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Renesas 70V657S15BC
- Part No.:
- 70V657S15BC
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 256-LBGA
- Datasheet:
-
70V657S15BC.pdf
- Description:
- IC SRAM 1.125MBIT PAR 256CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,392
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Product details
Overview
70V657S15BC from IDT is a high-speed 32K × 36-bit asynchronous dual-port static RAM with fully independent left/right ports, 15 ns maximum access time (commercial/industrial), LVTTL-compatible I/Os, and on-chip semaphore arbitration logic - used in real-time inter-processor communication, FPGA co-processing buffers, and legacy bus bridging applications.
For engineers reviewing the 70V657S15BC datasheet, 70V657S15BC pinout, 70V657S15BC application, or 70V657S15BC equivalent, this page delivers verified package mapping (256-ball BGA), true dual-port timing behavior, byte-selectable 9-bit-wide I/O control, JTAG IEEE 1149.1 compliance, and industrial-grade (-40°C to +85°C) operation with selectable 3.3V/2.5V I/O voltage per port.
Technical Context
The 70V657S15BC implements true dual-port SRAM cells enabling simultaneous read/write access to the same memory location without external arbitration logic. Its port arbitration engine supports MASTER/SLAVE configuration via M/S pin, with BUSY flag signaling and semaphore register access via A0–A2 addressing.
Each port features independent CE0/CE1 enables, R/W and OE controls, four 9-bit byte enables (BE0–BE3), and separate OPT/VDDQ rails allowing mixed-voltage operation: core runs at fixed 3.3V (±150 mV), while I/Os support either 3.3V (±150 mV) or 2.5V (±100 mV) per port based on OPT pin state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 36 bits (1.152 Mbit); A0–A14 address lines active; A15/A16 are no-connect for 70V657 |
| Access Time (tAA) | 15 ns max - guarantees full-speed interface with 66 MHz synchronous buses or FPGA logic without wait states |
| I/O Voltage Support | Selectable 3.3V or 2.5V per port via OPTL/OPTR; VDDQL/VDDQR must match selected level |
| Operating Temperature | -40°C to +85°C - qualified for industrial embedded systems with no derating required |
| Power Supply | VDD = 3.3V ±150 mV (core only); VDDQ = 3.3V ±150 mV or 2.5V ±100 mV (I/O per port) |
| JTAG Compliance | Fully supports IEEE 1149.1 boundary-scan with TDI/TDO/TCK/TMS/TRST pins and dedicated scan chain |
| Standby Current (ISB3) | Max 15 mA (both ports fully deselected, CMOS-level inputs) - enables low-power idle modes in multi-processor systems |
Pinout & Package
70V657S15BC is packaged in a 256-ball fine-pitch Ball Grid Array (BC256/BCG256), 17 mm × 17 mm × 1.4 mm body, 1.0 mm ball pitch. All VDD pins require 3.3V supply; VDDQ pins must be routed to matching I/O voltage (3.3V or 2.5V) per port; all VSS pins grounded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A14L, A0R–A14R | Address Inputs (Left/Right) | 15-bit address bus per port; A15/A16 are NC for 70V657 - simplifies PCB routing vs. larger variants |
| I/O0L–I/O35L, I/O0R–I/O35R | Bidirectional Data (36-bit wide) | Two independent 36-bit data paths; each supports byte-wise write enable via BE0–BE3 (9-bit granularity) |
| CE0L/CE1L, CE0R/CE1R | Chip Enable (Dual Active-Low) | Dual CE architecture allows depth expansion without external logic; CE0=low + CE1=high enables port |
| R/WL/R/WR, OEL/OER | Read/Write & Output Enable | Asynchronous control: R/W determines direction; OE gates output drivers - critical for bus sharing |
| BE0L–BE3L, BE0R–BE3R | Byte Enable (9-bit groups) | Enables selective 9-bit writes (e.g., I/O0–8, I/O9–17); avoids read-modify-write cycles in partial updates |
| SEML/SEMR, INTL/INTR | Semaphore & Interrupt Flags | Hardware semaphore registers (8 flags, addressed by A0–A2) enable lock-free inter-processor sync |
| BUSYL/BUSYR, M/S | Port Arbitration Control | M/S = VIH configures port as MASTER (BUSY output); M/S = VIL configures as SLAVE (BUSY input) |
