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Microchip Technology AT28BV64B-20SC
- Part No.:
- AT28BV64B-20SC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AT28BV64B-20SC.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,201
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Product details
Overview
AT28BV64B-20SC from Microchip Technology (formerly Atmel) is a 64 Kbit (8K × 8) parallel EEPROM with battery-voltage operation (2.7V–3.6V), 200 ns read access time, and hardware/software data protection. It supports page write (1–64 bytes), DATA polling, and toggle-bit write completion detection for embedded nonvolatile storage in industrial control and instrumentation systems.
For engineers reviewing the AT28BV64B-20SC datasheet, AT28BV64B-20SC pinout, AT28BV64B-20SC application, or AT28BV64B-20SC equivalent, key selection criteria include JEDEC byte-wide pin compatibility, 20 µA CMOS standby current, 100,000 write endurance, software data protection (SDP) command sequence, and SOIC-28 packaging for commercial temperature range (0°C to 70°C).
Technical Context
The AT28BV64B-20SC implements a static RAM-compatible parallel interface with dual-line chip enable (CE) and output enable (OE) control to prevent bus contention. Its internal 64-byte page register latches address and data during page writes, decoupling the host bus for concurrent operations.
Write completion is verified via I/O7 DATA polling (complement-to-true transition) or I/O6 toggle-bit behavior, both usable at any point during tWC (≤10 ms). Software Data Protection requires a three-byte command sequence (AAh→55h→A0h at specific addresses) before each write, preventing corruption during power transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 words × 8 bits); sufficient for firmware patch storage or configuration logging in resource-constrained systems. |
| Read Access Time | 200 ns max; enables direct replacement of SRAM in legacy 8-bit microcontroller interfaces without timing redesign. |
| Page Write Cycle | ≤10 ms; allows burst programming of up to 64 bytes with single command initiation, reducing host CPU overhead. |
| Endurance | 100,000 write/erase cycles; supports field-updatable calibration data in industrial sensors with multi-year service life. |
| Data Retention | 10 years at 85°C; ensures long-term integrity of stored device identifiers or security keys without refresh. |
| Supply Voltage | 2.7V–3.6V; compatible with single-cell Li-ion or 3.3V logic rails, eliminating level-shifting in portable equipment. |
| Standby Current | 20 µA (CMOS); enables always-on configuration storage in battery-backed systems with minimal drain. |
Pinout & Package
AT28BV64B-20SC is supplied in a 28-lead, 0.300" wide plastic gull-wing small outline (SOIC) package per JEDEC MS-013, with 1.27 mm pitch and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus selecting one of 8,192 memory locations; A6–A12 define page boundaries for 64-byte writes. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface supporting read, byte write, and page write; high-impedance when CE or OE is inactive. |
| CE | Chip Enable | Active-low global select; disables outputs and inhibits writes when high, enabling multi-device bus sharing. |
| OE | Output Enable | Active-low read control; places outputs in high-Z state when high, preventing bus conflicts during writes. |
| WE | Write Enable | Active-low write strobe; initiates byte or page write on falling edge; must be coordinated with CE per AC timing specs. |
| VCC / GND | Power Supply | Single 2.7–3.6V supply with 20 µA standby draw; no separate VPP required for standard operation. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC Byte-wide Pinout | Ensures drop-in compatibility with legacy 28-pin parallel EEPROMs and SRAMs in existing PCB layouts. |
| Software Data Protection (SDP) | Requires mandatory 3-byte unlock sequence (1555h/0AAAh/1555h/A0h) before each write, eliminating accidental overwrites during power ramp. |
| Hardware Write Inhibit | Automatic 10 ms VCC delay + noise filtering (<15 ns pulses rejected) + CE/OE/WE gating prevents spurious writes. |
| 64-byte Page Register | Latches full page data internally, freeing address/data bus for other tasks while write executes autonomously. |
| DATA Polling & Toggle Bit | Dual asynchronous write-complete detection methods (I/O7 complement, I/O6 toggle) eliminate need for fixed delays or external timers. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables and alarm thresholds in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via 8-bit microcontroller parallel bus; 200 ns read latency meets real-time scan cycle requirements. Use Value: 100,000-cycle endurance and 10-year data retention ensure reliable operation across decades of maintenance-free deployment. | Use Scenario: Holding patient-specific calibration coefficients and sensor offset values in portable diagnostic instruments with battery backup. IC Role / Device Role / Timing Role: Low-power (20 µA standby) EEPROM interfaced to MCU during boot; SDP prevents corruption during frequent power cycling. Use Value: Single 2.7–3.6V supply eliminates voltage translation, simplifying power architecture in compact handheld enclosures. |
| Automotive ECU Parameter Tables | Point-of-Sale Terminal Firmware Patches |
Use Scenario: Storing adaptive learning parameters (e.g., fuel trim, idle speed) in engine control units exposed to -40°C to 85°C thermal cycling. IC Role / Device Role / Timing Role: Industrial-grade (–40°C to +85°C) parallel EEPROM with page write for efficient parameter updates during reprogramming. Use Value: Hardware write inhibit and SDP jointly prevent corruption during vehicle battery transients or ignition noise events. | Use Scenario: Hosting minor firmware patches and localization strings in retail payment terminals requiring field-upgradable code without full flash reprogramming. IC Role / Device Role / Timing Role: External parallel EEPROM mapped into MCU address space; 200 ns access enables zero-wait-state execution of patch routines. Use Value: JEDEC pinout allows reuse of existing PCB footprints designed for legacy 28-pin EEPROMs, minimizing NRE cost for product variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C64B-20SC | 5V-only supply (4.5–5.5V); no battery-voltage operation; identical 64K × 8 organization and SOIC-28 pinout. | Requires 5V rail; unsuitable for 3.3V-only systems but offers higher noise immunity in electrically noisy industrial settings. | Select AT28C64B-20SC only if system already uses 5V logic and board layout cannot accommodate voltage translation. |
| ST M28W640ECB90N1Z | 64 Mbit (8M × 8) capacity; 90 ns access; 3.0–3.6V supply; different pinout (32-pin TSOP) and command set. | Higher density for firmware storage; not pin-compatible; requires PCB redesign and firmware driver changes. | Choose ST M28W640ECB90N1Z only when >64K storage is needed and migration effort is justified by feature gain. |
Compared with AT28C64B-20SC, the AT28BV64B-20SC enables direct integration into 3.3V systems without level shifters, while its software data protection provides stronger safeguards against power-related corruption than the AT28C64B's hardware-only protection-critical for battery-powered devices.
