Renesas 7008L35J8

Overview

IDT7008L35J8 from Integrated Device Technology (IDT) is a high-speed 64K × 8 true dual-ported static RAM with independent left/right ports, 35 ns maximum access time, TTL-compatible 5 V ±10% supply, and integrated BUSY arbitration logic. It enables simultaneous asynchronous reads from both ports to the same memory location and supports MASTER/SLAVE cascading for 16-bit+ data bus expansion in real-time embedded control systems.

For engineers reviewing the IDT7008L35J8 datasheet, IDT7008L35J8 pinout, IDT7008L35J8 application, or IDT7008L35J8 equivalent, key selection criteria include port-to-port contention resolution timing (tBDD ≤ 35 ns), low standby power (1 mW typ.), semaphore flag support (8 flags via A0–A2), and compatibility with industrial temperature range (–40°C to +85°C) operation.

Technical Context

The IDT7008L35J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves port conflicts using either address-match detection (tBAA ≤ 20 ns) or CE-controlled timing, with BUSY outputs asserted as push-pull (not open-drain) signals.

It supports two distinct memory access modes: standard RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH, SEM = VIL), where eight semaphore flags are addressed by A0–A2 and written via I/O0 only. Interrupt signaling uses dedicated mailbox addresses FFFE_H (left port INTL) and FFFF_H (right port INTR).

Key Specifications

Pinout & Package

Package: 100-pin TQFP (Thin Quad Flatpack), body size ≈ 1.12 in × 1.12 in × 0.16 in, lead pitch 0.5 mm, RoHS-compliant green variant available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-55JC and IS61LV5128-10TL, the IDT7008L35J8 uniquely delivers hardware-enforced atomicity for shared memory access, reducing BOM count by eliminating discrete arbitration ICs and cutting firmware development time for synchronization primitives by >70%.

Availability

IDT7008L35J8 is available at Aetrix Electronics and suitable for motor control systems, industrial PLCs, avionics data recorders, and medical imaging subsystems requiring stable component supply with guaranteed long-term availability.

Supply support for IDT7008L35J8 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs for communications, computing, and industrial markets.

The IDT7008L35J8 belongs to IDT's high-speed dual-port SRAM product line, engineered specifically for deterministic real-time embedded systems where concurrent multi-processor access to shared memory must be resolved in hardware without software intervention.

FAQ

What is the maximum operating temperature range certified for the IDT7008L35J8?

The IDT7008L35J8 is specified for industrial temperature operation from –40°C to +85°C. This rating is validated across all electrical parameters including access time (35 ns max), standby current (1 mW typ.), and BUSY arbitration timing (tBDD ≤ 35 ns). The device uses CMOS process technology optimized for thermal stability in harsh environments such as factory automation controllers and railway signaling equipment.

How does the IDT7008L35J8 resolve simultaneous write attempts to the same memory address?

The IDT7008L35J8 resolves simultaneous writes using hardware BUSY arbitration: when both ports attempt access to identical addresses, the BUSY output asserts within tBAC ≤ 20 ns (from CE low) to block the later-arriving write. The winning port is determined by tAPS = 5 ns setup time - the port whose address and enable signals stabilize first gains exclusive access. This eliminates race conditions without software polling or external logic.

Can the IDT7008L35J8 operate with only one port enabled while the other remains powered down?

Yes, the IDT7008L35J8 supports asymmetric power management: setting CE0R and CE1R to VIH disables the right port's circuitry, reducing ISB2 standby current to 80 mA (typ.) while the left port remains fully operational. This mode maintains full 35 ns access performance on the active port and preserves semaphore/interrupt functionality for the enabled side, ideal for power-gated subsystem architectures.

What package type is used for the IDT7008L35J8 and what are its mechanical dimensions?

The IDT7008L35J8 is packaged in a 100-pin TQFP with body dimensions approximately 1.12 in × 1.12 in × 0.16 in (28.5 mm × 28.5 mm × 4.1 mm) and 0.5 mm lead pitch. This RoHS-compliant green package provides superior thermal dissipation over PGA/PLCC alternatives and supports automated optical inspection in high-reliability manufacturing lines.

Does the IDT7008L35J8 require external pull-up resistors on its INTL and INTR pins?

No, the IDT7008L35J8's INTL and INTR pins are push-pull (totem-pole) outputs, not open-drain. They drive actively high or low without external pull-ups. When asserted, they sink ≥4 mA at VOL ≤ 0.4 V; when de-asserted, they source ≥4 mA at VOH ≥ 2.4 V. This simplifies interface design with microcontrollers and eliminates risk of floating states during power sequencing.