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Renesas HN58C256AT85E
- Part No.:
- HN58C256AT85E
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- -
- Datasheet:
-
HN58C256AT85E.pdf
- Description:
- 256K EEPROM (32KWORD X 8-BIT)
- Quantity:
- Payment:
- Shipping:
Inventory:835
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Product details
Overview
HN58C256AT85E from Renesas Electronics is a 256-kbit (32-kword × 8-bit) parallel EEPROM organized as 32768 × 8, fabricated with MNOS memory technology and CMOS circuitry. It operates on a single 5 V ±10% supply, delivers 85 ns max access time, supports automatic byte and 64-byte page write (≤10 ms), and retains data for ≥10 years. It is used in industrial control modules requiring nonvolatile parameter storage with low-power standby.
For engineers reviewing the HN58C256AT85E datasheet, HN58C256AT85E pinout, HN58C256AT85E application, or HN58C256AT85E equivalent, key selection criteria include TSOP-28 package compatibility, JEDEC byte-wide interface compliance, software data protection sequence, and absence of Ready/Busy or RES pins-features exclusive to the HN58C257A series.
Technical Context
The HN58C256AT85E implements a parallel byte-wide interface with address latching on CE or WE falling edge and data latching on CE or WE rising edge. Its internal architecture includes on-chip address/data latches, high-voltage generator, and Y/X decoders driving a 32-kword MNOS memory array.
It supports three write modes: standard byte write (≤10 ms), automatic page write (1–64 bytes, ≤10 ms total), and software data protection (SDP) enabled via 3-byte unlock sequence (5555h/AAh → 2AAAh/55h → 5555h/A0h). Data polling (I/O7 toggle) and toggle-bit (I/O6) provide write status feedback without RDY/Busy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 kbit (32,768 × 8-bit), directly replaceable for 32-kword firmware/config storage in legacy 8-bit microcontroller systems. |
| Access time | 85 ns max - ensures timing compatibility with 12 MHz Z80, 8051, or 68K-based controllers using standard wait-state logic. |
| Supply voltage | 4.5–5.5 V - matches standard 5 V TTL/CMOS bus environments without level-shifting requirements. |
| Write endurance | 10⁵ cycles (page mode), 10⁴ cycles (byte mode) - supports field-updatable calibration tables with >10-year service life at ≤10 writes/day. |
| Standby current | 110 µW max - enables battery-backed operation in low-power industrial sensors with <1 µA system sleep budget. |
| Data retention | ≥10 years - validated under JEDEC JESD22-A117 conditions, suitable for unattended infrastructure equipment. |
| Package | 28-pin plastic TSOP (PTSA0028ZB-A, TFP-28DBV), 8.0 × 11.8 mm footprint - compatible with space-constrained PCB layouts requiring surface-mount EEPROMs. |
Pinout & Package
HN58C256AT85E uses a 28-pin plastic TSOP (JEITA code PTSA0028ZB-A, Renesas code TFP-28DBV), 8.0 mm × 11.8 mm body, 0.55 mm pitch, lead-free finish.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1–14, 15–28 | Address (A0–A14), I/O (I/O0–I/O7), Control (CE, OE, WE), Power (VCC, VSS) | Standard JEDEC byte-wide parallel interface: A0–A14 decode 32k addresses; I/O0–I/O7 bidirectional data bus; CE/OE/WE enable read/write; VCC/VSS supply rails. |
| A0–A14 | Address input | 15-bit address bus latched on CE or WE falling edge - supports full 32k-word addressing without external latch logic. |
| I/O0–I/O7 | Data input/output | Bidirectional 8-bit data bus with tristate output drivers - interfaces directly to 8-bit microprocessor data buses (e.g., 8051, Z80, 68000). |
| CE | Chip enable | Active-low chip select - enables device when low; high-Z outputs when high, allowing multi-device bus sharing. |
| OE | Output enable | Active-low read strobe - controls output drivers independently of CE, enabling output gating during burst reads. |
| WE | Write enable | Active-low write strobe - initiates byte or page write on rising edge; latches address/data per JEDEC timing. |
| VCC | Power supply | +5 V supply pin - requires local 0.1 µF ceramic decoupling within 5 mm to meet AC noise immunity specs. |
| VSS | Ground | Signal ground reference - must be connected to system ground plane with low-inductance path to minimize write errors. |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte page write | Reduces firmware update time by 64× vs. byte writes - enables full sector reprogramming in ≤10 ms without host CPU intervention. |
| Software data protection (SDP) | Prevents accidental writes via 3-byte unlock sequence (5555h/AAh → 2AAAh/55h → 5555h/A0h) - eliminates need for hardware WP pin in cost-sensitive designs. |
| Data polling & toggle bit | I/O7 inversion and I/O6 toggling provide real-time write completion feedback - replaces RDY/Busy pin functionality required in HN58C257A. |
| MNOS memory cell | Enables 10⁵ write cycles and 10-year data retention at 85°C - exceeds standard EEPROM reliability for industrial temperature range (0 to +70°C). |
| JEDEC byte-wide compliance | Guarantees interoperability with legacy 8-bit microcontrollers and FPGA-based memory controllers using standard parallel bus protocols. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Tables |
|---|---|
|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during boot and runtime via 8-bit parallel bus; 85 ns access enables real-time parameter updates without CPU wait states. Use Value: Eliminates battery-backed SRAM; 10⁵ write cycles support daily firmware updates over 27 years; TSOP package fits compact controller PCBs. |
Use Scenario: Retaining sensor offset/gain coefficients and patient-specific therapy settings in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure parameter storage with SDP-enabled write locking - prevents corruption during power cycling or ESD events. Use Value: 10-year data retention meets IEC 62304 Class B software lifecycle requirements; 110 µW standby current extends battery life in handheld units. |
| Automotive Body Control Module (BCM) | Networking Equipment Bootloader Storage |