Availability
AT28BV64B-20SC is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, and automotive ECU applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AT28BV64B-20SC 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
Microchip Technology acquired Atmel in 2016 and maintains its legacy parallel EEPROM portfolio for industrial and automotive reliability-critical applications.
The AT28BV64B product line delivers battery-voltage, page-write EEPROMs optimized for legacy 8-bit microcontroller interfaces where pin compatibility, low-power standby, and robust data protection are mandatory.
FAQ
What is the maximum write cycle time for AT28BV64B-20SC during page write operations?
The AT28BV64B-20SC has a maximum page write cycle time of 10 ms, as specified in the AC characteristics table. This applies to all page writes (1–64 bytes) and is governed by the internal control timer. The device automatically completes the write without host intervention after this period, and completion can be confirmed via DATA polling on I/O7 or toggle-bit monitoring on I/O6.
Does AT28BV64B-20SC require a high-voltage programming signal for normal operation?
No, the AT28BV64B-20SC operates with a single 2.7V–3.6V supply and does not require high-voltage (e.g., 12V) signals for standard read/write operations. Only the optional 64-byte device identification area (7FC0h–7FFFh) requires 12.0V ± 0.5V applied to A9, which is isolated from routine memory access. All main array writes use standard VCC-level signaling.
How does the Software Data Protection (SDP) feature work on AT28BV64B-20SC?
The AT28BV64B-20SC requires a precise three-byte unlock sequence-writing AAh to address 1555h, 55h to address 0AAAh, then A0h to address 1555h-before any byte or page write. This SDP mechanism prevents accidental writes during power-up/down or noise events. Without this sequence, the device ignores data writes but still consumes tWC time, during which reads return polling responses instead of valid data.
What package type and dimensions does AT28BV64B-20SC use?
The AT28BV64B-20SC uses a 28-lead plastic gull-wing small outline (SOIC) package per JEDEC MS-013, measuring 17.7–18.1 mm in length, 7.4–7.6 mm in width, and 2.35–2.65 mm in height. It features 1.27 mm lead pitch, 0.300" body width, and surface-mount compatibility with standard reflow profiles for lead-free assembly.
Can AT28BV64B-20SC be used in industrial temperature environments?
Yes, the AT28BV64B-20SC is rated for industrial temperature operation (–40°C to +85°C) when ordered with the 'I' suffix (e.g., AT28BV64B-20SI). The 'SC' suffix denotes SOIC packaging but does not specify temperature grade; the full part number determines the operating range. Always verify the complete ordering code (e.g., AT28BV64B-20SI) for industrial qualification.
AT28BV64B-20SC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not 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:
- 200 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT28BV64B-20SC FAQ
1.How can I place an order for AT28BV64B-20SC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28BV64B-20SC 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 AT28BV64B-20SC reliable?
The price and inventory of AT28BV64B-20SC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28BV64B-20SC is usually 5 days.
3.What payment methods are accepted for AT28BV64B-20SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28BV64B-20SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28BV64B-20SC?
AT28BV64B-20SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28BV64B-20SC 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 AT28BV64B-20SC?
For technical support, including AT28BV64B-20SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28BV64B-20SC requirements.
6.How does Aetrix verify that AT28BV64B-20SC is sourced from the original manufacturer or authorized distributors?
All AT28BV64B-20SC 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 AT28BV64B-20SC meets industry standards.
7.What is the process for return or replacement of AT28BV64B-20SC?
All AT28BV64B-20SC units undergo pre-shipment inspection (PSI). If there is an issue with AT28BV64B-20SC, 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 AT28BV64B-20SC part is unused and in its original packaging.
Return procedure for AT28BV64B-20SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28BV64B-20SC Tags
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