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Renesas 71256SA20PZG
- Part No.:
- 71256SA20PZG
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
71256SA20PZG.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,591
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Product details
Overview
71256SA20PZG from Renesas Electronics is a 262,144-bit (32K × 8) high-speed CMOS static RAM with 20 ns access time, TTL-compatible I/O, single 5 V supply operation, and industrial-grade temperature support (–40°C to +85°C). It serves as main memory or buffer in embedded controllers, instrumentation, and legacy industrial systems requiring asynchronous, non-refreshed storage.
For engineers reviewing the 71256SA20PZG datasheet, 71256SA20PZG pinout, 71256SA20PZG application, or 71256SA20PZG equivalent, key selection criteria include access/cycle timing symmetry (tAA = tRC = 20 ns), low standby current (ISB1 = 15 mA), TSOP-28 package compatibility, and direct replacement feasibility for legacy IDT/Integrated Device Technology SRAM designs.
Technical Context
The 71256SA20PZG implements fully static asynchronous circuitry-no clocks or refresh required-and uses dual-control enable logic with independent Chip Select (CS) and Output Enable (OE) pins to manage read/write state transitions and output impedance. Its bidirectional I/O architecture supports TTL-level voltage thresholds (VIH = 2.2 V min, VIL = 0.8 V max) and operates across 4.5 V to 5.5 V supply range.
Timing behavior is defined by overlapping control signals: read cycles require CS and OE both low while WE is high; write cycles require CS and WE both low while OE is high. Power management includes two standby modes-TTL-level (ISB = 40 mA) and CMOS-level (ISB1 = 15 mA)-activated by voltage thresholds on CS relative to VHC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits), fixed asynchronous SRAM array |
| Access Time (tAA) | 20 ns max - defines minimum address-to-data-valid delay in read mode |
| Cycle Time (tRC) | 20 ns max - sets minimum interval between successive read or write operations |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V - enables low-power hold state when CS > VHC |
| I/O Compatibility | TTL input thresholds and output drive - interfaces directly with 74LS/74F logic without level shifters |
Pinout & Package
71256SA20PZG is housed in a 28-pin TSOP Type I (PZG28) package, 300-mil width, surface-mount, JEDEC MO-147 compliant. Pin pitch is 0.5 mm; body dimensions are 18.4 mm × 8.0 mm × 1.2 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus selecting one of 32,768 memory locations |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; direction controlled by CS/OE/WE states |
| CS | Chip Select | Primary enable: device active only when low; controls ISB/ISB1 power modes |
| OE | Output Enable | Secondary read control: enables outputs only when low during CS-active window |
| WE | Write Enable | Active-low write strobe; initiates data latching when CS and WE both low |
| VCC | Power Supply | +5 V supply rail; decoupling required per high-speed CMOS layout practice |
| GND | Ground Reference | Signal and power return path; requires low-impedance PCB plane connection |
Key Features
| Feature | Design Value |
|---|---|
| Fully static operation | No clock, no refresh needed - simplifies system timing design and eliminates DRAM controller overhead |
| Equal access and cycle times | tAA = tRC = 20 ns - enables deterministic bus timing and eliminates read/write asymmetry penalties |
| Dual enable control (CS + OE) | Independent output gating allows partial bus sharing and glitch-free multi-device read arbitration |
| Low CMOS-level standby current | ISB1 = 15 mA max - reduces idle power in always-on industrial modules without sacrificing wake latency |
| TTL-compatible I/O | Direct interface with legacy 5 V microcontrollers and FPGAs - avoids external level-shifting components |
Applications
| Industrial PLC Memory Buffer | Legacy Test Equipment Data Storage |
|---|---|
Use Scenario: Storing real-time sensor acquisition buffers and program instruction cache in programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Asynchronous SRAM providing zero-wait-state memory access for 80C188/80C186-based control engines. Use Value: 20 ns access ensures deterministic response to interrupt-driven I/O events under –40°C to +85°C thermal cycling. | Use Scenario: Holding calibration tables and waveform capture snapshots in benchtop oscilloscopes and signal generators with aging 5 V bus architectures. IC Role / Device Role / Timing Role: Non-volatile-buffered SRAM used for fast-access lookup tables during analog-to-digital conversion post-processing. Use Value: TTL-compatible I/O and 28-pin TSOP footprint allow drop-in replacement of obsolete 71256 variants without PCB redesign. |
| Avionics Data Logger Cache | Medical Imaging Frame Buffer |
Use Scenario: Capturing flight parameter telemetry streams in certified airborne data recorders where EMI resilience and thermal stability are critical. IC Role / Device Role / Timing Role: High-reliability SRAM acting as intermediate frame store before compression and non-volatile write-through. Use Value: Industrial temperature rating and 15 mA CMOS standby current support extended battery-backed operation during ground maintenance. | Use Scenario: Temporary storage of digitized X-ray or ultrasound frames in portable diagnostic devices with legacy 8-bit microprocessor subsystems. IC Role / Device Role / Timing Role: Burst-mode SRAM interfacing directly with 8051-family controllers via multiplexed address/data buses. Use Value: Symmetric 20 ns read/write cycle enables full-frame capture at 30 fps without bus contention stalls. |
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 | 45 ns access, 3.3 V core, 5 V tolerant I/O, 28-pin SOIC | Requires level translation for pure 5 V systems; lower power but slower timing | Select when migrating to 3.3 V domains or when board space permits SOIC over TSOP |
| AS6C4008-20ZIN | 20 ns access, 5 V supply, 28-pin TSOP, higher ICC (200 mA dynamic) | Same pinout and timing, but higher active current and different manufacturer qualification | Valid functional alternative for 71256SA20PZG in new builds where Renesas sourcing is constrained |
Compared with CY62128EV30LL-45ZSXIT and AS6C4008-20ZIN, the 71256SA20PZG delivers identical 20 ns timing in a proven industrial-qualified TSOP package with optimized 5 V TTL compatibility and lower dynamic current (145 mA vs. 200 mA), making it preferable for legacy 5 V systems requiring minimal BOM change.
