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

Renesas 70V28L20PF

Name: 70V28L20PF
Brand: Renesas
SKU: 70V28L20PF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V28L20PF

Manufacturer:: Renesas

Category:: Memory

Package:: 100-LQFP

Datasheet:: 70V28L20PF.pdf

Description:: IC SRAM 1MBIT PARALLEL 100TQFP

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Product details

Overview

70V28L20PF from Integrated Device Technology is a high-speed 3.3V 64K × 16 true dual-ported static RAM with independent left/right ports, 20 ns max access time (industrial & commercial), LVTTL-compatible I/O, and on-chip semaphore/arbiration logic for multiprocessor synchronization. It enables simultaneous read/write to the same memory location in systems requiring deterministic inter-processor communication.

For engineers reviewing the 70V28L20PF datasheet, 70V28L20PF pinout, 70V28L20PF application, or 70V28L20PF equivalent, key selection criteria include BUSY arbitration timing (tBAA ≤ 20 ns), dual CE support for depth expansion, M/S-configurable master/slave operation, and integrated 8-bit semaphore flags accessible via A0–A2.

Technical Context

The 70V28L20PF implements fully asynchronous dual-port architecture with separate address, control, and data buses per port-no shared timing constraints between left and right sides. Its hardware arbitration uses push-pull BUSY outputs (not open-drain) and supports both address-match and chip-enable-triggered contention detection.

On-chip semaphore logic operates independently of the main memory array, using dedicated latches addressed by A0–A2 and controlled by SEM pins; interrupt flags (INTL/INTR) are set/cleared via fixed addresses FFFE_H (left) and FFFF_H (right), with no internal state retention across power cycles.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	64K × 16 bits (1024 Kbit total); supports true concurrent access to identical addresses from both ports
Access Time (max)	20 ns - guarantees worst-case read latency under industrial conditions (–40°C to +85°C) at 3.3V ±0.3V
Supply Voltage	3.0 V to 3.6 V - LVTTL-compatible single-supply operation; all VCC pins must be connected
Standby Current (ISB3)	0.2 mA typ. - full CMOS standby mode enabled when both CE inputs > VCC−0.2V or < 0.2V
Bus Width Control	Separate UBL/LBL and UBR/LBR - enables byte-level write masking for 8-bit sub-accesses without external logic
Arbitration Mode	M/S pin selects master (BUSY output, push-pull) or slave (BUSY input, write-inhibit) behavior - no external pull-ups required in master mode
Semaphore Capacity	8 independent binary flags - written via I/O0, readable on all 16 I/O lines; accessed using A0–A2 with SEM = VIL

Pinout & Package

70V28L20PF is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch; package body measures 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be connected per datasheet Note 1–2.

Pin/Terminal	Circuit Role	Design Meaning
CE0L, CE1L / CE0R, CE1R	Dual chip enable inputs per port	Enable depth expansion without external logic; either CE active selects port - TTL- or CMOS-level compatible
R/WL, R/WR	Read/write direction control	Active-low; determines data flow direction during CE-enabled cycles - no bus turnaround delay required
OEL, OER	Output enable per port	Tri-states I/O drivers independently; allows one port to drive while other reads/writes without contention
SEML, SEMR	Semaphore enable	Low-active; switches port operation between RAM array (SEM = VIH) and semaphore register (SEM = VIL)
BUSYL, BUSYR	Arbitration status flag	Push-pull output (master) or input (slave); asserts when opposing port accesses same address - gates writes internally if low
INTL, INTR	Interrupt flag output	Open-collector compatible (per datasheet Note 2); asserted when opposite port writes to FFFE_H (INTL) or FFFF_H (INTR)
UBL, LBL / UBR, LBR	Upper/lower byte select	Independent 8-bit masking - enables mixed-width transactions (e.g., 8-bit peripheral + 16-bit CPU on same bus)
A0L–A15L / A0R–A15R	Address inputs	Fully independent 16-bit addressing per port; no shared address lines - eliminates inter-port timing skew
I/O0L–I/O15L / I/O0R–I/O15R	Bidirectional data I/O	16-bit parallel interface per port; supports simultaneous read/write with automatic conflict resolution via BUSY
M/S	Master/slave configuration	VIH = master (BUSY outputs); VIL = slave (BUSY inputs); determines arbitration role in cascaded systems

