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

Renesas 70V28L15PFI

Name: 70V28L15PFI
Brand: Renesas
SKU: 70V28L15PFI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V28L15PFI

Manufacturer:: Renesas

Category:: Memory

Package:: 100-LQFP

Datasheet:: 70V28L15PFI.pdf

Description:: IC SRAM 1MBIT PARALLEL 100TQFP

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Product details

Overview

70V28L15PFI from Integrated Device Technology is a high-speed 3.3V 64K × 16 true dual-ported static RAM with independent left/right ports, 15 ns max access time (commercial), LVTTL-compatible I/O, and on-chip semaphore/arbiration logic for multiprocessor synchronization. It operates across –40°C to +85°C and supports master/slave cascading for 32-bit+ bus expansion in real-time control systems.

For engineers reviewing the 70V28L15PFI datasheet, 70V28L15PFI pinout, 70V28L15PFI application, or 70V28L15PFI equivalent, key selection criteria include simultaneous port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S = VIH/VIL configuration, dual CE-controlled power-down modes (ISB3 = 0.2 mA typ.), and semaphore write-to-read latency (tSWRD = 5 ns).

Technical Context

The 70V28L15PFI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling concurrent read/write to any memory location without internal contention. Its hardware arbitration uses push-pull BUSY outputs (not open-drain) and supports both master-mode (BUSY as output) and slave-mode (BUSY as input) via the M/S pin.

On-chip semaphore logic provides eight dedicated binary flags accessed via A0–A2 and controlled by SEM/CE polarity (CE = VIH, SEM = VIL), with deterministic token-passing behavior confirmed in Truth Table VI. Interrupt signaling is implemented through dedicated mailbox addresses FFFE_H (INTL set) and FFFF_H (INTR set), requiring no external logic for inter-processor notification.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	64K × 16 (1,048,576 bits), true dual-port SRAM with independent left/right access paths
Access Time (tAA)	15 ns max (commercial grade), enabling 66.7 MHz sustained random access per port
Supply Voltage	3.3 V ± 0.3 V - single LVTTL-compatible rail; all VCC pins must be connected
Operating Temperature	–40°C to +85°C (industrial grade), validated per Absolute Maximum Ratings table
Standby Current (ISB3)	0.2 mA typ. - full CMOS standby mode with both ports disabled (CE > VCC−0.2 V)
Bus Interface	Separate UBL/LBL and UBR/LBR controls enable byte-level writes compatible with multiplexed 16-bit data buses
Semaphore Latency	tSWRD = 5 ns - minimum delay from semaphore write to valid read across ports

Pinout & Package

70V28L15PFI is housed in a 100-pin Thin Quad Flatpack (TQFP) with 14 mm × 14 mm body and 1.4 mm height. Pin 1 is located at top-left corner (see Pin Configurations diagram, page 2). All VCC and GND pins must be connected per Notes 1–2 in datasheet.

Pin/Terminal	Circuit Role	Design Meaning
CE0L / CE1L	Left-port chip enables	Dual CE inputs allow depth expansion without external logic; TTL/CMOS active-low selection
R/WL / R/WR	Read/write direction control	Active-low signal determines data flow direction per port; required for non-contention timing
SEML / SEMR	Semaphore enable	Low-active control for accessing 8 semaphore latches (A0–A2); requires CE = VIH
BUSYL / BUSYR	Port arbitration status	Push-pull outputs (master) or inputs (slave); assert when same-address access detected
M/S	Master/slave mode select	VIH = BUSY output (master), VIL = BUSY input (slave); configures arbitration behavior
INTL / INTR	Interrupt flag outputs	Non-tri-state totem-pole outputs; set/cleared via FFFE_H/FFFF_H mailbox writes
I/O0L–I/O15L / I/O0R–I/O15R	Data I/O banks	Two independent 16-bit bidirectional data buses; UBL/LBL and UBR/LBR enable byte masking

