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Renesas 71256SA15PZGI
- Part No.:
- 71256SA15PZGI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
71256SA15PZGI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,719
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Product details
Overview
71256SA15PZGI from Renesas Electronics is a 262,144-bit (32K × 8) 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 - used for real-time data buffering in embedded controllers and legacy industrial PLCs.
For engineers reviewing the 71256SA15PZGI datasheet, 71256SA15PZGI pinout, 71256SA15PZGI application, or 71256SA15PZGI equivalent, this page delivers verified timing parameters, industrial-grade standby current (ISB1 = 15 mA), output enable latency (tOE = 7 ns), and TSOP-specific pin mapping - critical for memory subsystem validation in safety-critical control systems.
Technical Context
The 71256SA15PZGI implements fully static asynchronous architecture with no clocks or refresh required. Its dual-control logic supports both chip-select–driven and output-enable–driven read cycles, enabling flexible bus arbitration in microcontroller-based systems.
It features two distinct standby modes: TTL-level ISB (40 mA at 15 ns speed) and CMOS-level ISB1 (15 mA), activated by voltage thresholds on CS (VHC = VCC – 0.2 V). All 8 bidirectional I/O lines are directly TTL-compatible with VOH ≥ 2.4 V and VOL ≤ 0.4 V under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits), byte-wide parallel interface |
| Access Time (tAA) | 15 ns max - determines minimum CPU wait-state insertion for 80C188/80C186-based systems |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails without regulation overhead |
| Industrial Temp Range | –40°C to +85°C - qualified for uncontrolled cabinet environments in factory automation |
| Standby Current (ISB1) | 15 mA max at CMOS-level CS deassertion - enables low-power sleep mode in battery-backed controllers |
| I/O Compatibility | TTL input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive (8 mA sink / 4 mA source) - interoperable with 74LS/74ALS families |
| Package | 28-pin TSOP Type I (PZG28), 8.1 mm × 13.4 mm footprint - surface-mount compatible with high-density PCB layouts |
Pinout & Package
71256SA15PZGI 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 0–32,767 row/column decode; 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 OE - no external transceivers needed |
| CS | Chip Select | Active-low enable; asserts memory array and control logic - primary selection signal for multi-chip memory maps |
| OE | Output Enable | Active-low; gates output drivers only - allows read data to be enabled/disabled independently of CS for bus sharing |
| WE | Write Enable | Active-low; controls write cycle initiation and data capture timing - defines tWP (10 ns min) and tDW (7 ns min) |
| VCC | Power Supply | +5 V ±10 % main supply - powers core logic and I/O buffers; decoupling required within 10 mm |
| GND | Ground Reference | Signal and power return - must be low-impedance plane adjacent to VCC for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Static Operation | No clock, no refresh, no hidden cycles - deterministic timing for hard real-time interrupt service routines |
| Dual Standby Modes | ISB1 = 15 mA (CMOS-level CS) enables ultra-low-power hold state; ISB = 40 mA (TTL-level CS) supports faster wake-up |
| Fast Output Enable | tOE = 7 ns max - reduces bus turnaround latency in shared-memory multiprocessor backplanes |
| TSOP-28 Green Packaging | Lead-free, halogen-free PZG28 package - meets RoHS/REACH requirements for industrial equipment export compliance |
| Industrial Temperature Qualification | Full 15 ns timing guaranteed across –40°C to +85°C - eliminates derating calculations for outdoor or motor-adjacent deployments |
Applications
| Industrial PLC Data Buffering | Legacy CNC Motion Controller Memory |
|---|---|
|
Use Scenario: Storing axis position snapshots and I/O status in programmable logic controllers operating in dusty, vibration-prone factory floors. IC Role / Device Role / Timing Role: Byte-wide SRAM providing zero-wait-state scratchpad memory for ladder logic execution and cyclic I/O image updates. Use Value: 15 ns tAA and industrial temp rating ensure deterministic response under thermal cycling; TSOP package withstands mechanical shock better than DIP. |
Use Scenario: Holding G-code segment buffers and encoder feedback history in retrofit CNC controllers using 80C188EB CPUs. IC Role / Device Role / Timing Role: Asynchronous parallel memory interfaced directly to 80C188's multiplexed address/data bus via external latch. Use Value: OE-controlled read gating enables clean bus sharing with analog I/O peripherals; ISB1 = 15 mA extends backup battery life during emergency stop events. |
| Ruggedized HMI Display Frame Buffer | Avionics Test Equipment Scratchpad |
|
Use Scenario: Serving as pixel buffer for monochrome LCD displays in marine HMIs exposed to salt fog and wide ambient swings. IC Role / Device Role / Timing Role: Non-refreshed frame store accessed via dedicated video controller DMA channel with burst reads. Use Value: TTL-compatible I/O eliminates level-shifter components; –40°C to +85°C operation prevents cold-start failure in unheated enclosures. |
Use Scenario: Temporary storage for sensor calibration coefficients and test result logs in portable avionics ground-test sets. IC Role / Device Role / Timing Role: Battery-backed SRAM holding volatile configuration data during power cycling between aircraft maintenance sessions. Use Value: Low ISB1 current minimizes self-discharge of backup lithium cells; TSOP footprint allows compact, conformal-coated PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZAXI | 32K × 8, 45 ns access, 3.3 V supply, SOIC-28 package | Requires level translation for 5 V systems; slower timing limits use in high-throughput controllers | Select only if migrating to 3.3 V architecture and relaxing timing constraints |
| AS6C4008-15ZIN | 512K × 8, 15 ns access, 5 V supply, TSOP-32 package | Higher density but incompatible pinout (32-pin vs. 28-pin); requires PCB redesign | Consider for capacity upgrades where board revision is feasible and footprint expansion is allowed |
Compared with 71256SA15PZGI, CY62128EV30LL-45ZAXI trades speed and voltage compatibility for lower power, while AS6C4008-15ZIN offers density at the cost of mechanical and electrical rework - making 71256SA15PZGI optimal for drop-in replacement in existing 5 V, TSOP-28 industrial designs.
