Renesas IDT70825L20PFI8

Overview

IDT70825L20PFI8 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 time, 20 ns tCD sequential access time, and 25 ns clock cycle time, operating on a single +5V ±10% supply. Used in real-time data buffering applications such as packet switching engines and video frame stores where concurrent read/write and streaming access are required.

For engineers reviewing the IDT70825L20PFI8 datasheet, IDT70825L20PFI8 pinout, IDT70825L20PFI8 application, or IDT70825L20PFI8 equivalent, key selection criteria include dual-port timing compatibility, 1 mW standby power consumption, industrial temperature range (–40°C to +85°C), and support for buffer chaining and end-of-buffer flagging in sequential mode.

Technical Context

The IDT70825L20PFI8 implements a Dual-Port RAM cell architecture with physically separate I/O paths: a TTL-compatible asynchronous random-access port (A0–A12, I/O0–I/O15, CE/OE/R/W/LB/UB) and a clocked sequential-access port (SCLK, SCE, SR/W, SLD, SSTRT1/SSTRT2, SI/O0–SI/O15). Both ports share the same 8K × 16 memory array but operate independently-enabling simultaneous streaming writes via sequential port while supporting random reads/writes via the other port.

It supports two internal flow-control buffers with programmable start/end addresses and four buffer modes (BUFFER CHAINING, STOP, LINEAR, MASK), managed via CMD register access using A0–A2 and I/O0–I/O12. EOB1/EOB2 flags signal buffer boundaries asynchronously, and RST provides asynchronous global reset of pointer, flags, and registers.

Key Specifications

Pinout & Package

Package: 80-pin Thin Quad Flatpack (TQFP), PN80-1, 14 mm × 14 mm × 1.4 mm body size, lead-free and RoHS-compliant per datasheet revision DSC-3016/10.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and IDT70V25L20PF, the IDT70825L20PFI8 uniquely combines 5 V operation, 2 V data retention, and hardware-managed dual-buffer flow control in a single 80-pin TQFP package - making it irreplaceable in industrial systems requiring robust brownout resilience and minimal firmware overhead for streaming buffer management.

Availability

IDT70825L20PFI8 is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure equipment, and broadcast video hardware requiring stable component supply across extended product lifecycles.

Supply support for IDT70825L20PFI8 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 power management ICs for communications, computing, and industrial markets.

The IDT70825L20PFI8 belongs to IDT's SARAM™ family, designed specifically to replace discrete FIFO + SRAM combinations in high-throughput, low-latency embedded systems requiring concurrent sequential and random memory access.

FAQ

What is the maximum clock frequency supported by the sequential port of IDT70825L20PFI8?

IDT70825L20PFI8 supports a 50 MHz maximum sequential port clock frequency, derived from its 25 ns minimum clock cycle time (tCYC). This allows sustained 50 MB/s data throughput on the SI/O0–SI/O15 bus when operating at rated speed, assuming no wait states and continuous CNTEN-enabled addressing.

Does IDT70825L20PFI8 support true simultaneous read/write across both ports?

Yes, IDT70825L20PFI8 supports true concurrent operation: the random-access port can execute a read while the sequential port performs a write, or vice versa, because both ports access the same memory array through independent, non-conflicting signal paths and internal arbitration logic - no external handshaking is required.

How is buffer chaining implemented in IDT70825L20PFI8, and what triggers the switch between buffers?

IDT70825L20PFI8 implements buffer chaining via its flow control register (bit 1:0 = 00). When the sequential address pointer reaches the end address of Buffer #1, EOB1 asserts LOW and the pointer automatically loads the start address of Buffer #2 on the next SCLK edge - enabling seamless circular streaming across two disjoint memory regions without CPU intervention.

Can IDT70825L20PFI8 retain data during power loss, and what is the minimum backup voltage?

Yes, IDT70825L20PFI8 supports data retention at VCC as low as 2.0 V, verified across the full industrial temperature range. When main supply drops below 4.5 V, the device enters data retention mode if SCE = VIH is clocked in before VCC falls below 2.0 V - preserving all memory contents and register states until power is restored.

What are the key differences between IDT70825L20PFI8 and the commercial-grade IDT70825S20PFI8?

IDT70825L20PFI8 differs from IDT70825S20PFI8 primarily in standby power (1 mW vs. 5 mW typ.) and temperature grade: IDT70825L20PFI8 is rated for –40°C to +85°C operation, while IDT70825S20PFI8 is commercial-grade (0°C to +70°C) and optimized for higher-speed applications where ambient thermal margins are less constrained.