|
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock configurations in 12 V automotive BCMs. IC Role / Device Role / Timing Role: Directly interfaced to 8-bit MCU (e.g., RL78/G13) via parallel bus; withstands 4.5–5.5 V supply variation during cold-crank conditions. Use Value: MNOS cell technology ensures operation across −20 to +85°C ambient; no RES/RDY pins simplifies layout versus HN58C257A. |
Use Scenario: Holding bootloader images and MAC address tables in managed Ethernet switches and wireless access points. IC Role / Device Role / Timing Role: Primary boot memory mapped into MCU address space; page write enables fast field upgrades of firmware partitions. Use Value: 64-byte page programming reduces OTA update time by >98% vs. byte writes; JEDEC compliance guarantees drop-in replacement for legacy EEPROMs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C256-15PU | 150 ns access time, 28-pin PDIP only, no page write, 10⁴ write cycles | Lacks page programming and SDP; requires hardware write protect; slower timing limits use with >6.7 MHz MCUs | Select when legacy DIP socket compatibility is mandatory and write speed is not critical. |
| BR24T256FJ-WE2 | I²C interface, 400 kHz, 8-pin SOP, 10⁶ write cycles, 40 µA standby | Serial interface reduces pin count but adds protocol overhead; incompatible with parallel bus systems | Choose for new designs prioritizing board space savings and ultra-low power, accepting I²C software stack integration. |
Compared with AT28C256-15PU and BR24T256FJ-WE2, the HN58C256AT85E uniquely balances 85 ns parallel access, 64-byte page write, and SDP in a TSOP-28 package - making it optimal for retrofitting legacy 8-bit systems requiring faster, more reliable EEPROM upgrades without bus architecture changes.
Availability
HN58C256AT85E is available at Aetrix Electronics and suitable for industrial PLCs, medical calibration systems, and automotive body control modules requiring stable component supply with long-term lifecycle assurance.
Supply support for HN58C256AT85E 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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and IoT applications.
The HN58C256A series was designed as a high-reliability, low-power parallel EEPROM family targeting legacy 8-bit system upgrades and industrial equipment requiring robust nonvolatile storage with JEDEC-compliant timing.
FAQ
What is the maximum operating temperature range for the HN58C256AT85E?
The HN58C256AT85E is rated for 0 to +70°C operation per its Recommended DC Operating Conditions. Industrial-grade variants (e.g., HN58C256AT85E-IND) support −20 to +85°C, but the base HN58C256AT85E part is specified only for commercial temperature range. Always verify ambient thermal design margins against this 70°C limit in enclosed enclosures.
Does the HN58C256AT85E support Ready/Busy or RES pin functionality?
No, the HN58C256AT85E does not implement Ready/Busy or RES pins - these features are exclusive to the HN58C257A series (e.g., HN58C257AT85E). The HN58C256AT85E relies on data polling (I/O7) and toggle-bit (I/O6) for write status indication and uses software data protection instead of hardware reset-based write inhibit.
How is software data protection (SDP) enabled on the HN58C256AT85E?
SDP is enabled on the HN58C256AT85E by writing three specific address/data sequences: first write 0xAA to address 0x5555, then 0x55 to address 0x2AAA, then 0xA0 to address 0x5555. Only after this full sequence is completed will subsequent writes be accepted. The device ships with SDP disabled.
What package type and dimensions does the HN58C256AT85E use?
The HN58C256AT85E uses a 28-pin plastic TSOP (thin small-outline package) with JEITA code PTSA0028ZB-A and Renesas code TFP-28DBV. Its body measures 8.0 mm × 11.8 mm, with 0.55 mm pin pitch and lead-free finish - compliant with RoHS and JEDEC MO-153 standards.
Can the HN58C256AT85E be used as a direct replacement for the HN58C256AP85E?
Yes, the HN58C256AT85E is functionally identical to the HN58C256AP85E except for package: both share identical electrical specifications, timing, pinout, and feature set. The "T" suffix denotes TSOP packaging (surface-mount), while "P" indicates PDIP (through-hole). PCB layout must accommodate the different footprints, but no schematic or firmware changes are needed.
HN58C256AT85E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- -
- Memory Format:
- -
- Technology:
- -
- Memory Size:
- -
- Memory Organization:
- -
- Memory Interface:
- -
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
HN58C256AT85E FAQ
1.How can I place an order for HN58C256AT85E through Aetrix?
Please submit a Request for Quotation (RFQ) for HN58C256AT85E 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 HN58C256AT85E reliable?
The price and inventory of HN58C256AT85E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HN58C256AT85E is usually 5 days.
3.What payment methods are accepted for HN58C256AT85E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HN58C256AT85E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HN58C256AT85E?
HN58C256AT85E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HN58C256AT85E 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 HN58C256AT85E?
For technical support, including HN58C256AT85E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HN58C256AT85E requirements.
6.How does Aetrix verify that HN58C256AT85E is sourced from the original manufacturer or authorized distributors?
All HN58C256AT85E 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 HN58C256AT85E meets industry standards.
7.What is the process for return or replacement of HN58C256AT85E?
All HN58C256AT85E units undergo pre-shipment inspection (PSI). If there is an issue with HN58C256AT85E, 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 HN58C256AT85E part is unused and in its original packaging.
Return procedure for HN58C256AT85E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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