AT45DB321C-TC - 32Mbit SPI DataFlash, 28-TSOP | Microchip
부품 번호: AT45DB321C-TC ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.88 | $48.80 |
| 100 | $4.15 | $415.00 |
| 500 | $3.72 | $1,860.00 |
| 1,000 | $3.3 | $3,300.00 |
AT45DB321C-TC 개요
A DataFlash is a page-oriented serial NOR-flash memory that divides the array into 8192 pages of 528 bytes (or 8192 pages of 512 bytes in binary page mode), with two SRAM buffers of 528 bytes each enabling single-clock rewrite-in-place operations. Unlike generic SPI NOR flash, DataFlash supports simultaneous read-while-write via these buffers, making it a hybrid between raw flash and small EEPROM. Architecturally it sits inside the NOR flash -> serial flash -> DataFlash hierarchy, and within power management it functions as non-volatile storage rather than a regulator. AT45DB321C refers specifically to the 32-Mbit density in the AT45DB series, which spans 2-Mbit through 128-Mbit densities.
Key features include dual SRAM data buffers (528 bytes each), built-in hardware page-erase and block-erase engines, a 128-byte security register, JEDEC-standard SPI mode 0/3 support, and a RapidS mode for sustained throughput approaching byte-per-clock efficiency. The device also integrates a sequential read command that streams data with a single opcode, plus deep power-down at less than 10 uA typical. Industrial temperature grade (-40C to +85C) is offered for embedded and commercial applications.
Typical applications include firmware and bootloader storage in microcontroller systems, data logging in industrial sensors, voice/audio sample storage, image storage in mid-resolution camera modules, and configuration parameter storage in networking equipment. The 528-byte page size is convenient for audio frames and small sector writes. Designers should note that the 'TC' suffix denotes the TSOP-I commercial-grade package, distinct from the lead-free 'CC' (BGA) and industrial 'TI' versions. This datasheet synthesizes distributor pricing, drop-in compatibility information, and application design notes beyond the manufacturer datasheet summary.
드롭인 대체품: AT45DB321C-TC — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AT45DB321C-TI
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AT45DB321C-CNC
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AT45DB321C-TU
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AT45DB321C-CC
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AT45DB321C-TC 최대 정격 & 전기적 특성
| 메모리 유형 | Non-Volatile NOR Flash (DataFlash) |
| 메모리 크기 | 32 Mbit (4 MB / 4,194,304 bytes) |
| 인터페이스 | SPI (Mode 0/3), RapidS 4-wire SPI |
| 최대 클록 주파수 | 40 MHz |
| Page Size | 528 bytes (or 512 bytes binary mode) |
| Number of Pages | 8192 |
| SRAM Data Buffers | 2 x 528 bytes |
| Supply Voltage (VCC) | 2.7 V to 3.6 V |
| Active Read Current | 15 mA typical |
| Standby Current | 20 uA typical |
| 동작 온도 | 0C to +70C (commercial grade, TC suffix) |
| 패키지 | 28-TSOP-I (Type I, 8x13.4 mm) |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 3 (per JEDEC J-STD-020) |
| Lead-Free / RoHS | SnPb finish (legacy TC suffix); see -T variant for lead-free |
| Endurance | 100,000 erase/write cycles per page (typical) |
| Data Retention | 20 years (typical) |
| Sector Erase Size | Page (528 B) or Block (4 KB) |
AT45DB321C-TC 핀 구성
| 핀 1 | CS — Chip Select (active low) |
| 핀 2 | SO — Serial Output (MISO) |
| 핀 3 | WP — Write Protect (active low) |
| 핀 4 | VCC — Power supply 2.7-3.6 V |
| 핀 5 | GND — Ground |
| 핀 6 | SCK — Serial Clock |
| 핀 7 | SI — Serial Input (MOSI) |
| 핀 8 | HOLD — Hold (active low, pauses serial communication) |
| 핀 9 | RESET — Reset (active low) |
| 핀 10 | NC — Not connected |
| 핀 11 | NC — Not connected |
| 핀 12 | NC — Not connected |
| 핀 13 | NC — Not connected |
| 핀 14 | NC — Not connected |
| 핀 15 | NC — Not connected |
| 핀 16 | NC — Not connected |
| 핀 17 | NC — Not connected |
| 핀 18 | NC — Not connected |
| 핀 19 | NC — Not connected |
| 핀 20 | NC — Not connected |
| 핀 21 | NC — Not connected |
| 핀 22 | NC — Not connected |
| 핀 23 | NC — Not connected |
| 핀 24 | NC — Not connected |
| 핀 25 | NC — Not connected |
| 핀 26 | NC — Not connected |
| 핀 27 | NC — Not connected |
| 핀 28 | GND — Ground |
일반적인 애플리케이션
AT45DB321C-TC 적합 용도: 6 애플리케이션s: Microcontroller Firmware Bootloader Storage, Industrial Data Logging, Voice and Audio Sample Storage, Mid-Resolution Image Storage, Networking Equipment Configuration Storage, Consumer Electronics Data Storage.
