Renesas 70V9389L12PRF8

Overview

70V9389L12PRF8 from IDT (now part of Renesas) is a high-speed, 3.3V, synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous read/write access to the same address from left and right ports. It delivers 64K × 18-bit (or 64K × 16-bit) capacity, 12 ns pipelined clock-to-data access, 20 ns cycle time at 50 MHz, and operates across commercial temperature range (0°C to +70°C). It is used in real-time DSP co-processing, network packet buffering, and FPGA-based protocol bridging where deterministic latency and port independence are critical.

For engineers reviewing the 70V9389L12PRF8 datasheet, 70V9389L12PRF8 pinout, 70V9389L12PRF8 application, or 70V9389L12PRF8 equivalent, key selection considerations include pipelined vs. flow-through output mode timing, dual chip enable depth expansion capability, LVTTL-compatible 3.3V single-supply operation, and industrial-grade standby current specs - all validated for synchronous burst data transfer in telecom and embedded control systems.

Technical Context

The 70V9389L12PRF8 implements fully synchronous dual-port architecture with independent clock inputs (CLKL/CLKR), registered address/data/control paths, and self-timed write logic decoupled from clock edge timing. Its pipelined output mode achieves 7.5 ns clock-to-data-out with 12 ns cycle time, while flow-through mode supports 25 ns cycle time with zero-cycle hold on inputs.

It integrates dual address counters (CNTENL/CNTRSTL and CNTENR/CNTRSTR), separate upper/lower byte enables (UBL/LBL and UBR/LBR), and asynchronous output enable (OEL/OER) - enabling interleaved memory access, burst-mode addressing, and multiplexed bus compatibility without external glue logic.

Key Specifications

Pinout & Package

70V9389L12PRF8 is housed in a 128-pin Thin Quad Flatpack (TQFP) package measuring 14 mm × 20 mm × 1.4 mm, with 0.4 mm lead pitch and exposed thermal pad (not electrically connected). All VDD pins require local 3.3V decoupling; all VSS pins must be tied to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370KV18-200BZC and AS7C3256A-12JCIN, the 70V9389L12PRF8 uniquely delivers true dual-port concurrency, per-port output mode selection, and integrated address counters - making it irreplaceable in real-time inter-processor communication where deterministic latency and zero-wait-state burst access are mandatory.

Availability

70V9389L12PRF8 is available at Aetrix Electronics and suitable for telecom packet buffering, FPGA-based protocol bridging, and real-time industrial controller designs requiring stable component supply and long-term obsolescence management.

Supply support for 70V9389L12PRF8 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

IDT (Integrated Device Technology), now part of Renesas Electronics, is a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V9389L12PRF8 belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in telecom infrastructure, test equipment, and real-time embedded systems.

FAQ

What is the maximum operating frequency of the 70V9389L12PRF8 in pipelined mode?

The 70V9389L12PRF8 supports a 50 MHz maximum operating frequency in pipelined mode, derived from its 20 ns clock cycle time (tCYC2). This timing is guaranteed across the commercial temperature range (0°C to +70°C) with 3.3 V ± 0.3 V supply. The device achieves this using registered inputs and self-timed write logic, ensuring setup/hold margins are met without external timing constraints.

Does the 70V9389L12PRF8 support simultaneous read and write to the same memory location?

Yes, the 70V9389L12PRF8 uses true dual-ported memory cells that permit simultaneous read and write operations to the same address - one port reading while the other writes. This behavior is explicitly confirmed in the Functional Block Diagram and Truth Table I, and is fundamental to its use in producer-consumer FIFOs and real-time data exchange applications.

How does the FT/PIPE pin affect timing on the 70V9389L12PRF8?

On the 70V9389L12PRF8, the FT/PIPEL (left) and FT/PIPER (right) pins configure each port independently: VIH selects pipelined mode (7.5 ns clock-to-data, 20 ns cycle), while VIL selects flow-through mode (25 ns access, 0 ns hold). The mode setting affects internal register staging and output enable timing - verified in Timing Waveforms Figures 6–7 and AC Table 11a.

Can the 70V9389L12PRF8 be used for depth expansion without external logic?

Yes, the 70V9389L12PRF8 includes dual chip enables (CE0L/CE1L and CE0R/CE1R) per port, enabling direct depth expansion. For example, two devices can be stacked using A16 as a bank select - CE0L active on Device 0, CE1L active on Device 1 - with no additional gates required. This is documented in Figure 4 and Truth Table I of the datasheet.

What is the standby current consumption of the 70V9389L12PRF8 under full CMOS disable?

The 70V9389L12PRF8 draws 0.4 mA typical (max 2 mA) standby current (ISB3) when both ports are fully disabled using CMOS-level inputs (CE0/CE1 > VDD − 0.2 V and all inputs at rail). This ultra-low power state is achieved by powering down internal circuitry - confirmed in DC Electrical Characteristics Table 9a and specified for commercial-grade operation.