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Renesas 71342SA25PF
- Part No.:
- 71342SA25PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71342SA25PF.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,614
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Product details
Overview
IDT71342SA25PF from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 25 ns (max) access time, TTL-compatible with single +5 V ±10% supply, and rated for industrial temperature range (–40°C to +85°C). It supports fully asynchronous, independent read/write access from left and right ports and enables interprocessor resource arbitration in real-time embedded control systems.
For engineers reviewing the IDT71342SA25PF datasheet, IDT71342SA25PF pinout, IDT71342SA25PF application, or IDT71342SA25PF equivalent, key selection considerations include dual-port timing isolation, hardware semaphore flag contention resolution, 52-pin PLCC package compatibility, and low-power standby modes (ISB3 = 1.0 mA typ.) for battery-backed systems.
Technical Context
The IDT71342SA25PF implements two fully independent asynchronous memory ports sharing a 4K × 8 SRAM array and eight dedicated semaphore latches accessed via A0–A2 under SEM = VIL. Each port has separate CE, OE, R/W, address (A0L–A11L / A0R–A11R), and bidirectional I/O (I/O0L–I/O7L / I/O0R–I/O7R) signals.
Semaphore operation uses active-low token passing: writing '0' to a flag grants exclusive write access to that side; reading returns the flag state across all 8 data bits. Flag arbitration resolves simultaneous requests deterministically-first arrival wins; exact tie yields arbitrary but guaranteed single-side assignment per Truth Table II.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4K × 8 (32,768 bits), organized as two independent 4K × 8 ports |
| Access Time (tAA) | 25 ns max - defines minimum address-to-valid-data delay for reliable high-speed CPU/DSP interfacing |
| Supply Voltage | +5.0 V ±10% - compatible with legacy TTL and 5 V microcontroller buses without level shifting |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and motor drive applications |
| Standby Current (ISB3) | 1.0 mA typical - enables ultra-low-power retention mode when both ports are deselected with CMOS-level inputs |
| Semaphore Count | 8 independent binary flags - supports concurrent arbitration for up to eight shared resources or critical sections |
| Package | 52-pin PLCC (PLG52) - surface-mount compatible with standard reflow profiles and repair-friendly socketing |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 20.0 mm × 20.0 mm × 4.3 mm, lead pitch 0.635 mm.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 52 | N/C | No internal connection - must be left unconnected or tied to GND per layout best practice |
| 2 | GND | Ground reference for all port logic and memory array - requires low-impedance PCB plane connection |
| 3–10 | I/O4L–I/O7L | Left-port bidirectional data lines - share pins for read output and write input; high-impedance when OEL = VIH |
| 11–18 | I/O0R–I/O7R | Right-port bidirectional data lines - electrically isolated from left port; support concurrent read/write |
| 19–30 | A0R–A11R | Right-port address inputs - decode 4K locations (A0–A11); no effect on semaphore space (A0–A2 only) |
| 31–32 | R/WR, CER | Right-port write enable and chip enable - R/WR controls direction; CER = VIL activates right port |
| 33–34 | OER, A0L | Right-port output enable and left-port address bit 0 - OER = VIL enables I/O0R–I/O7R drivers |
| 35–44 | A1L–A10L | Left-port address inputs - identical function to A0R–A11R; A11L maps to pin 44 |
| 45–46 | I/O0L, I/O1L | Left-port data bits 0 and 1 - used for semaphore write (D0 only) and full 8-bit read (all bits reflect flag state) |
| 47–48 | A11L, SEMR | Left-port address bit 11 and right-port semaphore enable - SEMR = VIL selects semaphore space on right port |
| 49–51 | SEML, R/WL, CEL | Left-port semaphore enable, write enable, and chip enable - SEML = VIL activates left-port semaphore access |
Key Features
| Feature | Design Value |
|---|---|
| Fully asynchronous dual-port architecture | Enables simultaneous, independent read/write operations from left and right ports without cycle penalty or arbitration overhead |
| Hardware semaphore logic block | Eight dedicated, contention-resolving binary flags accessible via A0–A2 under SEM = VIL - eliminates software-only spinlock latency |
| Automatic power-down control | CE and SEM pins gate port-specific standby current (ISB3 = 1.0 mA typ.) - reduces system power during idle intervals |
| TTL-compatible I/O interface | Operates directly with 5 V microcontrollers, DSPs, and FPGAs without level translators or external pull-ups |
| Industrial temperature qualification | Validated operation from –40°C to +85°C - suitable for motor drives, PLCs, and outdoor industrial controllers |
Applications
| Industrial Motion Control | Dual-CPU Communication Bridge |
|---|---|
Use Scenario: Two independent motion controllers coordinate axis positioning in a CNC machine using shared trajectory buffers. IC Role / Device Role / Timing Role: IDT71342SA25PF serves as dual-access shared memory with hardware semaphore arbitration to prevent buffer overwrites during real-time path updates. Use Value: Eliminates 10–15 µs software handshake delays per resource access, enabling sub-millisecond coordination between axes. |
Use Scenario: A safety-critical main CPU and a redundant monitoring CPU exchange status and fault logs in an avionics subsystem. IC Role / Device Role / Timing Role: IDT71342SA25PF provides lock-free, deterministic interprocessor communication channel with atomic flag-based synchronization. Use Value: Guarantees zero wait-state access to shared log entries, meeting DO-254 Level A timing requirements for failure response. |
| Real-Time Digital Signal Processing | Programmable Logic Controller (PLC) I/O Mapping |
