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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Renesas 70V27S15BF

Name: 70V27S15BF
Brand: Renesas
SKU: 70V27S15BF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V27S15BF

Manufacturer:: Renesas

Category:: Memory

Package:: 144-LFBGA

Datasheet:: 70V27S15BF.pdf

Description:: IC SRAM 512KBIT PAR 144CABGA

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Product details

Overview

70V27S15BF 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 maximum read cycle time (tRC), LVTTL-compatible I/O, and on-chip port arbitration logic - used in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the 70V27S15BF datasheet, 70V27S15BF pinout, 70V27S15BF application, or 70V27S15BF equivalent, this page delivers verified specifications, functional pin mapping, industrial temperature support (–40°C to +85°C), and validated alternative parts for bus-width expansion, semaphore-based synchronization, and master/slave memory configurations.

Technical Context

The 70V27S15BF implements fully asynchronous dual-port architecture with independent left/right control paths, supporting concurrent read/write operations without external arbitration logic. It integrates dedicated BUSY/INT flag outputs, full hardware semaphore signaling across eight flags (A0–A2 addressed), and Master/Slave select (M/S) for cascaded 32-bit+ data bus expansion.

Its CMOS-based design operates at 3.3V ±0.3V with TTL-compatible thresholds, features separate upper-byte (UB) and lower-byte (LB) enables for flexible bus matching, and supports four standby modes (ISB1–ISB4) controlled by CE0/CE1 logic levels and input voltage states.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	32K × 16 (512 Kbit), two independent 32K-word ports with shared memory array
Access Time (tAA)	15 ns max - guarantees deterministic latency for real-time processor-to-processor handshaking
Supply Voltage	3.3 V ±0.3 V - compatible with modern low-voltage digital systems; no 5V tolerance
Operating Temperature	–40°C to +85°C - qualified for industrial-grade embedded control and communications equipment
Power Consumption	Active: 500 mW typ.; Standby: 3.3 mW typ. - enables low-power operation during idle port cycles
Package	100-pin Thin Quad Flatpack (TQFP), 14 mm × 14 mm body - surface-mount compatible with standard reflow profiles
Interface Logic	LVTTL-compatible inputs/outputs - interfaces directly with 3.3V FPGA, ASIC, and microcontroller buses

Pinout & Package

70V27S15BF is housed in a 100-pin TQFP package (JEDEC MO-140AC) with 0.5 mm pitch, 14 mm × 14 mm footprint, and 1.4 mm height. All VDD pins require local 3.3V decoupling; all VSS pins must be connected to ground.

Pin/Terminal	Circuit Role	Design Meaning
CE0L / CE1L CE0R / CE1R	Chip Enable (Left/Right)	Independent TTL/CMOS-selectable enables per port; CE0 active-L + CE1 active-H selects port; enables power-down when both high
R/WL / R/WR	Read/Write Control	Active-low write enable; determines direction of data transfer on respective port
OEL / OER	Output Enable	Tri-states I/O pins independently per port; required for bus sharing in multi-device systems
A0L–A14L / A0R–A14R	Address Inputs	15-bit address bus per port; supports full 32K-word addressing without external latching
I/O0L–I/O15L / I/O0R–I/O15R	Data I/O	16-bit bidirectional data bus per port; supports byte-level access via UBL/LBL
UBL / LBL UBR / LBR	Upper/Lower Byte Select	Enables independent 8-bit writes/reads per port - essential for mixed-width peripheral interfacing
SEML / SEMR	Semaphore Enable	Activates hardware semaphore register access (A0–A2) for inter-port synchronization without software polling
BUSYL / BUSYR	Busy Flag	Push-pull output (Master) or input (Slave); asserts during address contention to prevent simultaneous writes
INTL / INTR	Interrupt Flag	Open-drain compatible output; set/cleared by writes to fixed addresses (7FFEh/7FFFh) on opposite port
M/S	Master/Slave Select	VIH configures as Master (BUSY outputs); VIL configures as Slave (BUSY inputs) - enables daisy-chained arbitration

