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Renesas 71256SA20YGI8
- Part No.:
- 71256SA20YGI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
71256SA20YGI8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:2,732
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Product details
Overview
71256SA20YGI8 from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM operating at 5V, with 20 ns access time, industrial temperature range (–40°C to +85°C), TTL-compatible I/O, and dual enable control (CS/OE). It serves as main or buffer memory in real-time industrial controllers requiring deterministic, no-refresh data retention.
For engineers reviewing the 71256SA20YGI8 datasheet, 71256SA20YGI8 pinout, 71256SA20YGI8 application, or 71256SA20YGI8 equivalent, key selection criteria include industrial-grade timing consistency (tAA = 20 ns, tOE = 10 ns), low standby current (ISB1 = 15 mA), SOJ-28 package compatibility, and direct TTL-level interfacing without level-shifting.
Technical Context
This device implements fully static asynchronous architecture-no clocks or refresh cycles required-enabling seamless integration into legacy microcontroller buses and FPGA-based memory-mapped peripherals. Its dual-enable logic (CS + OE) supports flexible read gating and bus contention management in multi-master systems.
It uses high-reliability CMOS process technology with guaranteed operation across VCC = 4.5–5.5 V and features bidirectional TTL-compatible I/Os (VIH = 2.2 V min, VOL = 0.4 V max), enabling direct connection to 5V microcontrollers and PLDs without interface logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data transfers |
| Access Time (tAA) | 20 ns max; ensures sub-50-MHz bus read latency in synchronous controller interfaces |
| Supply Voltage | 4.5–5.5 V; compatible with standard 5V logic rails and legacy industrial power domains |
| Operating Temperature | –40°C to +85°C; qualified for uncontrolled industrial cabinet environments |
| Standby Current (ISB1) | 15 mA max at CMOS-level chip deselect; enables low-power sleep modes in battery-backed systems |
| I/O Compatibility | TTL-input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive (IOH = –4 mA, IOL = 8 mA); eliminates need for external buffers |
| Package | 28-pin 300-mil Plastic SOJ (PJG28); surface-mount compatible with standard reflow profiles |
Pinout & Package
71256SA20YGI8 is housed in a 28-pin 300-mil Plastic SOJ (PJG28) package with gull-wing leads, designed for automated placement and IR-reflow soldering. Pin 1 is marked by a notch or dot on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus; selects one of 32,768 memory locations (2¹⁵) |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; tri-stated when CS = high or OE = high |
| CS | Chip Select | Active-low enable; places device in standby (ISB1 = 15 mA) when high |
| OE | Output Enable | Active-low read control; enables outputs only when CS = low and OE = low |
| WE | Write Enable | Active-low write control; latches data on falling edge when CS = low |
| VCC | Power Supply | +5V supply input; requires local 0.1 µF ceramic decoupling |
| GND | Ground | Signal and power reference; must be connected to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Fully static operation | No clock, no refresh required-simplifies timing design and reduces system overhead in microcontroller-based systems |
| Dual enable control (CS + OE) | Enables precise output gating during burst reads and prevents bus contention in shared-memory architectures |
| Industrial temperature support | Guaranteed 20 ns access and full functionality from –40°C to +85°C-suitable for factory-floor PLCs and motor drives |
| Low ISB1 standby current | 15 mA max at CMOS-level deselect-reduces power in always-on embedded systems with periodic wake-up |
| TTL-compatible I/O | Direct interface to legacy 5V MCUs (e.g., 8051, PIC18, older ARM7) without level shifters or pull-ups |
Applications
| Industrial PLC Memory Buffer | Legacy MCU Data RAM |
|---|---|
Use Scenario: Real-time I/O scanning and ladder logic execution in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Non-refreshing data RAM for temporary variable storage and register shadowing with deterministic 20 ns access. Use Value: Eliminates DRAM refresh circuitry and guarantees consistent latency under thermal stress in unventilated enclosures. | Use Scenario: External program/data memory expansion for 8-bit microcontrollers with limited on-chip RAM (e.g., Intel 8051 derivatives). IC Role / Device Role / Timing Role: Byte-wide parallel memory mapped at fixed address space, accessed via MOVX instructions. Use Value: Enables full 64 KB address space utilization while maintaining TTL-level compatibility and zero wait-state operation at ≤25 MHz bus clocks. |
| Medical Instrument Data Log | Test Equipment FIFO Buffer |
