Renesas 70V27L15PFG8

Overview

70V27L15PFG8 from Integrated Device Technology is a high-speed 3.3V 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address, 15 ns max read cycle time (tRC), 660 µW typical standby power, and industrial temperature support (–40°C to +85°C). It serves as a stand-alone or master/slave-configured memory in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the 70V27L15PFG8 datasheet, 70V27L15PFG8 pinout, 70V27L15PFG8 application, or 70V27L15PFG8 equivalent, key selection considerations include port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S = VIH/VIL, semaphore flag update pulse (tSOP = 10 ns), and LVTTL-compatible 3.3V ±0.3V single-supply operation.

Technical Context

The 70V27L15PFG8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves contention via address-match or chip-enable-triggered BUSY assertion, with priority set-up time tAPS = 5 ns ensuring deterministic resolution.

It supports semaphore signaling across ports using dedicated SEM pins and A0–A2-addressed flags, with tSWRD = 5 ns write-to-read latency and tSPS = 5 ns contention window. The device uses CMOS high-performance fabrication and features separate upper-byte (UB) and lower-byte (LB) enables for flexible bus matching.

Key Specifications

Pinout & Package

70V27L15PFG8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VDD pins require local 3.3 V decoupling; all VSS pins must be connected to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-133AXC and AS7C33128A-15JCIN, the 70V27L15PFG8 uniquely delivers sub-20 ns hardware arbitration, integrated semaphores, and true simultaneous access - making it irreplaceable in deterministic real-time embedded systems where software locks introduce unacceptable jitter or latency.

Availability

70V27L15PFG8 is available at Aetrix Electronics and suitable for industrial PLC communication modules, avionics data concentrators, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V27L15PFG8 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT70V27 family was engineered specifically for deterministic inter-processor communication in real-time embedded systems, emphasizing hardware arbitration, low-latency semaphore signaling, and industrial-grade reliability - not general-purpose memory expansion.

FAQ

What is the maximum operating frequency supported by the 70V27L15PFG8?

The 70V27L15PFG8 supports a maximum read cycle time (tRC) of 15 ns, corresponding to a theoretical maximum sustained access rate of 66.7 MHz per port. This is achievable under specified AC conditions: VDD = 3.3 V ± 0.3 V, TA = –40°C to +85°C, and proper load (30 pF). The device does not use a clock input; its speed is defined by asynchronous timing parameters including tAA, tACE, and tAOE - all rated at ≤15 ns max for the 70V27L15PFG8 variant.

How does the BUSY arbitration mechanism work in the 70V27L15PFG8?

In the 70V27L15PFG8, BUSY arbitration operates in two modes: address-match and chip-enable-triggered. When M/S = VIH (Master), BUSYL/BUSYR are outputs that assert when address or CE conflicts occur; tBAA ≤ 15 ns defines access time from match detection. When M/S = VIL (Slave), BUSY pins become inputs that inhibit writes. Priority is resolved via tAPS = 5 ns setup time - if unsatisfied, arbitration outcome is undefined. The 70V27L15PFG8 implements this entirely in hardware with no software involvement.

Can the 70V27L15PFG8 be used in a single-port configuration?

Yes, the 70V27L15PFG8 can operate as a single-port SRAM by tying one port's CE0/CE1 high and disabling its R/W and OE signals. However, doing so forfeits all dual-port advantages: no simultaneous access, no hardware arbitration, no semaphore signaling, and no BUSY/INT flags from the disabled port. The memory array remains fully accessible through the active port (32K × 16), and standby current drops to ISB4 = 115 mA typ. - but this use case contradicts the device's primary design intent and offers no benefit over lower-cost single-port alternatives.

What is the purpose of the SEM pins on the 70V27L15PFG8?

The SEML and SEMR pins on the 70V27L15PFG8 enable hardware semaphore register access mode. When SEM = VIL and CE = VIH, the device ignores the main memory array and instead maps I/O[0:15] to eight dedicated semaphore flags addressed by A0–A2. This provides atomic, hardware-enforced resource locking between ports: tSOP = 10 ns defines the minimum pulse width to update a flag, and tSWRD = 5 ns is the latency before the updated value appears on all I/O lines - enabling robust inter-processor synchronization without software intervention.

Does the 70V27L15PFG8 support battery backup or data retention in power-loss scenarios?

No, the 70V27L15PFG8 is a volatile static RAM and does not incorporate battery backup circuitry, sleep modes, or non-volatile storage elements. It requires continuous 3.3 V ± 0.3 V supply to retain data. When VDD drops below operational threshold, data is lost within microseconds. For applications requiring data persistence during power loss, external solutions - such as a backup capacitor combined with fast power-fail detection and controlled shutdown - must be implemented. The 70V27L15PFG8's ISB3 = 0.2 mA typ. standby current helps extend hold-up time but does not guarantee retention.