Renesas 70V24S15PF

Overview

70V24S15PF from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right ports, 15 ns maximum access time (commercial grade), 3.3 V single-supply operation, and on-chip semaphore arbitration logic - used in real-time inter-processor communication systems requiring simultaneous read/write access to shared memory without external logic.

For engineers reviewing the 70V24S15PF datasheet, 70V24S15PF pinout, 70V24S15PF application, or 70V24S15PF equivalent, key selection criteria include its 84-pin PLCC package, industrial-grade timing compatibility (15/20 ns variants), LVTTL-compatible I/O, and integrated BUSY/INT flag signaling for master/slave memory expansion in embedded control and telecom data path designs.

Technical Context

This device implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port - enabling concurrent, collision-free reads/writes to any memory location. Its on-chip arbitration logic resolves port contention via hardware semaphore flags (A0–A2 addressed) and BUSY flag assertion during write conflicts.

The 70V24S15PF supports master/slave cascading for wider bus widths (e.g., 32-bit), with M/S pin configuring BUSY as output (master) or input (slave). It operates across commercial (0°C to +70°C) and industrial (–40°C to +85°C) temperature ranges and features four standby current modes (ISB1–ISB4) optimized for low-power system sleep states.

Key Specifications

Pinout & Package

70V24S15PF is housed in an 84-pin PLCC (PLG84) package measuring approximately 1.15 in × 1.15 in × 0.17 in, with lead-free (green) compliance available per ordering code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-15VC, the 70V24S15PF delivers 8× more memory depth and integrated hardware arbitration; compared with IDT70V25S15PF, it offers identical timing and feature set in a smaller 84-pin PLCC footprint - ideal for space-constrained industrial control modules.

Availability

70V24S15PF is available at Aetrix Electronics and suitable for industrial PLC communication, telecom line card buffering, and avionics data concentrators requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V24S15PF 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 solutions for communications, computing, and industrial markets.

The IDT70V24 product line delivers high-speed, low-power dual-port SRAMs designed specifically for real-time inter-processor communication, embedded control, and telecom infrastructure where deterministic latency and hardware arbitration are mandatory.

FAQ

What is the maximum operating frequency supported by the 70V24S15PF?

The 70V24S15PF has a 15 ns maximum access time (tAA), corresponding to a theoretical maximum read cycle rate of 66.7 MHz (1 / 15 ns). However, actual system clock frequency depends on full cycle timing including tRC (read cycle time = 15 ns), address setup (tAS = 0 ns), and output hold (tOH = 3 ns). For sustained operation, designers should target ≤60 MHz to accommodate PCB trace delays and margin.

Does the 70V24S15PF support industrial temperature range operation?

Yes, the 70V24S15PF is qualified for industrial temperature operation from –40°C to +85°C. This is explicitly confirmed in the datasheet's "Features" section and "Maximum Operating Temperature" table. The "S" suffix denotes standard power grade, and the "15" indicates 15 ns speed grade - both valid across industrial temperature range per IDT documentation.

How does the semaphore functionality work on the 70V24S15PF?

The 70V24S15PF implements eight hardware semaphore flags accessed via A0–A2 address lines. When SEM = VIL and CE = VIH (or UB & LB = VIH), I/O0 writes to the selected flag; all I/O pins (I/O0–I/O15) read its value. Semaphore contention is resolved automatically - if both ports attempt write simultaneously, tSPS (5 ns) must be observed to guarantee deterministic ownership, enforced by on-chip logic without software intervention.

Can the 70V24S15PF be used in a master/slave configuration with other IDT dual-port RAMs?

Yes, the 70V24S15PF supports master/slave cascading using the M/S pin: configured as master (M/S = VIH), it drives BUSY as an output flag; as slave (M/S = VIL), it accepts BUSY as input. This enables expansion beyond 16-bit width - e.g., two 70V24S15PF devices can form a 32-bit wide memory with synchronized arbitration, as described in the functional block diagram and pin configuration notes.

What is the purpose of the UBL/UBR and LBL/LBR pins on the 70V24S15PF?

The UBL/UBR (upper byte select) and LBL/LBR (lower byte select) pins enable independent 8-bit access to the 16-bit data bus. When UBL = VIL and LBL = VIH, only I/O8–I/O15 are active for write/read; when LBL = VIL and UBL = VIH, only I/O0–I/O7 are active. This supports multiplexed bus architectures and allows 8-bit microcontrollers to interface efficiently without external byte demux logic.