Renesas 7005L20J8

Overview

7005L20J8 from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 20 ns max read cycle time (tRC), 1 mW typical standby power, and full on-chip semaphore/arbitration logic for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7005L20J8 datasheet, 7005L20J8 pinout, 7005L20J8 application, or 7005L20J8 equivalent, this page delivers verified timing specs, master/slave port arbitration behavior, BUSY/INT signal timing, battery-backed data retention at 2V, and TQFP-64 package compatibility for industrial motion controllers and telecom line cards.

Technical Context

The 7005L20J8 implements fully asynchronous dual-port operation with separate address, data, and control buses per port (A0L–A12L/I/O0L–I/O7L/R/WL/CEL/OEL/BUSYL/INTL/SEML on left; mirrored on right), enabling simultaneous reads-even to the same memory location-without contention.

Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion (output when M/S = H, input when M/S = L) and supports semaphore signaling across ports using A0–A2 to select one of eight flags, with tSPS = 5 ns contention window and tSWRD = 5 ns write-to-read latency.

Key Specifications

Pinout & Package

7005L20J8 is housed in a 64-pin thin quad flatpack (TQFP) with 0.5 mm lead pitch and 14 mm × 14 mm body size. All VCC pins require decoupling; all GND pins must be solidly connected to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20JC and IS61LV5128-20TQLI, the 7005L20J8 uniquely integrates hardware semaphore, master/slave arbitration, and 2V data retention - making it irreplaceable in deterministic real-time inter-processor communication where timing predictability and power-fail resilience are mandatory.

Availability

7005L20J8 is available at Aetrix Electronics and suitable for industrial motion control, avionics data recorders, and telecom line cards requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7005L20J8 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 real-time embedded systems requiring deterministic inter-processor communication, offering integrated arbitration, semaphore, and BUSY signaling to eliminate external logic in dual-CPU architectures.

FAQ

What is the maximum operating frequency supported by the 7005L20J8?

The 7005L20J8 supports a maximum read cycle time (tRC) of 20 ns, corresponding to a theoretical 50 MHz operation per port. Because both ports operate fully asynchronously, each can sustain independent 50 MHz access - not a shared 50 MHz bus. This is confirmed in Table 13a for the "7005X20" speed grade under Commercial, Industrial, and Military temperature ranges.

Does the 7005L20J8 support battery backup operation, and what voltage is required?

Yes, the 7005L20J8 supports battery backup with guaranteed data retention at 2.0 V (VDR), as specified in Table 9. Its low 1 mW typical standby current (ISB3) enables multi-year operation from a standard 2V lithium coin cell. This feature is exclusive to the "L" (low-power) variant and is validated across all temperature grades.

How does the M/S pin affect BUSY signal behavior on the 7005L20J8?

When M/S = H, BUSYL and BUSYR function as push-pull outputs that assert LOW to block conflicting writes on the opposite port. When M/S = L, BUSYL and BUSYR become inputs used to receive BUSY signals from a master device. This dual-role behavior is defined in Note 1 of the Pin Names table and Figure 13 waveform, and is fundamental to master/slave cascading.

Can the 7005L20J8 perform simultaneous reads from both ports to the same memory address?

Yes, the 7005L20J8 uses true dual-ported memory cells that allow concurrent reads to identical addresses on left and right ports without conflict, delay, or data corruption. This capability is explicitly stated in the Features section ("True Dual-Ported memory cells which allow simultaneous reads of the same memory location") and is a core architectural differentiator from pseudo-dual-port or pipelined SRAMs.

What is the purpose of the semaphore function, and how many flags does the 7005L20J8 provide?

The 7005L20J8 provides eight hardware semaphore flags, selected by address bits A0–A2 on either port. These flags coordinate resource access between processors - e.g., one port writes "1" to flag 0 to claim a shared peripheral, the other reads it to wait. Timing parameters tSPS = 5 ns and tSWRD = 5 ns ensure deterministic, low-latency flag exchange without software overhead.