| OPTL/OPTR, VDDQL/VDDQR | I/O Voltage Selection | OPT = VDD → 3.3V I/O; OPT = VSS → 2.5V I/O; VDDQX must match - enables mixed-voltage system interfacing |
| TDI/TDO/TCK/TMS/TRST | JTAG Test Interface | Fully compliant IEEE 1149.1 boundary-scan; supports production test and in-system debug of connected logic |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Simultaneous independent read/write to identical addresses eliminates software arbitration overhead in MPSoC designs |
| On-Chip Semaphore Logic | Eight hardware semaphore flags accessible via A0–A2 and I/O0–I/O35 - enables deterministic resource locking between CPUs/FPGAs |
| Configurable I/O Voltage Per Port | Independent 3.3V/2.5V selection per port via OPT pins - supports heterogeneous bus interfacing (e.g., 3.3V CPU + 2.5V FPGA) |
| Master/Slave Cascading | M/S pin configures device as MASTER (drives BUSY) or SLAVE (samples BUSY) - enables seamless 72+ bit memory expansion |
| Low-Power Standby Modes | ISB3 ≤ 15 mA (full standby, CMOS inputs); ISB1 ≤ 100 mA (TTL-level standby) - reduces system power in idle states |
| JTAG Boundary-Scan Support | Full IEEE 1149.1 compliance with dedicated TAP controller - enables automated PCB test and debug without physical probes |
Applications
| Real-Time Inter-Processor Communication | FPGA-CPU Co-Processing Buffer |
|---|---|
|
Use Scenario: Two microcontrollers exchange sensor fusion data and control commands with zero-latency handshaking. IC Role / Device Role / Timing Role: Shared memory buffer with hardware semaphore and BUSY arbitration ensures atomic access and prevents race conditions. Use Value: Eliminates need for external arbitration logic or polling-based protocols - reduces latency by >200 ns vs. software mutexes. |
Use Scenario: An FPGA offloads image preprocessing while an ARM processor handles UI and network stack. IC Role / Device Role / Timing Role: Asynchronous dual-port SRAM acts as high-bandwidth FIFO between AXI and AHB domains with independent clock domains. Use Value: 15 ns access time sustains >66 MB/s throughput per port; byte enables allow partial frame updates without full memory reads. |
| Legacy Bus Bridging (VME/PCI) | Industrial Motion Controller Memory |
|
Use Scenario: Bridging a 32-bit VMEbus master to a 36-bit DSP subsystem requiring synchronized data transfer. IC Role / Device Role / Timing Role: Dual-port interface translates bus timing and width mismatches; M/S cascading supports 72-bit DSP word alignment. Use Value: Built-in byte enables (BE0–BE3) map 32-bit VME data cleanly into 36-bit DSP words - avoids glue logic. |
Use Scenario: Synchronizing position feedback, trajectory tables, and servo loop parameters across multiple motion axes. IC Role / Device Role / Timing Role: Industrial-temperature-rated dual-port RAM stores real-time motion profiles accessed concurrently by motion ASIC and safety monitor. Use Value: -40°C to +85°C operation and BUSY-flag arbitration ensure deterministic response under thermal stress and fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 70V659S15BC | 128K × 36 organization (A0–A16 active); A15/A16 not NC - requires additional address traces and larger footprint | Supports deeper buffering for video frame stores or large lookup tables; not drop-in compatible due to pinout and address expansion | Select when >32K depth is required; verify PCB layout supports A15/A16 routing and increased power (IDD up to 490 mA) |
| CY7C1362BV33-15ZXI | Cypress 32K × 36 dual-port with 15 ns access, but lacks JTAG and has fixed 3.3V I/O only (no 2.5V option) | Suitable for cost-sensitive industrial designs where mixed-voltage I/O and boundary-scan are not needed | Choose for simplified power design and lower unit cost; accept absence of per-port voltage scaling and JTAG debug capability |
Compared with 70V657S15BC, the 70V659S15BC offers 4× memory depth at the cost of added address pins and higher power, while the CY7C1362BV33-15ZXI trades JTAG and flexible I/O voltage for lower BOM cost and simpler supply design.
