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Renesas 71256SA15PZGI8
- Part No.:
- 71256SA15PZGI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
71256SA15PZGI8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,368
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Product details
Overview
71256SA15PZGI8 from Renesas Electronics is a 32K × 8 (256 Kbit) high-speed CMOS static RAM with industrial temperature range (–40°C to +85°C), 15 ns access time, TTL-compatible I/O, single 5 V supply operation, and TSOP-28 package. It serves as asynchronous main or buffer memory in real-time control systems requiring deterministic read/write timing without refresh.
For engineers reviewing the 71256SA15PZGI8 datasheet, 71256SA15PZGI8 pinout, 71256SA15PZGI8 application, or 71256SA15PZGI8 equivalent, key selection criteria include industrial-grade reliability, 15 ns cycle time under full temperature range, low standby current (ISB1 = 15 mA), and compatibility with legacy 5 V TTL bus interfaces in avionics data loggers, programmable logic controllers, and medical imaging subsystems.
Technical Context
The 71256SA15PZGI8 implements fully static asynchronous architecture-no clocks or refresh required-with independent chip select (CS) and output enable (OE) controls enabling fast read cycles (tAA = 15 ns, tOE = 7 ns) and write cycles (tWC = 15 ns, tWP = 10 ns). Its bidirectional TTL-compatible I/O lines support direct connection to microcontroller data buses without level-shifting.
It features dual standby modes: ISB (TTL-level CS deassertion, 40 mA max) and ISB1 (CMOS-level CS deassertion, 15 mA max), allowing power optimization based on system control logic voltage thresholds. All DC and AC parameters-including VIH/VIL, VOL/VOH, and leakage currents-are guaranteed across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data transfers without interleaving or banking logic |
| Access Time (tAA) | 15 ns max at VCC = 4.5–5.5 V and TA = –40°C to +85°C; enables ≤66.7 MHz burst read throughput in synchronous bus wrappers |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V logic rails and tolerant of ±10% regulation variation |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V, f = 0, CS > VHC; allows ultra-low-power hold mode during CPU sleep in battery-backed systems |
| I/O Compatibility | TTL input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive (VOL ≤ 0.4 V @ 8 mA, VOH ≥ 2.4 V @ –4 mA); eliminates need for external bus transceivers |
| Package | 28-pin TSOP Type I (PZG28), 8.9 mm × 12.1 mm footprint; surface-mount compatible with automated PCB assembly and thermal performance suitable for convection-cooled enclosures |
| Temperature Range | Industrial grade (–40°C to +85°C); qualified per AEC-Q200 stress test conditions for extended life in harsh environments |
Pinout & Package
71256SA15PZGI8 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 accepting 0–32767 row/column decode; all inputs TTL-compatible with no internal pull-ups |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit tristatable I/O lines; direction controlled by WE and CS; drive strength matches 5 V TTL fan-out requirements |
| CS | Chip Select | Active-low enable; deassertion places device in ISB or ISB1 standby depending on voltage level; critical for multi-chip memory decoding |
| WE | Write Enable | Active-low write strobe; controls data latching on rising edge when CS is active; defines write cycle timing boundaries (tWP, tDW) |
| OE | Output Enable | Active-low output gate; enables read data after tOE = 7 ns; allows shared bus arbitration without contention |
| VCC | Power Supply | +5 V supply pin; requires local 0.1 µF ceramic decoupling; supports full-speed operation across full temperature range |
| GND | Ground Reference | Signal and power ground return; must be low-impedance connection to minimize noise coupling into sensitive I/O paths |
Key Features
| Feature | Design Value |
|---|---|
| Fully static asynchronous operation | No clock, no refresh, no wait states-simplifies timing design in microcontroller-based systems with variable bus loading |
| Dual standby current modes (ISB / ISB1) | Enables hierarchical power management: ISB1 (15 mA) for deep sleep, ISB (40 mA) for fast wake-up readiness |
| TTL-compatible I/O with guaranteed VOH/VOL | Direct interface to legacy 8051, Z80, and 68K-family microcontrollers without level shifters or bus buffers |
| Industrial temperature qualification (–40°C to +85°C) | Validated for continuous operation in factory automation PLCs, railway signaling modules, and outdoor telecom base station controllers |
| Green (lead-free) TSOP packaging | RoHS-compliant PZG28 package meets IPC/JEDEC J-STD-020 reflow profile and supports automated optical inspection (AOI) |
Applications
| Industrial PLC Data Buffer | Avionics Flight Data Recorder |
|---|---|
Use Scenario: Real-time buffering of sensor inputs and actuator commands in modular programmable logic controllers with deterministic scan cycles. IC Role / Device Role / Timing Role: Asynchronous SRAM providing zero-wait-state read/write access for ladder logic execution engines and I/O mapping tables. Use Value: 15 ns access ensures sub-microsecond response to interrupt-driven I/O events, while industrial temp rating guarantees uptime in unconditioned control cabinets. | Use Scenario: Storing timestamped flight parameter snapshots (altitude, attitude, engine RPM) during pre-crash sequences in certified black box recorders. IC Role / Device Role / Timing Role: Non-refreshing memory buffer capturing high-frequency analog-to-digital conversion streams without DMA overhead or timing jitter. Use Value: Fully static operation prevents data corruption during vibration-induced power sags; ISB1 mode extends battery-backed retention time between recordings. |
| Medical Ultrasound Image Frame Store | Railway Signaling Interlocking Logic |