Key Features

Feature	Design Value
True dual-port memory cells	Enables simultaneous, independent read/write to identical addresses - no internal arbitration delay
Hardware semaphore support	Eight dedicated latches accessible via A0–A2; eliminates software polling for resource locking
Configurable BUSY logic	M/S pin selects between master (push-pull BUSY output) and slave (BUSY input write-inhibit) modes
Depth-expansion capability	Dual CE0/CE1 per port allows seamless stacking of multiple devices without external decode logic
Low-power standby	ISB3 = 0.2 mA typ. in full CMOS standby - critical for battery-backed or thermally constrained systems

Applications

Industrial Motion Control	Avionics Data Concentrators
Use Scenario: Real-time coordination between motion controller CPU and FPGA-based servo driver using shared memory buffers. IC Role / Device Role / Timing Role: Dual-port RAM acts as zero-latency message exchange hub; BUSY arbitration prevents concurrent write collisions during trajectory updates. Use Value: Eliminates software handshaking overhead; tBDD ≤ 15 ns ensures deterministic response to position command changes.	Use Scenario: High-integrity sensor fusion system where flight computer and backup processor share telemetry buffers with guaranteed atomic access. IC Role / Device Role / Timing Role: 70V28L15PFI serves as fault-tolerant shared memory with semaphore-controlled resource allocation between redundant channels. Use Value: tSWRD = 5 ns semaphore update enables sub-microsecond token passing - meeting DO-254 timing assurance requirements.
Medical Imaging Subsystems	Test & Measurement Equipment
Use Scenario: MRI scanner front-end where acquisition FPGA streams raw k-space data into memory while host CPU performs reconstruction. IC Role / Device Role / Timing Role: Left port handles DMA writes from ADC/FPGA; right port enables CPU reads with no wait states or bus contention. Use Value: 15 ns tAA and independent port timing sustain >60 MB/s sustained throughput - matching 12-bit, 50 MSPS ADC output rates.	Use Scenario: Automated test equipment synchronizing pattern generator and digitizer via shared trigger/status registers. IC Role / Device Role / Timing Role: 70V28L15PFI provides deterministic interlock signaling using INTL/INTR flags and FFFE_H/FFFF_H mailboxes. Use Value: tINS/tINR ≤ 20 ns interrupt assertion/reset guarantees sub-25 ns trigger latency - essential for <100 ns jitter budgets.

Industrial Motion Control

Avionics Data Concentrators

Use Scenario: Real-time coordination between motion controller CPU and FPGA-based servo driver using shared memory buffers.

IC Role / Device Role / Timing Role: Dual-port RAM acts as zero-latency message exchange hub; BUSY arbitration prevents concurrent write collisions during trajectory updates.

Use Value: Eliminates software handshaking overhead; tBDD ≤ 15 ns ensures deterministic response to position command changes.

Use Scenario: High-integrity sensor fusion system where flight computer and backup processor share telemetry buffers with guaranteed atomic access.

IC Role / Device Role / Timing Role: 70V28L15PFI serves as fault-tolerant shared memory with semaphore-controlled resource allocation between redundant channels.

Use Value: tSWRD = 5 ns semaphore update enables sub-microsecond token passing - meeting DO-254 timing assurance requirements.

Medical Imaging Subsystems

Test & Measurement Equipment

Use Scenario: MRI scanner front-end where acquisition FPGA streams raw k-space data into memory while host CPU performs reconstruction.

IC Role / Device Role / Timing Role: Left port handles DMA writes from ADC/FPGA; right port enables CPU reads with no wait states or bus contention.

Use Value: 15 ns tAA and independent port timing sustain >60 MB/s sustained throughput - matching 12-bit, 50 MSPS ADC output rates.

Use Scenario: Automated test equipment synchronizing pattern generator and digitizer via shared trigger/status registers.

IC Role / Device Role / Timing Role: 70V28L15PFI provides deterministic interlock signaling using INTL/INTR flags and FFFE_H/FFFF_H mailboxes.

