Renesas 70V25S25PFGI8

Overview

70V25S25PFGI8 from Integrated Device Technology is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 25 ns max access time (commercial/industrial), 3.3 V ±0.3 V single supply, and on-chip semaphore arbitration logic - used in real-time inter-processor communication systems requiring simultaneous read/write access to shared memory.

For engineers reviewing the 70V25S25PFGI8 datasheet, 70V25S25PFGI8 pinout, 70V25S25PFGI8 application, or 70V25S25PFGI8 equivalent, key selection criteria include dual-port timing compatibility, industrial temperature support (–40°C to +85°C), TQFP-100 packaging, byte-select control for multiplexed bus interfacing, and integrated BUSY/INT flag signaling for master/slave coordination.

Technical Context

The 70V25S25PFGI8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling concurrent reads/writes to any memory location without external arbitration logic. Its on-chip hardware semaphore logic supports eight shared flags addressed via A0–A2, with dedicated SEM pins and contention window timing (tSPS = 5 ns).

It features automatic power-down via CE-controlled standby modes: ISB1 = 13 mA (both ports TTL-level standby), ISB3 = 0.2 mA (full CMOS-level standby), and active current IDD = 120 mA (typ.) at 3.3 V. The device uses LVTTL-compatible I/Os and supports master/slave cascading via M/S pin for 32-bit+ data bus expansion.

Key Specifications

Pinout & Package

70V25S25PFGI8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm, and exposed thermal pad (not electrically connected). Pin 1 marked by corner notch; all VDD (pins 22, 39, 62, 79) and VSS (pins 21, 38, 61, 78, 99) must be decoupled locally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-25BGXI and AS7C34096B-25JIN, the 70V25S25PFGI8 delivers superior low-power standby (0.2 mA ISB3) and unique master/slave BUSY coordination - critical for scalable multi-device memory subsystems in industrial and telecom infrastructure.

Availability

70V25S25PFGI8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line card buffers, real-time signal processing pipelines, and multi-processor communication systems requiring stable component supply across extended product lifecycles.

Supply support for 70V25S25PFGI8 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT70V25 family targets deterministic real-time embedded systems requiring hardware-synchronized dual-port memory - optimized for inter-processor communication, digital signal buffering, and programmable logic co-processing.

FAQ

What is the maximum operating frequency supported by the 70V25S25PFGI8?

The 70V25S25PFGI8 does not specify a maximum clock frequency; it is an asynchronous SRAM. Its performance is defined by timing parameters: tRC (read cycle time) = 25 ns max, enabling effective operation up to 40 MHz in systems with zero wait states. This timing is guaranteed across the full industrial temperature range (–40°C to +85°C) and 3.3 V ±0.3 V supply.

Does the 70V25S25PFGI8 support true simultaneous read/write operations on the same memory address?

Yes, the 70V25S25PFGI8 implements true dual-port SRAM cells that allow concurrent read and write operations to the same memory location without data corruption or arbitration delay. This capability is intrinsic to its architecture and confirmed in the datasheet's "True Dual-Ported memory cells" feature statement - a core differentiator from pseudo-dual-port or FIFO-based alternatives.

How is the M/S pin used in a master/slave configuration with the 70V25S25PFGI8?

In a master/slave setup, the M/S pin configures BUSY behavior: when M/S = VIH, the device operates as Master and drives BUSY as an output flag during port contention; when M/S = VIL, it acts as Slave and accepts BUSY as an input to stall writes. This enables seamless 32-bit bus expansion using multiple 70V25S25PFGI8 devices without external logic.

What are the standby current specifications for the 70V25S25PFGI8 under industrial conditions?

Under industrial conditions (–40°C to +85°C), the 70V25S25PFGI8 specifies ISB1 = 13 mA (typ.) for both ports in TTL-level standby, ISB3 = 0.2 mA (typ.) for full CMOS-level standby (CE > VDD − 0.2 V), and ISB2 = 65 mA (typ.) for one active port. These values are measured at VDD = 3.3 V and reflect guaranteed operation across the full temperature range.

Is the 70V25S25PFGI8 pin-compatible with other members of the IDT70V25/24 family?

Yes, the 70V25S25PFGI8 shares the same 100-pin TQFP package and pinout as all IDT70V25/24 variants (e.g., 70V25L25PFGI8, 70V24S15PFGI), including identical placement of address, data, control, and power pins. A12 is No Connect across the family, and all timing-critical signals (CE, R/W, OE, UB/LB, SEM) occupy matching positions - enabling drop-in replacement within speed-grade and power-mode constraints.