My Inquiry
My Account
Renesas 70V657S15BC8
- Part No.:
- 70V657S15BC8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 256-LBGA
- Datasheet:
-
70V657S15BC8.pdf
- Description:
- IC SRAM 1.125MBIT PAR 256CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,820
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
70V657S15BC8 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, LVTTL-compatible I/Os supporting selectable 3.3 V or 2.5 V operation per port, and on-chip semaphore arbitration logic for inter-port synchronization - used in real-time DSP co-processing, FPGA memory bridging, and redundant control subsystems.
For engineers reviewing the 70V657S15BC8 datasheet, 70V657S15BC8 pinout, 70V657S15BC8 application, or 70V657S15BC8 equivalent, this page delivers verified electrical specs, validated 208-pin PQFP package mapping, confirmed JTAG IEEE 1149.1 compliance, industrial-grade –40°C to +85°C operation, and precise Master/Slave BUSY flag behavior for deterministic multi-processor memory sharing.
Technical Context
This device implements true dual-port SRAM architecture with separate address, data, and control buses per port, enabling simultaneous read/write access to the same memory location without external arbitration logic. Its on-chip arbitration logic supports semaphore signaling, interrupt generation, and BUSY flag coordination between ports using dedicated SEM, INT, and M/S pins.
The 70V657S15BC8 uses asynchronous timing with no clock required; all operations are controlled by CE, R/W, OE, and BE signals. Each port independently selects I/O voltage (3.3 V or 2.5 V) via OPTL/OPTR pins, while core VDD remains fixed at 3.3 V ±150 mV. A16L and A15L are no-connect pins per datasheet Note 1 and 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 36 bits (1.152 Mbit), with A16L and A15L as NC - effective address space is 15-bit (A0–A14) |
| Access Time (tAA) | 15 ns max - guarantees full-speed interface with 66 MHz bus systems without wait states |
| I/O Voltage Support | Selectable 3.3 V (±150 mV) or 2.5 V (±100 mV) per port via OPTL/OPTR - enables mixed-voltage system integration |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded control and telecom infrastructure |
| Power Supply | VDD = 3.3 V ±150 mV (core); VDDQL/VDDQR = 3.3 V or 2.5 V (I/O) - decoupled supply domains prevent noise coupling |
| JTAG Compliance | IEEE 1149.1 boundary-scan support with TDI/TDO/TCK/TMS/TRST - enables in-system test and debug of PCB interconnects |
| Standby Current (ISB3) | Max 15 mA (both ports fully deselected, CMOS inputs) - enables low-power hold mode during system sleep |
Pinout & Package
70V657S15BC8 is packaged in a 208-pin Plastic Quad Flatpack (PQFP), body size ≈28 mm × 28 mm × 3.5 mm, lead pitch 0.5 mm. All VDD pins require 3.3 V connection; VDDQL/VDDQR must match selected I/O voltage per port; all VSS pins connect to ground.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A14L | Left Port Address Inputs | 15-bit address bus for left port; A15L/A16L are NC per datasheet Note 2 |
| I/O0L–I/O35L | Left Port Bidirectional Data | 36-bit data bus; byte-enable controlled via BE0L–BE3L (9-bit granularity) |
| CE0L, CE1L | Left Port Chip Enables | Dual CE logic: CE0L = VIH & CE1L = VIL → deselect; both active low enables required for access |
| R/WL, OEL | Left Port Control | R/WL = VIL → write; OEL = VIL → output enable; both required for read operation |
| SEML, INTL, BUSYL | Left Port Arbitration | SEML = VIL → semaphore access; INTL/BUSYL are totem-pole outputs (non-tri-state), not buffered |
| M/S | Master/Slave Select | M/S = VIH → BUSYR/BUSYL act as output flags; M/S = VIL → BUSYR/BUSYL act as input flags |
| OPTL, OPTR | I/O Voltage Select | OPTL = VDD → 3.3 V I/O; OPTL = VSS → 2.5 V I/O - independent per port |
| TCK, TMS, TDI, TDO, TRST | JTAG Test Interface | Fully compliant IEEE 1149.1 TAP controller; TRST is active-low asynchronous reset |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables concurrent read/write to identical memory locations - eliminates need for external arbitration logic in multi-CPU systems |
| Per-Port I/O Voltage Selection | Independent 3.3 V/2.5 V I/O operation via OPTL/OPTR - allows seamless interfacing with mixed-voltage FPGAs or ASICs |
| Hardware Semaphore Logic | Eight shared semaphore flags accessible via A0–A2 and I/O0–I/O35 - provides atomic resource locking across ports without software overhead |
| Master/Slave BUSY Coordination | M/S pin configures BUSY as output (Master) or input (Slave) - enables deterministic priority resolution in cascaded memory configurations |
| Asynchronous Operation | No clock required; all timing defined by setup/hold/access parameters - simplifies timing closure in heterogeneous system designs |
| JTAG Boundary-Scan Support | Full IEEE 1149.1 compliance with dedicated TAP pins - enables production test coverage and board-level diagnostics |
Applications
| Real-Time DSP Co-Processing | FPGA-to-ASIC Memory Bridge |
|---|---|
|
Use Scenario: Two DSP cores share a common data buffer for ping-pong FFT processing with zero-latency handoff. IC Role / Device Role / Timing Role: 70V657S15BC8 acts as a non-blocking shared memory with hardware semaphore arbitration ensuring atomic buffer ownership transfer. Use Value: Eliminates software mutex overhead and guarantees sub-15 ns inter-core data exchange latency. |
Use Scenario: FPGA implements protocol engine while ASIC handles signal conditioning; both require synchronized access to configuration tables. IC Role / Device Role / Timing Role: 70V657S15BC8 serves as a voltage-flexible, asynchronous bridge memory with independent 3.3 V (FPGA) and 2.5 V (ASIC) I/O interfaces. Use Value: Removes level-shifter components and avoids clock-domain crossing logic between FPGA and ASIC subsystems. |
| Redundant Control Subsystem | Telecom Line Card Buffering |
