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Microchip Technology AT49BV320-90TI
- Part No.:
- AT49BV320-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV320-90TI.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,094
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Product details
Overview
AT49BV320-90TI from Microchip Technology (formerly Atmel) is a 32-Mbit (2M × 16 / 4M × 8) single-supply 3.0V Flash memory IC used for nonvolatile code and data storage in embedded systems. It features 85 ns access time, sector erase architecture with 71 independently lockable sectors (63 × 64 KB + 8 × 8 KB), 15 µs word program time, and suspend/resume capability for concurrent read/program operations during erase. It is commonly deployed in industrial controllers and boot memory applications requiring in-system reprogrammability.
For engineers reviewing the AT49BV320-90TI datasheet, AT49BV320-90TI pinout, AT49BV320-90TI application, or AT49BV320-90TI equivalent, key selection considerations include its TSOP-48 package, x16/x8 configurable interface (fixed word mode per this variant), VPP-based hardware write protection, 128-bit protection register, and compatibility with standard microprocessor bus timing without external clocks.
Technical Context
The AT49BV320-90TI implements a command-register-based Flash architecture with internal state machine control for erase and program operations. It supports six-byte software command sequences (e.g., Chip Erase, Sector Erase, Sector Lockdown) latched via WE/CE edges, and uses I/O pins I/O2–I/O7 for status reporting (Data Polling on I/O7, Toggle Bit on I/O6, Erase/Program Status on I/O5, VPP Status on I/O3).
It operates exclusively in word mode (I/O0–I/O15 active) due to its AT49BV320-specific pinout - unlike the AT49BV321 which uses BYTE pin for x8/x16 mode selection. The device powers up in read mode and requires explicit command entry to enter program or erase states; all embedded operations are self-timed and require no external clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16 or 4,194,304 × 8), enabling full firmware image storage for mid-complexity MCUs. |
| Access Time | 90 ns max (indicated by -90 suffix), ensuring compatibility with 11 MHz bus timing in legacy 80C51 or ARM7-based systems. |
| Supply Voltage | 2.65V to 3.3V only - not 3.0–3.6V like LV variants; requires stable low-noise 3.0V rail for reliable program/erase. |
| Sector Architecture | 71 sectors: 63 × 64 KB + 8 × 8 KB, allowing granular firmware updates without erasing entire memory space. |
| Program Time | 15 µs per word - enables fast field firmware patching; supported by Single Pulse Program Mode after six-byte entry. |
| Erase Time | 200 ms per sector - deterministic timing simplifies system-level timeout handling in real-time OS environments. |
| Standby Current | 10 µA - suitable for battery-backed applications where memory retention must coexist with ultra-low quiescent power. |
Pinout & Package
AT49BV320-90TI is packaged in a 48-pin Thin Small Outline Package (TSOP Type I, 12 × 20 mm, 0.5 mm pitch), pin-compatible with JEDEC MO-141AC. Pin functions are electrically and physically identical across AT49BV320(T) variants; the "-90TI" suffix denotes 90 ns speed grade and TSOP packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 2M-word addressing; A-1 not used (word-mode only). |
| I/O0–I/O15 | Data I/O (x16) | Bi-directional 16-bit data bus; no byte-mode operation - I/O8–I/O15 always active. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access - prevents bus contention. |
| OE | Output Enable | Active-low output control; used with CE to gate data outputs - essential for shared-bus arbitration. |
| WE | Write Enable | Active-low write strobe; latches addresses and commands on falling edge - critical for command sequence timing. |
| VPP | Write Protection Supply | Must be ≥1.65V for program/erase; <0.8V disables all writes - provides hardware-level security against accidental corruption. |
| RESET | Device Initialization | Active-low reset halts ongoing operations and forces high-impedance outputs - enables safe system recovery. |
| RDY/BUSY | Status Output | Open-drain signal (not present on AT49BV320; only on AT49BV321) - this variant relies on I/O polling/toggle bits instead. |
| BYTE | Mode Select | Not connected (NC) on AT49BV320 - device permanently configured for x16 operation; differs from AT49BV321. |
| VCCQ | Output Driver Supply | Must tie to VCC for 3.0V I/O levels; decoupling required to maintain VOH = VCCQ − 0.2V stability during fast reads. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Lockdown | Per-sector write-protection enabled via six-cycle command; preserves boot code integrity while allowing runtime update of application sectors. |
| Erase/Program Suspend | Interrupt long-running erase (≤15 µs suspend latency) to read or program other sectors - enables real-time firmware hot-patching. |
| 128-bit Protection Register | Factory-programmed 64-bit Block A + user-programmable/lockable Block B - supports secure key storage and anti-cloning in OEM designs. |
| VPP Hardware Write Protection | Dedicated voltage-controlled pin inhibits all program/erase if <0.8V - eliminates need for software-only lock mechanisms vulnerable to glitches. |
| Single-Pulse Program Mode | After six-byte entry, subsequent writes require only one WE pulse per word - reduces host CPU overhead by >60% vs. standard four-cycle programming. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Memory |
|---|---|
|
Use Scenario: Storing bootloader and safety-critical firmware in programmable logic controllers operating in harsh EMI environments with infrequent field updates. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector lockdown protecting boot vector and watchdog initialization routines; 90 ns access satisfies deterministic scan-cycle timing. Use Value: Enables certified firmware rollback and secure over-the-air updates without risking corruption of safety-critical startup code. |
Use Scenario: Holding FDA-compliant boot firmware and calibration tables in portable diagnostic equipment requiring traceable, tamper-resistant memory. IC Role / Device Role / Timing Role: Secure boot memory with 128-bit protection register storing cryptographic keys; VPP-based hardware lock prevents unauthorized reprogramming during service. Use Value: Meets IEC 62304 Class C software requirements by providing immutable boot code and auditable firmware revision history. |
