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Renesas 71256SA20PZG8
- Part No.:
- 71256SA20PZG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
71256SA20PZG8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,059
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Product details
Overview
71256SA20PZG8 from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM with 20 ns access time, TTL-compatible I/O, single 5 V supply operation, and industrial-grade temperature range support (–40°C to +85°C). It features separate Chip Select (CS) and Output Enable (OE) pins, bidirectional data bus, and low-power standby modes - deployed in embedded controllers, industrial PLCs, and legacy instrumentation requiring deterministic asynchronous memory access.
For engineers reviewing the 71256SA20PZG8 datasheet, 71256SA20PZG8 pinout, 71256SA20PZG8 application, or 71256SA20PZG8 equivalent, key selection criteria include verified 20 ns tAA/tRC timing under industrial temperature, TSOP-28 package compatibility, CS/OE dual-control read/write flexibility, and ISB1 standby current ≤15 mA at CMOS-level deselect.
Technical Context
The 71256SA20PZG8 implements fully static asynchronous logic with no clocks or refresh required. Its address decoder drives a 262,144-bit memory array using high-reliability CMOS process technology, supporting concurrent address setup (tAS = 0 ns), output hold (tOH = 3 ns), and write recovery (tWR = 0 ns).
It uses TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and delivers VOH ≥ 2.4 V / VOL ≤ 0.4 V at specified loads. Standby power management includes two distinct modes: ISB (TTL-level CS deselect, 40 mA max) and ISB1 (CMOS-level CS deselect, 15 mA max), enabling precise system-level power gating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits), byte-wide parallel interface |
| Access Time (tAA) | 20 ns maximum - guarantees deterministic read latency across full industrial temperature range |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS system rails without regulation overhead |
| Standby Current (ISB1) | 15 mA maximum at CMOS-level chip deselect - enables ultra-low-power sleep states in battery-backed systems |
| I/O Compatibility | TTL-input and TTL-output compatible - eliminates level-shifting requirements in mixed-logic designs |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, motor drives, and outdoor telemetry hardware |
| Package | 28-pin TSOP Type I (PZG28), 8.1 mm × 13.4 mm footprint - surface-mount compatible with automated PCB assembly |
Pinout & Package
71256SA20PZG8 is housed in a 28-pin TSOP Type I (PZG28) package with 0.5 mm lead pitch and JEDEC-standard pinout. The package supports reflow soldering and provides mechanical robustness for vibration-prone industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus selecting one of 32,768 memory locations; no internal latching - requires stable address during CS low |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by WE and CS; high-impedance when deselected or OE high |
| CS | Chip Select | Active-low enable for entire device; controls ISB/ISB1 standby modes and initiates all read/write cycles |
| OE | Output Enable | Active-low control for output drivers only; allows read data to appear without affecting write capability |
| WE | Write Enable | Active-low signal qualifying write operations; overlapping low WE and low CS defines write window per timing diagram |
| VCC | Power Supply | +5 V ±10 % main supply; powers core logic and I/O buffers; decoupling required per high-speed RAM layout guidelines |
| GND | Ground Reference | Signal and power ground reference; must be low-inductance connection to minimize noise coupling into memory array |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Static Operation | No clock, no refresh, no wait states - simplifies timing-critical microcontroller interfaces and FPGA memory controllers |
| Dual-Enable Control (CS + OE) | Enables partial memory access control: CS gates device activity, OE gates output drivers - supports multi-drop bus sharing |
| Two-Tier Standby Power Modes | ISB1 (15 mA) at CMOS-level CS deselect enables deeper sleep than ISB (40 mA) at TTL-level deselect - improves system energy budgeting |
| TTL-Compatible Interface | Direct connection to 5 V microcontrollers, CPLDs, and legacy logic families without level translators or pull-up resistors |
| Industrial Temperature Qualification | Guaranteed 20 ns performance across –40°C to +85°C - validated for use in motor control cabinets and factory-floor HMI units |
Applications
| Industrial PLC Memory Buffer | Legacy Medical Instrument Data Cache |
|---|---|
|
Use Scenario: Real-time I/O scanning in programmable logic controllers where deterministic memory access avoids scan-time jitter. IC Role / Device Role / Timing Role: Asynchronous SRAM buffer storing process variable snapshots between CPU fetch cycles and field I/O updates. Use Value: 20 ns tAA ensures sub-microsecond read latency even at 85°C ambient, maintaining cycle consistency in thermally stressed enclosures. |
Use Scenario: Temporary waveform storage in electrocardiogram (ECG) front-end modules prior to digital signal processing. IC Role / Device Role / Timing Role: High-reliability, non-refreshing data capture memory interfacing directly with analog-to-digital converter output registers. Use Value: TTL-compatible I/O and 5 V supply eliminate interface logic, reducing BOM count and board space in compact medical PCBs. |
