My Inquiry
My Account
Microchip Technology AT28BV64B-20SU
- Part No.:
- AT28BV64B-20SU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AT28BV64B-20SU.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:166
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The AT28BV64B-20SU from Atmel is a 64K-bit (8K × 8) parallel EEPROM with battery-voltage operation (2.7V–3.6V), 200 ns read access time, 10 ms maximum page write cycle, hardware/software data protection, and JEDEC-approved byte-wide pinout in a 28-lead SOIC package. It supports automatic 1–64 byte page writes and operates across industrial temperature range (−40°C to +85°C) for embedded system configuration storage.
For engineers reviewing the AT28BV64B-20SU datasheet, AT28BV64B-20SU pinout, AT28BV64B-20SU application, or AT28BV64B-20SU equivalent, key selection criteria include its 200 ns read timing, 10 ms page write performance, CMOS standby current <20 µA, software data protection command sequence, and compatibility with static RAM-like bus interface without external timing logic.
Technical Context
The AT28BV64B-20SU implements a parallel EEPROM architecture with internal 64-byte page register and autonomous write control timer. Its dual-line chip enable (CE) and output enable (OE) logic enables bus contention avoidance, while DATA polling on I/O7 and toggle bit detection on I/O6 provide deterministic end-of-write signaling.
Software Data Protection requires a three-byte command sequence (0xAA→0x55→0xA0 at addresses 0x1555/0x0AAA/0x1555) before each write operation. The device also includes 64 bytes of dedicated identification memory accessible via A9 = 12 V, and supports both WE- and CE-controlled write modes per JEDEC-standard timing waveforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8), organized as byte-addressable parallel array |
| Read Access Time | 200 ns - enables direct replacement of SRAM in legacy 8-bit microcontroller systems |
| Page Write Cycle | ≤10 ms - allows burst programming of up to 64 bytes without host CPU intervention |
| VCC Supply Range | 2.7 V to 3.6 V - compatible with 3.3 V logic rails and battery-backed operation |
| Standby Current | <20 µA - supports low-power retention in always-on embedded controllers |
| Endurance | 100,000 write/erase cycles - suitable for infrequent firmware parameter updates |
| Data Retention | 10 years at 85°C - ensures long-term reliability in industrial environments |
Pinout & Package
AT28BV64B-20SU is supplied in a 28-lead, 0.300" wide plastic gull-wing small outline integrated circuit (SOIC) package per JEDEC MS-013, with 1.27 mm lead pitch and industrial-grade thermal profile (−40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K-word addressing; A6–A12 define page boundaries for 64-byte writes |
| I/O0–I/O7 | Bidirectional Data Bus | Byte-wide parallel interface; I/O7 used for DATA polling, I/O6 for toggle-bit status |
| CE | Chip Enable | Active-low global select; must be low with OE low and WE high for read access |
| OE | Output Enable | Active-low output control; enables high-impedance state when high to prevent bus contention |
| WE | Write Enable | Active-low write strobe; falling edge latches address and initiates byte/page write sequence |
| NC | No Connect | Two pins (1 and 17) are unconnected; must remain floating per datasheet |
| VCC, GND | Power Supply | Single 2.7–3.6 V supply; decoupling capacitor required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection (SDP) | Three-step command sequence prevents accidental writes during power-up/down or noise events |
| Automatic Page Write | Internal 64-byte latch and timer eliminate need for external write timing control logic |
| DATA Polling & Toggle Bit | Dual asynchronous write-completion detection methods reduce polling overhead and improve system responsiveness |
| JEDEC Byte-wide Pinout | Pin-compatible with industry-standard EPROM/EEPROM families, easing board-level upgrades |
| Industrial Temperature Range | Guaranteed operation from −40°C to +85°C supports deployment in harsh environmental conditions |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via 8-bit parallel bus during boot and runtime reconfiguration. Use Value: 200 ns read access enables real-time parameter recall without CPU wait states; 100,000-cycle endurance supports decades of field updates. | Use Scenario: Retaining sensor calibration coefficients, patient history flags, and safety-critical operational limits in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, low-power EEPROM providing tamper-resistant storage for regulatory-compliant device settings. Use Value: Software data protection prevents corruption during brown-out events; 10-year data retention meets FDA Class II device lifecycle requirements. |
| Telecom Base Station Bootloader Parameters | Automotive Body Control Module Settings |
Use Scenario: Holding MAC addresses, RF channel plans, and firmware version metadata in wireless infrastructure equipment operating continuously at elevated ambient temperatures. IC Role / Device Role / Timing Role: Industrial-grade parallel EEPROM interfaced directly to microcontroller's external memory bus. Use Value: −40°C to +85°C rating ensures reliability in outdoor enclosures; <20 µA standby current minimizes backup battery drain. | Use Scenario: Saving user preferences (window positions, mirror angles), fault logs, and CAN node configuration in automotive body electronics modules. IC Role / Device Role / Timing Role: Battery-voltage EEPROM retaining settings during ignition-off periods using vehicle's 3.3 V rail or backup supply. Use Value: 2.7–3.6 V operation matches automotive LDO outputs; page write reduces update latency versus byte-by-byte programming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip 28C64C-20/P | 5V-only operation (4.5–5.5 V); no software data protection; 250 ns access time | Limited to 5 V systems; lacks SDP and fast page write; higher active current (25 mA) | Select only if legacy 5 V design mandates voltage compatibility and write security is handled externally |
| ON Semiconductor CAT28C64B-20TE13 | Same 2.7–3.6 V range and 200 ns timing; identical JEDEC pinout; no device ID memory | Matches AT28BV64B-20SU electrical and mechanical specs but omits 64-byte ID area and 12 V A9 programming | Drop-in alternative where device identification functionality is not required |
Compared with Microchip 28C64C-20/P and ON Semiconductor CAT28C64B-20TE13, the AT28BV64B-20SU uniquely combines battery-voltage operation, software data protection, and integrated device ID memory-making it optimal for secure, low-power, field-upgradable embedded systems requiring guaranteed write integrity.
