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Renesas 71256SA25PZGI
- Part No.:
- 71256SA25PZGI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
71256SA25PZGI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,421
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Product details
Overview
71256SA25PZGI from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with industrial temperature range (–40°C to +85°C), 25 ns read/write cycle time, TTL-compatible I/O, single 5 V supply operation, and TSOP-28 package. It serves as nonvolatile cache or buffer memory in real-time control systems requiring deterministic access without refresh.
For engineers reviewing the 71256SA25PZGI datasheet, 71256SA25PZGI pinout, 71256SA25PZGI application, or 71256SA25PZGI equivalent, this device supports fast asynchronous read/write cycles with 6 ns output enable delay, low standby current (40 mA at max VCC), and dual chip-select logic for memory banking in legacy industrial controllers and instrumentation.
Technical Context
The 71256SA25PZGI implements fully static asynchronous circuitry-no clocks or refresh required-and uses TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) with bidirectional I/O pins directly interfacing microcontroller data buses. Its control logic decodes CS, OE, and WE independently to enable read, write, and high-impedance states without bus contention.
It features two standby modes: ISB (TTL-level CS deassertion, 40 mA max ICC) and ISB1 (CMOS-level CS deassertion, 15 mA max ICC), enabling power-aware memory management in battery-backed or energy-constrained embedded systems. Address access time (tAA) and cycle time (tRC) are both guaranteed at 25 ns across the full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit array); supports byte-wide parallel data transfer without multiplexing |
| Access/Cycle Time | 25 ns (tAA and tRC); ensures compatibility with 40 MHz bus timing in legacy 8/16-bit microcontrollers |
| Supply Voltage | 4.5 V to 5.5 V; tolerates ±10% regulation drift common in unregulated industrial power rails |
| Operating Temperature | –40°C to +85°C; qualified for use in motor drives, PLCs, and outdoor telemetry hardware |
| Standby Current | 40 mA (ISB) / 15 mA (ISB1); enables low-power sleep modes when memory is deselected |
| I/O Compatibility | TTL-level inputs and outputs; eliminates need for level-shifting logic on 5 V MCU buses |
| Package | 28-pin TSOP Type I (PZG28); 8.1 mm × 13.4 mm footprint compatible with space-constrained PCB layouts |
Pinout & Package
71256SA25PZGI is housed in a 28-pin TSOP Type I (PZG28) package with 0.5 mm pitch, JEDEC MO-153 compliant, and lead-free (Green) construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word decoding; no internal latching - requires stable address during CS low |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; transitions between input (write) and output (read) controlled by OE/WE/CS logic |
| CS | Chip Select | Active-low enable; deassertion places device in ISB or ISB1 standby depending on voltage threshold |
| OE | Output Enable | Active-low control for output drivers; tOE = 11 ns max ensures fast data release after address valid |
| WE | Write Enable | Active-low write strobe; controls data capture timing with tWP = 20 ns minimum pulse width |
| VCC | Power Supply | +5 V supply pin; bypass capacitor recommended within 10 mm due to dynamic ICC up to 145 mA |
| GND | Ground | Signal reference for all I/O and internal logic; separate ground plane recommended for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Static Operation | No clock, no refresh required - simplifies timing design in microcontroller-based systems with irregular memory access patterns |
| Dual Standby Modes | ISB (40 mA) and ISB1 (15 mA) allow trade-off between wake-up latency and power savings based on system response requirements |
| Fast Output Enable | tOE = 11 ns max enables rapid data sampling in burst-read applications such as oscilloscope waveform buffering |
| Industrial Temperature Qualification | Guaranteed 25 ns performance across –40°C to +85°C - validated for deployment in factory automation and transportation electronics |
| Green (RoHS-Compliant) Packaging | Lead-free TSOP construction meets IPC/JEDEC J-STD-020 reflow profiles and environmental compliance mandates |
Applications
| Industrial PLC Memory Buffer | Legacy CNC Controller Cache |
|---|---|
Use Scenario: Storing real-time I/O status and motion command queues in programmable logic controllers operating in dusty, high-vibration environments. IC Role / Device Role / Timing Role: Asynchronous SRAM providing deterministic 25 ns read/write access for ladder logic scan cycles synchronized to 10 ms task intervals. Use Value: Eliminates DRAM refresh overhead and guarantees worst-case latency under thermal stress, ensuring deterministic scan times per IEC 61131-3. |
Use Scenario: Holding G-code segment buffers and axis position lookups in retrofit CNC motion controllers using 80C188 or Z80-based architectures. IC Role / Device Role / Timing Role: Byte-wide memory interface matching native 8-bit data bus width and supporting burst writes during tool-path preloading. Use Value: 25 ns cycle time aligns with 40 MHz bus clocks used in legacy motion ASICs, avoiding wait-state insertion and preserving throughput. |
| Medical Infusion Pump Data Log | Ruggedized Telemetry Transceiver Buffer |
Use Scenario: Capturing time-stamped dosage history and alarm events in battery-powered infusion pumps requiring long-term reliability and low standby draw. IC Role / Device Role / Timing Role: Nonvolatile buffer backed by supercapacitor; retains data during main power loss with ISB1 current ≤15 mA. Use Value: Low ISB1 current extends backup runtime >72 hours, meeting IEC 60601-1 clause 15.3.2 for critical data retention. |
