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Renesas 70V639S12PRF8
- Part No.:
- 70V639S12PRF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 128-LQFP
- Datasheet:
-
70V639S12PRF8.pdf
- Description:
- IC SRAM 2.25MBIT PAR 128TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
IDT70V639S12PRF8 from Integrated Device Technology is a high-speed 128K × 18 asynchronous dual-port static RAM with fully independent left/right ports, 12 ns maximum access time (commercial & industrial grades), LVTTL-compatible 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port via OPTL/OPTR pins. It enables simultaneous read/write to the same memory location in real-time inter-processor communication systems.
For engineers reviewing the IDT70V639S12PRF8 datasheet, IDT70V639S12PRF8 pinout, IDT70V639S12PRF8 application, or IDT70V639S12PRF8 equivalent, key selection considerations include true dual-port arbitration logic, on-chip semaphore signaling, BUSY flag behavior in Master/Slave configuration, and 128-pin TQFP package compatibility with depth expansion using CE0/CE1 enables.
Technical Context
The IDT70V639S12PRF8 implements true dual-port SRAM cells with separate address, control, and data buses for left (L) and right (R) ports - enabling fully asynchronous, concurrent access without external arbitration logic. Its on-chip arbitration supports both address-match and chip-enable-driven BUSY assertion with tBAA ≤ 12 ns and tBDD ≤ 12 ns.
It integrates dedicated semaphore registers (A0–A2 addressed, 8 flags) accessible via SEM pin-controlled mode, plus interrupt flag generation at fixed addresses (1FFFEh/1FFFFh). JTAG IEEE 1149.1 support is excluded in the PK128 TQFP package due to pin count limitation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 128K × 18 bits (2,304 Kbit total); supports 36-bit+ bus expansion via Master/Slave cascading |
| Access Time | 12 ns max (commercial & industrial temperature range); defines minimum cycle time for reliable read/write |
| 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) |
| Operating Temperature | –40°C to +85°C (industrial grade); validated for embedded control and telecom infrastructure |
| Package | 128-pin TQFP (PK128); 14 mm × 20 mm body, 0.5 mm lead pitch, RoHS-compliant green variant available |
| Power Consumption | ISB3 = 3–15 mA (full standby, CMOS inputs); IDD = 300–440 mA (dynamic, both ports active at fMAX) |
| Arbitration Logic | Hardware-supported port-to-port arbitration with BUSY output (Master) / input (Slave) and M/S pin control |
Pinout & Package
Package: 128-pin Thin Quad Flatpack (PK128), 14 mm × 20 mm × 1.4 mm body, 0.5 mm lead pitch, lead finish SnPb (EOL as of June 2018).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A16L / A0R–A16R | Address Inputs (Left/Right) | 17-bit address bus per port; selects one of 128K locations independently |
| I/O0L–I/O17L / I/O0R–I/O17R | Bidirectional Data I/O (Left/Right) | 18-bit parallel data path per port; supports byte-level access via UBL/LBL and UBR/LBR |
| CE0L, CE1L / CE0R, CE1R | Chip Enable Inputs (Left/Right) | Dual enables allow depth expansion without external logic; CE0=VIL & CE1=VIH activates port |
| R/WL / R/WR | Read/Write Control (Left/Right) | Active-low; controls direction of data flow on respective I/O bus during enabled cycles |
| OEL / OER | Output Enable (Left/Right) | Tri-states I/O outputs when high; required for read operations and bus sharing |
| UBL, LBL / UBR, LBR | Upper/Lower Byte Select (Left/Right) | Enables 9-bit byte access (I/O0–I/O8 or I/O9–I/O17); supports multiplexed bus matching |
| SEML / SEMR | Semaphore Enable (Left/Right) | Activates semaphore register access mode (A0–A2 address space) when asserted low |
| INTL / INTR | Interrupt Flag Output (Left/Right) | Open-drain (non-tri-state totem-pole) flag set/cleared by write to 1FFFEh/1FFFFh addresses |
| BUSYL / BUSYR | Busy Flag (Left/Right) | Master: output indicating port contention; Slave: input used to stall writes during arbitration |
