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Renesas 70V657S15BF8
- Part No.:
- 70V657S15BF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 208-LFBGA
- Datasheet:
-
70V657S15BF8.pdf
- Description:
- IC SRAM 1.125MBIT PAR 208CABGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
70V657S15BF8 from IDT is a high-speed 32K × 36 asynchronous dual-port static RAM with true independent left/right ports, 15 ns maximum access time, LVTTL-compatible 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port. It enables simultaneous read/write to the same memory location in real-time inter-processor communication systems.
For engineers reviewing the 70V657S15BF8 datasheet, 70V657S15BF8 pinout, 70V657S15BF8 application, or 70V657S15BF8 equivalent, this page delivers verified specifications, port arbitration behavior, byte-enable granularity, JTAG 1149.1 compliance, and industrial-grade (-40°C to +85°C) operation for embedded control and telecom infrastructure designs.
Technical Context
This device implements fully asynchronous dual-port architecture with on-chip semaphore logic, automatic port arbitration, and independent chip enable (CE0/CE1), byte enable (BE0–BE3), and read/write (R/WL/R/WR) controls per port. Address lines A0–A14 are functional; A15L/A15R and A16L/A16R are no-connects for the 70V657 variant.
It supports MASTER/SLAVE cascading for 72-bit+ data width expansion using M/S pin control, with BUSY flag output (Master) or input (Slave), and non-tri-state totem-pole interrupt (INTL/INTR) and semaphore (SEML/SEMR) signals. JTAG boundary-scan is IEEE 1149.1-compliant with TDI/TDO/TCK/TMS/TRST pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 36 bits (1.152 Mbit), single memory array accessible from both ports |
| Access Time (tAA) | 15 ns max - guarantees deterministic latency for real-time inter-processor handshake |
| Supply Voltages | VDD = 3.3 V ±150 mV (core); VDDQL/VDDQR = 3.3 V ±150 mV or 2.5 V ±100 mV (I/O, selectable per port via OPTL/OPTR) |
| Operating Temperature | -40°C to +85°C - qualified for industrial environments without derating |
| Port Interface | Fully independent left/right ports with separate address (A0–A14), data (I/O0–I/O35), and control (CE0/CE1, R/W, OE, BE0–BE3) pins |
| JTAG Compliance | IEEE 1149.1 boundary-scan support with dedicated TDI/TDO/TCK/TMS/TRST pins for system-level testability |
| Power Management | Four standby modes: ISB1 (both ports deselected, 75 mA max), ISB3 (full CMOS standby, 15 mA max) |
Pinout & Package
70V657S15BF8 is packaged in a 208-ball fine-pitch BGA (BF208), 15 mm × 15 mm × 1.4 mm body, 0.8 mm ball pitch. All VDD pins require 3.3 V; VDDQL/VDDQR must match OPTL/OPTR selection (3.3 V or 2.5 V); all VSS pins connect to ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A14L / A0R–A14R | Address Inputs | 15-bit address bus per port; A15/A16 are NC for 70V657 |
| I/O0L–I/O35L / I/O0R–I/O35R | Bidirectional Data Bus | 36-bit parallel I/O per port; supports byte-wise access via BE0–BE3 |
| CE0L/CE1L / CE0R/CE1R | Chip Enable Inputs | Dual CE per port enables depth expansion without external logic |
| R/WL / R/WR | Read/Write Control | Active-low write enable; determines data direction on I/O bus |
| OEL / OER | Output Enable | Controls tri-state of I/O drivers during reads; independent per port |
| BE0L–BE3L / BE0R–BE3R | Byte Enable Inputs | Enables/disables 9-bit bytes (I/O0–8, 9–17, 18–26, 27–35) individually |
| SEML / SEMR | Semaphore Enable | Activates on-chip hardware semaphore flags (8 shared flags via A0–A2) |
| BUSYL / BUSYR | Busy Flag | Output when M/S = VIH (Master); input when M/S = VIL (Slave) - prevents concurrent writes to same address |
| INTL / INTR | Interrupt Flag | Non-tri-state totem-pole output signaling semaphore or arbitration events |
| M/S | Master/Slave Select | Configures BUSY as output (VIH) or input (VIL); required for cascaded 72-bit+ systems |
| OPTL / OPTR | I/O Voltage Select | VIH → 3.3 V I/O levels; VIL → 2.5 V I/O levels; sets VDDQL/VDDQR requirement |
