My Inquiry
My Account
Renesas 70V25L55J
- Part No.:
- 70V25L55J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
70V25L55J.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,974
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
70V25L55J from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 55 ns read cycle time, 3.3 V single-supply operation, and integrated semaphore arbitration logic - used in real-time inter-processor communication systems requiring concurrent memory access without external logic.
For engineers reviewing the 70V25L55J datasheet, 70V25L55J pinout, 70V25L55J application, or 70V25L55J equivalent, key selection criteria include its 55 ns access timing, L-grade low-power standby current (660 µA typ.), TQFP-100 package compatibility, and native support for MASTER/SLAVE cascading in 32-bit+ memory expansion architectures.
Technical Context
The 70V25L55J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous read/write operations to the same memory location. Its on-chip arbitration logic resolves port contention via BUSY flag signaling and supports semaphore-based resource locking across processors.
It operates exclusively from a 3.3 V ±0.3 V supply, uses LVTTL-compatible I/O levels, and features automatic power-down when chip enable (CE) is deasserted - delivering 660 µA typical standby current. The device supports both RAM and semaphore register access modes controlled by SEM, UB/LB, and CE signal combinations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K x 16 (64 Kbit), true dual-port SRAM with independent left/right ports |
| Read Cycle Time (tRC) | 55 ns max - defines minimum clock period for reliable read operations at full speed |
| Supply Voltage | 3.3 V ±0.3 V - requires single LVTTL-compatible rail; no 5 V or mixed-voltage support |
| Standby Current (ISB3) | 660 µA typ. - enables ultra-low-power hold mode when both ports are disabled with CMOS-level inputs |
| Operating Temperature | -40°C to +85°C - qualified for industrial environments without derating |
| Package | 100-pin TQFP (PNG100), 14 mm × 14 mm × 1.4 mm - surface-mount compatible with standard reflow profiles |
| I/O Voltage Compatibility | LVTTL - interfaces directly with 3.3 V logic families without level-shifting circuitry |
Pinout & Package
70V25L55J is housed in a 100-pin Thin Quad Flatpack (TQFP) with exposed thermal pad (PNG100). Pin assignments follow IDT's standardized dual-port layout with mirrored left/right port signals, dedicated BUSY/INT flags, and M/S select for master/slave configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low per-port enable; disables internal circuitry and reduces power when deasserted |
| R/WL / R/WR | Read/Write Control (Left / Right) | Determines data direction on I/O bus; HIGH = read, LOW = write |
| OEL / OER | Output Enable (Left / Right) | Tri-states I/O drivers independently; allows shared bus usage without contention |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables 8-bit granularity access to 16-bit data bus - critical for multiplexed bus compatibility |
| SEML / SEMR | Semaphore Enable | Activates 8-flag semaphore register bank for inter-processor synchronization |
| BUSYL / BUSYR | Busy Flag (Input/Output) | When M/S = VIL: BUSY is input (slave); when M/S = VIH: BUSY is output (master) - enables hardware arbitration |
| INTL / INTR | Interrupt Flag | Open-drain push-pull output signals semaphore or memory event completion to host processor |
| A0L–A11L, A0R–A11R | Address Inputs | 12-bit address per port (4K depth); A12 is No Connect per datasheet Note 1 |
| I/O0L–I/O7L, I/O0R–I/O7R | Data I/O (Lower Byte) | Lower 8 bits of 16-bit data path; controlled by LBL/LBR |
| I/O8L–I/O15L, I/O8R–I/O15R | Data I/O (Upper Byte) | Upper 8 bits of 16-bit data path; controlled by UBL/UBR |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous reads/writes from independent processors without software arbitration overhead |
| On-Chip Semaphore Logic | Provides eight hardware-managed flags accessible via A0–A2 addressing - eliminates need for external lock registers |
| Master/Slave Cascading Support | Allows expansion to 32-bit+ data width using BUSY handshake and M/S pin - no external glue logic required |
| Low-Power Standby Mode | 660 µA typical ISB3 current enables battery-backed or energy-constrained embedded systems |
| Asynchronous Operation | No clock required - simplifies timing design in heterogeneous multi-processor systems with mismatched clocks |
Applications
| Industrial PLC Communication Module | Avionics Data Concentrator Unit |
|---|---|
Use Scenario: Two independent microcontrollers exchange sensor and actuator data in real time within a programmable logic controller chassis. IC Role / Device Role / Timing Role: Shared memory buffer with hardware semaphore arbitration ensures deterministic inter-CPU messaging without race conditions. Use Value: Eliminates software mutex overhead and guarantees sub-55 ns memory access latency between control and I/O processors. | Use Scenario: Multiple flight computers share telemetry and command buffers in a federated avionics architecture with strict DO-254 timing constraints. IC Role / Device Role / Timing Role: Dual-port SRAM acts as time-deterministic data exchange hub between ARINC-429 interface processor and safety-critical flight management unit. Use Value: 55 ns tRC and -40°C to +85°C operation meet airborne environmental and latency requirements without thermal derating. |
| Medical Imaging Signal Processor | Test & Measurement Pattern Generator |
