Renesas IDT70825S35PF8

Overview

IDT70825S35PF8 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 35 ns max random-access access time (tAA), 35 ns clock cycle time for sequential port, and supports independent upper/lower-byte control via LB/UB pins. Used in real-time data buffering applications such as packet switching engines and video frame stores where concurrent streaming and random lookup are required.

For engineers reviewing the IDT70825S35PF8 datasheet, IDT70825S35PF8 pinout, IDT70825S35PF8 application, or IDT70825S35PF8 equivalent, this page provides verified functional identity, validated 80-pin TQFP package mapping, confirmed dual-port timing behavior, battery-backed 2V data retention capability, and two field-validated alternative parts with documented interface and power differences.

Technical Context

The IDT70825S35PF8 implements a Dual-Port RAM cell architecture with physically separate address/data/control paths for its random-access (asynchronous SRAM-style) and sequential-access (clocked counter-driven) ports. The random port uses TTL-compatible 5V signaling with CE/OE/R/W/LB/UB controls, while the sequential port operates synchronously on SCLK with SCE/SR/W/CNTEN/SLD/SSTRT1/SSTRT2 and SI/O0–SI/O15 signals.

It integrates two independently configurable flow-controlled buffers (Buffer #1 and #2), each with programmable start/end addresses and four buffer modes (BUFFER CHAINING, STOP, LINEAR, MASK). EOB1/EOB2 flags signal end-of-buffer conditions, and RST provides asynchronous global reset of pointer, registers, and flags - all verified in the January 2009 datasheet DSC-3016/10.

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. Pin 1 marked by corner notch; pin numbering follows standard counter-clockwise convention from top-left.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70825S35PF8, CY7C028V-25AXC offers faster access but demands voltage translation and board rework, while IDT70V25S25PF8 delivers plug-compatible speed improvement at modest power cost - making it the preferred drop-in alternative for timing-sensitive upgrades.

Availability

IDT70825S35PF8 is available at Aetrix Electronics and suitable for packet switching, broadcast video processing, industrial data logging, and medical imaging preprocessing requiring stable component supply across extended production lifecycles.

Supply support for IDT70825S35PF8 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs before its acquisition by Renesas in 2019. Known for high-reliability, high-speed memory and clock solutions.

IDT70825S35PF8 belongs to IDT's SARAM™ family - designed specifically for real-time systems needing concurrent streaming and random access to shared memory without external arbitration or glue logic.

FAQ

What is the function of the CMD pin on the IDT70825S35PF8?

The CMD pin on the IDT70825S35PF8 enables Control Register Mode: when CMD = LOW and CE = HIGH, address lines A0–A2 and I/O0–I/O12 access internal configuration registers including buffer start/end addresses, flow control mode, and EOB flag status. This mode is mutually exclusive with normal random-access operation - CE and CMD must not both be LOW simultaneously, as specified in the January 2009 datasheet DSC-3016/10.

Does the IDT70825S35PF8 support true simultaneous read/write between ports?

Yes, the IDT70825S35PF8 supports true concurrent access: the random-access port (asynchronous) and sequential-access port (synchronous) operate independently with separate address/data/control buses. No internal arbitration is required, and neither port blocks the other - verified by the functional block diagram and truth tables in the IDT70825S/L datasheet DSC-3016/10.

What is the purpose of the EOB1 and EOB2 pins on the IDT70825S35PF8?

EOB1 and EOB2 are active-low, open-drain end-of-buffer flag outputs on the IDT70825S35PF8. EOB1 asserts when the sequential port address pointer matches the programmed end address of Buffer #1; EOB2 does the same for Buffer #2. These flags enable hardware handshaking for DMA controllers or FPGA state machines managing buffer boundaries - and can be cleared via RST or CMD-mode register write.

Can the IDT70825S35PF8 retain data during power loss?

Yes, the IDT70825S35PF8 supports battery-backed data retention down to VCC = 2.0 V, as confirmed in Table 9 (Data Retention Characteristics) of the DSC-3016/10 datasheet. At 2 V, it draws ≤4000 µA (typ. 100 µA) and maintains stored data indefinitely - enabling use in systems with backup capacitors or coin-cell batteries for nonvolatile logging.

Is the IDT70825S35PF8 pin-compatible with other members of the IDT70825 family?

Yes, the IDT70825S35PF8 shares identical 80-pin TQFP pinout and register-level compatibility with all speed grades (e.g., IDT70825S25PF8, IDT70825S20PF8) and power variants (IDT70825LxxPF8) in the same package. Differences are limited to AC timing parameters and standby current - allowing direct substitution in layouts designed for the PF8 footprint without hardware changes.