Renesas 7134LA20JG

Overview

7134LA20JG from Renesas Electronics is a high-speed 4K × 8 dual-port static RAM with independent left/right asynchronous ports, 20 ns read cycle time (max), 5 V ±10% single-supply operation, and 1 µA typical standby current per port - designed for real-time inter-processor communication in avionics data concentrators.

For engineers reviewing the 7134LA20JG datasheet, 7134LA20JG pinout, 7134LA20JG application, or 7134LA20JG equivalent, this page delivers verified timing parameters, dual-port arbitration behavior, battery-backed data retention at 2 V, PLCC-52 package mapping, and direct alternatives for industrial-grade dual-port SRAM replacement.

Technical Context

The 7134LA20JG implements fully asynchronous dual-port access with separate address, control, and I/O buses for left (L) and right (R) sides - no on-chip arbitration logic required. Each port features independent CE, OE, R/W, and address decoding, enabling concurrent reads/writes to distinct memory locations without contention.

Its low-power LA variant supports true data retention at V_CC = 2 V with ≤4 mA retention current across military temperature range (–55°C to +125°C), while maintaining TTL-compatible input thresholds and CMOS-level output drive capability under 5 V supply.

Key Specifications

Pinout & Package

7134LA20JG is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC, package code PLG52), body size 0.75 in × 0.75 in × 0.17 in, with J-lead configuration and pin 1 index marker. All V_CC and GND pins must be externally decoupled per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 7134LA20JG, CY7C1354V25 offers lower voltage operation but requires external level shifters in legacy 5 V systems and omits data retention - whereas IDT71V3204S20PFGI provides greater density and parity but sacrifices the critical 2 V hold function essential for power-fail resilience.

Availability

7134LA20JG is available at Aetrix Electronics and suitable for avionics data concentrators, industrial PLC dual-CPU interfaces, medical imaging frame buffers, and test equipment pattern generators requiring stable component supply across extended production lifecycles.

Supply support for 7134LA20JG 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 Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The IDT7134 family - acquired from Integrated Device Technology - was engineered specifically for deterministic, contention-tolerant dual-processor memory sharing in safety-critical real-time systems.

FAQ

What is the maximum operating frequency supported by the 7134LA20JG?

The 7134LA20JG supports a maximum read cycle time of 20 ns, corresponding to a theoretical 50 MHz sustained access rate per port. This value is guaranteed across commercial temperature range (0°C to +70°C) with V_CC = 4.5 V to 5.5 V. Actual system clocking depends on external address setup/hold timing and bus loading - the 7134LA20JG itself imposes no internal clock requirement due to its fully asynchronous architecture.

Does the 7134LA20JG support true dual-port contention resolution?

No, the 7134LA20JG does not include on-chip arbitration logic. When both ports simultaneously access the same memory location, bus contention must be resolved externally by the system designer - typically via semaphore registers or external priority encoders. The 7134LA20JG provides the physical dual-port interface and timing margins (e.g., tWDD, tDDD) to support such external schemes, but does not prevent or manage collisions autonomously.

Can the 7134LA20JG retain data during main power failure?

Yes, the 7134LA20JG supports guaranteed data retention at V_CC = 2.0 V minimum, drawing ≤4 mA total current in retention mode. This feature is exclusive to LA variants (not SA) and is validated across the full commercial temperature range. External backup power must be applied to V_CC - no separate V_BAT pin exists - and all control signals must remain static during retention.

What is the pin 1 orientation for the PLCC-52 package of the 7134LA20JG?

Per Renesas documentation (drawing 2720 drw 03), the 7134LA20JG in PLG52 package uses a corner-indexed PLCC footprint with pin 1 located at the top-left corner when the index notch faces upward. The body marking "7134" appears adjacent to pin 1, and the lead count proceeds counter-clockwise. This orientation matches JEDEC standard MO-047AB for 52-pin PLCC devices.

How does the 7134LA20JG handle simultaneous read and write operations on different addresses?

The 7134LA20JG permits fully independent, asynchronous read and write operations on distinct memory addresses - e.g., reading from address 0x0100 on the left port while writing to 0x0200 on the right port. No timing interlock or delay is required between ports. Each port operates with its own t_RC, t_WC, and enable timing, enabling true parallelism as long as address collision is avoided by system-level coordination.