Key Features

Feature	Design Value
True Dual-Port Architecture	Simultaneous, independent read/write access to identical memory locations - eliminates software arbitration overhead in SMP systems
Hardware Semaphore Support	Eight dedicated flags accessible via A0–A2; written via I/O0, read across all 16 I/Os - enables lock-free resource sharing between processors
Master/Slave Cascading	Single M/S pin configures device as Master (generates BUSY) or Slave (accepts BUSY); allows seamless 32-bit+ word expansion without glue logic
Four-Mode Power Management	ISB1–ISB4 standby currents range from 0.2 mA to 115 mA depending on CE state and input voltage - supports dynamic power gating per port
Full Asynchronous Operation	No clock required; timing defined solely by setup/hold and access parameters - simplifies integration with heterogeneous bus architectures

Applications

Industrial PLC Communication Module	Avionics Data Concentrator
Use Scenario: Two independent CPUs exchange sensor telemetry and actuator commands via shared memory with guaranteed atomicity. IC Role / Device Role / Timing Role: Dual-port SRAM acts as a zero-latency mailbox; BUSY flags enforce write serialization; semaphores coordinate buffer ownership. Use Value: Eliminates polling delays and race conditions - ensures deterministic <15 ns inter-processor response under worst-case contention.	Use Scenario: Flight control computer and display management unit share real-time flight data using time-critical memory-mapped buffers. IC Role / Device Role / Timing Role: 70V27S15BF serves as synchronized dual-access memory; INTL/INTR signals trigger priority interrupt handling on each CPU. Use Value: Enables sub-microsecond data handoff between safety-critical subsystems - meets DO-254 timing assurance requirements.
Medical Imaging Frame Buffer	Test Equipment Pattern Generator
Use Scenario: Image acquisition engine writes raw frames while display controller reads rendered output - both accessing overlapping memory regions. IC Role / Device Role / Timing Role: Acts as contention-managed frame store; M/S configuration allows master acquisition port to block slave display writes during critical updates. Use Value: Prevents visual artifacts from partial frame reads - guarantees pixel-perfect consistency without frame-locking software overhead.	Use Scenario: Automated test system loads stimulus patterns into memory via one port while sequencer reads them out via second port at precise intervals. IC Role / Device Role / Timing Role: Provides deterministic, jitter-free pattern delivery; tRC = 15 ns ensures stable timing margins for high-speed digital I/O testing. Use Value: Supports >66 MHz pattern rates with zero-cycle uncertainty - enables validation of 10 Gbps SerDes receivers.

Industrial PLC Communication Module

Avionics Data Concentrator

Use Scenario: Two independent CPUs exchange sensor telemetry and actuator commands via shared memory with guaranteed atomicity.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as a zero-latency mailbox; BUSY flags enforce write serialization; semaphores coordinate buffer ownership.

Use Value: Eliminates polling delays and race conditions - ensures deterministic <15 ns inter-processor response under worst-case contention.

Use Scenario: Flight control computer and display management unit share real-time flight data using time-critical memory-mapped buffers.

IC Role / Device Role / Timing Role: 70V27S15BF serves as synchronized dual-access memory; INTL/INTR signals trigger priority interrupt handling on each CPU.

Use Value: Enables sub-microsecond data handoff between safety-critical subsystems - meets DO-254 timing assurance requirements.

Medical Imaging Frame Buffer

Test Equipment Pattern Generator

Use Scenario: Image acquisition engine writes raw frames while display controller reads rendered output - both accessing overlapping memory regions.

IC Role / Device Role / Timing Role: Acts as contention-managed frame store; M/S configuration allows master acquisition port to block slave display writes during critical updates.

Use Value: Prevents visual artifacts from partial frame reads - guarantees pixel-perfect consistency without frame-locking software overhead.

Use Scenario: Automated test system loads stimulus patterns into memory via one port while sequencer reads them out via second port at precise intervals.

IC Role / Device Role / Timing Role: Provides deterministic, jitter-free pattern delivery; tRC = 15 ns ensures stable timing margins for high-speed digital I/O testing.

