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Renesas 71V321SA55PF8
- Part No.:
- 71V321SA55PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321SA55PF8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,274
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Product details
Overview
71V321SA55PF8 from Renesas Electronics is a high-speed 3.3V 2K × 8 dual-port static RAM with independent left/right ports, on-chip interrupt logic (INTL/INTR), BUSY arbitration flag, and 55 ns max read/write cycle time. It operates across commercial temperature range (0°C to +70°C), supports TTL-compatible I/O, and delivers 325 mW typical active power consumption. Used in real-time interprocessor communication systems requiring concurrent memory access.
For engineers reviewing the 71V321SA55PF8 datasheet, 71V321SA55PF8 pinout, 71V321SA55PF8 application, or 71V321SA55PF8 equivalent, this page provides verified technical context, package mapping, functional timing behavior, and validated alternative options for dual-port SRAM selection in embedded control and data coherency architectures.
Technical Context
The 71V321SA55PF8 implements fully asynchronous dual-port operation with separate address, control, and bidirectional I/O buses per port. Its internal arbitration logic uses address and chip-enable matching (not R/W state) to assert BUSYL/BUSYR outputs, enabling hardware-based contention resolution without external logic.
Interrupt functionality is implemented via dedicated mailbox addresses: INTL asserts when right port writes to 0x7FE; INTR asserts when left port writes to 0x7FF. Both flags are cleared by reading the same address with OE and CE asserted - no dedicated control register or command sequence required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit data width), providing 16,384 total bits of fast-access SRAM |
| Access Time | 55 ns maximum read/write cycle time - defines minimum clock period for synchronous interface designs |
| Supply Voltage | 3.3 V ± 0.3 V - requires single low-noise rail; not compatible with 5 V or 2.5 V systems |
| Operating Temperature | 0°C to +70°C (Commercial grade) - excludes industrial-grade thermal margin and qualification |
| Active Current | 55 mA typical (both ports active) - enables accurate power budgeting for multi-port memory subsystems |
| Standby Current | 1.0 mA typical full standby (ISB3) - achieved when both CE inputs > VCC − 0.2 V and all inputs at CMOS levels |
| I/O Interface | TTL-compatible voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max) - ensures interoperability with legacy 3.3 V logic families |
Pinout & Package
71V321SA55PF8 is packaged in a 64-pin TQFP (Thin Quad Flat Pack), code PNG64, body size 10 mm × 10 mm × 1.4 mm. All VCC and GND pins must be individually decoupled per manufacturer layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus selecting one of 2048 locations for left-side access |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus enabling concurrent right-side memory access |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; direction controlled by R/WL and OEL; high-impedance when deselected |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; direction controlled by R/WR and OER; electrically isolated from left port I/O |
| CEL, CER | Chip enable inputs | Active-low enables respective port; deassertion places port into low-power standby (ISB1–ISB4) |
| OEL, OER | Output enable inputs | Active-low controls output drivers; used with R/W to define read/write direction and tri-state behavior |
| R/WL, R/WR | Read/write control | Active-low write enable; high = read mode; determines data flow direction on I/O bus |
| BUSYL, BUSYR | Arbitration status outputs | Totem-pole outputs indicating port-level contention; asserted low when opposite port accesses same address |
| INTL, INTR | Interrupt flag outputs | Open-drain capable (per datasheet note); indicate mailbox writes to 0x7FE (left) or 0x7FF (right) |
| VCC, GND | Power supply terminals | Multiple VCC/GND pairs require local 0.1 µF ceramic decoupling; no shared ground plane assumption |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration logic | Hardware-based BUSY assertion using address + CE match only - eliminates need for external priority encoder or glue logic |
| Interprocessor interrupt mailbox | User-defined 8-bit message storage at fixed addresses (0x7FE/0x7FF) with automatic flag generation and clear-on-read behavior |
| Asynchronous port independence | Full read/write capability on either port at any time - no synchronization overhead or clock domain crossing required |
| Low-power standby modes | Four distinct standby current states (ISB1–ISB4) selectable via CE and input voltage levels - supports fine-grained power gating |
| TQFP packaging | 64-pin thin quad flat pack (PNG64) with 0.5 mm pitch - suitable for automated SMT assembly and moderate I/O density layouts |
Applications
| Real-Time Interprocessor Communication | Redundant Control System Memory |
|---|---|
Use Scenario: Two microcontrollers exchange status and command data through shared memory without software polling or OS intervention. IC Role / Device Role / Timing Role: Dual-port SRAM acts as hardware-synchronized mailbox; BUSY signals stall conflicting writes; INTL/INTR trigger CPU interrupts. Use Value: Eliminates race conditions during concurrent access; reduces inter-CPU latency to ≤55 ns; removes need for semaphore software overhead. | Use Scenario: Primary and backup controllers maintain identical state copies in mirrored memory banks for failover readiness. IC Role / Device Role / Timing Role: Left port serves primary controller; right port serves backup; arbitration ensures atomic updates during switchover sequences. Use Value: Enables sub-microsecond state synchronization; guarantees memory coherency without external arbitration logic or FPGA resources. |
| Video Frame Buffer Sharing | DSP + MCU Co-Processing Interface |
Use Scenario: Video processor writes rendered frames while display controller reads previous frame - simultaneous access required. IC Role / Device Role / Timing Role: Acts as ping-pong buffer; left port connects to video engine; right port connects to display timing controller. Use Value: Supports continuous 60 Hz video streaming with zero-frame-drop guarantee; eliminates FIFO depth estimation and overflow handling. | Use Scenario: DSP performs signal processing while MCU handles user interface and system management - shared results buffer needed. IC Role / Device Role / Timing Role: Provides deterministic, low-latency data handoff between heterogeneous processors; interrupt flags notify completion. Use Value: Reduces inter-processor handshaking time from milliseconds (UART) to nanoseconds; enables pipelined execution across domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C024AV-55AXC | 55 ns access, 2K × 16 organization, 3.3 V supply, but lacks integrated BUSY arbitration logic | Requires external logic for contention detection; wider data bus suits 16-bit systems but increases pin count | Choose when 16-bit data path is required and external arbitration is acceptable |
| AS7C3256A-55JCIN | 55 ns access, 32K × 8 organization, 3.3 V supply, no interrupt or BUSY features | Higher density but no hardware interprocessor signaling; suited for simple shared memory, not real-time coherency | Choose when larger memory capacity is critical and software-managed synchronization suffices |
Compared with CY7C024AV-55AXC and AS7C3256A-55JCIN, the 71V321SA55PF8 uniquely integrates hardware arbitration and interrupt mailbox logic - reducing BOM count, PCB area, and firmware complexity in tightly coupled dual-processor systems.