Key Features

Feature	Design Value
True dual-port memory cells	Enables deterministic, cycle-accurate simultaneous access to identical memory locations - no arbitration wait states incurred
Hardware semaphore logic	Eight dedicated binary flags accessible via A0–A2; eliminates software-only spinlocks and reduces inter-processor latency by >50% in token-passing protocols
Configurable BUSY arbitration	M/S pin selects master (push-pull BUSY output) or slave (BUSY input) mode - supports scalable multi-device arrays without external logic
Byte-selectable write control	UBL/LBL and UBR/LBR allow independent 8-bit writes per port - avoids read-modify-write cycles for partial updates
Automatic power-down	CE-driven standby draws only 0.2 mA typ. (ISB3); enables dynamic power gating in burst-mode embedded systems
Industrial temperature range	Rated for –40°C to +85°C operation - qualified for use in motor drives, industrial PLCs, and outdoor communications equipment

Applications

Real-Time Motion Control	Multi-Core DSP Co-Processing
Use Scenario: Two synchronized motion controllers share position/velocity data in closed-loop servo systems with <1 µs jitter tolerance. IC Role / Device Role / Timing Role: 70V28L20PF acts as deterministic shared memory buffer with hardware semaphore coordination - eliminates race conditions during trajectory update handoffs. Use Value: Enables sub-microsecond inter-controller synchronization without software overhead; BUSY arbitration ensures zero-data-loss writes during simultaneous access.	Use Scenario: Dual SHARC or C6000 DSPs exchange FFT coefficients and filter taps in real-time audio processing pipelines. IC Role / Device Role / Timing Role: 70V28L20PF serves as low-latency, non-blocking memory bridge - left port handles DMA from ADC, right port feeds FIR engine. Use Value: 20 ns access time sustains 50+ MB/s sustained throughput; independent byte enables allow asymmetric data packing (e.g., 24-bit audio samples into 16-bit bus).
Redundant Safety PLC Memory	High-Speed Test Equipment Data Buffer
Use Scenario: Primary and backup safety controllers maintain mirrored process state in SIL-3-certified programmable logic controllers. IC Role / Device Role / Timing Role: 70V28L20PF provides fault-tolerant dual-port storage where each controller owns one port - semaphores coordinate safe state transitions. Use Value: Hardware-enforced mutual exclusion prevents conflicting writes; M/S configuration allows primary to act as master with BUSY-driven failover signaling.	Use Scenario: Automated test equipment captures high-speed digital patterns (≥100 MHz) and streams to host PC via PCIe - requires burst buffering with minimal latency. IC Role / Device Role / Timing Role: 70V28L20PF functions as ping-pong buffer: left port accepts pattern generator output, right port feeds PCIe DMA engine. Use Value: Simultaneous read/write capability eliminates pipeline stalls; 100-pin TQFP supports dense PCB layout with matched trace lengths for signal integrity.

Real-Time Motion Control

Multi-Core DSP Co-Processing

Use Scenario: Two synchronized motion controllers share position/velocity data in closed-loop servo systems with <1 µs jitter tolerance.

IC Role / Device Role / Timing Role: 70V28L20PF acts as deterministic shared memory buffer with hardware semaphore coordination - eliminates race conditions during trajectory update handoffs.

Use Value: Enables sub-microsecond inter-controller synchronization without software overhead; BUSY arbitration ensures zero-data-loss writes during simultaneous access.

Use Scenario: Dual SHARC or C6000 DSPs exchange FFT coefficients and filter taps in real-time audio processing pipelines.

IC Role / Device Role / Timing Role: 70V28L20PF serves as low-latency, non-blocking memory bridge - left port handles DMA from ADC, right port feeds FIR engine.

Use Value: 20 ns access time sustains 50+ MB/s sustained throughput; independent byte enables allow asymmetric data packing (e.g., 24-bit audio samples into 16-bit bus).

Redundant Safety PLC Memory

High-Speed Test Equipment Data Buffer

Use Scenario: Primary and backup safety controllers maintain mirrored process state in SIL-3-certified programmable logic controllers.

IC Role / Device Role / Timing Role: 70V28L20PF provides fault-tolerant dual-port storage where each controller owns one port - semaphores coordinate safe state transitions.

Use Value: Hardware-enforced mutual exclusion prevents conflicting writes; M/S configuration allows primary to act as master with BUSY-driven failover signaling.

Use Scenario: Automated test equipment captures high-speed digital patterns (≥100 MHz) and streams to host PC via PCIe - requires burst buffering with minimal latency.

IC Role / Device Role / Timing Role: 70V28L20PF functions as ping-pong buffer: left port accepts pattern generator output, right port feeds PCIe DMA engine.

