Renesas 70V25S25PFI

Overview

70V25S25PFI from IDT (Integrated Device Technology) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 25 ns maximum access time (commercial temperature), 3.3 V single-supply operation, and on-chip semaphore arbitration logic - used in real-time inter-processor communication, FPGA co-processor buffering, and legacy bus bridging applications.

For engineers reviewing the 70V25S25PFI datasheet, 70V25S25PFI pinout, 70V25S25PFI application, or 70V25S25PFI equivalent, key selection criteria include dual-port timing symmetry, byte-select control for multiplexed bus compatibility, BUSY/INT flag behavior in master/slave cascading, and industrial-grade (-40°C to +85°C) thermal stability with low standby power (3.3 mW typ).

Technical Context

The 70V25S25PFI 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 without contention. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and supports hardware semaphore signaling using A0–A2 addressing of eight shared flags.

It operates exclusively from a 3.3 V ±0.3 V supply, uses LVTTL-compatible I/Os, and features automatic power-down when chip enable (CE) is deasserted - delivering 400 mW typical active power and 3.3 mW typical standby power. The device supports MASTER/SLAVE cascading for 32-bit+ data width expansion using M/S pin configuration.

Key Specifications

Pinout & Package

70V25S25PFI is housed in a 100-pin Thin Quad Flatpack (TQFP, package code PNG100), measuring 14 mm × 14 mm × 1.4 mm, with exposed pad not electrically connected. All VDD pins require local 3.3 V decoupling; 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-25AXC and AS7C34096B-25JCIN, the 70V25S25PFI uniquely integrates M/S-configurable BUSY signaling and dedicated semaphore registers - reducing BOM count and eliminating timing-critical software arbitration in real-time embedded systems.

Availability

70V25S25PFI is available at Aetrix Electronics and suitable for industrial motor control, FPGA co-processing, and legacy bus bridging applications requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.

Supply support for 70V25S25PFI 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 delivers high-speed dual-port SRAMs optimized for real-time inter-processor communication and deterministic data exchange in resource-constrained embedded systems.

FAQ

What is the maximum operating temperature range for the 70V25S25PFI?

The 70V25S25PFI is rated for industrial temperature operation from -40°C to +85°C. This is confirmed by the "PFI" suffix in the part number and explicitly stated in the Absolute Maximum Ratings table (TBIAS = -55°C to +125°C, TA = -40°C to +85°C). It is not rated for extended commercial (0°C to +70°C) or military ranges.

Does the 70V25S25PFI support true simultaneous read/write to the same memory address?

Yes, the 70V25S25PFI implements true dual-port SRAM cells that allow simultaneous reads from the same address on both ports. If a write occurs on one port to an address being read by the other, the BUSY flag asserts to signal contention - preserving data integrity without requiring external arbitration logic.

What is the function of the M/S pin on the 70V25S25PFI?

The M/S (Master/Slave) pin configures the 70V25S25PFI for cascaded operation: when driven high (VIH), it operates as a Master with BUSYR/BUSYL asserted as outputs; when driven low (VIL), it operates as a Slave with BUSYR/BUSYL configured as inputs. This enables seamless expansion to 32-bit+ data widths using multiple devices.

How many hardware semaphore flags does the 70V25S25PFI provide, and how are they accessed?

The 70V25S25PFI provides eight hardware semaphore flags, addressed using A0–A2. They are accessed by setting SEM = VIL and asserting CE = VIH or UB & LB = VIH (per Truth Table II). Reads return the flag value on all I/O lines (I/O0–I/O15); writes use I/O0 only, with tSWRD = 5 ns minimum write-to-read delay.

Is the 70V25S25PFI pin-compatible with other members of the IDT70V25/24 family?

Yes, the 70V25S25PFI shares the same 100-pin TQFP (PNG100) footprint and pinout with all IDT70V25/24 variants including 70V25L25PFI and 70V24S15PFI. A12 is No Connect across this subset, and all control, address, and I/O assignments match per the Pin Configurations diagram on page 3 of the datasheet.