Availability
71256SA20PZG is available at Aetrix Electronics and suitable for industrial automation, avionics data logging, and medical imaging equipment requiring stable component supply across extended lifecycle programs.
Supply support for 71256SA20PZG 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 71256SA series belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for backward-compatible replacement of IDT-era asynchronous memory in mission-critical industrial and instrumentation systems.
FAQ
What is the operating temperature range for the 71256SA20PZG?
The 71256SA20PZG is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Recommended Operating Temperature and Supply Voltage" table and reinforced in the Ordering Information section, where "PZGI" and "PZGI8" variants denote industrial-grade TSOP packaging. The device maintains full AC/DC parametric compliance across this full range without derating.
Does the 71256SA20PZG require a clock or refresh signal?
No, the 71256SA20PZG uses fully static CMOS circuitry and requires no clock, refresh, or periodic access to retain data. This is explicitly stated in the Description section: "Fully static asynchronous circuitry is used, requiring no clocks or refresh for operation." Its operation depends solely on address, CS, OE, and WE timing - ideal for simple microcontroller or FPGA memory interfaces.
What package type does the 71256SA20PZG use, and is it RoHS-compliant?
The 71256SA20PZG uses a 28-pin TSOP Type I (PZG28) package, as confirmed in the Ordering Information table and Pin Configuration diagrams. It is a green (lead-free, halogen-free) device, per the "Green parts available" statement in Features and the "Restricted hazardous substance device" note in the Datasheet Document History (updated 09/30/04 and reaffirmed in 06/29/20 rebranding).
How does the 71256SA20PZG handle output disable and high-impedance states?
The 71256SA20PZG enters high-impedance output state under three conditions: (1) CS high (deselected), (2) CS low but OE high (read disabled), or (3) during write cycles (WE low). Timing parameters tCHZ (0–10 ns), tOHZ (0–8 ns), and tWHZ (0–10 ns) define transition delays into high-Z, ensuring clean bus release for multi-SRAM systems - verified in Truth Table and AC Electrical Characteristics.
Can the 71256SA20PZG be used as a direct replacement for older IDT71256SA-20 versions?
Yes, the 71256SA20PZG is a Renesas-branded continuation of the original IDT71256SA-20, with identical pinout, timing (tAA/tRC = 20 ns), electrical specs, and TSOP-28 packaging. The datasheet rebranding notice (06/29/20) confirms functional equivalence, and the Ordering Information lists PZG as the designated TSOP code - enabling drop-in replacement in existing designs without layout or firmware changes.
71256SA20PZG 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:
- 20ns
- Access Time:
- 20 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
71256SA20PZG FAQ
1.How can I place an order for 71256SA20PZG through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA20PZG 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 71256SA20PZG reliable?
The price and inventory of 71256SA20PZG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA20PZG is usually 5 days.
3.What payment methods are accepted for 71256SA20PZG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA20PZG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA20PZG?
71256SA20PZG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA20PZG 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 71256SA20PZG?
For technical support, including 71256SA20PZG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA20PZG requirements.
6.How does Aetrix verify that 71256SA20PZG is sourced from the original manufacturer or authorized distributors?
All 71256SA20PZG 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 71256SA20PZG meets industry standards.
7.What is the process for return or replacement of 71256SA20PZG?
All 71256SA20PZG units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA20PZG, 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 71256SA20PZG part is unused and in its original packaging.
Return procedure for 71256SA20PZG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71256SA20PZG Tags
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AT24C02C-XHM-T
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