| Automated Test Equipment Pattern RAM | Avionics Display Controller Frame Buffer |
|
Use Scenario: Storing test vector sequences in boundary-scan or functional test systems requiring fast, repeatable memory access. IC Role / Device Role / Timing Role: Byte-wide pattern memory accessed by FPGA-based sequencer with strict setup/hold timing compliance. Use Value: tAS = 0 ns and tDH = 0 ns simplify FPGA timing closure; TSOP-28 package supports dense layout in modular ATE backplanes. |
Use Scenario: Frame buffer for monochrome cockpit display controllers in certified avionics subsystems. IC Role / Device Role / Timing Role: Radiation-tolerant (qualified) SRAM holding pixel data for raster-scan video generation in DO-254-compliant designs. Use Value: Industrial temperature rating and Renesas qualification history support extended life-cycle deployment in uncooled avionics bays. |
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-bit, 45 ns access, 3.3 V supply, SOIC-28 package | Requires voltage translation in 5 V systems; slower timing limits real-time use cases | Select only if migrating to 3.3 V architecture and relaxing timing constraints |
| AS6C4008-20TIN | 512K × 8-bit, 20 ns access, 5 V supply, TSOP-32 package | Higher density but incompatible pinout and larger package; not drop-in | Consider for capacity upgrade paths where board redesign is acceptable |
Compared with 71256SA20PZG8, CY62128EV30LL-45ZSXIT trades speed and voltage compatibility for lower cost in non-critical applications, while AS6C4008-20TIN offers double density at same speed but demands PCB layout revision due to 32-pin TSOP footprint and different address/data pin mapping.
Availability
71256SA20PZG8 is available at Aetrix Electronics and suitable for industrial automation, legacy medical equipment, and avionics subsystems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for 71256SA20PZG8 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 71256SA20PZG8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for reliability-critical embedded systems needing deterministic, low-latency, non-volatile-buffered memory without refresh overhead.
FAQ
What is the operating temperature range for the 71256SA20PZG8?
The 71256SA20PZG8 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all AC and DC parameters including 20 ns access time, standby current (ISB1 ≤15 mA), and TTL-compatible I/O thresholds. The device undergoes full characterization and screening per Renesas industrial qualification standards.
Does the 71256SA20PZG8 require a clock or refresh circuit?
No, the 71256SA20PZG8 uses fully static CMOS design and requires no clock signal or periodic refresh cycles. It retains data indefinitely as long as VCC is applied and CS remains high during standby. This eliminates timing controller complexity in microcontroller- or FPGA-based memory interfaces.
What package type does the 71256SA20PZG8 use, and is it RoHS compliant?
The 71256SA20PZG8 uses a 28-pin TSOP Type I (PZG28) package with 0.5 mm lead pitch. Per Renesas ordering information and datasheet revision 06/29/20, this part is a green (lead-free, RoHS-compliant) device, indicated by the "G" suffix in the orderable ID and confirmed in the "Green parts available" feature statement.
How does the dual standby mode (ISB vs. ISB1) work on the 71256SA20PZG8?
The 71256SA20PZG8 offers two standby current modes: ISB activates when CS > VIH (TTL-high, ≤5.5 V), drawing up to 40 mA; ISB1 activates when CS > VHC (CMOS-high, VCC – 0.2 V), drawing ≤15 mA. Designers select ISB1 for lowest power by ensuring clean CMOS-level deassertion of CS in their power management firmware.
Can the 71256SA20PZG8 be used with a 3.3 V microcontroller?
The 71256SA20PZG8 is specified for 4.5 V to 5.5 V operation and features TTL-compatible inputs (VIH ≥ 2.2 V, VIL ≤ 0.8 V), so it accepts 3.3 V logic HIGH signals safely. However, its outputs swing to VOH ≥ 2.4 V (at –4 mA), which may fall below minimum VIH of some 3.3 V receivers; level-shifting or receiver validation is recommended for reliable interoperation.
71256SA20PZG8 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:
- 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
71256SA20PZG8 FAQ
1.How can I place an order for 71256SA20PZG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA20PZG8 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 71256SA20PZG8 reliable?
The price and inventory of 71256SA20PZG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA20PZG8 is usually 5 days.
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4.How is shipping managed for 71256SA20PZG8?
71256SA20PZG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA20PZG8 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 71256SA20PZG8?
For technical support, including 71256SA20PZG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA20PZG8 requirements.
6.How does Aetrix verify that 71256SA20PZG8 is sourced from the original manufacturer or authorized distributors?
All 71256SA20PZG8 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 71256SA20PZG8 meets industry standards.
7.What is the process for return or replacement of 71256SA20PZG8?
All 71256SA20PZG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA20PZG8, 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 71256SA20PZG8 part is unused and in its original packaging.
Return procedure for 71256SA20PZG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71256SA20PZG8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT24C08C-STUM-T
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