| M/S | Master/Slave Select | M/S = VIH configures device as Master (BUSY output); M/S = VIL configures as Slave (BUSY input) |
| OPTL / OPTR | I/O Voltage Option (Left/Right) | VIH → 3.3 V I/O levels; VIL → 2.5 V I/O levels; sets VDDQL/VDDQR supply requirement |
| VDD, VDDQL, VDDQR | Power Supplies | VDD = 3.3 V core; VDDQL/VDDQR = 3.3 V or 2.5 V I/O supplies, determined by OPTL/OPTR state |
| VSS | Ground | All VSS pins must be connected to common system ground; multiple pins reduce impedance |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent read/write to identical memory locations - critical for lock-free inter-processor communication |
| On-Chip Semaphore Logic | Eight hardware semaphore flags accessible via A0–A2; eliminates need for external semaphores or software polling |
| Configurable I/O Voltage | Independent 3.3 V/2.5 V I/O operation per port via OPTL/OPTR pins - simplifies interfacing with mixed-voltage systems |
| Master/Slave Cascading | Supports >36-bit word widths using M/S pin; enables full-speed expansion without discrete glue logic or timing penalties |
| Hardware Arbitration | Automatic BUSY assertion on address or CE contention; tAPS = 5 ns ensures deterministic priority resolution |
| Low-Power Standby Modes | ISB3 = 3–15 mA full standby (CMOS inputs); automatic power-down triggered by CE0/CE1 deassertion per port |
Applications
| Real-Time Inter-Processor Communication | Telecom Line Card Buffering |
|---|---|
|
Use Scenario: Two DSPs exchange status, control, and payload data in hard real-time systems with no shared clock domain. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency shared memory buffer; BUSY arbitration prevents write collisions during concurrent access. Use Value: Eliminates software locks and polling overhead; 12 ns access enables sub-microsecond inter-core messaging latency. |
Use Scenario: High-density telecom line cards require bidirectional packet buffering between framer and switch fabric ASICs. IC Role / Device Role / Timing Role: IDT70V639S12PRF8 serves as asymmetric FIFO buffer - one port handles ingress, the other egress, with independent timing. Use Value: Independent CE/R/W control per port allows burst-mode ingress and streaming egress without stalling either side. |
| Industrial PLC Memory Coherency | Avionics Sensor Fusion Hub |
|
Use Scenario: Programmable logic controller uses dual CPUs (control + safety monitor) requiring synchronized access to shared process variables. IC Role / Device Role / Timing Role: Acts as coherent memory mirror; semaphore flags coordinate safe variable updates between redundant cores. Use Value: Hardware semaphore reduces update latency to <8 ns (tSOP), meeting SIL-3 determinism requirements. |
Use Scenario: Flight control system aggregates inertial, GPS, and air data sensor streams into a centralized fusion engine running on dual ARM cores. IC Role / Device Role / Timing Role: Provides low-jitter, deterministic memory interface between sensor interface ASIC and fusion processor - both operating at different clock domains. Use Value: 12 ns access + tWDD ≤ 25 ns port-to-port write delay ensures sensor timestamp coherency within 30 ns tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY7C1365KV18 | 128K × 18, 10 ns access, 1.8 V core + 1.5/1.8 V I/O; no M/S pin or built-in semaphore logic | Lacks hardware semaphore and Master/Slave cascading; requires external arbitration for multi-device systems | Preferred for ultra-low-power, single-device designs where 1.8 V core compliance is mandatory |
| Renesas R1EX24016AS | 128K × 16, 15 ns access, 3.3 V only, no byte-select or semaphore; supports JTAG in 128-pin TQFP | 16-bit width limits 36-bit expansion; no UBL/LBL or SEM pins - requires external byte masking logic | Selected when JTAG debug visibility is required and 18-bit width is not essential |
Compared with CY7C1365KV18 and R1EX24016AS, the IDT70V639S12PRF8 uniquely delivers integrated semaphore, Master/Slave expansion, and per-port I/O voltage flexibility - making it optimal for deterministic multi-CPU systems where hardware-coordinated memory access is non-negotiable.