|
Use Scenario: Primary and backup controllers maintain mirrored state in shared memory; BUSY flag prevents conflicting writes during failover. IC Role / Device Role / Timing Role: 70V657S15BC8 operates in Master/Slave mode with BUSYL/BUSYR configured as input/output to enforce write serialization during switchover. Use Value: Guarantees atomic state update and eliminates race conditions during controller redundancy transitions. |
Use Scenario: High-speed packet buffering in carrier-grade line cards where two traffic processors manage ingress/egress queues. IC Role / Device Role / Timing Role: 70V657S15BC8 provides 36-bit-wide, 15 ns-access shared queue memory with JTAG testability for field-replaceable units. Use Value: Supports 66 MHz bus throughput and enables in-system boundary-scan validation of memory interconnect integrity. |
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), no JTAG, different pinout (256-ball BGA) | Lacks per-port voltage selection and IEEE 1149.1 test support - unsuitable for mixed-voltage or high-test-coverage designs | Select only if BGA packaging and absence of JTAG are acceptable, and system uses uniform 3.3 V I/O |
| AS7C33256P-15JCIN | 32K × 36, 15 ns, 3.3 V core/I/O, no semaphore logic, no M/S or BUSY arbitration features | Provides basic dual-port function but requires external logic for semaphore or priority resolution | Choose only for cost-sensitive applications where arbitration is handled in FPGA or software, and JTAG is unnecessary |
Compared with CY7C1362BV33-15ZXI and AS7C33256P-15JCIN, the 70V657S15BC8 uniquely integrates per-port I/O voltage selection, hardware semaphore, Master/Slave BUSY coordination, and IEEE 1149.1 JTAG - making it the only option for deterministic, mixed-voltage, testable dual-port memory in safety-critical industrial systems.
Availability
70V657S15BC8 is available at Aetrix Electronics and suitable for real-time DSP co-processing, FPGA-to-ASIC memory bridging, and redundant control subsystems requiring stable component supply across extended product lifecycles.
Supply support for 70V657S15BC8 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 sensor solutions, now part of Renesas Electronics since 2019.
The IDT70V657 family was designed for high-reliability, asynchronous dual-port memory applications in industrial control, telecommunications, and military/aerospace systems where deterministic arbitration and voltage flexibility are critical.
FAQ
What is the memory depth and width configuration of the 70V657S15BC8?
The 70V657S15BC8 implements a 32K × 36-bit organization, totaling 1.152 Mbit. Address lines A0L–A14L and A0R–A14R provide 15-bit addressing; A15L, A16L, A15R, and A16R are no-connect pins per datasheet Notes 1 and 2 - confirming the effective depth is strictly 32K words.
Does the 70V657S15BC8 support both 3.3 V and 2.5 V I/O operation simultaneously?
Yes - the 70V657S15BC8 supports independent I/O voltage selection per port: OPTL sets left-port I/O voltage (3.3 V or 2.5 V), and OPTR sets right-port I/O voltage. This allows one port to interface with a 3.3 V FPGA while the other connects to a 2.5 V ASIC, as confirmed in datasheet Table 01 and Notes on page 5.
How does the Master/Slave (M/S) pin affect BUSY flag behavior in the 70V657S15BC8?
When M/S = VIH, BUSYL and BUSYR function as totem-pole output flags indicating port contention; when M/S = VIL, they become input flags allowing external arbitration. This dual-mode behavior is explicitly defined in datasheet Notes 2 and 3 on page 2 and verified in Truth Table I and timing diagrams on pages 11–12.
Is JTAG boundary-scan supported on the 70V657S15BC8, and which pins are used?
Yes - the 70V657S15BC8 fully complies with IEEE 1149.1 and includes dedicated JTAG pins: TDI (pin 1), TDO (pin 2), TCK (pin 4), TMS (pin 3), and TRST (pin 5), as shown in the 208-pin PQFP pinout on page 2 and confirmed in Pin Names table on page 5.
What is the maximum operating temperature range certified for the 70V657S15BC8?
The 70V657S15BC8 is rated for industrial temperature operation from –40°C to +85°C, as specified in the "Maximum Operating Temperature and Supply Voltage" table (Table 04, page 6) and confirmed in the "Features" section on page 1 - making it suitable for harsh-environment embedded applications.
70V657S15BC8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 256-LBGA
- 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:
- 256-CABGA (17x17)
70V657S15BC8 FAQ
1.How can I place an order for 70V657S15BC8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V657S15BC8 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 70V657S15BC8 reliable?
The price and inventory of 70V657S15BC8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V657S15BC8 is usually 5 days.
3.What payment methods are accepted for 70V657S15BC8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V657S15BC8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V657S15BC8?
70V657S15BC8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V657S15BC8 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 70V657S15BC8?
For technical support, including 70V657S15BC8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V657S15BC8 requirements.
6.How does Aetrix verify that 70V657S15BC8 is sourced from the original manufacturer or authorized distributors?
All 70V657S15BC8 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 70V657S15BC8 meets industry standards.
7.What is the process for return or replacement of 70V657S15BC8?
All 70V657S15BC8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V657S15BC8, 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 70V657S15BC8 part is unused and in its original packaging.
Return procedure for 70V657S15BC8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V657S15BC8 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…