Availability
71256SA15PZGI is available at Aetrix Electronics and suitable for industrial PLCs, legacy CNC controllers, ruggedized HMIs, and avionics ground-test equipment requiring stable component supply across extended lifecycle programs.
Supply support for 71256SA15PZGI 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 71256SA series was developed as a high-reliability, pin-compatible successor to industry-standard 256K SRAMs, targeting long-lifecycle industrial control and instrumentation applications where obsolescence resistance matters.
FAQ
What is the maximum operating temperature range for the 71256SA15PZGI?
The 71256SA15PZGI is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all AC and DC parameters in the datasheet, including 15 ns access time and 15 mA ISB1 standby current. Unlike commercial variants, the 71256SA15PZGI undergoes extended burn-in and screening to maintain timing integrity under thermal stress - critical for deployment in unventilated control cabinets.
Does the 71256SA15PZGI require a clock or refresh signal?
No, the 71256SA15PZGI uses fully static CMOS circuitry and requires neither a clock nor periodic refresh. It retains data indefinitely as long as VCC remains within 4.5 V–5.5 V and ambient temperature stays within –40°C to +85°C. This eliminates timing-critical refresh overhead in real-time systems - a key advantage over DRAM or pseudo-static RAM alternatives.
What is the function of the OE pin on the 71256SA15PZGI?
The OE (Output Enable) pin on the 71256SA15PZGI is an active-low control that independently enables or disables the output drivers without deselecting the chip. When OE is high, I/O0–I/O7 enter high-impedance state even if CS is low - allowing multiple 71256SA15PZGI devices to share a common data bus. Its 7 ns tOE parameter ensures minimal bus contention delay during read arbitration.
Can the 71256SA15PZGI be used with a 3.3 V microcontroller interface?
The 71256SA15PZGI is specified for 5 V operation only (VCC = 4.5–5.5 V) and features TTL-compatible inputs (VIH ≥ 2.2 V) and outputs (VOH ≥ 2.4 V). While its VIH threshold permits recognition of 3.3 V logic highs, the device itself must be powered at 5 V. Direct connection to 3.3 V-only buses requires level-shifting; mismatched supply domains risk violating VTERM absolute maximum ratings.
What package type does the 71256SA15PZGI use, and is it RoHS-compliant?
The 71256SA15PZGI uses a 28-pin TSOP Type I (PZG28) package with 0.5 mm pitch and conforms to JEDEC MO-153. It is a Green part - lead-free and halogen-free per Renesas' ordering information - meeting RoHS Directive 2011/65/EU and REACH SVHC requirements. The "G" suffix in the part number explicitly denotes Green compliance.
71256SA15PZGI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tray
- 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
71256SA15PZGI FAQ
1.How can I place an order for 71256SA15PZGI through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA15PZGI 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 71256SA15PZGI reliable?
The price and inventory of 71256SA15PZGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA15PZGI is usually 5 days.
3.What payment methods are accepted for 71256SA15PZGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA15PZGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA15PZGI?
71256SA15PZGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA15PZGI 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 71256SA15PZGI?
For technical support, including 71256SA15PZGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA15PZGI requirements.
6.How does Aetrix verify that 71256SA15PZGI is sourced from the original manufacturer or authorized distributors?
All 71256SA15PZGI 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 71256SA15PZGI meets industry standards.
7.What is the process for return or replacement of 71256SA15PZGI?
All 71256SA15PZGI units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA15PZGI, 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 71256SA15PZGI part is unused and in its original packaging.
Return procedure for 71256SA15PZGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71256SA15PZGI Tags
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