Use Scenario: Temporary storage of sensor payloads before RF transmission in wireless telemetry nodes deployed in oilfield or agricultural monitoring. IC Role / Device Role / Timing Role: High-reliability SRAM interfaced to UART or SPI-to-parallel bridge ICs, operating continuously at +85°C ambient. Use Value: Industrial temp rating and 25 ns access ensure consistent packet assembly timing even under solar-heated enclosure conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256ELL-25ZXI | Same 32K×8 organization, 25 ns speed, but uses SOIC-28 package and has higher ISB (60 mA) | Lacks TSOP footprint; unsuitable for height-constrained designs where PZG28 is specified | Select if board already uses SOIC layout and higher standby current is acceptable |
| AS6C4008-25ZIN | 25 ns speed, industrial temp, but requires 2.7–3.6 V supply - not 5 V compatible | Incompatible with legacy 5 V bus systems; needs level translation or regulator redesign | Choose only for new 3.3 V designs prioritizing ultra-low power over backward compatibility |
Compared with CY62256ELL-25ZXI and AS6C4008-25ZIN, the 71256SA25PZGI uniquely delivers 5 V TTL compatibility, TSOP-28 footprint, and 15 mA ISB1 current - making it the only drop-in replacement for existing industrial boards designed around IDT/Renesas 71256SA family layouts.
Availability
71256SA25PZGI is available at Aetrix Electronics and suitable for industrial PLCs, legacy CNC retrofits, medical infusion pumps, and ruggedized telemetry devices requiring stable component supply across extended product lifecycles.
Supply support for 71256SA25PZGI 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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.
The 71256SA25PZGI belongs to Renesas' legacy high-speed CMOS SRAM product line, engineered for deterministic, low-latency memory interfacing in mission-critical industrial control and instrumentation systems.
FAQ
What is the maximum operating frequency supported by the 71256SA25PZGI?
The 71256SA25PZGI does not operate on a clock signal - it is an asynchronous SRAM. Its 25 ns read/write cycle time corresponds to a maximum effective bus frequency of 40 MHz when used with zero-wait-state controllers. Timing is governed by tRC and tWC parameters, not clock edges, enabling flexible integration with microcontrollers lacking dedicated memory controllers.
Does the 71256SA25PZGI require external refresh circuitry?
No, the 71256SA25PZGI is a fully static RAM and requires no refresh cycles or external refresh circuitry. Its CMOS memory array retains data indefinitely as long as VCC is applied and CS remains asserted during active use. This eliminates timing-critical refresh overhead in real-time systems where deterministic latency is essential.
Can the 71256SA25PZGI be used in place of the 71256SA25PZG (commercial grade)?
Yes, the 71256SA25PZGI is functionally identical to the commercial-grade 71256SA25PZG except for its extended industrial temperature qualification (–40°C to +85°C). Both share identical timing specs, pinout, and electrical characteristics at 25 ns. The 'I' suffix denotes temperature grade only - no layout or firmware changes are needed for migration.
What is the purpose of the ISB1 standby mode in the 71256SA25PZGI?
The ISB1 mode activates when CS is driven above VHC (VCC – 0.2 V), placing the 71256SA25PZGI in ultra-low-power standby with ICC ≤15 mA. This mode is ideal for battery-backed systems where memory must retain data for days or weeks while minimizing drain - distinct from standard ISB (≤40 mA), which triggers at lower CS voltage thresholds.
Is the 71256SA25PZGI RoHS-compliant and lead-free?
Yes, the 71256SA25PZGI is a Green (RoHS-compliant) part with lead-free TSOP packaging, conforming to IPC/JEDEC J-STD-020 reflow standards. The 'G' in the orderable part number explicitly denotes RoHS compliance, and the device meets Renesas' restricted hazardous substance requirements per the June 2020 datasheet revision.
71256SA25PZGI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tube
- 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
71256SA25PZGI FAQ
1.How can I place an order for 71256SA25PZGI through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA25PZGI 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 71256SA25PZGI reliable?
The price and inventory of 71256SA25PZGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA25PZGI is usually 5 days.
3.What payment methods are accepted for 71256SA25PZGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA25PZGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA25PZGI?
71256SA25PZGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA25PZGI 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 71256SA25PZGI?
For technical support, including 71256SA25PZGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA25PZGI requirements.
6.How does Aetrix verify that 71256SA25PZGI is sourced from the original manufacturer or authorized distributors?
All 71256SA25PZGI 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 71256SA25PZGI meets industry standards.
7.What is the process for return or replacement of 71256SA25PZGI?
All 71256SA25PZGI units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA25PZGI, 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 71256SA25PZGI part is unused and in its original packaging.
Return procedure for 71256SA25PZGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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