Renesas 70V9289L9PRFGI8

Overview

70V9289L9PRFGI8 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, 9ns pipelined clock-to-data access, industrial temperature range (–40°C to +85°C), and operates at 83MHz in pipelined mode - used in real-time DSP co-processing, FPGA-based communication buffers, and redundant control systems.

For engineers reviewing the 70V9289L9PRFGI8 datasheet, 70V9289L9PRFGI8 pinout, 70V9289L9PRFGI8 application, or 70V9289L9PRFGI8 equivalent, key selection criteria include its dual-port synchronous timing compliance, 128-pin TQFP package with separate byte enables, flow-through/pipelined output mode selectability, counter enable/reset functionality, and low-power standby operation (1.5mW typ.) - all critical for deterministic latency and bus-matching in high-throughput embedded memory subsystems.

Technical Context

The 70V9289L9PRFGI8 implements fully synchronous operation on both ports with 4ns setup/0ns hold timing on all inputs, using edge-triggered registers for address, data, and control signals. Its self-timed write architecture decouples internal write pulse generation from clock edge timing, enabling minimal cycle time.

It supports two configurable output modes: flow-through (data valid after one clock) and pipelined (data valid after one clock with registered output), selected per port via FT/PIPE pins. Dual chip enables (CE0/CE1) allow depth expansion without external logic, while independent upper/lower byte controls (UB/LB) support multiplexed bus interfacing and 16-/18-bit width flexibility.

Key Specifications

Pinout & Package

70V9289L9PRFGI8 is housed in a 128-pin Thin Quad Flatpack (TQFP) measuring 14mm × 20mm × 1.4mm, with exposed thermal pad (not electrically connected). All VDD pins require local 3.3V decoupling; all VSS pins must be solidly grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-133AXC and AS7C36256B-12JIN, the 70V9289L9PRFGI8 uniquely combines synchronous pipelined timing, per-port output mode selection, and integrated address counter - making it optimal for FPGA/DSP co-processing where latency predictability and burst efficiency are jointly critical.

Availability

70V9289L9PRFGI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control systems, and FPGA-based accelerator modules requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V9289L9PRFGI8 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, specialized in high-performance timing, memory, and interface ICs for communications, computing, and industrial markets.

The 70V9289L9PRFGI8 belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency memory sharing between heterogeneous processors, FPGAs, and ASICs in real-time embedded systems.

FAQ

What is the maximum operating frequency of the 70V9289L9PRFGI8 in pipelined mode?

The 70V9289L9PRFGI8 supports up to 83MHz operation in pipelined output mode, corresponding to a 15ns maximum clock cycle time (tCYC2) over the industrial temperature range. This is verified in the AC Electrical Characteristics table (Table 11a) of the official datasheet, with timing validated at –40°C to +85°C and VDD = 3.3V ± 0.3V. The 70V9289L9PRFGI8 achieves this performance without external PLLs or timing compensation circuits.

Does the 70V9289L9PRFGI8 support independent output modes on left and right ports?

Yes, the 70V9289L9PRFGI8 supports independent output mode selection per port via dedicated FT/PIPEL and FT/PIPER pins. When FT/PIPE = VIH, the port operates in pipelined mode (1-cycle registered output); when FT/PIPE = VIL, it operates in flow-through mode (combinatorial output). This capability is explicitly documented in the Features section and Truth Table I, enabling asymmetric latency configurations - for example, left port in pipelined mode for streaming, right port in flow-through for low-latency control reads.

What is the function of the CNTEN and CNTRST pins on the 70V9289L9PRFGI8?

The CNTEN (Counter Enable) and CNTRST (Counter Reset) pins on the 70V9289L9PRFGI8 control an integrated address counter per port. When CNTEN = VIL on the rising clock edge, the counter advances to the next address; CNTRST = VIL loads address zero synchronously. These functions are detailed in Truth Table III and Figure 16 of the datasheet, and are used to eliminate external address generation logic in burst-access applications such as FIFO emulation or DMA transfers - directly reducing host processor load and system complexity.

Is the 70V9289L9PRFGI8 pin-compatible with other members of the IDT70V9389/289 family?

The 70V9289L9PRFGI8 shares the same 128-pin TQFP package and pinout as the 70V9389L9PRFGI8, as confirmed by Pin Configuration drawings 4856 drw 02b and 4856 drw 02. Both devices use identical pin assignments for CLK, R/W, CE, UB/LB, and I/O banks. However, functional differences exist: the 70V9289L9PRFGI8 is specified for 64K × 18/16 organization with I/O0–I/O15 mapping, whereas 70V9389L9PRFGI8 supports 64K × 18/16 but with different I/O grouping per datasheet note - requiring verification against specific memory map requirements before substitution.

What power-saving features does the 70V9289L9PRFGI8 offer in standby mode?

The 70V9289L9PRFGI8 offers multiple standby power states: full standby (ISB3) draws just 0.4mA typ. when both ports are deselected with CMOS-level inputs; single-port standby (ISB4) consumes 100mA typ. when one port is active. These values are specified in Table 9a of the datasheet. Power-down is controlled per port via CE0/CE1 - asserting CE0 = VIH or CE1 = VIL disables internal circuitry, reducing active current from 200mA typ. to sub-mA levels without requiring clock gating or voltage scaling.