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Renesas 71256SA25PZGI8
- Part No.:
- 71256SA25PZGI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
71256SA25PZGI8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,955
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Product details
Overview
71256SA25PZGI8 from Renesas Electronics is a 262,144-bit (32K × 8) high-speed CMOS static RAM with industrial temperature range (–40°C to +85°C), 25 ns read/write cycle time, TTL-compatible I/O, and single 5 V supply operation. It serves as a non-refreshing, asynchronous memory buffer in real-time control subsystems requiring deterministic access latency.
For engineers reviewing the 71256SA25PZGI8 datasheet, 71256SA25PZGI8 pinout, 71256SA25PZGI8 application, or 71256SA25PZGI8 equivalent, key selection criteria include industrial-grade timing consistency, low standby current (ISB1 = 15 mA), TSOP-28 package compatibility, and direct replacement feasibility for legacy IDT71256SA-based designs.
Technical Context
This device implements fully static asynchronous circuitry-no clocks or refresh cycles required-and uses dual-control enable logic (CS + OE) to manage output state transitions with sub-11 ns disable timing (tOHZ ≤ 10 ns). Its bidirectional I/O architecture supports byte-wide data transfer without external transceivers.
The 71256SA25PZGI8 operates across VCC = 4.5 V to 5.5 V with guaranteed VIH ≥ 2.2 V and VIL ≤ 0.8 V, enabling robust interfacing with 5 V TTL and CMOS logic families. Standby power management includes two distinct low-current modes: ISB = 40 mA (TTL-level CS deassertion) and ISB1 = 15 mA (CMOS-level CS deassertion).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits), fixed byte-wide interface |
| Access Time (tAA) | 25 ns maximum - guarantees deterministic read latency under worst-case industrial temp/voltage |
| Read Cycle Time (tRC) | 25 ns - enables sustained 40 MHz burst read throughput without wait states |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and tolerant of ±10% regulation variance |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V, CMOS-level CS - reduces system idle power in battery-backed controllers |
| I/O Capacitance | CI/O = 7 pF - minimizes signal integrity impact on high-speed address/data buses |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation, motor drives, and outdoor embedded systems |
Pinout & Package
71256SA25PZGI8 is housed in a 28-pin TSOP Type I (PZG28) package, 8.1 mm × 13.4 mm body, 0.5 mm lead pitch, JEDEC MO-153 compliant. Pinout validated per Renesas datasheet Figure 2a (TSOP top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit row/column decoder inputs; support full 32K address space with no external decoding |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; internally managed direction control via CS/OE/WE logic |
| CS | Chip Select | Primary enable; device enters low-power standby when high (ISB1 mode) or TTL-high (ISB mode) |
| OE | Output Enable | Controls output drivers only; allows read data gating without disabling chip (tOE ≤ 11 ns) |
| WE | Write Enable | Active-low write strobe; initiates write cycle when CS = L; tWP ≥ 20 ns minimum pulse width |
| VCC | Power Supply | +5 V core supply; decoupling required within 10 mm of pin per high-speed RAM layout guidelines |
| GND | Ground Reference | Dedicated ground pin (Pin 16); must be connected to low-impedance plane to maintain noise margin |
Key Features
| Feature | Design Value |
|---|---|
| Industrial temperature grade | –40°C to +85°C operation verified per Renesas qualification standards - suitable for factory-floor PLC modules |
| Low ISB1 standby current | 15 mA max at VCC = 5.5 V - extends hold-up time in capacitor-backed SRAM applications |
| TTL-compatible I/O | VOH ≥ 2.4 V / VOL ≤ 0.4 V at IOH = –4 mA / IOL = 8 mA - interoperable with legacy 74LS/ALS logic without level shifters |
| No refresh or clock required | Fully static CMOS design - eliminates timing-critical refresh overhead in real-time firmware |
| TSOP-28 green packaging | Halogen-free, RoHS-compliant PZG28 package - meets IPC-J-STD-609A marking and material requirements |
Applications
| Industrial PLC Data Buffer | Medical Imaging Frame Store |
|---|---|
|
Use Scenario: Real-time I/O scan buffering in DIN-rail mounted programmable logic controllers operating in ambient temperatures up to +70°C cabinet environments. IC Role / Device Role / Timing Role: Non-volatile data latch for input/output image tables; provides deterministic 25 ns access during cyclic scan execution. Use Value: Eliminates need for external bus arbitration or wait-state insertion, reducing ladder logic scan jitter below 1 µs. |
Use Scenario: Temporary frame storage in portable ultrasound devices requiring rapid pixel data capture between ADC bursts and DSP processing. IC Role / Device Role / Timing Role: High-bandwidth pixel buffer supporting 10-bit grayscale line capture at 20 MSPS without FIFO overflow. Use Value: 25 ns tRC enables continuous 40 MB/s read/write throughput, matching 12-bit parallel ADC output rates. |
| Avionics Sensor Interface Module | Railway Signaling Controller |
|
Use Scenario: Interfacing inertial measurement units (IMUs) to flight control computers in certified airborne equipment with DO-254 compliance requirements. IC Role / Device Role / Timing Role: Deterministic scratchpad memory for sensor fusion algorithms; accessed synchronously with 1 kHz attitude update interrupts. Use Value: Industrial temp rating and 15 mA ISB1 ensure reliable operation during cold-soak (-40°C) and thermal cycling tests per RTCA/DO-160 Section 22. |
