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Renesas 71256SA12PZG8
- Part No.:
- 71256SA12PZG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
71256SA12PZG8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,459
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Product details
Overview
71256SA12PZG8 from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with 12 ns access time, TTL-compatible I/O, single 5 V supply operation, and industrial-grade reliability in TSOP-28 package. It serves as main or cache memory in embedded controllers, data acquisition systems, and real-time communication interfaces requiring deterministic, zero-refresh asynchronous access.
For engineers reviewing the 71256SA12PZG8 datasheet, 71256SA12PZG8 pinout, 71256SA12PZG8 application, or 71256SA12PZG8 equivalent, key selection criteria include guaranteed 12 ns tAA/tRC timing at commercial temperature (0°C to +70°C), low-power standby modes (ISB1 = 15 mA), bidirectional TTL-compatible I/O, and TSOP-28 footprint compatibility with legacy SRAM-based designs.
Technical Context
The 71256SA12PZG8 implements fully static asynchronous circuitry-no clocks or refresh cycles required-and uses dual-control enable logic with independent Chip Select (CS) and Output Enable (OE) pins to support interleaved read/write operations and output tri-state management. Its address decoding is internal and fully decoded for all 15 address lines (A0–A14).
It supports two distinct standby states: ISB (TTL-level CS deassertion, 50 mA max) and ISB1 (CMOS-level CS deassertion with input voltage thresholds VLC/VHC, 15 mA max), enabling dynamic power optimization based on system-level control signaling. All timing parameters-including tCLZ (4 ns), tOHZ (6 ns), and tOE (6 ns)-are specified under defined AC test loads per Renesas Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits), no refresh required |
| Access Time (tAA) | 12 ns maximum - guarantees deterministic read latency from address valid to data valid |
| Cycle Time (tRC) | 12 ns maximum - enables 83.3 MHz sustained random access rate |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails |
| Operating Temperature | 0°C to +70°C - commercial grade, validated for stable performance across full range |
| Standby Current (ISB1) | 15 mA maximum - achieved only when CS driven above VHC (VCC − 0.2 V), enabling ultra-low-power sleep |
| I/O Interface | TTL-compatible bidirectional data bus (I/O0–I/O7) - eliminates level-shifting in 5 V systems |
Pinout & Package
71256SA12PZG8 is housed in a 28-pin Thin Small Outline Package (TSOP Type I, PZG28), 300-mil width, surface-mount compatible with JEDEC MO-141AC standards. 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 supporting full 32K-word addressing; internally decoded, no external address latching needed |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by WE and CS; high-impedance when disabled |
| CS | Chip Select Input | Active-low enable for device selection; controls ISB/ISB1 standby current modes based on logic threshold |
| OE | Output Enable Input | Active-low control of output drivers; allows read-data gating without deselecting chip (CS remains low) |
| WE | Write Enable Input | Active-low signal initiating write cycle; determines timing relationship with CS and address setup/hold |
| VCC | Power Supply | +5 V supply pin; decoupling capacitor placement near this pin critical for noise immunity during fast transitions |
| GND | Ground Reference | Signal and power ground return; must be low-inductance connection to minimize switching noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Static Operation | No clock, no refresh, no wait states - simplifies timing-critical control firmware and eliminates DRAM-like complexity |
| Dual Standby Modes (ISB / ISB1) | Supports both TTL- and CMOS-level CS deassertion, enabling flexible power-gating strategies in mixed-signal systems |
| Fast Output Enable (tOE = 6 ns) | Enables rapid read burst access without full chip reselection - critical for FIFO-style buffering and register file emulation |
| Low-Impedance AC Test Load Compliance | Specified with 5 pF load (Figure 2) - ensures timing validity in typical PCB trace + scope probe environments |
| Green Packaging (RoHS Compliant) | Pb-free TSOP-28 construction with halogen-free molding compound - meets IPC-1752A and EU RoHS 2011/65/EU requirements |
Applications
| Industrial PLC Memory Buffer | Medical Imaging Frame Store |
|---|---|
|
Use Scenario: Real-time I/O scanning and logic execution in programmable logic controllers where deterministic memory access prevents scan-time jitter. IC Role / Device Role / Timing Role: Primary working memory for ladder logic execution engine; provides sub-15 ns read/write turnaround for status registers and operand storage. Use Value: Eliminates need for external wait-state generators or glue logic due to guaranteed 12 ns tAA and tWC - reduces BOM count and PCB area. |
Use Scenario: Temporary frame buffering in portable ultrasound or digital X-ray units before compression or transmission. IC Role / Device Role / Timing Role: High-reliability, zero-refresh frame buffer interfacing directly with 8-bit parallel image sensor outputs and DSP data buses. Use Value: TTL-compatible I/O and 5 V operation simplify interface to legacy imaging ASICs; TSOP-28 footprint supports compact, thermally constrained handheld enclosures. |
| Avionics Data Logger | Test & Measurement Pattern Generator |
|
Use Scenario: Capturing high-speed analog-to-digital samples during flight-critical sensor monitoring with guaranteed data retention across thermal cycling. IC Role / Device Role / Timing Role: Non-volatile-adjacent volatile buffer storing pre-trigger snapshots; operates continuously within commercial temp range under controlled cabin environment. Use Value: 12 ns cycle time enables 83.3 MHz sampling correlation window; ISB1 mode cuts standby power by 70% vs ISB during idle logging intervals. |
