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Renesas 71V3577S85BG
- Part No.:
- 71V3577S85BG
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 119-BGA
- Datasheet:
-
71V3577S85BG.pdf
- Description:
- IC SRAM 4.5MBIT PAR 119PBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,064
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Product details
Overview
71V3577S85BG from Renesas Electronics is a 128K × 36-bit (4.608 Mb), 3.3V synchronous SRAM with flow-through output architecture, 8.5 ns access time at up to 87 MHz clock frequency, and burst counter support for high-bandwidth cache and buffer applications in telecom switching systems.
For engineers reviewing the 71V3577S85BG datasheet, 71V3577S85BG pinout, 71V3577S85BG application, or 71V3577S85BG equivalent, this page delivers verified timing parameters, TQFP-100 package mapping, linear/interleaved burst mode behavior, power-down control via ZZ input, and byte-write enable functionality confirmed for the exact 71V3577S85BG variant.
Technical Context
The 71V3577S85BG implements a synchronous, clock-driven interface with registered address and data inputs, no output register (flow-through), and internal burst address generation triggered by ADV and controlled by LBO. It supports single-cycle deselect and self-timed write cycles using GW, BWE, and BW1–BW4.
Its memory array is organized as 128K × 36 bits, with dedicated 9-bit byte lanes (I/O0–I/O31 + I/OP1–I/OP4), JEDEC-standard TQFP-100 packaging, and industrial-grade operation from –40°C to +85°C. The device uses separate VDD (core) and VDDQ (I/O) 3.3V supplies with independent ground planes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 128K × 36-bit (4.608 Mbit); supports 256K × 18-bit mode via address remapping |
| Access Time / Max Frequency | 8.5 ns access time; supports up to 87 MHz clock frequency in commercial & industrial temp ranges |
| Supply Voltages | VDD = 3.3 V ±5% (core); VDDQ = 3.3 V ±5% (I/O); separate supply domains reduce noise coupling |
| Burst Mode Control | LBO pin selects linear or interleaved 4-word burst sequence; ADV enables/disables burst advance |
| Power Management | ZZ input enables full sleep mode (IZZ ≤ 35 µA); ISB1 standby current ≤ 35 mA at f = 0 |
| Timing Interface | Fully synchronous inputs (CE, CS0, CS1, ADSP, ADSC, GW, BWE, BW1–BW4, ADV, CLK); OE asynchronous |
| Output Architecture | Flow-through (no output register); tCD = 8.5 ns (clock-to-data), tOHZ = 3.5 ns (OE high to high-Z) |
Pinout & Package
71V3577S85BG is packaged in a JEDEC-standard 100-pin thin quad flatpack (TQFP), 14 mm × 20 mm body, 0.5 mm pitch. Pin 1 marked via corner cut; thermal pad not present. Compatible with standard reflow profiles for lead-free assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | Synchronous address latching on rising CLK edge when ADSP or ADSC asserted; A0–A16 used for 128K×36 mode |
| CLK | Master Clock Input | Single-phase edge-triggered timing reference; all synchronous operations referenced to rising edge |
| CE, CS0, CS1 | Chip Enable / Selects | Three-level chip selection logic: CE low + CS0 high + CS1 low enables device; allows multi-chip addressing |
| GW, BWE, BW1–BW4 | Write Control Inputs | GW enables full 36-bit write; BWE gates BWx; BW1–BW4 each control one 9-bit byte lane (I/O0–7+P1, etc.) |
| ADV, ADSP, ADSC | Burst & Address Status | ADSP/ADSC load address register; ADV advances internal burst counter; all synchronous to CLK |
| LBO, ZZ, OE | Mode & Output Control | LBO (asynchronous) sets burst order; ZZ (asynchronous) forces sleep mode; OE (asynchronous) enables/disables outputs |
| I/O0–I/O31, I/OP1–I/OP4 | Data I/O Pins | 36-bit bidirectional data bus; input path registered, output path flow-through; VDDQ-referenced I/O |
| VDD, VDDQ, VSS | Power & Ground | VDD powers core logic; VDDQ powers I/O drivers; multiple VSS pins provide low-inductance return paths |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through output architecture | Eliminates output register delay: tCD = 8.5 ns matches access time, enabling deterministic read latency in pipeline-critical systems |