Use Value: Simultaneous read/write capability eliminates pipeline stalls; 100-pin TQFP supports dense PCB layout with matched trace lengths for signal integrity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C028V-20AXC	20 ns access, 64K×16, but uses 3.3V core + 2.5V I/O; no integrated semaphore logic; 100-pin TQFP	Lacks hardware semaphore and BUSY arbitration - requires external logic or software protocols for multiprocessor sync	Choose when cost sensitivity outweighs need for deterministic inter-processor coordination
AS7C364000B-20TIN	20 ns access, 64K×16, 3.3V only, but no dual-port arbitration logic; 100-pin TQFP; lower standby current (100 µA)	No BUSY, SEM, INT, or M/S pins - purely asynchronous dual-port with no conflict resolution features	Choose for simpler dual-CPU systems where software-managed locking is acceptable

Compared with CY7C028V-20AXC and AS7C364000B-20TIN, the 70V28L20PF uniquely integrates hardware semaphore, configurable BUSY arbitration, and interrupt flag generation - delivering deterministic, zero-software-overhead synchronization essential for hard real-time control.

Availability

70V28L20PF is available at Aetrix Electronics and suitable for real-time motion control, redundant safety PLCs, multi-core DSP co-processing, and high-speed test equipment requiring stable component supply across extended product lifecycles.

Supply support for 70V28L20PF 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 70V28L20PF belongs to IDT's legacy high-speed dual-port SRAM family, engineered specifically for deterministic inter-processor communication in real-time embedded systems requiring hardware-enforced resource sharing.

FAQ

What is the maximum operating temperature range supported by the 70V28L20PF?

The 70V28L20PF is rated for industrial temperature operation from –40°C to +85°C. This specification is explicitly confirmed in the "Features" section and "Recommended DC Operating Conditions" table of the official datasheet (DSC-4849/8, June 2019), and applies to both commercial and industrial speed grades of the 70V28L20PF device.

How does the M/S pin affect BUSY pin functionality in the 70V28L20PF?

When M/S = VIH, the 70V28L20PF operates as a master: BUSYL and BUSYR become push-pull outputs that assert low during address-contention events. When M/S = VIL, it operates as a slave: BUSYL and BUSYR become inputs that must be held high for normal operation or pulled low to inhibit writes - no external pull-up resistors needed in master mode.

Can the 70V28L20PF perform simultaneous read and write operations on the same memory address?

Yes - the 70V28L20PF supports true simultaneous access to the same memory location. If both ports attempt a read/write to the same address, the BUSY logic asserts to stall the later access, while the earlier access proceeds. This behavior is guaranteed by the on-chip arbitration logic and documented in the "Busy Logic" section and timing waveforms (e.g., Figure 11).

What are the valid address ranges for interrupt flag control in the 70V28L20PF?

The 70V28L20PF uses fixed addresses for interrupt control: writing to FFFE_H (hex) with the right port sets the left-port interrupt flag (INTL), and reading FFFE_H with the left port clears it. Writing to FFFF_H with the left port sets the right-port flag (INTR), and reading FFFF_H with the right port clears it - as defined in Truth Table IV.

Does the 70V28L20PF require external pull-up resistors on its BUSY or INT pins?

No - the 70V28L20PF's BUSY pins (BUSYL/BUSYR) are push-pull outputs in master mode and do not require external pull-ups. The INT pins (INTL/INTR) are specified as non-tri-state totem-pole outputs per Note 2 in the "Features" section, confirming they drive actively high/low without external biasing components.

70V28L20PF 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:: 20ns

Access Time:: 20 ns

Voltage - Supply:: 3V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

70V28L20PF FAQ

1.How can I place an order for 70V28L20PF through Aetrix?

Please submit a Request for Quotation (RFQ) for 70V28L20PF 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 70V28L20PF reliable?

The price and inventory of 70V28L20PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V28L20PF is usually 5 days.

3.What payment methods are accepted for 70V28L20PF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V28L20PF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 70V28L20PF?

70V28L20PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 70V28L20PF 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 70V28L20PF?

For technical support, including 70V28L20PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V28L20PF requirements.

6.How does Aetrix verify that 70V28L20PF is sourced from the original manufacturer or authorized distributors?

All 70V28L20PF 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 70V28L20PF meets industry standards.

7.What is the process for return or replacement of 70V28L20PF?

All 70V28L20PF units undergo pre-shipment inspection (PSI). If there is an issue with 70V28L20PF, 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 70V28L20PF part is unused and in its original packaging.

Return procedure for 70V28L20PF:

1.Submit a request within 90 days.

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

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