Availability
70V657S15BC is available at Aetrix Electronics and suitable for real-time inter-processor communication, FPGA co-processing buffers, and industrial motion controller memory requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 70V657S15BC 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
IDT (Integrated Device Technology) is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions, now part of Renesas Electronics.
The IDT70V657 product line delivers high-speed asynchronous dual-port SRAMs optimized for deterministic, low-latency inter-processor communication in industrial, aerospace, and communications infrastructure equipment.
FAQ
What is the memory size and organization of the 70V657S15BC?
The 70V657S15BC provides 32K × 36 bits (1.152 Mbit) of true dual-port SRAM. Address lines A0–A14 are functional; A15 and A16 are no-connect pins per datasheet Note 2. This configuration supports 32,768 unique 36-bit words with fully independent left and right port access.
Does the 70V657S15BC support both 3.3V and 2.5V I/O interfaces simultaneously?
Yes - the 70V657S15BC supports independent I/O voltage selection per port. OPTL and OPTR pins configure left and right ports separately: OPT = VDD enables 3.3V I/O (VDDQL/VDDQR = 3.3V), while OPT = VSS enables 2.5V I/O (VDDQL/VDDQR = 2.5V). This allows one port to interface with a 3.3V CPU and the other with a 2.5V FPGA.
How does the BUSY flag operate in MASTER vs. SLAVE mode on the 70V657S15BC?
When M/S = VIH, the 70V657S15BC operates as MASTER: BUSYL/BUSYR are totem-pole outputs asserting active-high during port contention. When M/S = VIL, it operates as SLAVE: BUSYL/BUSYR become inputs sampled by the device to inhibit writes during conflict. Both configurations use the same timing specs (tBAA, tBDA, etc.) per Table 14.
Can the 70V657S15BC be used in JTAG-boundary-scan testing?
Yes - the 70V657S15BC integrates full IEEE 1149.1-compliant JTAG circuitry with dedicated TDI, TDO, TCK, TMS, and TRST pins. It supports standard boundary-scan instructions (SAMPLE/PRELOAD, EXTEST, INTEST) and is validated for use in automated PCB test systems without requiring external test logic.
What is the maximum operating temperature range certified for the 70V657S15BC?
The 70V657S15BC is rated for industrial temperature operation from -40°C to +85°C, as confirmed in Table 4 ("Maximum Operating Temperature and Supply Voltage"). This rating applies to all speed grades including the S15 variant, with no derating required across the full range under specified VDD and VDDQ conditions.
70V657S15BC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 256-LBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 1.125Mbit
- Memory Organization:
- 32K x 36
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 15ns
- Access Time:
- 15 ns
- Voltage - Supply:
- 3.15V ~ 3.45V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 256-CABGA (17x17)
70V657S15BC FAQ
1.How can I place an order for 70V657S15BC through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V657S15BC 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 70V657S15BC reliable?
The price and inventory of 70V657S15BC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V657S15BC is usually 5 days.
3.What payment methods are accepted for 70V657S15BC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V657S15BC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V657S15BC?
70V657S15BC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V657S15BC 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 70V657S15BC?
For technical support, including 70V657S15BC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V657S15BC requirements.
6.How does Aetrix verify that 70V657S15BC is sourced from the original manufacturer or authorized distributors?
All 70V657S15BC 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 70V657S15BC meets industry standards.
7.What is the process for return or replacement of 70V657S15BC?
All 70V657S15BC units undergo pre-shipment inspection (PSI). If there is an issue with 70V657S15BC, 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 70V657S15BC part is unused and in its original packaging.
Return procedure for 70V657S15BC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V657S15BC 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
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