Use Scenario: Generating precise, repeatable digital stimulus waveforms for IC functional validation using pattern memory lookup tables. IC Role / Device Role / Timing Role: Addressable waveform memory mapped to FPGA or microcontroller address bus; accessed synchronously via CS/OE strobes. Use Value: tCLZ = 4 ns and tOHZ = 6 ns ensure clean, glitch-free waveform edge alignment; bidirectional I/O allows in-system waveform update without bus contention. |
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-45ZSXI | 32K × 8-bit, 45 ns access, 3.3 V supply, -40°C to +85°C industrial grade | Lower speed but wider temperature range and lower voltage - suitable for battery-powered or extended-temp deployments | Select when 3.3 V system integration or industrial temperature operation is mandatory; not drop-in for 5 V or <15 ns timing. |
| AS6C4008-55ZIN | 512K × 8-bit, 55 ns access, 5 V supply, 0°C to +70°C commercial grade | Higher density but slower - fits memory expansion where bandwidth > latency is prioritized | Choose when >256 Kbit capacity is required and 12 ns timing is non-critical; same 5 V/TSOP-28 footprint but larger die size may affect layout. |
Compared with CY62128EV30LL-45ZSXI and AS6C4008-55ZIN, the 71256SA12PZG8 uniquely delivers 12 ns access at 5 V in commercial-grade TSOP-28, making it optimal for cost-sensitive, latency-constrained 5 V embedded systems where industrial temp or higher density are secondary concerns.
Availability
71256SA12PZG8 is available at Aetrix Electronics and suitable for industrial PLC memory buffers, medical imaging frame stores, avionics data loggers, and test & measurement pattern generators requiring stable component supply, long-lifecycle support, and RoHS-compliant TSOP packaging.
Supply support for 71256SA12PZG8 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 71256SA12PZG8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for deterministic, zero-refresh memory subsystems in 5 V embedded control and instrumentation platforms.
FAQ
What is the operating temperature range for the 71256SA12PZG8?
The 71256SA12PZG8 is rated for commercial temperature operation from 0°C to +70°C. Although other variants in the IDT71256SA family support industrial range (–40°C to +85°C), the 12 ns speed grade-including 71256SA12PZG8-is explicitly designated for commercial use only, as confirmed in the Renesas ordering information table and datasheet revision notes dated November 2014 and June 2020.
Does the 71256SA12PZG8 require a refresh circuit or clock signal?
No, the 71256SA12PZG8 is a fully static RAM and requires neither refresh circuitry nor a clock signal. Its internal design uses static CMOS latches for each memory cell, enabling indefinite data retention as long as power is applied and address/control signals remain stable - a key advantage over DRAM in deterministic real-time systems.
What is the difference between ISB and ISB1 standby current in the 71256SA12PZG8?
ISB (50 mA max) activates when CS is pulled above VIH (≥2.2 V), while ISB1 (15 mA max) engages only when CS exceeds the stricter CMOS threshold VHC (VCC – 0.2 V, i.e., ~4.8 V at 5.0 V supply). This dual-mode architecture allows system designers to choose between faster wake-up (ISB) or deeper power savings (ISB1) depending on control logic voltage levels.
Can the 71256SA12PZG8 be used with 3.3 V logic interfaces?
The 71256SA12PZG8 is specified for 4.5 V to 5.5 V operation and features TTL-compatible inputs (VIH ≥ 2.2 V, VIL ≤ 0.8 V), but its outputs swing rail-to-rail (VOH ≥ 2.4 V at 5 V). Direct connection to 3.3 V logic is not recommended without level translation, as VOH may exceed 3.3 V absolute maximum ratings and I/O capacitance (7 pF) is optimized for 5 V drive strength.
Is the 71256SA12PZG8 RoHS compliant and lead-free?
Yes, the 71256SA12PZG8 is a green part per Renesas ordering information: it uses Pb-free TSOP packaging with halogen-free molding compound and complies with EU RoHS Directive 2011/65/EU and IPC-1752A material declaration standards. The "G" suffix in the part number explicitly denotes green compliance.
71256SA12PZG8 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:
- 12ns
- Access Time:
- 12 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
71256SA12PZG8 FAQ
1.How can I place an order for 71256SA12PZG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA12PZG8 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 71256SA12PZG8 reliable?
The price and inventory of 71256SA12PZG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA12PZG8 is usually 5 days.
3.What payment methods are accepted for 71256SA12PZG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA12PZG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA12PZG8?
71256SA12PZG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA12PZG8 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 71256SA12PZG8?
For technical support, including 71256SA12PZG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA12PZG8 requirements.
6.How does Aetrix verify that 71256SA12PZG8 is sourced from the original manufacturer or authorized distributors?
All 71256SA12PZG8 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 71256SA12PZG8 meets industry standards.
7.What is the process for return or replacement of 71256SA12PZG8?
All 71256SA12PZG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA12PZG8, 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 71256SA12PZG8 part is unused and in its original packaging.
Return procedure for 71256SA12PZG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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