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Renesas 71256SA15PZG
- Part No.:
- 71256SA15PZG
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
71256SA15PZG.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,137
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Product details
Overview
71256SA15PZG from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with 15 ns access and cycle times, TTL-compatible I/O, single 5 V supply operation, and industrial-grade reliability across 0°C to +70°C commercial temperature range. It serves as a non-refreshing, asynchronous memory buffer in embedded controllers, instrumentation front-ends, and legacy bus-based systems requiring deterministic read/write timing.
For engineers reviewing the 71256SA15PZG datasheet, 71256SA15PZG pinout, 71256SA15PZG application, or 71256SA15PZG equivalent, key selection criteria include its 28-pin TSOP package, 15 ns tAA/tRC timing, dual standby current modes (ISB = 40 mA, ISB1 = 15 mA), and direct compatibility with 5 V TTL address/data buses without level translation.
Technical Context
The 71256SA15PZG implements fully static asynchronous circuitry-no clocks or refresh required-with independent Chip Select (CS) and Output Enable (OE) controls enabling fast read cycles (tOE = 7 ns) and precise output gating. Its bidirectional I/O architecture supports concurrent data-in and data-out paths on shared pins, managed by CS, OE, and Write Enable (WE) logic per JEDEC-standard SRAM protocol.
It uses high-reliability CMOS fabrication optimized for low power in active and standby states, with two distinct standby modes: TTL-level (ISB = 40 mA at VCC max) and CMOS-level (ISB1 = 15 mA when CS > VHC and inputs held valid), allowing system-level power optimization based on control signal drive capability.
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; guarantees data validity within 15 ns of stable address and CS assertion-critical for tight-cycle microcontroller interfaces |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS logic rails without regulation overhead |
| I/O Compatibility | TTL-input and TTL-output levels; eliminates need for external level shifters in legacy 5 V systems |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V; enables ultra-low-power hold mode when CS driven above VHC threshold |
| Operating Temperature | 0°C to +70°C; validated for commercial-grade industrial equipment and test instrumentation |
| Package | 28-pin TSOP Type I (PZG28); 8.1 mm × 13.4 mm footprint, surface-mount compatible with automated assembly |
Pinout & Package
71256SA15PZG is housed in a 28-pin TSOP Type I (PZG28) package with 0.5 mm lead pitch, designed for high-density PCB layouts and reflow soldering. Pin numbering follows standard TSOP top-view orientation with pin 1 marked by notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus (32K depth); all inputs TTL-compatible, no pull-ups required |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit shared data path; direction controlled by CS/OE/WE; drives/receives TTL levels directly |
| CS | Chip Select | Active-low enable; device enters standby (high-Z I/O) when high; supports two power-down modes |
| OE | Output Enable | Active-low read control; enables outputs independently of CS; tOE = 7 ns ensures fast data sampling |
| WE | Write Enable | Active-low write strobe; initiates write on falling edge coincident with CS low; tWP = 10 ns minimum pulse width |
| VCC | Power Supply | +5 V supply (4.5–5.5 V); decoupling required near pin 16 per layout guidelines |
| GND | Ground | Signal and power return; pin 15 is dedicated ground for noise isolation |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Static Operation | No clock, no refresh-simplifies timing design in microcontroller- or FPGA-based systems with irregular memory access patterns |
| Dual Standby Current Modes | ISB = 40 mA (TTL CS high) and ISB1 = 15 mA (CMOS CS high) allow dynamic power scaling based on host driver capability |
| Fast Output Enable | tOE = 7 ns enables rapid burst reads in real-time data acquisition where latency must be sub-10 ns |
| TSOP Packaging | PZG28 package reduces board area by ~60% vs. DIP/SOJ alternatives while maintaining full pin compatibility |
| Green Compliance | Halogen-free, RoHS-compliant construction meets modern environmental requirements without derating |
Applications
| Industrial Data Loggers | Legacy Bus-Based Controllers |
|---|---|
Use Scenario: Continuous buffering of sensor readings (e.g., temperature, pressure) at 10 kHz sample rate before batch transmission over RS-485. IC Role / Device Role / Timing Role: Asynchronous SRAM buffer staging raw ADC data; absorbs burst writes without DMA or CPU intervention. Use Value: 15 ns tAA and tWC ensure zero-wait-state operation with 8051 or Z80 derivatives running at ≤20 MHz bus clocks. | Use Scenario: Real-time control of stepper motor sequences in CNC motion controllers using ISA or VMEbus backplanes. IC Role / Device Role / Timing Role: Non-volatile shadow RAM holding firmware patch tables and motion profile lookups accessed via fixed-address windows. Use Value: TTL-compatible I/O and 5 V supply eliminate level-shifting components, reducing BOM count and signal integrity risk. |
| Test Equipment Front-Ends | Communications Protocol Analyzers |
