Renesas IDT70825L20PFI

Overview

IDT70825L20PFI 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 20 ns tAA (random access), 20 ns tCD (sequential access), and 25 ns clock cycle time, operating on single +5V ±10% supply with 1 µA full-standby current (ISB3). It supports industrial temperature range (–40°C to +85°C) and battery-backed data retention at 2V.

For engineers reviewing the IDT70825L20PFI datasheet, IDT70825L20PFI pinout, IDT70825L20PFI application, or IDT70825L20PFI equivalent, key selection criteria include dual-port timing coordination, buffer chaining flow control, EOB flag management for DMA handshaking, and low-power operation in embedded buffering systems requiring simultaneous streaming and random lookup.

Technical Context

The IDT70825L20PFI implements a Dual-Port RAM cell architecture with physically separate ports: the random-access port uses TTL-compatible asynchronous control (CE, OE, R/W, LB/UB) and 13-bit address bus (A0–A12); the sequential port uses clocked synchronous interface (SCLK, SCE, SR/W, CNTEN) with internal 13-bit address pointer and two programmable buffers. Both ports share the same 8K × 16 memory array but operate independently-enabling concurrent streaming write via sequential port while servicing burst reads via random port.

It integrates dedicated flow-control logic including start/end address registers for Buffer #1 and #2, four configurable buffer modes (BUFFER CHAINING, STOP, LINEAR, MASK), and dual EOB flags (EOB1/EOB2) asserted on pointer match. Reset (RST) is asynchronous; SLD and SSTRT1/SSTRT2 enable precise pointer loading without clock dependency. Command mode (CMD = LOW) allows register access via A0–A2 and I/O0–I/O12.

Key Specifications

Pinout & Package

Package: 80-pin Thin Quad Flatpack (TQFP), PN80-1, body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm. RoHS-compliant, industrial temperature grade.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70825L20PFI, CY7C028V-20AC requires external state machines for buffer chaining and lacks integrated EOB assertion, increasing BOM count and layout complexity; IDT70V25L20PF offers lower power but mandates full voltage-domain redesign and forfeits 5V compatibility critical in legacy test and industrial systems.

Availability

IDT70825L20PFI is available at Aetrix Electronics and suitable for telecom line card buffering, industrial motion controller FIFOs, ATE pattern memory, medical imaging pipelines, and test equipment requiring stable component supply with long-lifecycle support.

Supply support for IDT70825L20PFI 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 sensor solutions for communications, computing, and industrial markets.

IDT70825L20PFI belongs to the SARAM™ family designed specifically for real-time embedded systems requiring deterministic dual-port memory access-targeting applications where streaming and random access must coexist without arbitration overhead or latency spikes.

FAQ

What is the primary function of the IDT70825L20PFI in a dual-port memory system?

The IDT70825L20PFI serves as a high-speed 8K × 16-bit Sequential Access Random Access Memory (SARAM™) that enables concurrent streaming via its synchronous sequential port and random lookup via its asynchronous random port. Its dual-port architecture eliminates arbitration delays, making it ideal for real-time buffering in telecom, test equipment, and motion control. The IDT70825L20PFI supports precise flow control through EOB flags and programmable buffer modes without external logic.

How does the IDT70825L20PFI manage power in standby mode?

The IDT70825L20PFI achieves ultra-low standby current of 0.2 mA (ISB3) when both ports are fully disabled using CMOS-level inputs (CE > VCC − 0.2 V and SCE > VCC − 0.2 V). This full-standby mode enables reliable battery-backed data retention down to 2.0 V, supporting extended hold times in power-constrained industrial systems. The IDT70825L20PFI also provides intermediate standby states (ISB1–ISB4) for partial port disablement.

Can the IDT70825L20PFI be used with a 3.3V controller interface?

No-the IDT70825L20PFI is a 5V-only device requiring VCC = 4.5 V to 5.5 V and TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V). It is not 3.3V-tolerant. Direct connection to 3.3V logic risks incorrect sampling or damage. For 3.3V systems, consider the pin-compatible IDT70V25L20PF-but note it requires full voltage-domain redesign and lacks 5V interoperability. The IDT70825L20PFI remains optimal for legacy 5V infrastructure.

What buffer flow modes does the IDT70825L20PFI support, and how are they configured?

The IDT70825L20PFI supports four per-buffer flow modes: BUFFER CHAINING, STOP, LINEAR, and MASK-configured via bits 1:0 (Buffer #1) and bits 3:2 (Buffer #2) in the flow control register accessed in CMD mode. These modes define pointer behavior at end-of-buffer addresses and EOB flag assertion. Configuration is performed using A0–A2 and I/O0–I/O12 while CMD = LOW and CE = HIGH. The IDT70825L20PFI defaults to BUFFER CHAINING after RST.

How are the EOB1 and EOB2 flags used in system-level design?

EOB1 and EOB2 are active-low, open-drain outputs signaling when the sequential port's address pointer matches the programmed end address of Buffer #1 or #2. They serve as hardware handshake signals-typically connected to an interrupt input or DMA request line-to trigger software actions (e.g., reload buffer, switch context, or assert ready). Both flags can be cleared by writing to the command register or asserting RST. The IDT70825L20PFI guarantees deterministic timing: EOB asserts within one SCLK cycle of pointer match.