Renesas IDT70824S25PF

Overview

IDT70824S25PF from Integrated Device Technology is a high-speed 4K × 16-bit Sequential Access Random Access Memory (SARAM™) with dual-port architecture: one asynchronous random-access port and one synchronous sequential-access port. It delivers 25 ns clock cycle time, 20 ns random-access tAA, and 20 ns sequential-access tCD, operating on a single +5V ±10% TTL-compatible supply. It supports battery backup with 2V data retention and is used in real-time buffering applications such as PCI-based video frame capture and digital signal processing pipelines.

For engineers reviewing the IDT70824S25PF datasheet, IDT70824S25PF pinout, IDT70824S25PF application, or IDT70824S25PF equivalent, key selection criteria include dual-port timing coordination, buffer chaining capability across two internal buffers, byte-selectable random access (LB/UB), and military-grade reliability in TQFP packaging - all critical for deterministic data flow in embedded control and communications systems.

Technical Context

The IDT70824S25PF implements a CMOS-based Dual-Port RAM core with physically separate address/data/control paths for its random-access (asynchronous, CE/OE/R/W-driven) and sequential-access (synchronous, SCLK/SCE/SR/W-driven) ports. Its pointer logic supports two independently configurable buffers with start/end address registers and EOB1/EOB2 status flags.

Buffer flow modes - BUFFER CHAINING and STOP - are controlled via a dedicated CMD register accessed through A0–A2 and I/O0–I/O11, enabling flexible circular or bounded sequential data streaming without CPU intervention. The device retains data at 2V and enters ultra-low-power standby (5 mW typ.) when CE and SCE are deasserted.

Key Specifications

Pinout & Package

Package: 80-pin Thin Quad Flatpack (TQFP), PN80-1, body size 14 mm × 14 mm × 1.4 mm. All 7 VCC and 10 GND pins must be connected per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362AV-25AXC and IDT70V25S25PF, the IDT70824S25PF uniquely integrates hardware-managed sequential addressing and dual EOB flags in a 5V TTL package - making it irreplaceable in cost-sensitive, mixed-signal industrial systems requiring zero-software buffer management.

Availability

IDT70824S25PF is available at Aetrix Electronics and suitable for PCI interface design, real-time motion control, telecom packet buffering, and industrial data logging requiring stable component supply over extended production lifecycles.

Supply support for IDT70824S25PF 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, and interface solutions for communications, computing, and industrial markets.

The IDT70824S25PF belongs to IDT's SARAM™ family - engineered specifically for deterministic, low-latency dual-port buffering in systems where synchronous data ingestion and asynchronous processing must coexist without CPU overhead.

FAQ

What is the maximum operating frequency of the sequential access port on the IDT70824S25PF?

The IDT70824S25PF sequential port supports a maximum clock cycle time of 25 ns, corresponding to a 40 MHz SCLK frequency. This is guaranteed across the full industrial temperature range (–40°C to +85°C) and under worst-case voltage (4.5 V) and process conditions. The tCD parameter remains ≤20 ns at this rate, ensuring reliable setup/hold timing for SI/O data capture on each rising edge of SCLK.

Does the IDT70824S25PF support true simultaneous read/write between ports?

Yes, the IDT70824S25PF supports true concurrent access: the random-access port can perform a read or write while the sequential-access port executes a read, write, or pointer update - provided CE and SCE are not both asserted low simultaneously. Internal arbitration prevents bus contention, and the dual-port RAM cell structure guarantees data integrity without external logic.

How is buffer chaining implemented in the IDT70824S25PF?

Buffer chaining in the IDT70824S25PF is configured via bits 1:0 of the Flow Control Register (accessed in CMD mode). When set to '00', reaching the end address of Buffer #1 automatically reloads the pointer with Buffer #2's start address - and vice versa. This enables seamless circular streaming across two disjoint memory regions without CPU intervention or SCLK cycle gaps.

Can the IDT70824S25PF retain data during a complete power loss?

The IDT70824S25PF supports data retention down to 2.0 V VCC, but not at 0 V. For full power-loss protection, an external battery or supercapacitor must maintain VCC ≥2.0 V during outage. The device draws ≤100 µA in retention mode (per datasheet Table 9), allowing typical coin-cell batteries to sustain data for weeks. RST must remain inactive (HIGH) during retention.

Is the IDT70824S25PF pin-compatible with other members of the IDT70824 family?

The IDT70824S25PF shares identical 80-pin TQFP pinout with all IDT70824x25PF variants (e.g., IDT70824L25PF), differing only in standby current and temperature grading. However, it is not pin-compatible with PGA-packaged versions (e.g., IDT70824S25G) or speed grades outside the 25 ns family (e.g., 20 ns or 35 ns), which use distinct pin mappings for timing-critical signals like SCLK and CNTEN.