24S35PF?

A12 is a No Connect (NC) pin on the 70V24S35PF, as explicitly stated in Note 1 of the Pin Configurations section and reinforced in the Pin Names table. The device uses only A0–A11 for 4K addressing (2¹² = 4096 locations), and A12 must be left unconnected or tied to ground per design guidelines.

How does the BUSY flag function in MASTER/SLAVE configurations with the 70V24S35PF?

In MASTER configuration (M/S = VIH), BUSY is an output flag indicating port contention during simultaneous access attempts. In SLAVE configuration (M/S = VIL), BUSY is an input used to detect arbitration status from the MASTER. This bidirectional BUSY signaling enables hardware-coordinated access without software polling - a core feature confirmed in the Features and Pin Names sections of the datasheet.

Can the 70V24S35PF operate with mixed 3.3 V and 5 V interfaces?

No, the 70V24S35PF is strictly a 3.3 V LVTTL-compatible device with VIH minimum of 2.0 V and VIL maximum of 0.8 V. It is not 5 V tolerant; applying 5 V signals to any input may exceed absolute maximum ratings and cause permanent damage. Level-shifting circuitry is required for interfacing with 5 V controllers or peripherals.