Use Scenario: Vital logic state retention in European Train Control System (ETCS) Level 1 balise readers deployed along rail corridors with wide ambient swings. IC Role / Device Role / Timing Role: Fail-safe memory for beacon message parsing and checksum validation; retains last valid packet during brief power interruptions. Use Value: Low ISB1 current and guaranteed tPD ≤ 25 ns allow seamless switchover to backup supercapacitor supply without data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZSXIT | 32K × 8, 45 ns access, 3.3 V core (with 5 V tolerant I/O), SOIC-28 package | Requires level translation for pure 5 V systems; lower power but slower timing | Select if migrating to 3.3 V domain or prioritizing ultra-low ISB (< 1 µA) |
| AS6C4008-25ZIN | 32K × 8, 25 ns access, 5 V operation, industrial temp, SOP-28 (not TSOP) | Same speed/temp but different footprint; requires PCB redesign for pad layout | Select if TSOP-28 assembly capability is unavailable and SOP-28 reflow is preferred |
Compared with CY62128EV30LL-45ZSXIT and AS6C4008-25ZIN, the 71256SA25PZGI8 uniquely delivers 25 ns performance in industrial-grade TSOP-28 at 5 V while maintaining pinout compatibility with legacy IDT71256SA designs-enabling drop-in replacement where board space and thermal profile constrain alternatives.
Availability
71256SA25PZGI8 is available at Aetrix Electronics and suitable for industrial PLCs, medical imaging subsystems, avionics sensor interfaces, and railway signaling controllers requiring stable component supply across extended product lifecycles.
Supply support for 71256SA25PZGI8 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 microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT applications.
The 71256SA25PZGI8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for deterministic, low-latency memory interfacing in mission-critical industrial and transportation control systems.
FAQ
What is the operating voltage range for the 71256SA25PZGI8?
The 71256SA25PZGI8 operates over a supply voltage range of 4.5 V to 5.5 V, with DC specifications guaranteed across this window at both extremes. This ensures compatibility with standard 5 V regulator outputs and accommodates typical ±10% tolerance in industrial power supplies without derating.
Does the 71256SA25PZGI8 require a clock or refresh signal?
No, the 71256SA25PZGI8 uses fully static CMOS circuitry and requires neither a clock nor periodic refresh cycles. Its asynchronous design allows immediate read/write access upon address and control signal stabilization, making it ideal for real-time firmware with strict timing predictability requirements.
What is the meaning of "PZGI8" in the part number 71256SA25PZGI8?
In 71256SA25PZGI8, "PZG" denotes TSOP Type I package (PZG28), "I" indicates industrial temperature grade (–40°C to +85°C), and "8" specifies tape-and-reel packaging format. The full designation confirms the device is a 25 ns industrial-grade TSOP-28 SRAM supplied in reel format.
How does the 71256SA25PZGI8 handle output disable timing?
The 71256SA25PZGI8 supports two independent output disable paths: tOHZ ≤ 10 ns (address change → high-Z) and tCHZ ≤ 11 ns (CS high → high-Z). These values are measured under industrial conditions and ensure clean bus release before subsequent device selection, preventing data contention in shared-memory systems.
Is the 71256SA25PZGI8 RoHS-compliant and halogen-free?
Yes, the 71256SA25PZGI8 is a green-part device per Renesas ordering information, meeting RoHS Directive 2011/65/EU and IPC-J-STD-609A for halogen-free materials. The TSOP-28 (PZG28) package contains no brominated flame retardants or chlorine-based compounds.
71256SA25PZGI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm 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:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
71256SA25PZGI8 FAQ
1.How can I place an order for 71256SA25PZGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA25PZGI8 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 71256SA25PZGI8 reliable?
The price and inventory of 71256SA25PZGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA25PZGI8 is usually 5 days.
3.What payment methods are accepted for 71256SA25PZGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA25PZGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA25PZGI8?
71256SA25PZGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA25PZGI8 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 71256SA25PZGI8?
For technical support, including 71256SA25PZGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA25PZGI8 requirements.
6.How does Aetrix verify that 71256SA25PZGI8 is sourced from the original manufacturer or authorized distributors?
All 71256SA25PZGI8 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 71256SA25PZGI8 meets industry standards.
7.What is the process for return or replacement of 71256SA25PZGI8?
All 71256SA25PZGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA25PZGI8, 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 71256SA25PZGI8 part is unused and in its original packaging.
Return procedure for 71256SA25PZGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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