Renesas 70V25S20PF8

Overview

70V25S20PF8 from Integrated Device Technology is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 20 ns max access time (commercial grade), 3.3 V single supply, and on-chip semaphore arbitration-used in real-time inter-processor communication systems requiring concurrent read/write access to shared memory.

For engineers reviewing the 70V25S20PF8 datasheet, 70V25S20PF8 pinout, 70V25S20PF8 application, or 70V25S20PF8 equivalent, key selection criteria include dual-port timing compatibility, 100-pin TQFP footprint, industrial-grade standby current (≤20 mA), and integrated BUSY/INT flag signaling for lock-free synchronization.

Technical Context

This device implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling simultaneous reads from identical memory locations without contention. It supports MASTER/SLAVE cascading via M/S pin to expand data width beyond 16 bits using BUSY flag handshaking.

On-chip hardware semaphore logic uses A0–A2 addressing to manage eight shared flags across ports, with dedicated SEM, UB/LB, and R/W control enabling atomic read-modify-write operations. All I/Os are LVTTL-compatible with 3.3 V ±0.3 V supply and operate across commercial temperature range (0°C to +70°C).

Key Specifications

Pinout & Package

70V25S20PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) package, designated PNG100, measuring 14 mm × 14 mm × 1.4 mm. All VDD pins require connection to 3.3 V supply; 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-20AXC and IDT70V24S20PF8, the 70V25S20PF8 delivers integrated hardware semaphore and MASTER/SLAVE BUSY signaling-reducing system-level logic, improving determinism in real-time inter-processor communication, and enabling scalable memory width expansion without redesign.

Availability

70V25S20PF8 is available at Aetrix Electronics and suitable for industrial PLC communication modules, DSP co-processor buffers, and telecom line card packet buffers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for 70V25S20PF8 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 product line delivers high-speed dual-port SRAMs optimized for real-time inter-processor communication, featuring hardware semaphore, BUSY arbitration, and LVTTL compatibility for seamless integration with FPGAs and microcontrollers.

FAQ

What is the maximum access time specification for the 70V25S20PF8?

The 70V25S20PF8 has a maximum address access time (tAA) of 20 ns under commercial operating conditions (0°C to +70°C, VDD = 3.3 V ±0.3 V). This value is guaranteed across voltage and temperature extremes within its specified range and applies to both left and right ports independently. The 70V25S20PF8 achieves this performance without requiring clocking-timing is fully asynchronous and governed by CE, R/W, and address setup constraints.

Does the 70V25S20PF8 support hardware semaphore functionality?

Yes, the 70V25S20PF8 includes fully integrated hardware semaphore logic supporting eight independent flags. These are accessed via A0–A2 address lines with SEM enable control, allowing atomic read-modify-write operations without external logic or software intervention. The 70V25S20PF8 implements this using dedicated on-die circuitry that meets tSWRD ≤ 5 ns and tSPS ≥ 5 ns timing requirements-critical for deterministic inter-processor synchronization.

What is the correct power supply configuration for the 70V25S20PF8?

The 70V25S20PF8 requires a single 3.3 V supply (VDD = 3.3 V ±0.3 V) with all VDD pins connected to the same regulated rail and all VSS pins tied to a common ground plane. Datasheet Note 2 specifies that multiple VDD/VSS pins must be decoupled locally using 0.1 µF ceramic capacitors. The device draws up to 150 mA typical active current (IDD) and 20 mA max standby current (ISB1) under TTL-level input conditions-power integrity must maintain <100 mV ripple at 100 MHz.

Can the 70V25S20PF8 be used in MASTER/SLAVE configurations?

Yes, the 70V25S20PF8 supports MASTER/SLAVE cascading via the M/S pin: when driven high, BUSY functions as an output flag indicating port contention; when driven low, BUSY becomes an input for slave-side handshaking. This enables expansion of data bus width beyond 16 bits-for example, two 70V25S20PF8 devices can form a 4K × 32 system with full-speed, error-free operation and no external glue logic.

Is the 70V25S20PF8 pin-compatible with other members of the IDT70V25/24 family?

The 70V25S20PF8 shares the same 100-pin TQFP (PNG100) package and pinout with IDT70V25S15PF8, IDT70V25S25PF8, and IDT70V24S20PF8-including identical placement of CEL/CER, R/WL/R/WR, OEL/OER, and semaphore control pins. However, A12L and A12R are No Connect per datasheet Note 1, distinguishing it from IDT70V35/34 variants. This enables drop-in replacement within the same speed grade and temperature grade.