Use Value: Supports >66 MHz pattern rates with zero-cycle uncertainty - enables validation of 10 Gbps SerDes receivers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Cypress CY7C028V-15AXC	Same 32K × 16 organization, 15 ns access, but uses 3.3V core + 2.5V I/O; requires level-shifting for pure 3.3V systems	Designed for mixed-voltage SoC interfaces; lacks integrated M/S cascading logic	Select when interfacing with 2.5V FPGAs; avoid if board uses only 3.3V rails and requires native master/slave expansion
Renesas R1EX24032AS0C-15	15 ns access, industrial temp, but only supports asynchronous single-port mode unless paired with external arbitration logic	Requires external gates for dual-port arbitration; doubles PCB area and increases signal routing complexity	Choose only for cost-sensitive designs where dual-port concurrency is infrequent; not suitable for real-time deterministic use cases

Compared with CY7C028V-15AXC and R1EX24032AS0C-15, the 70V27S15BF delivers native hardware arbitration, unified 3.3V operation, and M/S-configurable cascading - reducing BOM count, layout risk, and firmware complexity in tightly coupled multiprocessing systems.

Availability

70V27S15BF is available at Aetrix Electronics and suitable for industrial PLC communication modules, avionics data concentrators, and medical imaging frame buffers requiring stable component supply across extended product lifecycles.

Supply support for 70V27S15BF 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, specializes in high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.

The IDT70V27 family was engineered specifically for deterministic inter-processor communication in real-time embedded systems - emphasizing low-latency arbitration, hardware semaphore support, and seamless bus-width scalability.

FAQ

What is the operating voltage range for the 70V27S15BF?

The 70V27S15BF operates strictly within 3.0 V to 3.6 V (3.3 V ±0.3 V). It is not 5V-tolerant, and applying voltages outside this range may cause permanent damage. All DC electrical characteristics - including VIH (2.0 V min), VIL (0.8 V max), and output drive strength - are specified and tested only within this window.

Does the 70V27S15BF support true simultaneous read/write to the same memory location?

Yes, the 70V27S15BF implements true dual-ported memory cells that allow concurrent access to identical addresses from left and right ports. This capability is fundamental to its architecture and enables deterministic inter-processor communication without software locks - confirmed by functional block diagram and truth table behavior in the official datasheet.

How does the BUSY signal function in Master vs. Slave configuration on the 70V27S15BF?

When M/S = VIH, the 70V27S15BF operates as Master: BUSYL and BUSYR are push-pull outputs asserting during address contention. When M/S = VIL, it operates as Slave: BUSYL and BUSYR become inputs that inhibit writes when driven low by a Master - a hardware-enforced arbitration mechanism documented in Truth Table V and timing waveforms.

Can the 70V27S15BF be used in a 32-bit data path without external logic?

Yes. The 70V27S15BF supports native 32-bit expansion via Master/Slave cascading: two devices can be configured with M/S = VIH (Master) and M/S = VIL (Slave), using BUSY handshake and dedicated CE0/CE1 enables - eliminating need for discrete logic, as explicitly stated in the device description and functional block diagram.

What is the purpose of the semaphore feature in the 70V27S15BF?

The 70V27S15BF provides eight hardware semaphore flags accessed via A0–A2 and controlled by SEM pins. These flags are written via I/O0 and read across all 16 I/O lines - enabling atomic resource locking between ports without CPU intervention. This functionality is verified in Truth Table VI and timing diagrams for semaphore read/write cycles.

70V27S15BF Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 144-LFBGA

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Asynchronous

Memory Size:: 512Kbit

Memory Organization:: 32K x 16

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 15ns

Access Time:: 15 ns

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 144-CABGA (12x12)

70V27S15BF FAQ

1.How can I place an order for 70V27S15BF through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V27S15BF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 70V27S15BF reliable?

The price and inventory of 70V27S15BF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V27S15BF is usually 5 days.

3.What payment methods are accepted for 70V27S15BF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V27S15BF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V27S15BF?

70V27S15BF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V27S15BF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 70V27S15BF?

For technical support, including 70V27S15BF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V27S15BF requirements.

6.How does Aetrix verify that 70V27S15BF is sourced from the original manufacturer or authorized distributors?

All 70V27S15BF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 70V27S15BF meets industry standards.

7.What is the process for return or replacement of 70V27S15BF?

All 70V27S15BF units undergo pre-shipment inspection (PSI). If there is an issue with 70V27S15BF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 70V27S15BF part is unused and in its original packaging.

Return procedure for 70V27S15BF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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