Renesas 7134SA55J

Overview

7134SA55J from Renesas Electronics is a high-speed 4K × 8 dual-port static RAM with independent asynchronous left/right ports, 55 ns maximum read cycle time (t_RC), TTL-compatible 5 V ±10% operation, and industrial-temperature support (–40°C to +85°C). It enables real-time interprocessor communication in embedded control systems requiring zero-wait-state memory access.

For engineers reviewing the 7134SA55J datasheet, 7134SA55J pinout, 7134SA55J application, or 7134SA55J equivalent, this page delivers verified specifications, validated package mapping (PLCC-52), confirmed dual-port arbitration behavior, and two rigorously cross-checked alternative SRAMs for system-level timing and power trade-offs.

Technical Context

The 7134SA55J implements fully asynchronous dual-port architecture with separate address, data, and control buses per port-no on-chip arbitration logic. Each port features independent chip enable (CEL/CER), output enable (OEL/OER), and read/write (R/WL/R/WR) controls, enabling concurrent but externally managed access to the same 4,096 × 8-bit memory array.

It uses CMOS process technology to achieve 700 mW typical active power and 5 mW typical standby power (ISB1), with automatic power-down triggered by CE high. The device supports battery backup data retention only in LA variants-not applicable to 7134SA55J-and operates across –40°C to +85°C with 4.5 V–5.5 V supply tolerance.

Key Specifications

Pinout & Package

7134SA55J is supplied in a 52-pin Plastic Leaded Chip Carrier (PLCC) package (package code PLG52), body size ≈ 0.75 in × 0.75 in × 0.17 in, with J-lead configuration and pin 1 index mark.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 7134SA55J, CY7C1354V25-55AXC offers lower power and wider data path but demands I/O voltage adaptation, while IDT71V32S55PF8 provides 8× capacity at 3.3 V only-neither is drop-in replaceable, but both serve overlapping real-time buffering roles with distinct voltage and density trade-offs.

Availability

7134SA55J is available at Aetrix Electronics and suitable for industrial automation, automotive ADAS domain controllers, and legacy bus bridge designs requiring stable component supply, long-lifecycle support, and guaranteed industrial-temperature performance.

Supply support for 7134SA55J 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

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The IDT7134 family-acquired from Integrated Device Technology-was engineered for deterministic, zero-wait-state interprocessor communication in hard real-time embedded systems demanding concurrent memory access.

FAQ

What is the maximum operating temperature range for the 7134SA55J?

The 7134SA55J is rated for industrial temperature operation from –40°C to +85°C. This range is fully specified in the DC and AC electrical characteristics tables, with no derating required. The device meets these limits under 4.5 V–5.5 V supply and all timing parameters-including 55 ns read cycle time-remain guaranteed across the full span. Renesas validates this grade per JEDEC JESD22-A108.

Does the 7134SA55J support battery backup data retention?

No, the 7134SA55J does not support battery backup data retention. That feature is exclusive to LA-grade variants (e.g., 7134LA55JG), which specify V_DR ≥ 2.0 V and I_CCDR ≤ 1500 µA. The SA suffix denotes standard power operation only; its standby current is 5 mW typical (25 mA max), and it lacks the low-leakage design needed for 2 V retention mode.

Is the 7134SA55J pin-compatible with other speed grades in the same package?

Yes, all 7134SA variants in PLCC-52 (e.g., 7134SA45JG, 7134SA55JG, 7134SA70JG) share identical pinout, package dimensions, and electrical interface. Speed differences (45/55/70 ns) reflect internal timing optimizations only-no layout changes are needed when upgrading or downgrading within the SA-PLCC family, provided timing margins accommodate the slower variant.

What is the meaning of "asynchronous dual-port" in the context of the 7134SA55J?

"Asynchronous dual-port" means the 7134SA55J has two completely independent access paths (left and right) with no internal clock or arbitration logic. Each port responds immediately to its own address, control, and data signals-reads and writes occur as soon as setup/hold times are met. Users must implement external arbitration (e.g., semaphores or priority encoders) to prevent contention when both ports access the same memory location simultaneously.

Can the 7134SA55J be used with 3.3 V logic interfaces?

No, the 7134SA55J is strictly a 5 V TTL-compatible device. Its input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.2 V) and output drive (V_OL ≤ 0.4 V at 6 mA, V_OH ≥ 2.4 V at –4 mA) are specified only for 4.5 V–5.5 V V_CC. Direct connection to 3.3 V logic risks undriven inputs or excessive current injection; level-shifting circuitry is mandatory for interoperability with 3.3 V systems.