| TDI/TDO/TCK/TMS/TRST | JTAG Test Interface | Full IEEE 1149.1 boundary-scan support for production test and debug |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Simultaneous independent read/write to identical memory locations - eliminates software arbitration overhead in multi-CPU systems |
| Hardware Semaphore Logic | On-chip 8-flag semaphore register accessible via A0–A2; enables atomic resource locking between ports without external logic |
| Asynchronous Port Operation | No clock required; each port operates independently with its own CE, R/W, and OE - ideal for mismatched processor timing domains |
| Selectable I/O Voltage | Per-port 3.3 V or 2.5 V interface via OPT pins - allows seamless integration with mixed-voltage SoCs and FPGAs |
| Depth Expansion Support | Dual CE0/CE1 per port enables stacking multiple devices without external decode logic - simplifies 72-bit+ memory subsystems |
| Industrial Temperature Range | Guaranteed operation from -40°C to +85°C with no performance derating - suitable for base stations, motor drives, and rail electronics |
Applications
| Telecom Line Card Buffering | Real-Time Industrial PLC |
|---|---|
|
Use Scenario: High-throughput packet buffering between DSP and FPGA on a 10G line card, requiring zero-latency inter-processor handshaking. IC Role / Device Role / Timing Role: Dual-port SRAM acts as shared mailbox memory; left port connects to DSP, right port to FPGA; BUSY flag prevents write collisions on shared registers. Use Value: 15 ns tAA ensures sub-20 ns round-trip register update, enabling deterministic 100 kHz control loop execution across processors. |
Use Scenario: Coordinating motion control tasks between ARM-based main controller and dedicated motion ASIC in CNC machinery. IC Role / Device Role / Timing Role: Acts as synchronized data exchange buffer; semaphore flags coordinate axis enable/disable sequences; M/S configuration supports master-slave topology. Use Value: Hardware semaphore eliminates polling delays, reducing inter-processor synchronization latency from >1 µs (software) to <8 ns (hardware). |
| Avionics Sensor Fusion Hub | Medical Imaging Data Pipeline |
|
Use Scenario: Aggregating inertial measurement unit (IMU), GPS, and barometer data streams into a central fusion processor in flight control systems. IC Role / Device Role / Timing Role: Dual-port SRAM buffers time-stamped sensor packets; left port accepts burst writes from ADC interfaces, right port feeds fused results to safety MCU. Use Value: Independent BE0–BE3 control allows partial writes (e.g., only IMU data) without disturbing GPS timestamp fields in same 36-bit word. |
Use Scenario: Real-time transfer of raw CT scan projection data from acquisition ASIC to reconstruction FPGA before GPU processing. IC Role / Device Role / Timing Role: Serves as high-bandwidth pipeline buffer; 36-bit width matches 16-bit pixel + 20-bit metadata format; JTAG enables in-system verification of data integrity. Use Value: 208-ball BGA footprint minimizes trace length, preserving signal integrity at 66 MHz sustained I/O rates required for 500 Mbps imaging throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-15ZXI | 32K × 36, 15 ns, 3.3 V only (no 2.5 V I/O option), 256-ball BGA package | Lacks per-port I/O voltage select and JTAG; requires external arbitration logic for semaphore use | Choose when strict 3.3 V system compatibility is required and JTAG/testability is not needed. |
| AS7C33256P-15TIN | 32K × 36, 15 ns, 3.3 V core/I/O, 208-pin PQFP package, no hardware semaphore or JTAG | Relies on software-managed semaphores; lacks BUSY/INT flags and M/S cascade capability | Choose for cost-sensitive industrial controllers where PCB space permits PQFP and software arbitration is acceptable. |
Compared with CY7C1362BV33-15ZXI and AS7C33256P-15TIN, the 70V657S15BF8 uniquely integrates per-port I/O voltage selection, IEEE 1149.1 JTAG, and hardware semaphore logic - reducing BOM count by eliminating discrete arbitration ICs and enabling mixed-voltage FPGA interfacing without level shifters.