Microcontroller Firmware Bootloader Storage
The AT45DB321C-TC stores bootloader and over-the-air update payloads in microcontroller-based products. Its 32-Mbit (4 MB) capacity accommodates multi-image firmware banking where a primary and recovery image are kept on-chip simultaneously, supporting robust field updates. The SPI interface at up to 40 MHz enables fast boot-image read at startup while dual 528-byte SRAM buffers allow the MCU to begin execution before full page transfer is done. Power consumption is suitable for industrial controllers because VCC is 2.7 V to 3.6 V, matching 3.3 V MCU rails directly. Page granularity (528 B) requires write-cycle awareness in the bootloader, but the dedicated page-erase engine simplifies wear-leveling. The 28-TSOP-I footprint suits compact industrial controller PCBs where 8x13.4 mm is acceptable.
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Industrial Data Logging
The AT45DB321C-TC records sensor data in industrial monitoring systems, including factory automation PLCs, environmental monitors, and predictive-maintenance endpoints. Its 32-Mbit density stores weeks of timestamped sensor readings at typical sampling rates; 4 MB easily holds 30+ days of 4-channel 16-bit logs at 1 Hz. The SPI bus simplifies wiring in distributed nodes, and dual SRAM buffers let the host continue streaming new samples while the previous buffer is committed to flash, preventing data loss during write cycles. Operating temperature spans the industrial range when the -TI grade is selected, and 100,000 erase cycles per page with 20-year retention is sufficient for multi-year deployments. The 28-TSOP-I footprint supports standard SMT assembly.
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Voice and Audio Sample Storage
The AT45DB321C-TC is well matched for embedded voice playback, announcement systems, and audio sample ROM in consumer and industrial products. Its 528-byte page size aligns naturally with codec frame sizes used in popular audio compression schemes, simplifying write-side DMA. The 40 MHz RapidS clock supports streaming playback of 8-16 kHz / 16-bit audio, and 4 MB stores 30-60 seconds of high-quality voice. The dual SRAM data buffers enable smooth transition between consecutive audio segments without dropouts because the host can preload the next buffer while the current one streams. Operating voltage 2.7-3.6 V is compatible with common audio codec supplies, and the 28-TSOP-I is small enough for handheld devices.
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Mid-Resolution Image Storage
The AT45DB321C-TC is well matched for image capture in mid-resolution camera modules and machine-vision edge devices. With 4 MB available, the device stores 5-15 compressed JPEG frames depending on scene complexity, making it suitable for snapshot-style industrial imaging where bursts of a few frames are captured and then uploaded. The SPI bus with RapidS mode at 40 MHz delivers the throughput needed to push compressed image data out to a host controller quickly. Page-based erase architecture allows individual frames to be erased without disturbing adjacent captures, supporting selective retention in memory-constrained modules. The 28-TSOP-I package integrates cleanly with camera-module PCB layouts.
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Networking Equipment Configuration Storage
The AT45DB321C-TC stores configuration parameters, firmware images, and logs in routers, switches, and access points. Its 32-Mbit capacity comfortably holds multiple configuration profiles, certificate stores, and secondary bootloader images for field upgrade. The SPI interface at 40 MHz enables fast read of large configuration tables at boot, and the dual SRAM buffers allow concurrent writes to logs while serving read requests. Operating voltage 2.7-3.6 V is compatible with common 3.3 V networking silicon rails, and 100,000 erase cycles is more than adequate for typical config-update and log-write workloads. The 28-TSOP-I footprint fits easily in compact networking hardware.