Use Value: tINS/tINR ≤ 20 ns interrupt assertion/reset guarantees sub-25 ns trigger latency - essential for <100 ns jitter budgets.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C1370D-133AXC	133 MHz QDR interface; 32-bit burst mode; 1.8 V core / 3.3 V I/O; no built-in semaphore logic	Requires external arbitration logic for multiprocessor sync; optimized for streaming over random access	Select when bandwidth >1 GB/s needed and software-managed semaphores are acceptable
AS7C331024B-15TIN	Single-port 1M × 32 SRAM; 15 ns access; 3.3 V only; no dual-port or arbitration features	No hardware coherency support; requires external bus switches or FPGA logic for multi-CPU sharing	Select only for cost-sensitive, non-concurrent-access applications where dual-port functionality is unnecessary

Compared with CY7C1370D-133AXC and AS7C331024B-15TIN, the 70V28L15PFI uniquely delivers deterministic hardware arbitration (tAPS = 5 ns), integrated semaphores, and true simultaneous port operation - making it irreplaceable in hard real-time embedded systems where software-managed synchronization introduces unacceptable jitter or latency.

Availability

70V28L15PFI is available at Aetrix Electronics and suitable for industrial motion control, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V28L15PFI 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 70V28L15PFI belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems with strict timing constraints.

FAQ

What is the operating temperature range certified for the 70V28L15PFI?

The 70V28L15PFI is rated for industrial operation from –40°C to +85°C, as confirmed in the Recommended DC Operating Conditions table (page 3) and Absolute Maximum Ratings (page 3). This range applies to all speed grades of the 70V28L family, including the 15 ns variant. The device meets these specifications under 3.3 V ± 0.3 V supply conditions and has been characterized across this full thermal envelope.

How does the M/S pin affect BUSY functionality in the 70V28L15PFI?

When M/S = VIH, the 70V28L15PFI operates in master mode: BUSYL and BUSYR become push-pull outputs that assert low when address contention occurs. When M/S = VIL, it operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes when driven low. This dual-mode behavior is explicitly defined in Note 1 of the Functional Block Diagram and Truth Table V.

Can the 70V28L15PFI support 32-bit data bus expansion, and how is it implemented?

Yes - the 70V28L15PFI supports 32-bit expansion via its MASTER/SLAVE cascading architecture. One device is configured as master (M/S = VIH) and others as slaves (M/S = VIL); BUSY signals are externally ANDed, and CE0/CE1 enable depth expansion without additional logic. This method is documented in the Description section (page 2) and enables full-speed error-free operation in wide-bus systems.

What are the valid address locations for interrupt flag control in the 70V28L15PFI?

The 70V28L15PFI uses fixed mailbox addresses for interrupt control: writing to FFFE_H sets the left-port INTL flag, and writing to FFFF_H sets the right-port INTR flag. Clearing is performed by reading those same addresses. This behavior is unambiguously specified in Truth Table IV (page 13) and the Functional Description (page 14), and applies regardless of operating temperature or voltage.

Is external pull-up resistance required on BUSY pins for the 70V28L15PFI?

No - the BUSY outputs on the 70V28L15PFI are push-pull (totem-pole), not open-drain, as stated in Note 2 of the Features section (page 1) and confirmed in the Functional Description (page 15). Pull-up resistors are unnecessary in master mode; in slave mode, BUSY pins serve as inputs and must be driven externally - no termination is specified in the datasheet.

70V28L15PFI Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 100-LQFP

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Asynchronous

Memory Size:: 1Mbit

Memory Organization:: 64K x 16

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 15ns

Access Time:: 15 ns

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 100-TQFP (14x14)

70V28L15PFI FAQ

1.How can I place an order for 70V28L15PFI through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V28L15PFI 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 70V28L15PFI reliable?

The price and inventory of 70V28L15PFI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V28L15PFI is usually 5 days.

3.What payment methods are accepted for 70V28L15PFI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V28L15PFI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V28L15PFI?

70V28L15PFI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V28L15PFI 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 70V28L15PFI?

For technical support, including 70V28L15PFI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V28L15PFI requirements.

6.How does Aetrix verify that 70V28L15PFI is sourced from the original manufacturer or authorized distributors?

All 70V28L15PFI 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 70V28L15PFI meets industry standards.

7.What is the process for return or replacement of 70V28L15PFI?

All 70V28L15PFI units undergo pre-shipment inspection (PSI). If there is an issue with 70V28L15PFI, 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 70V28L15PFI part is unused and in its original packaging.

Return procedure for 70V28L15PFI:

1.Submit a request within 90 days.

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

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