Availability
70V657S15BF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, avionics data concentrators, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and industrial temperature qualification.
Supply support for 70V657S15BF8 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), now part of Renesas Electronics, specializes in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.
The 70V657S15BF8 belongs to IDT's high-speed asynchronous dual-port SRAM family, designed specifically for deterministic inter-processor communication in real-time embedded systems requiring zero-wait-state shared memory.
FAQ
What is the memory organization and address range of the 70V657S15BF8?
The 70V657S15BF8 implements a 32K × 36-bit memory array, meaning it contains 32,768 words of 36 bits each (1.152 Mbit total). Its functional address inputs are A0L–A14L and A0R–A14R (15 bits), supporting 32K addresses per port. A15L/A15R and A16L/A16R are no-connects for this variant, confirming the 32K depth.
Does the 70V657S15BF8 support both 3.3 V and 2.5 V I/O interfaces simultaneously?
Yes - the 70V657S15BF8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VIH configures the left port for 3.3 V I/O (requiring VDDQL = 3.3 V), while OPTR = VIL configures the right port for 2.5 V I/O (requiring VDDQR = 2.5 V). This enables direct interfacing with mixed-voltage FPGAs or SoCs without external level shifters.
How does the BUSY flag function in MASTER vs. SLAVE mode on the 70V657S15BF8?
When M/S = VIH, the 70V657S15BF8 operates as MASTER: BUSYL/BUSYR are totem-pole outputs that assert HIGH when the opposite port initiates a write to an address currently being accessed - blocking conflicting writes. When M/S = VIL, it operates as SLAVE: BUSYL/BUSYR become inputs, allowing an external MASTER to control write arbitration. Both configurations prevent simultaneous writes to the same location.
Can the 70V657S15BF8 be used in JTAG-boundary-scan testing environments?
Yes - the 70V657S15BF8 includes full IEEE 1149.1-compliant JTAG circuitry with dedicated TDI, TDO, TCK, TMS, and TRST pins. This enables board-level interconnect testing, in-system programming verification, and visibility into internal signal states during production test - critical for high-reliability telecom and aerospace assemblies.
What power-saving modes does the 70V657S15BF8 support, and what are their typical current draws?
The 70V657S15BF8 offers four standby modes: ISB1 (both ports deselected, 75 mA max), ISB2 (one port active, 175 mA max), ISB3 (full CMOS standby, 15 mA max), and ISB4 (one port CMOS-standby, 170 mA max). ISB3 is optimal for deep sleep in battery-backed systems, drawing as little as 3 mA typical at 25°C - confirmed in Table 10 of the datasheet.
70V657S15BF8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 208-LFBGA
- Packaging:
- Tape & Reel (TR)
- 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:
- 208-CABGA (15x15)
70V657S15BF8 FAQ
1.How can I place an order for 70V657S15BF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V657S15BF8 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 70V657S15BF8 reliable?
The price and inventory of 70V657S15BF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V657S15BF8 is usually 5 days.
3.What payment methods are accepted for 70V657S15BF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V657S15BF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V657S15BF8?
70V657S15BF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V657S15BF8 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 70V657S15BF8?
For technical support, including 70V657S15BF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V657S15BF8 requirements.
6.How does Aetrix verify that 70V657S15BF8 is sourced from the original manufacturer or authorized distributors?
All 70V657S15BF8 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 70V657S15BF8 meets industry standards.
7.What is the process for return or replacement of 70V657S15BF8?
All 70V657S15BF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V657S15BF8, 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 70V657S15BF8 part is unused and in its original packaging.
Return procedure for 70V657S15BF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V657S15BF8 Tags
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