Use Scenario: High-integrity patient parameter logging in portable ECG or infusion pumps requiring nonvolatile backup support. IC Role / Device Role / Timing Role: Battery-backed SRAM buffer holding last 30 seconds of waveform data prior to flash write. Use Value: 15 mA ISB1 current allows >72-hour hold-up time on coin-cell backup; industrial temp rating ensures reliability during sterilization cycles. | Use Scenario: Acquisition buffer in benchtop oscilloscopes and logic analyzers capturing high-speed digital signals. IC Role / Device Role / Timing Role: First-in-first-out (FIFO) memory stage between sampling ADC and host processor interface. Use Value: 20 ns cycle time supports sustained 50 MS/s write throughput; SOJ package enables compact PCB layout near high-speed analog front-end. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256ELL-70SNXC | Same 32K×8 organization, 70 ns speed grade, SOIC-28 package, 5V-only, ISB = 25 mA (TTL-level) | Slower access limits use in >14 MHz bus systems; higher standby current reduces battery life | Select only if cost sensitivity outweighs timing and power requirements |
| AS6C4008-20ZIN | 32K×8, 20 ns, industrial temp, SOJ-28, 5V, ISB1 = 10 mA (lower than 71256SA20YGI8) | Lower standby current but lacks OE pin-requires external bus transceivers for shared-bus isolation | Prefer when ultra-low standby dominates over board area and signal count constraints |
Compared with CY62256ELL-70SNXC and AS6C4008-20ZIN, the 71256SA20YGI8 uniquely balances industrial-grade 20 ns timing, dual-enable bus control, and proven field reliability in Renesas' long-lifecycle portfolio-making it optimal for safety-critical industrial upgrades where timing predictability and pinout stability are mandatory.
Availability
71256SA20YGI8 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for 71256SA20YGI8 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 Corporation is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications.
The IDT71256SA family-now part of Renesas' legacy memory portfolio-was engineered for high-reliability, no-refresh operation in mission-critical industrial control and instrumentation systems demanding deterministic timing and wide-temperature resilience.
FAQ
What is the maximum guaranteed access time for 71256SA20YGI8?
The 71256SA20YGI8 has a maximum guaranteed address access time (tAA) of 20 ns under industrial temperature conditions (–40°C to +85°C) and VCC = 4.5–5.5 V. This value is production-tested per Renesas datasheet Table 9 and applies to all valid address transitions with CS and OE asserted.
Does 71256SA20YGI8 require a refresh circuit?
No, the 71256SA20YGI8 is a fully static RAM and requires no refresh cycles. Its internal circuitry maintains data indefinitely as long as power is applied and CS remains active-low during access. This eliminates refresh overhead in microcontroller or FPGA designs.
What package type and lead count does 71256SA20YGI8 use?
The 71256SA20YGI8 uses a 28-pin 300-mil Plastic SOJ (Small Outline J-Lead) package, identified by code PJG28. It features gull-wing leads, is RoHS-compliant, and supports standard IR-reflow soldering profiles per JEDEC J-STD-020.
Can 71256SA20YGI8 operate with a 3.3V supply?
No, the 71256SA20YGI8 is specified only for 4.5–5.5 V operation. Its TTL-compatible inputs require VIH ≥ 2.2 V and VIL ≤ 0.8 V, and its internal logic and output drivers are not characterized for 3.3V. Using 3.3V may result in undefined behavior or data corruption.
What is the standby current consumption of 71256SA20YGI8 in industrial mode?
In CMOS-level standby (ISB1), the 71256SA20YGI8 draws ≤15 mA at VCC = 5.5 V and TA = +85°C-verified across production lots and guaranteed in Renesas datasheet Table 6. This occurs when CS > VHC (≈4.8 V) and all inputs are at valid TTL levels.
71256SA20YGI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20ns
- Access Time:
- 20 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
71256SA20YGI8 FAQ
1.How can I place an order for 71256SA20YGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA20YGI8 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 71256SA20YGI8 reliable?
The price and inventory of 71256SA20YGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA20YGI8 is usually 5 days.
3.What payment methods are accepted for 71256SA20YGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA20YGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA20YGI8?
71256SA20YGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA20YGI8 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 71256SA20YGI8?
For technical support, including 71256SA20YGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA20YGI8 requirements.
6.How does Aetrix verify that 71256SA20YGI8 is sourced from the original manufacturer or authorized distributors?
All 71256SA20YGI8 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 71256SA20YGI8 meets industry standards.
7.What is the process for return or replacement of 71256SA20YGI8?
All 71256SA20YGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA20YGI8, 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 71256SA20YGI8 part is unused and in its original packaging.
Return procedure for 71256SA20YGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71256SA20YGI8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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M24C02-FMC6TG
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