Renesas 70V07S55G

Overview

70V07S55G from IDT (now Renesas) is a high-speed 32K × 8 true dual-port static RAM with independent left/right ports, 55 ns max access time (commercial grade), 3.3 V ±0.3 V single supply, and integrated hardware semaphore and BUSY arbitration logic. It enables simultaneous asynchronous read/write to the same memory location in real-time inter-processor communication systems such as telecom line cards and industrial PLCs.

For engineers reviewing the 70V07S55G datasheet, 70V07S55G pinout, 70V07S55G application, or 70V07S55G equivalent, key selection criteria include dual-port contention handling (BUSY/SEM), interrupt flag support (INTL/INTR), master/slave cascading capability via M/S pin, and low-power standby modes (3.3 mW typ.) - all confirmed for this specific speed-grade and package variant.

Technical Context

The 70V07S55G implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves port-to-port contention using chip enable (CEL/CER) and address match detection - not R/W state - enabling deterministic BUSY assertion within 45 ns (tBAA/tBDA max) for the 55 ns speed grade.

Hardware semaphore functionality uses dedicated A0–A2 address lines to select among eight binary flags, accessed via SEM = VIL and CE = VIH. Interrupt signaling is implemented through fixed mailbox addresses (7FFE_H for INTL, 7FFF_H for INTR), with set/reset timing validated at ≤40 ns (tINS/tINR max) under commercial conditions.

Key Specifications

Pinout & Package

70V07S55G is supplied in an 80-pin thin quad flatpack (TQFP) package per PN80-1 mechanical specification: 14 mm × 14 mm body, 1.4 mm height, 0.5 mm lead pitch. All VCC and GND pins require local decoupling 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 70V07S55G, CY7C028V-55AXC offers identical speed but requires external semaphore management, while 70V25L25PFGI delivers faster timing and lower standby power at the cost of higher active current and industrial qualification - making 70V07S55G optimal for commercial-grade, cost-sensitive dual-CPU coordination where integrated semaphores reduce BOM count.

Availability

70V07S55G is available at Aetrix Electronics and suitable for telecom line card buffering, industrial PLC dual-CPU coordination, and avionics data concentrators requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 70V07S55G 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), now part of Renesas Electronics, is a semiconductor leader specializing in high-performance memory, timing, and interface solutions for communications and industrial markets.

The 70V07S55G belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems where hardware arbitration and resource locking are critical.

FAQ

What is the maximum access time guaranteed for the 70V07S55G?

The 70V07S55G guarantees a maximum access time of 55 ns under commercial temperature conditions (0°C to +70°C) and 3.3 V ±0.3 V supply. This value applies to tAA (address access time), tACE (chip enable access time), and tAOE (output enable access time), as specified in Table 11 of the official datasheet revision DSC 2943/11.

Does the 70V07S55G support hardware semaphore functionality?

Yes, the 70V07S55G integrates eight hardware semaphore flags accessible via A0–A2 address lines when SEM = VIL and CE = VIH. Each flag is a binary token that can be written by one port and read by both, enabling atomic resource locking without software intervention - a confirmed feature documented in Truth Table V and Functional Description section.

How does BUSY arbitration work on the 70V07S55G?

On the 70V07S55G, BUSY arbitration detects simultaneous access to the same memory location by comparing address and chip enable timing between ports. When configured as MASTER (M/S = VIH), BUSYL/BUSYR assert within 45 ns (tBAA max) to stall the later port; as SLAVE (M/S = VIL), BUSY pins serve as write-inhibit inputs - all verified in Truth Table IV and Timing Waveform Figures 14–16.

What is the standby power consumption of the 70V07S55G?

The 70V07S55G consumes 3.3 mW typical standby power (ISB3 mode) when both ports are deselected (CEL = CER = VIH) and inputs are held at CMOS levels. This value is measured at VCC = 3.3 V and TA = +25°C, and is explicitly listed in Table 9 under the "70V07S" column for ISB3 parameter.

Which package type is used for the 70V07S55G?

The 70V07S55G is packaged in an 80-pin thin quad flatpack (TQFP) per PN80-1 mechanical specification: 14 mm × 14 mm body, 1.4 mm height, 0.5 mm lead pitch. Pin configuration details, including VCC/GND distribution and I/O mapping, are shown in Drawing 2943 drw 03 and confirmed in Pin Configurations section page 3.