Renesas 7005L20JI8

Overview

7005L20JI8 from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 20 ns maximum read cycle time (tRC), 2 V data retention capability, and integrated hardware semaphore/arbitration logic - used in real-time inter-processor communication systems requiring simultaneous access to shared memory without external logic.

For engineers reviewing the 7005L20JI8 datasheet, 7005L20JI8 pinout, 7005L20JI8 application, or 7005L20JI8 equivalent, key selection criteria include its 20 ns industrial-grade timing, master/slave cascading support via M/S pin, BUSY/INT flag signaling, and low-power standby current of 1 µA typical at 2 V battery backup.

Technical Context

The 7005L20JI8 implements fully asynchronous dual-port operation: each port (left/right) has dedicated address (A0L–A12L / A0R–A12R), data (I/O0L–I/O7L / I/O0R–I/O7R), and control lines (CEL/CER, R/WL/R/WR, OEL/OER), enabling concurrent reads/writes to any memory location. It supports both CE-controlled and R/W-controlled write cycles with defined tEW, tWP, and tDW timing windows.

On-chip arbitration uses push-pull BUSY outputs (when M/S = H) or BUSY inputs (M/S = L) to resolve port contention, with tAPS = 5 ns arbitration priority setup time. Semaphore flags (8 total, addressed by A0–A2) are accessed via dedicated SEM pins and operate independently of main memory array access.

Key Specifications

Pinout & Package

64-pin thin quad flatpack (TQFP, package code PNG64), body size 14 mm × 14 mm × 1.4 mm, with 4 ground pins (pins 3, 17, 32, 49), 4 VCC pins (pins 2, 16, 37, 64), and dual-port signal symmetry (left/right I/O, address, and control).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AC and IS61LV5128-20TQLI, the 7005L20JI8 uniquely delivers true dual-port operation with hardware semaphore, 2 V data retention, and industrial temperature rating in a compact 64-pin TQFP - reducing system-level complexity and component count.

Availability

7005L20JI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, avionics data concentrators, and industrial PLC memory expansion requiring stable component supply across extended product lifecycles.

Supply support for 7005L20JI8 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) is a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT7005 family was designed specifically for deterministic, low-latency inter-processor memory sharing - targeting applications where software-managed synchronization introduces unacceptable jitter or overhead.

FAQ

What is the guaranteed maximum access time for the 7005L20JI8 under industrial temperature conditions?

The 7005L20JI8 is specified for a maximum read cycle time (tRC) of 20 ns across the full industrial temperature range (−40°C to +85°C), as confirmed in Table 13a of the official datasheet. This timing applies to both ports independently and includes all internal propagation delays - no derating is required for temperature or voltage variation within rated 5.0 V ±10% supply.

Does the 7005L20JI8 support battery backup operation, and what is the minimum retention voltage?

Yes, the 7005L20JI8 supports battery backup operation with guaranteed data retention down to 2.0 V (VDR), as specified in Table 9. At this voltage, typical data retention current is 100 µA, enabling multi-year backup with standard coin-cell batteries. The L-suffix denotes low-power variant optimized for this mode.

How does the M/S pin affect BUSY signal behavior in the 7005L20JI8?

When M/S = H, BUSYL and BUSYR function as push-pull outputs indicating port contention status; when M/S = L, they become inputs accepting BUSY assertions from a master device. This configuration enables hierarchical arbitration in multi-chip systems - the 7005L20JI8 must be configured as slave (M/S = L) when cascaded with another 7005L20JI8 acting as master.

Can the 7005L20JI8 perform simultaneous reads from both ports to the same memory address?

Yes, the 7005L20JI8 uses true dual-port memory cells that allow simultaneous reads from both left and right ports to identical addresses without contention, corruption, or timing penalty. This capability is fundamental to its architecture and is explicitly stated in the Features section of the datasheet.

What are the valid address ranges for setting and clearing interrupt flags in the 7005L20JI8?

Interrupt flags are controlled via dedicated addresses: writing to address 1FFFH sets the opposite port's interrupt flag (e.g., left port write to 1FFFH sets INTR), while writing to 1FFEH clears it. These addresses are fixed and do not depend on memory mapping - they trigger flag state changes regardless of data value written, as defined in Truth Table III.