My Inquiry
My Account
Microchip Technology AT28HC64B-12SU
- Part No.:
- AT28HC64B-12SU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AT28HC64B-12SU.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:122
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT28HC64B-12SU from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 120 ns maximum read access time, hardware/software data protection, and page write capability supporting up to 64-byte writes in ≤10 ms. It operates from a single 5 V ±10% supply and targets firmware storage, configuration memory, and calibration data retention in industrial control systems.
For engineers reviewing the AT28HC64B-12SU datasheet, AT28HC64B-12SU pinout, AT28HC64B-12SU application, or AT28HC64B-12SU equivalent, key selection criteria include verified page write timing (10 ms max), CMOS/TTL I/O compatibility, DATA polling and toggle bit write completion detection, industrial temperature range (–40°C to +85°C), and green SOIC-28 packaging.
Technical Context
The AT28HC64B-12SU implements a parallel interface with independent CE/OE/WE controls enabling SRAM-like read/write cycles without external timing logic. Its internal 64-byte page register latches address and data during page write operations, freeing the bus for concurrent system activity.
Write completion is confirmed via dual methods: DATA polling on I/O7 (complement-to-data during write, true data after completion) and toggle-bit behavior on I/O6 (toggling during write, stable after completion). Hardware protection includes VCC sense (<3.8 V inhibits write), 5 ms power-on delay, and noise filtering on WE/CE inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8), sufficient for boot code or multi-parameter calibration tables |
| Read Access Time | 120 ns max - meets timing budgets for 8-bit microcontroller interfaces at ≤8 MHz |
| Page Write Cycle | 10 ms max - enables efficient bulk updates without CPU blocking |
| VCC Supply | 5 V ±10% - compatible with legacy 5 V logic rails and eliminates need for level shifters |
| Standby Current | 100 µA CMOS - supports low-power modes in battery-backed systems |
| Endurance | 100,000 write/erase cycles - suitable for field-updatable firmware with infrequent revisions |
| Data Retention | 10 years - ensures long-term reliability in unattended industrial deployments |
Pinout & Package
AT28HC64B-12SU is packaged in a 28-lead, 0.300" wide plastic gull-wing small outline (SOIC-28), JEDEC MS-013 compliant, with green (Pb/halide-free) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus selecting one of 8,192 bytes; A6–A12 define page boundaries for page write |
| I/O0–I/O7 | Bidirectional Data Bus | CMOS/TTL-compatible 8-bit data path; supports DATA polling on I/O7 and toggle bit on I/O6 |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read; used with WE for write initiation |
| OE | Output Enable | Active-low output control; high during write to prevent bus contention; required high for page write |
| WE | Write Enable | Active-low write strobe; falling edge latches address; rising edge latches data in byte/page mode |
| GND / VCC | Power Terminals | Ground reference and 5 V supply; decoupling capacitor placement critical for stable page write timing |
| NC | No Connect | Pins 1 and 14 are unconnected; must remain floating per datasheet - not tied to GND/VCC |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC Byte-wide Pinout | Direct drop-in replacement for industry-standard 28-pin parallel EEPROMs and SRAMs in existing PCB layouts |
| 64-byte Page Write | Reduces firmware update time by >90% vs. byte-write - 64 bytes written in single 10 ms cycle instead of 64 × ~10 ms |
| Hardware + Software Data Protection | VCC sensing, 5 ms power-on delay, and 3-byte SDP command sequence prevent accidental writes during power transitions or debug sessions |
| DATA Polling & Toggle Bit | Eliminates need for fixed delays or external timers - host CPU detects write completion dynamically via I/O7 or I/O6 |
| Industrial Temperature Range | –40°C to +85°C operation validated - supports deployment in motor drives, PLCs, and outdoor metering equipment |
Applications
| Industrial PLC Configuration Storage | Firmware Bootloader Memory |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during startup and runtime; reads occur at system initialization, writes only during commissioning or parameter updates. Use Value: 100,000-cycle endurance and 10-year data retention ensure reliable operation over full equipment lifecycle without recalibration or reprogramming. | Use Scenario: Holding bootloader code that validates and loads application firmware from external flash or serial EEPROM into microcontroller RAM. IC Role / Device Role / Timing Role: Primary boot memory mapped to reset vector; read-accessed within first 120 ns of power-on reset to initiate secure boot sequence. Use Value: 5 V compatibility and SRAM-like interface eliminate glue logic, reducing BOM cost and board space versus SPI-based alternatives. |
| Calibration Data Archive | Smart Sensor Node Identity |
Use Scenario: Recording factory-calibrated sensor offsets, gain coefficients, and linearity corrections in pressure transmitters and flow meters. IC Role / Device Role / Timing Role: Write-once or infrequent-write nonvolatile storage; data integrity protected by hardware VCC-sense and software data protection during field recalibration. Use Value: Extra 64-byte ID sector (accessible via 12 V on A9) enables unique device serialization and traceability across production batches. | Use Scenario: Embedding MAC addresses, cryptographic keys, and manufacturing date codes in wireless sensor nodes for IoT edge devices. IC Role / Device Role / Timing Role: Secure identity store isolated from main memory array; accessed only during secure boot or key derivation routines. Use Value: Dual write-detection methods (DATA polling + toggle bit) guarantee atomic key writes - no partial writes or corruption during brown-out conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C64B-12SU | Same pinout, 120 ns speed grade, but lacks software data protection (SDP) and extra 64-byte ID sector | Suitable for cost-sensitive designs where write protection is handled externally or unnecessary | Select AT28C64B-12SU only if SDP and device ID features are unused - otherwise AT28HC64B-12SU provides superior security and traceability |
| MX28F640J3F-12G | 64 Mbit Flash (not EEPROM); requires block erase before write; no page write or DATA polling | Used in high-density firmware storage where infrequent updates justify erase latency and complexity | Not interchangeable - MX28F640J3F-12G requires different driver software, erase management, and timing handling; choose only for capacity-driven upgrades |
Compared with AT28C64B-12SU, the AT28HC64B-12SU adds software data protection and device ID memory without changing footprint or timing; versus MX28F640J3F-12G, it offers true byte/page EEPROM functionality with deterministic write times and no erase overhead - critical for real-time configuration updates.