Use Scenario: Capturing high-speed digital bus traces (e.g., SPI, I²C, parallel) into circular buffers for post-capture analysis. IC Role / Device Role / Timing Role: High-speed write buffer accepting parallel data from FPGA capture logic at up to 66 MHz effective rate. Use Value: tDW = 7 ns and tWHZ = 6 ns guarantee clean data hold and fast bus release-critical for glitch-free multi-master arbitration. | Use Scenario: Storing decoded packet headers and payload fragments during live Ethernet or CAN FD frame inspection. IC Role / Device Role / Timing Role: Dual-port accessible memory segment used by ARM Cortex-M7 core and hardware packet parser engine. Use Value: Independent CS/OE controls allow simultaneous read (CPU) and write (parser) access without bus contention or arbitration logic. |
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 time; 32K × 8 organization; 3.3 V supply only; SOIC-28 package | Requires level translation in 5 V systems; unsuitable for legacy TTL buses without interface ICs | Select only if migrating to 3.3 V architecture and redesigning power delivery and I/O interfaces |
| AS6C4008-55ZIN | 55 ns access; 512K × 8 density; 5 V supply; TSOP-32 package | Higher density but slower speed; incompatible pinout (32-pin vs. 28-pin); requires PCB redesign | Consider only for capacity upgrades where timing budget allows ≥55 ns latency and board layout permits new footprint |
Compared with CY62128EV30LL-45ZSXIT and AS6C4008-55ZIN, the 71256SA15PZG delivers optimal balance of 5 V TTL compatibility, 15 ns performance, and drop-in replaceability in existing 28-pin TSOP footprints-making it the preferred choice for sustaining legacy 5 V designs without layout changes.
Availability
71256SA15PZG is available at Aetrix Electronics and suitable for industrial data loggers, legacy bus-based controllers, test equipment front-ends, and communications protocol analyzers requiring stable component supply and long-term obsolescence management.
Supply support for 71256SA15PZG 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, and enterprise applications.
The 71256SA series was developed as a high-reliability, pin-compatible SRAM family targeting cost-sensitive, long-lifecycle industrial and instrumentation systems requiring deterministic 5 V memory performance without refresh overhead.
FAQ
What is the maximum operating frequency supported by the 71256SA15PZG?
The 71256SA15PZG does not operate on a clock; it is an asynchronous SRAM. Its maximum effective throughput is governed by tRC = 15 ns, yielding a theoretical upper limit of 66.7 MHz for consecutive read/write cycles. Actual system bandwidth depends on bus protocol overhead, address setup, and controller timing margins-not a clock frequency specification.
Does the 71256SA15PZG require external refresh circuitry?
No, the 71256SA15PZG is a fully static RAM and requires no refresh cycles or external refresh circuitry. Its CMOS latch-based memory cells retain data indefinitely as long as VCC remains within 4.5 V–5.5 V and ambient temperature stays within 0°C to +70°C-enabling simple, low-overhead integration in microcontroller-based systems.
Can the 71256SA15PZG be used in place of the 71256SA12PZG?
Yes, the 71256SA15PZG is functionally and pin-compatible with the 71256SA12PZG, differing only in guaranteed access time (15 ns vs. 12 ns). Systems designed for the faster 12 ns part will operate reliably with the 15 ns variant, though maximum bus speed may decrease slightly. No PCB or firmware changes are needed for substitution.
What is the meaning of "PZG" in the 71256SA15PZG part number?
"PZG" denotes the package type: PZG28 is Renesas' designation for a 28-pin TSOP Type I package with 0.5 mm lead pitch and 8.1 mm × 13.4 mm body dimensions. This matches industry-standard JEDEC MO-153, ensuring compatibility with standard SMT placement and reflow profiles.
Is the 71256SA15PZG compliant with RoHS and green manufacturing standards?
Yes, the 71256SA15PZG is a green, halogen-free, RoHS-compliant device per Renesas' ordering information. The "G" suffix explicitly indicates compliance with EU Directive 2011/65/EU and related restrictions on hazardous substances, with full material declarations available upon request.
71256SA15PZG 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:
- 15ns
- Access Time:
- 15 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
71256SA15PZG FAQ
1.How can I place an order for 71256SA15PZG through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA15PZG 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 71256SA15PZG reliable?
The price and inventory of 71256SA15PZG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA15PZG is usually 5 days.
3.What payment methods are accepted for 71256SA15PZG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA15PZG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA15PZG?
71256SA15PZG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA15PZG 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 71256SA15PZG?
For technical support, including 71256SA15PZG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA15PZG requirements.
6.How does Aetrix verify that 71256SA15PZG is sourced from the original manufacturer or authorized distributors?
All 71256SA15PZG 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 71256SA15PZG meets industry standards.
7.What is the process for return or replacement of 71256SA15PZG?
All 71256SA15PZG units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA15PZG, 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 71256SA15PZG part is unused and in its original packaging.
Return procedure for 71256SA15PZG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71256SA15PZG Tags
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