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Renesas 71321SA55TFI8
- Part No.:
- 71321SA55TFI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321SA55TFI8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,050
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Product details
Overview
IDT71321SA55TFI8 from Integrated Device Technology is a high-speed 2K × 8 dual-port static RAM with interrupt logic and on-chip arbitration, designed as a MASTER device for interprocessor communication. It delivers 55 ns max read/write cycle time, operates at 5V ±10%, supports industrial temperature (–40°C to +85°C), and features open-drain BUSY/INT outputs requiring 270Ω pull-up resistors - used in real-time embedded control systems with concurrent CPU/DSP access.
For engineers reviewing the IDT71321SA55TFI8 datasheet, IDT71321SA55TFI8 pinout, IDT71321SA55TFI8 application, or IDT71321SA55TFI8 equivalent, key selection criteria include its master-mode arbitration logic, dual-interrupt flag support (INTL/INTR), 52-pin STQFP package with verified pin mapping, and compatibility with IDT71421SLAVE devices in 16-bit+ memory expansion.
Technical Context
The IDT71321SA55TFI8 implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves port contention via BUSY flag generation based on chip enable (CEL/CER) and address match timing - not R/W state - ensuring deterministic write inhibition during simultaneous access to identical addresses.
Interrupt functionality uses dedicated mailbox addresses (7FEh for INTL, 7FFh for INTR) with set/reset behavior defined by port-specific write patterns. The device supports battery backup data retention only in LA variants; this SA version provides 55 ns timing with 325 mW typical active power and 5 mW standby power at industrial temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (16,384 bits), dual-port SRAM with independent left/right access paths |
| Access Time (max) | 55 ns - defines minimum read/write cycle time for synchronous system timing budgeting |
| Supply Voltage | 5.0 V ±10% - requires single TTL-compatible rail; all VCC pins must be connected |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and motor drive applications |
| Active Current (typ) | 110 mA - translates to ~325 mW typical power consumption during full-port operation |
| Standby Current (typ) | 30 mA - enables low-power idle mode when both CE inputs are high |
| BUSY/INT Output Type | Open-drain - mandates external 270Ω pull-up resistor per signal for proper logic level translation |
Pinout & Package
Package: 52-pin STQFP (PPG52), 10 mm × 10 mm × 1.4 mm body, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (000h–7FFh) |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access (000h–7FFh) |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; high-impedance when OER = VIH or CER = VIH |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls power-down mode when high |
| OEL / OER | Output enable (left/right) | Active-low enables data output drivers; does not affect write path |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of I/O bus transfer |
| INTL / INTR | Interrupt flags (left/right) | Open-drain outputs asserted when opposite port writes to 7FEh/7FFh |
| BUSYL / BUSYR | Busy flags (left/right) | Open-drain outputs indicating port contention; require 270Ω pull-up |
| VCC / GND | Power supply pins | Multiple VCC/GND pins must all be connected to maintain signal integrity and thermal stability |
Key Features
| Feature | Design Value |
|---|---|
| Master-mode arbitration logic | Resolves simultaneous left/right port access to same address without external logic, using BUSY assertion based on CE/address timing |
| Dual interrupt mailbox architecture | Enables hardware-synchronized interprocessor messaging via dedicated 7FEh (INTL) and 7FFh (INTR) locations |
| Asynchronous dual-port operation | Permits independent, non-synchronized reads/writes from either port - critical for real-time CPU/DSP co-processing |
| Low-power standby modes | Supports four distinct standby states (ISB1–ISB4) with sub-1 mA full-standby current under CMOS-level inputs |
| 52-pin STQFP packaging | Enables compact PCB layout with verified thermal performance and industrial-grade reliability at –40°C to +85°C |
Applications
| Industrial Motion Control | Real-Time DSP Co-Processing |
|---|---|
Use Scenario: Dual-CPU system where PLC main controller and servo motion engine concurrently access shared parameter tables and status registers. IC Role / Device Role / Timing Role: IDT71321SA55TFI8 acts as MASTER dual-port RAM enabling deterministic arbitration and interrupt-driven command handoff between controllers. Use Value: Eliminates software polling with hardware BUSY/INT signals, reducing inter-processor latency to ≤55 ns and preventing data corruption during simultaneous access. |
Use Scenario: Audio processing platform with ARM host CPU and TI C6000 DSP sharing filter coefficients, FFT buffers, and real-time control flags. IC Role / Device Role / Timing Role: IDT71321SA55TFI8 serves as low-latency shared memory with mailbox interrupts synchronizing DMA transfers and algorithm updates. Use Value: Enables zero-wait-state memory access for both processors, supporting 48 kHz audio frame rates with guaranteed <1 µs interrupt response for buffer management. |
| Avionics Data Acquisition | Medical Imaging Subsystem |