Availability
71V321SA55PF8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, redundant control systems, video frame buffering, and DSP-MCU co-processing applications requiring stable component supply and long-term lifecycle support.
Supply support for 71V321SA55PF8 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
Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.
The 71V321SA55PF8 belongs to Renesas' legacy dual-port SRAM product line, designed specifically for deterministic, low-latency memory sharing between independent processors in safety-critical and real-time embedded systems.
FAQ
What is the exact memory capacity and organization of the 71V321SA55PF8?
The 71V321SA55PF8 provides 2K × 8 bits of static RAM - 2048 addressable words, each 8 bits wide, totaling 16,384 bits. This organization supports byte-aligned access from both ports independently, with no internal banking or interleaving. The 71V321SA55PF8 does not support word-wide (16-bit) or larger data paths without external multiplexing.
Does the 71V321SA55PF8 support battery backup or data retention below 3.3 V?
No - the 71V321SA55PF8 is the 'S' (standard power) variant and does not include battery backup capability. Only the 'L' (low-power) versions (e.g., 71V321L55PF8) specify 2.0 V minimum data retention voltage and microamp-level standby current. The 71V321SA55PF8 requires continuous 3.3 V ± 0.3 V supply for reliable operation and data retention.
How does BUSY arbitration work on the 71V321SA55PF8, and what triggers BUSYL or BUSYR?
BUSY arbitration on the 71V321SA55PF8 activates when both ports attempt to access the same memory address simultaneously - determined solely by matching A0–A10 and asserting CEL/CER low. BUSYL goes low if the right port wins arbitration; BUSYR goes low if the left port wins. The 71V321SA55PF8 does not consider R/W state or OE in arbitration - only address and chip-enable alignment.
Can the interrupt flags (INTL and INTR) on the 71V321SA55PF8 be used as open-drain outputs?
Yes - although the 71V321SA55PF8 datasheet specifies INTL and INTR as totem-pole outputs, application notes and pin configuration diagrams confirm they are compatible with open-drain usage when externally pulled up. This allows wired-OR interrupt aggregation across multiple devices. The 71V321SA55PF8 interrupt behavior remains unchanged: INTL asserts on right-port write to 0x7FE; INTR asserts on left-port write to 0x7FF.
What package type and footprint does the 71V321SA55PF8 use, and are there thermal or layout constraints?
The 71V321SA55PF8 uses a 64-pin TQFP (Thin Quad Flat Pack), package code PNG64, with 10 mm × 10 mm body and 0.5 mm lead pitch. Layout requires strict adherence to Renesas' recommended decoupling: one 0.1 µF ceramic capacitor per VCC pin pair, placed within 3 mm of each pin. Thermal vias under the exposed pad (if present) are not applicable - the PNG64 variant has no thermal pad.
71V321SA55PF8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 55ns
- Access Time:
- 55 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
71V321SA55PF8 FAQ
1.How can I place an order for 71V321SA55PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321SA55PF8 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 71V321SA55PF8 reliable?
The price and inventory of 71V321SA55PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321SA55PF8 is usually 5 days.
3.What payment methods are accepted for 71V321SA55PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321SA55PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321SA55PF8?
71V321SA55PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321SA55PF8 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 71V321SA55PF8?
For technical support, including 71V321SA55PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321SA55PF8 requirements.
6.How does Aetrix verify that 71V321SA55PF8 is sourced from the original manufacturer or authorized distributors?
All 71V321SA55PF8 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 71V321SA55PF8 meets industry standards.
7.What is the process for return or replacement of 71V321SA55PF8?
All 71V321SA55PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321SA55PF8, 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 71V321SA55PF8 part is unused and in its original packaging.
Return procedure for 71V321SA55PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321SA55PF8 Tags
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