Availability
AT28HC64B-12SU is available at Aetrix Electronics and suitable for industrial control systems, embedded bootloader implementations, sensor calibration storage, and smart device identity management requiring stable component supply across extended product lifecycles.
Supply support for AT28HC64B-12SU 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT28HC64B product line delivers high-reliability parallel EEPROMs optimized for industrial and automotive-qualified applications demanding robust data retention, fast page writes, and integrated hardware/software write protection.
FAQ
What is the maximum page write cycle time for AT28HC64B-12SU?
The AT28HC64B-12SU has a maximum page write cycle time of 10 ms under standard operation. This value is guaranteed across the full industrial temperature range (–40°C to +85°C) and applies to all 1–64 byte writes within a single page. The datasheet notes an optional faster variant (AT28HC64BF) achieves 2 ms, but AT28HC64B-12SU itself is rated at 10 ms maximum.
Does AT28HC64B-12SU support both hardware and software data protection?
Yes, AT28HC64B-12SU integrates dual-layer protection: hardware features include VCC sensing (<3.8 V disables writes), 5 ms power-on delay, and noise filtering on WE/CE inputs; software data protection (SDP) is enabled/disabled via a documented 3-byte command sequence written to specific addresses (1555H, 0AAAH, then 1555H), and remains active through power cycles.
Can AT28HC64B-12SU be used as a direct replacement for standard SRAM in existing designs?
AT28HC64B-12SU supports SRAM-like read access and shares JEDEC-standard byte-wide pinout, but differs critically in write behavior: it requires WE/CE/OE handshaking and internal timing for writes, unlike volatile SRAM. It is not a drop-in SRAM replacement - however, it *is* a pin-compatible upgrade path from older parallel EEPROMs like AT28C64B-12SU when software data protection or device ID features are needed.
How is write completion detected on AT28HC64B-12SU?
AT28HC64B-12SU provides two independent, hardware-verified methods: DATA polling monitors I/O7 (complement of last written data during write, true data after completion), and the toggle bit monitors I/O6 (toggles between 0/1 during write, stabilizes after completion). Both methods allow the host processor to poll asynchronously without fixed delays or external timers.
What package type does AT28HC64B-12SU use, and is it RoHS-compliant?
AT28HC64B-12SU uses a 28-lead, 0.300" wide plastic gull-wing small outline (SOIC-28) package, designated as "28S" in Atmel's ordering matrix. It is manufactured with green (Pb/halide-free) packaging per JEDEC standards and fully complies with RoHS Directive 2011/65/EU and related environmental regulations.
AT28HC64B-12SU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT28HC64B-12SU FAQ
1.How can I place an order for AT28HC64B-12SU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28HC64B-12SU 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 AT28HC64B-12SU reliable?
The price and inventory of AT28HC64B-12SU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28HC64B-12SU is usually 5 days.
3.What payment methods are accepted for AT28HC64B-12SU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28HC64B-12SU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28HC64B-12SU?
AT28HC64B-12SU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28HC64B-12SU 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 AT28HC64B-12SU?
For technical support, including AT28HC64B-12SU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28HC64B-12SU requirements.
6.How does Aetrix verify that AT28HC64B-12SU is sourced from the original manufacturer or authorized distributors?
All AT28HC64B-12SU 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 AT28HC64B-12SU meets industry standards.
7.What is the process for return or replacement of AT28HC64B-12SU?
All AT28HC64B-12SU units undergo pre-shipment inspection (PSI). If there is an issue with AT28HC64B-12SU, 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 AT28HC64B-12SU part is unused and in its original packaging.
Return procedure for AT28HC64B-12SU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28HC64B-12SU Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