Availability
AT28BV64B-20SU is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, telecom base stations, and automotive body control modules requiring stable component supply, long-term lifecycle support, and green (Pb/halide-free) packaging.
Supply support for AT28BV64B-20SU 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, designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets before its 2016 acquisition.
The AT28BV64B product line delivers battery-voltage parallel EEPROMs optimized for legacy 8-bit system upgrades, offering pin-compatible replacements for EPROMs and earlier EEPROMs with enhanced data security and low-power operation.
FAQ
What is the correct software data protection (SDP) sequence for AT28BV64B-20SU?
The AT28BV64B-20SU requires a precise three-byte SDP command sequence before any write: first write 0xAA to address 0x1555, then 0x55 to address 0x0AAA, then 0xA0 to address 0x1555. Only after this sequence is completed will subsequent byte or page writes be accepted. The AT28BV64B-20SU ignores writes without this sequence and enters polling mode instead of programming.
Does AT28BV64B-20SU support true 3.3 V operation without level shifting?
Yes, the AT28BV64B-20SU operates natively across 2.7 V to 3.6 V, making it fully compatible with standard 3.3 V logic families without level translation. Its VIH threshold is 2.0 V minimum and VIL is 0.6 V maximum, ensuring robust interfacing with 3.3 V microcontrollers and FPGAs. The AT28BV64B-20SU draws only 15 mA active current at 3.3 V, minimizing power supply loading.
How does page write work on AT28BV64B-20SU, and what is the maximum page size?
The AT28BV64B-20SU supports page writes of 1 to 64 bytes within the same 64-byte boundary defined by address bits A6–A12. Each byte must be loaded within 100 µs of the prior one (tBLC); exceeding this window triggers internal programming. The AT28BV64B-20SU uses an internal latch and timer to complete the entire page write autonomously in ≤10 ms, freeing the bus for other operations during programming.
Can AT28BV64B-20SU be used as a direct replacement for older 28C64B EPROMs?
No - the AT28BV64B-20SU is an EEPROM, not an EPROM, and requires no UV erasure or programming voltage beyond VCC. While it shares JEDEC byte-wide pinout and 8K×8 organization with 28C64B, it differs electrically: AT28BV64B-20SU uses 2.7–3.6 V (not 5 V), has software data protection, and supports page writes. Direct substitution requires verifying voltage compatibility and updating write routines for SDP and polling.
What is the purpose of the 64-byte device identification area in AT28BV64B-20SU?
The AT28BV64B-20SU includes 64 bytes of dedicated EEPROM space (addresses 0x0000–0x003F) accessible only when A9 is raised to 12.0 V ± 0.5 V. This area stores unique device identifiers, calibration data, or manufacturing traceability information independent of main memory. The AT28BV64B-20SU retains this data for 10 years and supports 100,000 write cycles, enabling secure, field-programmable device tagging.
AT28BV64B-20SU 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:
- 200 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT28BV64B-20SU FAQ
1.How can I place an order for AT28BV64B-20SU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28BV64B-20SU 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-20SU reliable?
The price and inventory of AT28BV64B-20SU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28BV64B-20SU is usually 5 days.
3.What payment methods are accepted for AT28BV64B-20SU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28BV64B-20SU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28BV64B-20SU?
AT28BV64B-20SU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28BV64B-20SU 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-20SU?
For technical support, including AT28BV64B-20SU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28BV64B-20SU requirements.
6.How does Aetrix verify that AT28BV64B-20SU is sourced from the original manufacturer or authorized distributors?
All AT28BV64B-20SU 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-20SU meets industry standards.
7.What is the process for return or replacement of AT28BV64B-20SU?
All AT28BV64B-20SU units undergo pre-shipment inspection (PSI). If there is an issue with AT28BV64B-20SU, 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-20SU part is unused and in its original packaging.
Return procedure for AT28BV64B-20SU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28BV64B-20SU 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…
