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Renesas 71321SA55PFI8
- Part No.:
- 71321SA55PFI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321SA55PFI8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,686
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Product details
Overview
IDT71321SA55PFI8 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 on single 5V ±10% supply, supports industrial temperature range (–40°C to +85°C), and features open-drain BUSY/INT outputs requiring 270Ω pull-up resistors - used in real-time embedded control systems requiring concurrent memory access.
For engineers reviewing the IDT71321SA55PFI8 datasheet, IDT71321SA55PFI8 pinout, IDT71321SA55PFI8 application, or IDT71321SA55PFI8 equivalent, key selection criteria include its MASTER arbitration capability, 55 ns timing grade, PLCC-52 package compatibility, and dual-interrupt flag support for mailbox-style processor synchronization.
Technical Context
The IDT71321SA55PFI8 implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves port contention using address and chip-enable signals only - not R/W state - and asserts BUSYL/BUSYR outputs to inhibit writes during conflict.
As a MASTER device, it provides BUSY output flags (open-drain) and two INT flags (INTL/INTR) tied to dedicated mailbox addresses (7FEh/7FFh); SLAVE devices (e.g., IDT71421) use BUSY as input and lack arbitration logic. The part supports battery backup data retention only in LA variants - not applicable to this SA-grade device.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), fully random-access dual-port array |
| Access Time (tAA) | 55 ns max - defines worst-case delay from valid address to stable data output |
| Read Cycle Time (tRC) | 55 ns max - minimum interval between successive read operations on same port |
| Supply Voltage | 4.5 V to 5.5 V - TTL-compatible single 5V ±10% rail; all VCC pins require connection |
| Operating Temperature | –40°C to +85°C - industrial grade, qualified for embedded control and automation environments |
| Standby Current (ISB1) | 20 mA max (typ. 20 mA) - power consumed when both ports disabled (CE = VIH) at fMAX |
| Dynamic Current (ICC) | 65 mA typ. - active power draw during concurrent dual-port reads/writes at 55 ns speed |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 19.05 mm × 19.05 mm × 4.32 mm, lead pitch 1.27 mm, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (0–2047) |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access (0–2047) |
| 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 drivers; overrides R/W for output control |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of I/O bus |
| INTL / INTR | Interrupt flags (left/right) | Open-drain outputs asserted on mailbox writes (7FEh/7FFh); require pull-up |
| BUSYL / BUSYR | Busy flags (left/right) | Open-drain outputs indicating port contention; require 270Ω pull-up per note |
| VCC / GND | Power supply | All VCC pins must be connected to 5V; all GND pins to ground - no floating pins |
Key Features
| Feature | Design Value |
|---|---|
| On-chip port arbitration logic | Resolves simultaneous access conflicts without external logic; uses CE + address match only |
| Dual interrupt mailbox addressing | Hardware-interrupt generation via dedicated SRAM locations (7FEh for INTL, 7FFh for INTR) |
| Asynchronous dual-port operation | Independent left/right control allows concurrent read/write to different addresses with no clock required |
| Low-power standby modes | ISB1 = 20 mA max (both ports disabled); ISB3 = 1.0 mA max (CMOS-level inputs, full standby) |
| Industrial temperature qualification | Guaranteed functionality across –40°C to +85°C ambient, validated for factory automation and motor control |
Applications
| Real-Time Dual-Processor Communication | Industrial PLC Memory Buffer |
|---|---|
Use Scenario: Two microcontrollers exchange status and command data via shared memory without software polling or OS intervention. IC Role / Device Role / Timing Role: MASTER dual-port RAM acts as hardware-synchronized mailbox with BUSY arbitration and INT flags for event-driven signaling. Use Value: Eliminates race conditions during concurrent access; 55 ns timing ensures sub-microsecond response for deterministic control loops. |
Use Scenario: Programmable Logic Controller stores I/O scan results and configuration parameters accessible by both CPU and firmware update engine. IC Role / Device Role / Timing Role: High-reliability static RAM provides nonvolatile shadow memory with hardware write-inhibit during firmware updates. Use Value: Prevents memory corruption during hot updates; industrial temp rating ensures stable operation in cabinet-mounted PLCs. |
| Avionics Data Crossfeed Interface | Medical Imaging Frame Buffer |
Use Scenario: Redundant flight control computers share sensor fusion data and actuator commands through synchronized memory access. IC Role / Device Role / Timing Role: MASTER IDT71321SA55PFI8 coordinates arbitration between primary and backup processors using BUSY/INT signals. Use Value: Hardware-enforced atomicity avoids data inconsistency; 55 ns latency meets DO-254 deterministic timing requirements. |
Use Scenario: MRI or CT scanner subsystems buffer image frames between acquisition FPGA and display processor with zero-copy transfer. IC Role / Device Role / Timing Role: Dual-port SRAM serves as ping-pong frame buffer enabling continuous capture while rendering previous frame. Use Value: Concurrent read/write eliminates frame drop; 2K × 8 capacity supports 16-bit grayscale line buffers in compact footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT71321SA35PFI8 | 35 ns max access time; lower speed grade, reduced ICC (80 mA typ.) and ISB1 (25 mA max) | Suitable for cost-sensitive designs where 55 ns timing margin is unnecessary | Select when system timing budget allows slower memory and lower power consumption is prioritized |
| CY7C024AV-55AXC | Cypress 2K × 16 dual-port SRAM; wider data bus, 55 ns timing, 3.3V/5V tolerant I/O, no built-in arbitration logic | Requires external logic for BUSY arbitration; better suited for 16-bit data paths | Choose when 16-bit word width is needed and arbitration can be implemented externally |
Compared with IDT71321SA55PFI8, the 35 ns variant trades speed for lower power and cost, while the Cypress CY7C024AV-55AXC offers double data width but lacks integrated arbitration - increasing BOM count and layout complexity for contention management.