Use Scenario: Flight data recorder subsystem where sensor acquisition MCU and safety-critical monitoring processor share telemetry buffers and fault logs. IC Role / Device Role / Timing Role: IDT71321SA55TFI8 functions as radiation-tolerant (industrial temp-rated) shared memory with hardware-enforced write protection during contention. Use Value: Ensures deterministic BUSY arbitration prevents overwrites during transient sensor bursts, meeting DO-254 functional safety timing requirements. |
Use Scenario: MRI image reconstruction module where FPGA-accelerated backprojection engine and ARM-based UI controller exchange raw k-space data and reconstructed slices. IC Role / Device Role / Timing Role: IDT71321SA55TFI8 provides 55 ns-access shared buffer with interrupt-triggered slice handoff to minimize display latency. Use Value: Sustains >200 MB/s effective throughput across ports, enabling real-time preview of reconstructed images without frame drops. |
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 CY7C1371DV33-55AC | 3.3V core, 55 ns access, QDR interface; no native BUSY arbitration or interrupt mailboxes | Requires external logic for contention resolution; suited for high-bandwidth streaming, not interprocessor messaging | Select when migrating to 3.3V systems and prioritizing bandwidth over hardware arbitration |
| IDT71421SA55TFI8 | SLAVE-only variant; BUSY pins are inputs (not outputs); no on-chip arbitration logic | Must be paired with IDT71321 as MASTER; used only in width-expanded 16-bit+ configurations | Choose only as companion to IDT71321SA55TFI8 in multi-chip memory arrays |
Compared with CY7C1371DV33-55AC and IDT71421SA55TFI8, the IDT71321SA55TFI8 uniquely integrates master-mode arbitration and dual-interrupt mailboxes in a 5V industrial package - making it irreplaceable for deterministic, low-latency interprocessor communication without external glue logic.
Availability
IDT71321SA55TFI8 is available at Aetrix Electronics and suitable for industrial motion control, avionics data acquisition, and medical imaging subsystems requiring stable component supply across extended product lifecycles.
Supply support for IDT71321SA55TFI8 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, is a fabless semiconductor company specializing in timing, memory interface, and RF power solutions for communications and computing infrastructure.
IDT71321SA55TFI8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems requiring hardware arbitration and interrupt-driven synchronization.
FAQ
What is the function of BUSYL and BUSYR on the IDT71321SA55TFI8?
BUSYL and BUSYR are open-drain outputs on the IDT71321SA55TFI8 that indicate port contention when both left and right ports attempt simultaneous access to the same memory address. They require external 270Ω pull-up resistors and assert low to inhibit writes on the contending port - a core feature of its MASTER arbitration logic.
Can the IDT71321SA55TFI8 operate with only one port enabled?
Yes. The IDT71321SA55TFI8 supports independent port operation: setting CEL = VIH disables the left port (entering standby), while CER = VIH disables the right port. Each port maintains full 2K × 8 access when enabled, and standby current drops to ≤30 mA for single-port active use.
Does the IDT71321SA55TFI8 support battery backup data retention?
No. Battery backup data retention (down to 2V) is exclusive to LA variants like IDT71321LA55TFI8. The IDT71321SA55TFI8 is a standard-power SA version with 5V-only operation and no data retention capability below VCC min (4.5V).
How are the interrupt flags INTL and INTR triggered on the IDT71321SA55TFI8?
INTL is asserted when the right port writes to address 7FEh; INTR is asserted when the left port writes to 7FFh. Both flags are cleared by the respective port reading those same addresses with OE and CE active - enabling hardware-synchronized mailbox messaging without software polling.
What package type is used for the IDT71321SA55TFI8?
The IDT71321SA55TFI8 uses a 52-pin STQFP (PPG52) package measuring 10 mm × 10 mm × 1.4 mm. This surface-mount package is RoHS-compliant, optimized for industrial thermal performance, and matches the pinout shown in Figure 3a of the official datasheet DSC-2691/17.
71321SA55TFI8 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (10x10)
71321SA55TFI8 FAQ
1.How can I place an order for 71321SA55TFI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321SA55TFI8 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 71321SA55TFI8 reliable?
The price and inventory of 71321SA55TFI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321SA55TFI8 is usually 5 days.
3.What payment methods are accepted for 71321SA55TFI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321SA55TFI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321SA55TFI8?
71321SA55TFI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321SA55TFI8 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 71321SA55TFI8?
For technical support, including 71321SA55TFI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321SA55TFI8 requirements.
6.How does Aetrix verify that 71321SA55TFI8 is sourced from the original manufacturer or authorized distributors?
All 71321SA55TFI8 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 71321SA55TFI8 meets industry standards.
7.What is the process for return or replacement of 71321SA55TFI8?
All 71321SA55TFI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321SA55TFI8, 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 71321SA55TFI8 part is unused and in its original packaging.
Return procedure for 71321SA55TFI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321SA55TFI8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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