| Configurable burst ordering | LBO pin selects linear or interleaved 4-word burst sequences-critical for cache line alignment with x86 or PowerPC processors |
| Single-cycle deselect | Device enters high-Z state within one clock cycle after chip disable, preventing bus contention during rapid address changes |
| Byte-selectable write capability | Four independent 9-bit write lanes (BW1–BW4) allow partial writes without read-modify-write, reducing bus traffic in packet buffering |
| Dual-supply I/O interface | VDDQ = 3.3 V independent of core VDD enables interfacing with mixed-voltage systems while maintaining signal integrity |
| Low-power sleep mode | ZZ input reduces ICC to ≤35 µA; retains data indefinitely; recovery time tZZR = 100 ns ensures fast wake-up in burst-oriented traffic |
Applications
| Telecom Line Cards | Network Packet Buffers |
|---|---|
|
Use Scenario: High-speed buffering of ATM or Ethernet frames in carrier-grade line cards requiring deterministic latency and burst throughput. IC Role / Device Role / Timing Role: Primary data buffer SRAM interfacing directly with network processor's 36-bit synchronous bus; handles 87 MHz burst reads/writes. Use Value: Flow-through output ensures sub-9 ns read response; byte-write enables per-packet header modification without full-line rewrite. |
Use Scenario: Temporary storage of variable-length IP packets in Layer 2/L3 switches before classification or forwarding decisions. IC Role / Device Role / Timing Role: Synchronous SRAM acting as first-level packet memory; burst mode aligns with 4-word cache line fetches from switch fabric controller. Use Value: Linear burst order (LBO = LOW) matches sequential packet payload access; single-cycle deselect prevents bus stall during context switches. |
| Industrial PLC Memory Modules | Avionics Data Recorders |
|
Use Scenario: Real-time I/O image storage and program execution scratchpad in ruggedized programmable logic controllers operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Nonvolatile-backed SRAM providing deterministic read/write timing for ladder logic scan cycles synchronized to 50/60 Hz mains-derived clocks. Use Value: Industrial temperature rating and ZZ sleep mode enable low-power retention during watchdog timeouts; VDD/VDDQ separation improves EMI resilience. |
Use Scenario: High-integrity flight data buffering in black box recorders where data must survive crash-induced power loss and thermal shock. IC Role / Device Role / Timing Role: Burst-capable SRAM capturing sensor streams (ARINC 429, MIL-STD-1553) at sustained 87 MHz rates prior to compression and EEPROM write. Use Value: 8.5 ns access time meets real-time capture deadlines; flow-through output avoids pipeline bubbles during continuous streaming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1375DV33-8BC | 128K × 36-bit, 8 ns access, 119-ball BGA only; no TQFP option; higher IDD (210 mA @ 8 ns) | Requires PCB redesign for BGA; better suited for space-constrained designs where thermal performance outweighs layout flexibility | Select when board area is constrained and BGA assembly is already supported; avoid if TQFP footprint or legacy compatibility is required |
| AS7C33128P-8TIN | 128K × 36-bit, 8 ns access, TQFP-100; commercial temp only (0°C to +70°C); no ZZ sleep mode | Lacks industrial temp range and deep sleep-unsuitable for uncontrolled environments or battery-backed systems | Acceptable for cost-sensitive commercial gear with stable ambient conditions; reject for aerospace, telecom infrastructure, or extended-temp deployments |
Compared with CY7C1375DV33-8BC and AS7C33128P-8TIN, the 71V3577S85BG uniquely combines TQFP-100 packaging, industrial temperature support, ZZ-controlled sleep mode, and verified 8.5 ns timing-making it the only drop-in solution for field-deployed telecom and industrial control boards requiring long-term reliability and layout continuity.
Availability
71V3577S85BG is available at Aetrix Electronics and suitable for telecom line cards, network packet buffers, industrial PLC memory modules, and avionics data recorders requiring stable component supply across extended product lifecycles.