Availability
IDT70V639S12PRF8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, telecom line card buffering, and industrial PLC memory coherency requiring stable component supply across extended product lifecycles.
Supply support for IDT70V639S12PRF8 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 real-time interconnect solutions.
The IDT70V639S product line was engineered for deterministic, low-latency memory sharing in dual-CPU and multi-ASIC systems - targeting telecom infrastructure, industrial automation, and avionics where hardware arbitration and semaphore support are critical.
FAQ
What is the maximum operating temperature range supported by the IDT70V639S12PRF8?
The IDT70V639S12PRF8 is qualified for industrial temperature operation from –40°C to +85°C. This rating is explicitly confirmed in the "Recommended Operating Temperature and Supply Voltage" table (page 7) and applies to all speed grades including the "S12" variant denoted in the part number IDT70V639S12PRF8.
Does the IDT70V639S12PRF8 support JTAG boundary-scan testing?
No, JTAG is not supported on the IDT70V639S12PRF8. The datasheet explicitly states: "Due to limited pin count, JTAG is not supported on the 128-pin TQFP package" (page 1, Features section), and this applies directly to the PK128 package used in IDT70V639S12PRF8.
How does the M/S pin affect BUSY signal behavior in the IDT70V639S12PRF8?
When M/S = VIH, the IDT70V639S12PRF8 operates as a Master and drives BUSYL/BUSYR as outputs to indicate port contention. When M/S = VIL, it operates as a Slave and accepts BUSYL/BUSYR as inputs to stall writes - a behavior confirmed in Note 1 on page 2 and AC timing tables (page 14).
Can the left and right ports of the IDT70V639S12PRF8 operate at different I/O voltages simultaneously?
Yes. OPTL and OPTR are independent; setting OPTL = VIH and OPTR = VIL configures the left port for 3.3 V I/O levels (requiring VDDQL = 3.3 V) and the right port for 2.5 V I/O levels (requiring VDDQR = 2.5 V), as defined in Pin Names table (page 5) and DC operating conditions (pages 7–8).
What is the function of the semaphore enable (SEML/SEMR) pins on the IDT70V639S12PRF8?
SEML/SEMR activate semaphore register access mode: when SEMX = VIL, the device interprets A0–A2 as semaphore flag addresses (0–7), and I/O0 carries the flag value while I/O1–I/O17 reflect it - enabling atomic flag exchange without CPU intervention, per Truth Table II (page 6).
70V639S12PRF8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 128-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 2.25Mbit
- Memory Organization:
- 128K x 18
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 12ns
- Access Time:
- 12 ns
- Voltage - Supply:
- 3.15V ~ 3.45V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 128-TQFP (14x20)
70V639S12PRF8 FAQ
1.How can I place an order for 70V639S12PRF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V639S12PRF8 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 70V639S12PRF8 reliable?
The price and inventory of 70V639S12PRF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V639S12PRF8 is usually 5 days.
3.What payment methods are accepted for 70V639S12PRF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V639S12PRF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V639S12PRF8?
70V639S12PRF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V639S12PRF8 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 70V639S12PRF8?
For technical support, including 70V639S12PRF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V639S12PRF8 requirements.
6.How does Aetrix verify that 70V639S12PRF8 is sourced from the original manufacturer or authorized distributors?
All 70V639S12PRF8 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 70V639S12PRF8 meets industry standards.
7.What is the process for return or replacement of 70V639S12PRF8?
All 70V639S12PRF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V639S12PRF8, 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 70V639S12PRF8 part is unused and in its original packaging.
Return procedure for 70V639S12PRF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V639S12PRF8 Tags
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M24C02-WMN6TP
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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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93LC46BT-I/OT
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AT24C04C-SSHM-T
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