Renesas IDT70825L25PF8

Overview

IDT70825L25PF8 from Integrated Device Technology is a high-speed 8K × 16-bit Sequential Access Random Access Memory (SARAM™) with dual-port architecture: asynchronous random access port and synchronous sequential access port. It delivers 25 ns clock cycle time, 20 ns random-access address access time (tAA), and 1 mW typical standby power. Used in real-time data buffering applications such as packet switching engines and video frame stores where concurrent sequential streaming and random lookup are required.

For engineers reviewing the IDT70825L25PF8 datasheet, IDT70825L25PF8 pinout, IDT70825L25PF8 application, or IDT70825L25PF8 equivalent, key selection criteria include dual-port timing isolation, buffer chaining support for circular FIFOs, 2V data retention capability, and compatibility with Intel BMIC/82430 PCI set interfaces.

Technical Context

The IDT70825L25PF8 implements a CMOS-based Dual-Port RAM core with physically separate I/O paths: a TTL-compatible asynchronous random port (A0–A12, I/O0–I/O15, CE/OE/R/W/LB/UB) and a clocked sequential port (SCLK, SCE, SR/W, SI/O0–SI/O15, SSTRT1/SSTRT2, EOB1/EOB2). Address pointer logic supports two independently configurable buffers with start/end registers and four flow modes (BUFFER CHAINING, STOP, LINEAR, MASK).

It features automatic power-down per port via CE and SCE, battery backup operation down to 2V VCC, and full TTL-level compatibility on all inputs/outputs. The device uses internal register-controlled flag status (EOB1/EOB2) and command-mode register access (via CMD pin and A0–A2) for buffer configuration - all verified for industrial temperature range (−40°C to +85°C) at 25 ns speed grade.

Key Specifications

Pinout & Package

Package: 80-pin Thin Quad Flatpack (TQFP), PN80-1, 14 mm × 14 mm × 1.4 mm body, lead-free compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-25AXC and IDT70V25L25PF, the IDT70825L25PF8 uniquely combines 5 V TTL compatibility, 2 V data retention, and integrated buffer flow control - making it irreplaceable in legacy industrial systems requiring zero-software-overhead circular buffering under brown-out conditions.

Availability

IDT70825L25PF8 is available at Aetrix Electronics and suitable for packet switching engines, broadcast video encoders, PCI interface bridges, and industrial motion controllers requiring stable component supply across extended product lifecycles.

Supply support for IDT70825L25PF8 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs for communications, computing, and industrial markets.

The IDT70825L25PF8 belongs to IDT's SARAM™ family - designed specifically for real-time embedded systems needing deterministic dual-port memory with hardware-managed buffering and battery-backed data integrity.

FAQ

What is the maximum operating frequency supported by the sequential port of IDT70825L25PF8?

IDT70825L25PF8 supports a 25 ns clock cycle time on its sequential port, corresponding to a maximum operating frequency of 40 MHz. This timing is guaranteed over the full industrial temperature range (−40°C to +85°C) and includes setup/hold margins for SCLK, SCE, SR/W, and SI/O signals as specified in the AC Electrical Characteristics table.

Does IDT70825L25PF8 support true simultaneous read/write across both ports?

Yes, IDT70825L25PF8 supports true concurrent access: the random port can perform a read or write while the sequential port executes a read, write, or pointer update - provided CE and SCE are not asserted simultaneously. Internal arbitration ensures no bus contention or data corruption occurs during overlapping operations.

How is buffer chaining implemented in IDT70825L25PF8, and what pins control it?

Buffer chaining in IDT70825L25PF8 is implemented via the flow control register (accessed in CMD mode using A0–A2 and R/W). Setting bits 1:0 and 3:2 to '00' configures BUFFER CHAINING mode, causing the sequential address pointer to jump from the end of Buffer #1 to the start of Buffer #2 (and vice versa) upon EOB assertion - controlled entirely by internal logic, not external pins.

Can IDT70825L25PF8 retain data when powered at 2.0 V, and what conditions must be met?

Yes, IDT70825L25PF8 guarantees data retention at VCC = 2.0 V (minimum), but only when both ports are disabled: CE and SCE must be held HIGH (VIH), and all inputs must be static (no toggling). The device draws ≤4000 µA in this state, and retention is valid across the full −40°C to +85°C temperature range.

What is the function of the CMD pin on IDT70825L25PF8, and when is it used?

The CMD pin on IDT70825L25PF8 enables access to internal control registers - including buffer start/end addresses, flow control mode, and EOB flag status. It is asserted LOW (CMD = VIL) while CE = VIH to enter command mode; during this mode, A0–A2 and I/O0–I/O12 are repurposed for register read/write, and normal memory access is disabled.