Availability
IDT71321SA55PFI8 is available at Aetrix Electronics and suitable for real-time embedded control, industrial PLC memory buffering, and avionics crossfeed interfaces requiring stable component supply and long-term industrial temperature support.
Supply support for IDT71321SA55PFI8 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 solutions for communications and industrial markets.
IDT71321SA55PFI8 belongs to IDT's legacy dual-port SRAM product line, engineered for deterministic interprocessor communication in safety-critical embedded systems where hardware arbitration and interrupt signaling eliminate software overhead.
FAQ
What is the function of BUSYL and BUSYR on the IDT71321SA55PFI8?
BUSYL and BUSYR are open-drain output flags on the IDT71321SA55PFI8 that indicate port contention during simultaneous access to the same memory location. When asserted (driven LOW), they inhibit writes on the respective port. Each requires an external 270Ω pull-up resistor to VCC per datasheet Note 2. These signals are exclusive to MASTER devices like the IDT71321SA55PFI8 and are not present as outputs on SLAVE variants.
Does the IDT71321SA55PFI8 support battery backup data retention?
No, the IDT71321SA55PFI8 does not support battery backup data retention. That feature is exclusive to LA-grade variants (e.g., IDT71321LA55PFI8), which guarantee data retention down to 2.0 V. The "SA" suffix denotes standard active power consumption and excludes the low-voltage retention circuitry - confirmed by absence of VDR and ICCDR parameters in SA-specific DC tables.
How are the interrupt flags INTL and INTR triggered on the IDT71321SA55PFI8?
INTL is asserted when the right port writes to address 7FEh (hex); INTR is asserted when the left port writes to address 7FFh (hex). Both flags are open-drain outputs requiring pull-up resistors. Clearing is performed by reading the same address with OE enabled - e.g., accessing 7FEh with OEL = VIL and CEL = VIL clears INTL. This mailbox mechanism is defined in Truth Table II and applies identically across all speed grades of IDT71321SA55PFI8.
Can the IDT71321SA55PFI8 operate with mixed voltage interfaces?
No, the IDT71321SA55PFI8 is strictly a 5V-only device: VCC must be 4.5–5.5 V, and input thresholds (VIH = 2.2 V min, VIL = 0.8 V max) are TTL-compatible. It does not support 3.3V or mixed-voltage I/O. Driving inputs from 3.3V logic may violate VIL/VIL margins under worst-case conditions; level-shifting is required for interoperability with lower-voltage controllers.
What package options are available for the IDT71321SA55PFI8?
The IDT71321SA55PFI8 is offered exclusively in the 52-pin PLCC (Plastic Leaded Chip Carrier) package, as indicated by the "PFI8" suffix. While the IDT71321 family also supports 52-pin STQFP, 64-pin TQFP, and 64-pin STQFP, the PFI8 variant maps specifically to PLCC-52 per IDT ordering information and package code documentation in DSC-2691/17.
71321SA55PFI8 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 (14x14)
71321SA55PFI8 FAQ
1.How can I place an order for 71321SA55PFI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321SA55PFI8 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 71321SA55PFI8 reliable?
The price and inventory of 71321SA55PFI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321SA55PFI8 is usually 5 days.
3.What payment methods are accepted for 71321SA55PFI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321SA55PFI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321SA55PFI8?
71321SA55PFI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321SA55PFI8 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 71321SA55PFI8?
For technical support, including 71321SA55PFI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321SA55PFI8 requirements.
6.How does Aetrix verify that 71321SA55PFI8 is sourced from the original manufacturer or authorized distributors?
All 71321SA55PFI8 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 71321SA55PFI8 meets industry standards.
7.What is the process for return or replacement of 71321SA55PFI8?
All 71321SA55PFI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321SA55PFI8, 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 71321SA55PFI8 part is unused and in its original packaging.
Return procedure for 71321SA55PFI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321SA55PFI8 Tags
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