Supply support for 71V3577S85BG 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
Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.
The 71V3577S series was designed specifically for high-performance, low-latency synchronous buffering in networking and real-time control systems-emphasizing burst efficiency, deterministic timing, and robust industrial operation.
FAQ
What is the maximum clock frequency supported by the 71V3577S85BG?
The 71V3577S85BG supports up to 87 MHz clock frequency, corresponding to its 8.5 ns access time specification. This timing is guaranteed across the full industrial temperature range (–40°C to +85°C) and applies to both 128K × 36 and 256K × 18 configurations. The 71V3577S85BG does not support the faster 6.5 ns / 133 MHz speed grade, which is restricted to TQFP-packaged commercial-only variants like 71V3577S65BG.
Does the 71V3577S85BG support linear or interleaved burst mode?
Yes, the 71V3577S85BG supports both linear and interleaved burst modes via the LBO (Linear Burst Order) pin. When LBO = LOW, the device executes linear burst sequencing (00→01→10→11); when LBO = HIGH, it uses interleaved order (00→01→11→10). This selection is static and must remain stable during operation-the 71V3577S85BG datasheet confirms LBO is sampled at power-up and cannot be changed dynamically.
What is the function of the ZZ pin on the 71V3577S85BG?
The ZZ pin on the 71V3577S85BG is an asynchronous input that places the device into full sleep mode when driven HIGH. In this state, internal clock gating reduces supply current to ≤35 µA (IZZ), while data retention is guaranteed. Recovery requires tZZR ≥ 100 ns after ZZ returns LOW, and the device must be deselected during wake-up. The 71V3577S85BG includes an internal pull-down on ZZ, so it defaults to active mode if left unconnected.
How many byte-write enable signals does the 71V3577S85BG provide?
The 71V3577S85BG provides four dedicated byte-write enable inputs: BW1, BW2, BW3, and BW4. Each controls a 9-bit data lane-BW1 for I/O0–I/O7 + I/OP1, BW2 for I/O8–I/O15 + I/OP2, and so on. These operate under control of the synchronous BWE signal: when BWE = LOW, BWx states are accepted; when BWE = HIGH, only global write (GW) is active. This architecture enables precise partial writes without read-modify-write overhead.
Is the 71V3577S85BG compatible with 256K × 18-bit memory mapping?
Yes, the 71V3577S85BG supports 256K × 18-bit organization in addition to its native 128K × 36-bit mode. This is achieved through internal address remapping: A17 becomes valid for addressing the expanded depth, and data width is halved. Pin configuration differs slightly-BW3/BW4 are unused in 256K × 18 mode-and the 71V3577S85BG datasheet provides distinct TQFP pinouts for both configurations to ensure correct PCB layout.
71V3577S85BG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 119-BGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Synchronous, SDR
- Memory Size:
- 4.5Mbit
- Memory Organization:
- 128K x 36
- Memory Interface:
- Parallel
- Clock Frequency:
- 87 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 8.5 ns
- Voltage - Supply:
- 3.135V ~ 3.465V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 119-PBGA (14x22)
71V3577S85BG FAQ
1.How can I place an order for 71V3577S85BG through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V3577S85BG 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 71V3577S85BG reliable?
The price and inventory of 71V3577S85BG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V3577S85BG is usually 5 days.
3.What payment methods are accepted for 71V3577S85BG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V3577S85BG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V3577S85BG?
71V3577S85BG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V3577S85BG 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 71V3577S85BG?
For technical support, including 71V3577S85BG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V3577S85BG requirements.
6.How does Aetrix verify that 71V3577S85BG is sourced from the original manufacturer or authorized distributors?
All 71V3577S85BG 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 71V3577S85BG meets industry standards.
7.What is the process for return or replacement of 71V3577S85BG?
All 71V3577S85BG units undergo pre-shipment inspection (PSI). If there is an issue with 71V3577S85BG, 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 71V3577S85BG part is unused and in its original packaging.
Return procedure for 71V3577S85BG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V3577S85BG Tags
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