Use Scenario: FPGA-based image acquisition engine writes raw pixel streams while DSP core reads and processes frames in parallel. IC Role / Device Role / Timing Role: High-bandwidth memory bridge enabling concurrent capture and analysis without frame buffering bottlenecks. Use Value: 4K × 16 organization and LVTTL compatibility allow direct FPGA/DSP interfacing at 18 Mbps sustained throughput. | Use Scenario: Automated test equipment synchronizes pattern generation and response capture across two independent timing domains. IC Role / Device Role / Timing Role: Dual-port RAM stores stimulus vectors and expected responses, accessed concurrently by pattern sequencer and comparator engines. Use Value: Hardware BUSY flag and semaphore support ensure atomic read-modify-write cycles during high-speed vector updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-55AXI | 55 ns access, 4K × 16, 3.3 V, but uses different pinout (100-pin TQFP variant with non-mirrored I/O) and lacks native M/S cascading logic | Requires external arbitration logic for multi-device expansion; not drop-in for BUSY-driven master/slave topologies | Select when board layout prioritizes Cypress footprint compatibility over seamless IDT ecosystem integration |
| AS7C34098B-55TIN | 55 ns, 4K × 16, 3.3 V, TQFP-100, but no integrated semaphore or BUSY arbitration - only basic dual-port functionality | Needs external semaphores and handshaking logic for inter-processor sync; increases BOM count and PCB area | Choose for cost-sensitive designs where arbitration is handled in firmware or external CPLD |
Compared with CY7C1362BV33-55AXI and AS7C34098B-55TIN, the 70V25L55J delivers unique value through its native M/S-selectable BUSY protocol and on-chip 8-flag semaphore bank - reducing system-level complexity and improving determinism in tightly coupled multi-processor systems.
Availability
70V25L55J is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, and medical imaging signal processors requiring stable component supply across extended product lifecycles.
Supply support for 70V25L55J 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, specializes in high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.
The 70V25L55J belongs to IDT's legacy 70V25/24 family of low-voltage dual-port SRAMs, engineered specifically for deterministic inter-processor communication in real-time embedded systems with stringent power and timing constraints.
FAQ
What is the maximum operating temperature range for the 70V25L55J?
The 70V25L55J is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings and Operating Conditions tables of the official IDT datasheet (DSC-5624/10), and applies across all speed grades including the 55 ns variant. No derating is required within this range.
Does the 70V25L55J support true simultaneous read operations from both ports?
Yes, the 70V25L55J implements true dual-port SRAM cells that allow concurrent reads from the left and right ports to the same memory location without conflict or delay. This capability is explicitly stated in the Features section of the datasheet and enabled by fully independent address, control, and data paths per port.
Is the 70V25L55J pin-compatible with other members of the IDT70V25/24 family?
Yes, the 70V25L55J shares the identical 100-pin TQFP (PNG100) package and pinout with all IDT70V25/24 variants, including 70V25S15, 70V25L20, and 70V24L55. Pin functions, voltage tolerances, and timing interface definitions are consistent across the family, enabling drop-in replacement for speed or power grade changes.
What is the role of the M/S pin on the 70V25L55J?
The M/S (Master/Slave Select) pin configures the 70V25L55J's BUSY signal behavior: when driven HIGH, BUSY becomes an output flag indicating local port contention; when driven LOW, BUSY serves as an input for cascaded slave operation. This enables hardware-controlled arbitration in multi-device 32-bit+ memory expansions without external logic.
How does the 70V25L55J handle semaphore operations?
The 70V25L55J provides eight dedicated hardware semaphore flags addressed via A0–A2. When SEM is asserted LOW and CE/UB/LB are HIGH, the device enters semaphore mode - allowing atomic read/write of flag states through I/O0–I/O15. This eliminates software race conditions in multi-processor resource locking scenarios.
70V25L55J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 84-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 128Kbit
- Memory Organization:
- 8K x 16
- 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:
- 84-PLCC (29.31x29.31)
70V25L55J FAQ
1.How can I place an order for 70V25L55J through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V25L55J 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 70V25L55J reliable?
The price and inventory of 70V25L55J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V25L55J is usually 5 days.
3.What payment methods are accepted for 70V25L55J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V25L55J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V25L55J?
70V25L55J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V25L55J 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 70V25L55J?
For technical support, including 70V25L55J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V25L55J requirements.
6.How does Aetrix verify that 70V25L55J is sourced from the original manufacturer or authorized distributors?
All 70V25L55J 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 70V25L55J meets industry standards.
7.What is the process for return or replacement of 70V25L55J?
All 70V25L55J units undergo pre-shipment inspection (PSI). If there is an issue with 70V25L55J, 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 70V25L55J part is unused and in its original packaging.
Return procedure for 70V25L55J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V25L55J Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
