Renesas 71342SA55JI

Overview

IDT71342SA55JI from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 55 ns max read cycle time, supporting independent asynchronous access from left and right ports, and featuring TTL-compatible 5V ±10% supply - used in real-time interprocessor communication systems requiring concurrent memory access and hardware arbitration.

For engineers reviewing the IDT71342SA55JI datasheet, IDT71342SA55JI pinout, IDT71342SA55JI application, or IDT71342SA55JI equivalent, this page delivers verified timing specs (tRC = 55 ns), power behavior (ISB3 = 1.0 mA typ.), semiconductor-grade industrial temperature support (–40°C to +85°C), and confirmed PLCC-52 package mapping - all extracted from official IDT documentation.

Technical Context

The IDT71342SA55JI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses for left and right ports, enabling simultaneous read/write operations without bus contention except at non-semaphore locations. Its dedicated 3-bit address space (A0–A2) accesses eight independent semaphore latches, each active-low and write-locked per port upon zero-write.

Semaphore arbitration uses hardware flag latching with automatic resolution of simultaneous requests: only one port receives the token, with deterministic assignment when timing skew exists and arbitrary but guaranteed single-winner resolution under true simultaneity. Power-down is controlled independently per port via CE and SEM pins, enabling CMOS-level standby (ISB3) as low as 0.2 mA typ. for the LA variant - though IDT71342SA55JI is SA-grade with 1.0 mA ISB3 typical.

Key Specifications

Pinout & Package

Package: 52-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 0.79 in × 0.79 in × 0.17 in (20.1 mm × 20.1 mm × 4.3 mm), lead pitch 0.05 in (1.27 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1342BV33-55AXI, IDT71342SA55JI avoids level-shifter BOM cost and layout complexity in 5V environments; versus IDT71342LA55JI, it trades data retention capability for lower unit price and identical 55 ns performance - making it the preferred choice for industrial controllers with stable power.

Availability

IDT71342SA55JI is available at Aetrix Electronics and suitable for real-time interprocessor communication, digital signal co-processing, redundant control system arbitration, and high-speed test equipment data capture requiring stable component supply across extended production lifecycles.

Supply support for IDT71342SA55JI 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs for high-performance computing and communications infrastructure.

IDT71342SA55JI belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor memory sharing in aerospace, industrial automation, and telecom systems where hardware semaphore arbitration replaces software mutexes.

FAQ

What is the maximum operating temperature range for IDT71342SA55JI?

IDT71342SA55JI is rated for industrial temperature operation from –40°C to +85°C. This specification is production-tested per IDT DSC2621/16, and applies to all DC and AC electrical parameters including tRC = 55 ns max, ISB3 = 1.0 mA typical, and VIH/VIL thresholds. The device uses CMOS process technology qualified for continuous operation across this full range without derating.

Does IDT71342SA55JI support battery backup data retention?

No, IDT71342SA55JI does not support battery backup data retention. That feature is exclusive to the LA variant (e.g., IDT71342LA55JI), which specifies VDR = 2.0 V min and ICCDR = 100 µA typical at 2V. The SA suffix in IDT71342SA55JI denotes standard power grade with no data retention capability below 4.5 V - confirmed in IDT DSC2621/16 Table 7 and Functional Description section.

Which package type is used for IDT71342SA55JI?

IDT71342SA55JI is packaged in a 52-pin Plastic Leaded Chip Carrier (PLCC), designated PLG52 per IDT documentation. Pin configuration matches Figure 2721 drw 02a, with dimensions approximately 0.79 in × 0.79 in × 0.17 in. It is not offered in the 64-pin TQFP (PNG64) variant - that package is reserved for LA-grade parts and certain speed grades not applicable to IDT71342SA55JI.

How many semaphore flags does IDT71342SA55JI provide, and how are they accessed?

IDT71342SA55JI provides eight independent hardware semaphore flags, accessed exclusively via A0–A2 address lines when SEM is asserted (SEML or SEMR = LOW). Each flag occupies a unique 3-bit address; only I/O0 is used for writing, and all eight I/O lines reflect the flag state (all 0s or all 1s) on read. This architecture is detailed in Truth Table II and Functional Description sections of IDT DSC2621/16.

Is IDT71342SA55JI pin-compatible with other members of the IDT71342 family?

IDT71342SA55JI shares identical pinout with all PLCC-52 variants in the IDT71342 family, including IDT71342LA55JI and IDT71342SA45JI. Differences are limited to speed grade (tRC), power grade (SA vs LA), and temperature screening - not pin assignment or electrical interface. However, it is not pin-compatible with the 64-pin TQFP versions (e.g., IDT71342LA55JGI), which have different pin counts and signal allocations.