Use Scenario: Temporary storage of digitized B-mode ultrasound frames prior to compression and display in portable diagnostic devices. IC Role / Device Role / Timing Role: Byte-accessible frame buffer supporting simultaneous read (display pipeline) and write (ADC capture) via OE/WE-controlled bus arbitration. Use Value: TTL-compatible I/O eliminates level-shifting components, reducing BOM count and EMI risk near sensitive analog front-ends. | Use Scenario: Holding safety-critical interlocking state tables in European Rail Traffic Management System (ERTMS) Level 1 balise readers. IC Role / Device Role / Timing Role: Deterministic memory for SIL-3-certified logic tables accessed by dual-redundant microcontrollers with lockstep verification. Use Value: Guaranteed 15 ns timing across –40°C to +85°C ensures predictable worst-case execution time (WCET) for safety analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZSXIT | 32K × 8, 45 ns access, 3.3 V only, SOIC-28; lower speed, different voltage domain | Not suitable for 5 V TTL bus systems; requires level translation or redesign if replacing 71256SA15PZGI8 | Select only if migrating to 3.3 V architecture and relaxing timing constraints |
| AS6C4008-15TIN | 512K × 8, 15 ns, 5 V, TSOP-32; larger density, extra address pins, different pinout | Requires PCB layout change due to 32-pin TSOP and A15/A16 additions; not drop-in | Consider for future designs needing memory expansion headroom, but not for direct replacement |
Compared with CY62128EV30LL-45ZSXIT and AS6C4008-15TIN, the 71256SA15PZGI8 uniquely delivers 15 ns 5 V TTL-compatible performance in a 28-pin TSOP footprint with industrial temperature support-making it irreplaceable in legacy 5 V embedded systems where board space, voltage compatibility, and timing determinism are non-negotiable.
Availability
71256SA15PZGI8 is available at Aetrix Electronics and suitable for industrial PLC data buffering, avionics flight data recording, and medical ultrasound frame storage requiring stable component supply across extended product lifecycles.
Supply support for 71256SA15PZGI8 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, with over 40 years of memory IP heritage.
The IDT71256SA family-now part of Renesas' legacy high-speed SRAM portfolio-was engineered specifically for deterministic, low-latency memory in 5 V microcontroller and DSP systems where refresh-free operation and industrial reliability are mandatory.
FAQ
What is the operating temperature range specified for the 71256SA15PZGI8?
The 71256SA15PZGI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all AC and DC electrical parameters-including access time (tAA = 15 ns), standby current (ISB1 = 15 mA), and I/O voltage thresholds-as validated in the Renesas datasheet revision Jun.29.20. The "I" suffix in the part number explicitly denotes this industrial grade qualification.
Does the 71256SA15PZGI8 require a clock signal or periodic refresh?
No, the 71256SA15PZGI8 uses fully static CMOS circuitry and requires neither a clock signal nor periodic refresh cycles. Its asynchronous design allows indefinite data retention as long as VCC is maintained within 4.5 V–5.5 V and ambient temperature stays within –40°C to +85°C. This eliminates timing controller overhead and makes it ideal for safety-critical systems where deterministic latency is essential.
What is the meaning of the "PZGI8" suffix in 71256SA15PZGI8?
The "PZGI8" suffix breaks down as follows: "PZ" = TSOP Type I package, "G" = Green (lead-free), "I" = Industrial temperature grade (–40°C to +85°C), and "8" = tape-and-reel packaging format. This matches Renesas' official ordering information table, confirming the device is supplied in 8 mm tape on reels for SMT placement, with RoHS-compliant finish and full industrial qualification.
Can the 71256SA15PZGI8 be used with a 3.3 V microcontroller interface?
The 71256SA15PZGI8 is designed for 5 V operation (VCC = 4.5–5.5 V) and features TTL-compatible I/O thresholds-not 3.3 V LVTTL or LVCMOS. Direct connection to 3.3 V logic risks violating VIH/VIL limits and may cause unreliable reads/writes. A level-shifting solution (e.g., TXB0108 or discrete MOSFET translator) is required for safe interoperability with 3.3 V controllers.
What are the two standby current modes supported by the 71256SA15PZGI8?
The 71256SA15PZGI8 supports ISB (TTL-level standby, max 40 mA) when CS > VIH, and ISB1 (CMOS-level standby, max 15 mA) when CS > VHC (≈ VCC – 0.2 V). This dual-mode capability allows system designers to choose between faster wake-up latency (ISB) or deeper power savings (ISB1), depending on host controller's output drive strength and sleep duration requirements.
71256SA15PZGI8 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:
- 15ns
- Access Time:
- 15 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
71256SA15PZGI8 FAQ
1.How can I place an order for 71256SA15PZGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA15PZGI8 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 71256SA15PZGI8 reliable?
The price and inventory of 71256SA15PZGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA15PZGI8 is usually 5 days.
3.What payment methods are accepted for 71256SA15PZGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA15PZGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA15PZGI8?
71256SA15PZGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA15PZGI8 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 71256SA15PZGI8?
For technical support, including 71256SA15PZGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA15PZGI8 requirements.
6.How does Aetrix verify that 71256SA15PZGI8 is sourced from the original manufacturer or authorized distributors?
All 71256SA15PZGI8 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 71256SA15PZGI8 meets industry standards.
7.What is the process for return or replacement of 71256SA15PZGI8?
All 71256SA15PZGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA15PZGI8, 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 71256SA15PZGI8 part is unused and in its original packaging.
Return procedure for 71256SA15PZGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71256SA15PZGI8 Tags
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