| Automotive Body Control Module | Networking Equipment Configuration Store |
|
Use Scenario: Retaining configuration parameters and CAN protocol stack in 12V automotive body ECUs exposed to wide temperature swings (-40°C to +105°C). IC Role / Device Role / Timing Role: Low-power (10 µA standby) nonvolatile storage with robust sector erase - allows parameter reset without full firmware reload. Use Value: Reduces wake-up current consumption and extends battery life during vehicle sleep mode while maintaining EEPROM-like flexibility. |
Use Scenario: Storing switch/router configuration profiles and MAC address tables in carrier-grade Ethernet equipment requiring zero-downtime firmware upgrades. IC Role / Device Role / Timing Role: Dual-bank capable Flash (via suspend/resume) enabling background firmware download while maintaining live packet forwarding. Use Value: Eliminates service interruption during field upgrades by allowing concurrent read (active config) and program (new config) operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV322A-90TI | Successor with enhanced reliability (A-grade), improved data retention (>20 years), and tighter tACC tolerance (90 ns guaranteed over full temp range). | Preferred for new designs requiring extended lifecycle support and AEC-Q100 alignment; pinout and command set fully backward compatible. | Select AT49BV322A-90TI when long-term supply assurance and automotive-grade qualification are required. |
| SST39VF3201-90-4I-EQE | 3.3V-only operation (3.0–3.6V), 48-pin TSOP, same density and sector architecture but uses different command set and lacks VPP pin. | Requires firmware adaptation for command sequences; no hardware write protection - relies on software locks and status bit monitoring only. | Choose SST39VF3201-90-4I-EQE only if migrating from existing Silicon Storage Technology designs and VPP independence is acceptable. |
Compared with AT49BV320-90TI, AT49BV322A-90TI offers superior longevity and qualification coverage without layout changes, while SST39VF3201-90-4I-EQE trades hardware security for broader voltage tolerance and alternate ecosystem support - both require validation of command-layer compatibility in existing firmware.
Availability
AT49BV320-90TI is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and networking infrastructure requiring stable component supply and long-lifecycle support.
Supply support for AT49BV320-90TI 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 full technical and manufacturing continuity for the AT49BV/LV Flash family. The company specializes in scalable, secure, and power-optimized semiconductor solutions for embedded control.
The AT49BV320-90TI belongs to Microchip's legacy parallel-interface Flash memory product line, designed specifically for cost-sensitive, high-reliability embedded systems requiring in-system programmability without external high-voltage supplies.
FAQ
What is the operating voltage range for AT49BV320-90TI?
The AT49BV320-90TI operates strictly within 2.65V to 3.3V - it is a BV-series device, not LV. Operation outside this range may cause unreliable program/erase or data retention failure. VPP must be ≥1.65V for write operations and tied to VCCQ for proper output drive strength. This voltage constraint is fixed and cannot be extended via external circuitry.
Does AT49BV320-90TI support byte-mode operation?
No, AT49BV320-90TI does not support byte-mode operation. Its pinout fixes I/O0–I/O15 as active data lines and leaves the BYTE pin unconnected (NC). Unlike the AT49BV321-90TI, this variant is hardwired for x16 word-mode only - attempting byte-mode access will result in undefined behavior or bus contention.
How is write protection implemented on AT49BV320-90TI?
AT49BV320-90TI uses dual-layer write protection: hardware-level inhibition via the VPP pin (program/erase disabled if <0.8V), and software-level sector lockdown via six-cycle command. The 128-bit protection register adds cryptographic key storage, but VPP remains the primary physical barrier against accidental writes during power transients or firmware bugs.
What status signals indicate completion of program or erase on AT49BV320-90TI?
AT49BV320-90TI lacks the RDY/BUSY pin (present only on AT49BV321 variants), so it relies entirely on polling methods: Data Polling (I/O7 toggles/complements during operation, returns true data on completion) and Toggle Bit (I/O6 alternates until operation ends). Both require reading I/O5 and I/O3 to confirm success and rule out VPP or timeout errors.
Is AT49BV320-90TI pin-compatible with AT49BV322A-90TI?
Yes, AT49BV320-90TI and AT49BV322A-90TI share identical TSOP-48 pinout, electrical characteristics, command set, and timing - the latter is a direct drop-in replacement with enhanced data retention and extended temperature validation. No PCB or firmware changes are needed when upgrading, making AT49BV322A-90TI the recommended choice for new designs.
AT49BV320-90TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8, 2M x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 150µs
- Access Time:
- 90 ns
- Voltage - Supply:
- 2.65V ~ 3.3V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSOP
AT49BV320-90TI FAQ
1.How can I place an order for AT49BV320-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV320-90TI 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 AT49BV320-90TI reliable?
The price and inventory of AT49BV320-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV320-90TI is usually 5 days.
3.What payment methods are accepted for AT49BV320-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV320-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV320-90TI?
AT49BV320-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV320-90TI 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 AT49BV320-90TI?
For technical support, including AT49BV320-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV320-90TI requirements.
6.How does Aetrix verify that AT49BV320-90TI is sourced from the original manufacturer or authorized distributors?
All AT49BV320-90TI 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 AT49BV320-90TI meets industry standards.
7.What is the process for return or replacement of AT49BV320-90TI?
All AT49BV320-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV320-90TI, 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 AT49BV320-90TI part is unused and in its original packaging.
Return procedure for AT49BV320-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49BV320-90TI Tags
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