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Consumer Electronics Data Storage
The AT45DB321C-TC stores user data, fonts, icons, and localization tables in consumer electronics such as set-top boxes, smart appliances, and gaming peripherals. Its 4 MB capacity is well matched for full Unicode font sets, multilingual UI strings, and small media libraries. The SPI interface simplifies host-controller integration in cost-sensitive designs, and RapidS mode delivers smooth asset-loading performance. Dual SRAM data buffers enable fast page swap for asset streaming during UI rendering, reducing perceived latency. Operating voltage 2.7-3.6 V and the 28-TSOP-I footprint suit compact consumer device PCBs.
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추천 제품 요약
엔지니어링 참조 데이터: AT45DB321C-TC — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AT45DB321C-TI | AT45DB321C-TU | AT45DB321C-CNC | AT45DB321C-CC |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-TSOP-I | 28-TSOP-I - same | 28-TSOP-I - same | 24-CBGA - cross-package | 24-CBGA - cross-package |
| Memory Density | 32 Mbit (4 MB) | 32 Mbit (4 MB) | 32 Mbit (4 MB) | 32 Mbit (4 MB) | 32 Mbit (4 MB) |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Interface | SPI / RapidS | SPI / RapidS | SPI / RapidS | SPI / RapidS | SPI / RapidS |
| Operating Temperature | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) |
| Lead-Free / RoHS | SnPb (Non-RoHS) | SnPb (Non-RoHS) | Lead-Free (RoHS) | Lead-Free (RoHS) | Lead-Free (RoHS) |
| Endurance (erase/write cycles) | 100,000 per page (typ) | 100,000 per page (typ) | 100,000 per page (typ) | 100,000 per page (typ) | 100,000 per page (typ) |
주요 차별점
- Dual SRAM buffers enable simultaneous read-while-write (vs Generic SPI NOR flash without buffer architecture)
- RapidS mode delivers near-byte-per-clock throughput (vs Standard SPI mode)
- Page-oriented 528 B granularity for audio/frame alignment (vs 256-byte-sector SPI NOR flash)
설계 노트
AT45DB321C-TC operates from a single 2.7 V to 3.6 V supply on the VCC pin (pin 4) with GND on pin 5 and pin 28. Bypass VCC to GND with a 100 nF ceramic capacitor placed within 5 mm of the package, plus a 4.7 uF bulk capacitor for transient suppression during page-program operations. Program/erase cycles draw peak currents above the 15 mA active-read typical, so the regulator headroom is important: select an LDO or DC-DC rated for at least 50 mA peak to avoid VCC droop during buffer-to-flash commits. The deep-power-down command drops quiescent to microamp levels - useful for battery-backed designs.
Route SPI traces (SCK, SI, SO, CS) as a short matched-length group, kept under 50 mm total length, and place a 33 ohm series resistor on SCK close to the host if the bus runs above 30 MHz. The CS signal must be glitch-free; a pull-up on CS prevents unintended selection during host reset. The HOLD and RESET pins have internal weak pull-ups but adding external 10 kohm pull-ups to VCC improves noise immunity in industrial environments. If using RapidS mode, ensure the host supports mode 0 (CPOL=0, CPHA=0) for the read opcode path.
Avoid these three common pitfalls when designing with the AT45DB321C-TC: (1) the 528-byte page granularity means a single-byte write still requires a full 528-byte page erase cycle, plan your write-buffer strategy accordingly; (2) the 'TC' suffix is tin-lead finish and is NOT RoHS-compliant - for RoHS assembly choose the -TU (TSOP) or -CNC (BGA) variants; (3) some commands require the buffer-write-then-buffer-to-flash sequence rather than direct page write - consult the command-set table before firmware integration. Power-supply ramp time must be slower than the device's reset-spec minimum to avoid spurious command latching.
The 28-TSOP-I package is 8x13.4 mm with 0.55 mm pitch - use 0.55 mm wide land pads with solder mask defined openings to ensure reliable paste release. Route all SPI signals on the top layer under the part or on an adjacent ground-referenced layer; keep clock trace length matched to data trace length within 5 mm. Place the 100 nF VCC bypass directly under the package between VCC and the adjacent GND pin to minimize the supply-loop area. Avoid routing noisy signals (DC-DC switch nodes, motor drivers) directly under the flash to prevent radiated-noise-induced SPI errors.
규정 준수 정보
The 'TC' suffix denotes tin-lead (SnPb) finish and is NOT RoHS compliant. For RoHS designs choose AT45DB321C-TU (TSOP-I) or -CC/-CNC (BGA) variants. Reach status is compliant per Microchip documentation. AEC-Q100 is not applicable for this commercial-grade flash memory.