Use Scenario: A DSP core writes processed sensor data into shared memory while a host ARM processor reads it for HMI display and network upload. IC Role / Device Role / Timing Role: IDT71342SA25PF acts as zero-latency FIFO buffer with semaphore-controlled ownership handoff between processing domains. Use Value: Sustains 40 MB/s sustained throughput (25 ns cycle × 8 bits) without DMA stalls or cache coherency overhead. |
Use Scenario: A PLC backplane uses dual CPUs to manage distributed I/O modules - one handles analog inputs, the other manages digital outputs. IC Role / Device Role / Timing Role: IDT71342SA25PF stores synchronized I/O image tables with semaphore-protected update cycles to prevent partial writes. Use Value: Ensures atomic 8-byte I/O state transfers, eliminating transient misreads during hot-swap or firmware update events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM with semaphore applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C136-25JC | 4K × 8, 25 ns, 5 V, 52-pin PLCC - lacks integrated semaphore logic; requires external arbitration logic | Requires additional CPLD/FPGA glue logic and PCB area for semaphore emulation - increases BOM cost and debug complexity | Select only if existing design already implements external semaphore control and footprint reuse is mandatory |
| IDT71322LA25PF | 2K × 8, 25 ns, 5 V, 52-pin PLCC - same family, lower density, LA variant with 2 V data retention | Halves available shared memory space; retains battery backup capability not needed in IDT71342SA25PF's industrial use case | Choose only for space-constrained designs where 2K × 8 suffices and 2 V retention adds value |
Compared with CY7C136-25JC and IDT71322LA25PF, the IDT71342SA25PF delivers unique on-die semaphore arbitration in a drop-in 52-pin PLCC package - reducing system latency by eliminating external logic and preserving full 4K × 8 shared memory capacity without sacrificing industrial temperature rating.
Availability
IDT71342SA25PF is available at Aetrix Electronics and suitable for industrial motion control, dual-CPU communication bridges, real-time DSP buffering, and programmable logic controller I/O mapping requiring stable component supply across extended product lifecycles.
Supply support for IDT71342SA25PF 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, RF, and high-performance computing solutions.
The IDT71342SA25PF belongs to IDT's dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor communication in real-time industrial and embedded systems.
FAQ
What is the maximum operating speed of the IDT71342SA25PF?
The IDT71342SA25PF guarantees a maximum access time of 25 ns (tAA) across the full industrial temperature range (–40°C to +85°C), supporting read cycle times down to 25 ns. This enables direct interfacing with 40 MHz microcontrollers and DSPs without wait states, and is validated under VCC = 5.0 V ±10% conditions per datasheet Table 09a.
Does the IDT71342SA25PF support battery backup operation?
No - the IDT71342SA25PF is the SA (standard power) variant and does not support battery backup data retention. Only the LA variant (e.g., IDT71342LA25PF) specifies 2 V data retention capability. The SA version draws ISB3 = 1.0 mA typical in full standby mode but requires continuous +5 V supply for memory retention.
How are the semaphore flags accessed on the IDT71342SA25PF?
Semaphore flags are accessed by asserting SEM = VIL (SEML for left port, SEMR for right port) while holding CE = VIH, then applying address A0–A2 (only these three bits matter) and using R/W and OE as in standard SRAM access. Writing to D0 sets the flag; reading returns the flag state across all eight I/O lines - a critical behavior confirmed in Truth Table II and Functional Description section.
What is the pin-compatible replacement for the IDT71342SA25PF in 52-pin PLCC?
The IDT71342SA25PF has no pin-compatible drop-in replacement with identical 4K × 8 density and integrated semaphore logic. The IDT71342LA25PF shares the same pinout and timing but adds 2 V data retention - making it a functional upgrade, not a direct substitute, due to differing power and retention specs.
Can both ports of the IDT71342SA25PF perform read and write operations simultaneously?
Yes - the IDT71342SA25PF supports true concurrent access: the left port can execute a write while the right port reads a different memory location, or both ports can read simultaneously. Conflict only arises on identical addresses (non-semaphore) during simultaneous write or read/write - resolved by system-level semaphore coordination, not device arbitration.
71342SA25PF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
71342SA25PF FAQ
1.How can I place an order for 71342SA25PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 71342SA25PF 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 71342SA25PF reliable?
The price and inventory of 71342SA25PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71342SA25PF is usually 5 days.
3.What payment methods are accepted for 71342SA25PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71342SA25PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71342SA25PF?
71342SA25PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71342SA25PF 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 71342SA25PF?
For technical support, including 71342SA25PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71342SA25PF requirements.
6.How does Aetrix verify that 71342SA25PF is sourced from the original manufacturer or authorized distributors?
All 71342SA25PF 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 71342SA25PF meets industry standards.
7.What is the process for return or replacement of 71342SA25PF?
All 71342SA25PF units undergo pre-shipment inspection (PSI). If there is an issue with 71342SA25PF, 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 71342SA25PF part is unused and in its original packaging.
Return procedure for 71342SA25PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71342SA25PF Tags
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M24C02-WMN6TP
STMicroelectronics
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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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