DS1338Z-33+T&R - I2C RTC with 56B NV SRAM | ADI
부품 번호: DS1338Z-33+T&R ✓ 활성DS1338Z-33+T&R 개요
A real-time clock is an integrated timing device that maintains calendar information independently of a system’s main processor. The RTC category belongs to the broader timing and clock hierarchy and supports timekeeping in embedded systems. The DS1338 combines that calendar function with 56 bytes of nonvolatile SRAM, allowing a controller to retain small amounts of configuration, diagnostic, or application data alongside the time and date.
The key feature of the DS1338 family is its compact integration. One 8-pin SOIC device provides an I2C-connected BCD clock/calendar and nonvolatile memory. The manufacturer describes automatic end-of-month adjustment for months with fewer than 31 days, reducing date-management burden in firmware. The verified distributor listing identifies the target as an 8-SOIC real-time clock with 56 bytes of I2C-accessible nonvolatile SRAM.
The DS1338Z-33+ device family supports a 3 V to 5.5 V operating range, as reported in the verified component search data. Its serial architecture reduces the number of communication lines required from a microcontroller or other embedded controller. Because address and data share the same two-wire bus, software must distinguish register addresses from register data using the device’s documented I2C protocol and acknowledge behavior.
Typical uses include industrial embedded controllers, data-acquisition equipment, communication systems, access-control hardware, and compact consumer products that require persistent timestamps. In these systems, the RTC can retain time across power interruptions while the host controller records events, schedules operations, or timestamps stored measurements. The 56-byte nonvolatile SRAM is useful when a small amount of state must survive a reset or power cycle.
Designers should provide the clock circuit and power structure exactly as specified by the manufacturer datasheet, including required crystal or oscillator components and the applicable VCC and VBAT arrangements. Software should also confirm the correct 3.3 V-related device variant and validate BCD-to-decimal conversion, rollover behavior, and I2C address handling during commissioning.
This page consolidates verified manufacturer and distributor information for the DS1338Z-33+T&R, adds practical application and design guidance, and identifies drop-in alternatives from the supplied cross-reference search results. It is intended to support component selection without treating unreported electrical details as guaranteed specifications.
드롭인 대체품: DS1338Z-33+T&R — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: DS1338Z-33+T&R (동일 폼 팩터 및 풋프린트) — 차이점: Device Type, Package, Month-End Adjustment, Mounting Type, Serial Interface.
DS1338Z-3+T&R
✅ 드롭인가격 문의
데이터시트 보기 →DS1340Z-33+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
PT7C433833WEX
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
FRTC1338S
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
DS1338Z-33+T&R 사양
| Device Type | Serial real-time clock (RTC) with clock/calendar and nonvolatile SRAM |
| Calendar Format | Full binary-coded decimal (BCD) |
| 인터페이스 | 2-wire I2C serial interface |
| Nonvolatile SRAM Capacity | 56 bytes |
| Supply Voltage Range | 3 V to 5.5 V |
| 패키지 | 8-pin SOIC, 3.90 mm width |
| 실장 유형 | Surface-mount |
| Calendar Data | Seconds, minutes, hours, day, date, month, and year |
| End-of-Month Adjustment | Automatic adjustment for months with fewer than 31 days |
| Address and Data Transfer | Serial transfer over I2C |
| Product Ordering Suffix | -33+T&R tape-and-reel ordering code |
DS1338Z-33+T&R 8-pin soic, 3.90 mm width 핀 구성 가이드
DS1338Z-33+T&R(8-pin soic, 3.90 mm width 패키지)의 핀 구성입니다. 핀 번호, 기능, 연결 다이어그램은 제조사 데이터시트에 정의되어 있습니다. 정확한 풋프린트와 솔더링 지침은 해당 문서를 참조하십시오.
다음에 대한 상세 핀아웃 데이터 없음: DS1338Z-33+T&R.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
DS1338Z-33+T&R 적합 용도: 6 애플리케이션s: Industrial Embedded Controllers, Data-Acquisition Systems, Communication Equipment, Access-Control and Security Systems, Consumer Electronics and Appliances, Portable and Battery-Powered Devices.
Industrial Embedded Controllers
The DS1338Z-33+T&R fits industrial embedded controllers that require dependable calendar time and a small amount of persistent local state. Its 3 V to 5.5 V operating range covers the verified 3.3 V-related version, while the 2-wire I2C interface limits the connection to the controller and the 8-pin SOIC package supports conventional surface-mount assembly. The clock/calendar supplies seconds through year in full BCD format, including automatic end-of-month adjustment. The 56-byte nonvolatile SRAM can preserve counters, configuration flags, or diagnostic identifiers when the main controller resets. Firmware should use the manufacturer-defined register map, acknowledge sequence, and rollover rules rather than treating the calendar as an unstructured timestamp. For industrial releases, verify the complete temperature range, oscillator tolerances, EMC requirements, and long-term availability from the official datasheet before production approval.
추천
Data-Acquisition Systems
The DS1338Z-33+T&R is appropriate for data-acquisition equipment that must timestamp samples across a mains interruption or controller reset. The dedicated BCD calendar maintains seconds, minutes, hours, day, date, month, and year, while the verified 56-byte nonvolatile SRAM offers space for limited operational metadata. The I2C interface lets the acquisition controller read or update the RTC without using a separate parallel bus. In a typical implementation, the controller reads the clock registers when a sample is triggered and stores the resulting date and time in host flash or external nonvolatile memory. The DS1338Z-33+ 3 V to 5.5 V range supports a 3.3 V acquisition rail. Engineers should account for oscillator accuracy when reconstructing sample timing and should use the official timing and application information to select the appropriate clock source and decoupling arrangement.
추천
Communication Equipment
The DS1338Z-33+T&R can support communication equipment that needs local wall-clock data, event sequencing, and limited persistent records. Its I2C interface is suitable for a host processor or communications controller, while the full BCD clock/calendar supplies a structured representation of time and date. The 56 bytes of nonvolatile SRAM are particularly useful for saving a short configuration state, message sequence number, or diagnostic flag without adding a separate memory IC. The verified 3 V to 5.5 V operating range aligns with the target 3.3 V class of equipment, and the 8-SOIC package limits board area compared with a larger clock module. Firmware must implement the documented I2C transaction sequence and synchronize software timestamps with the RTC. Before deployment in network appliances, validate oscillator holdover, temperature drift, time-setting procedures, and backup-power behavior using the manufacturer documentation.
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Access-Control and Security Systems
The DS1338Z-33+T&R fits access-control terminals and security equipment that need a local time reference and a compact record of controller state. The RTC can maintain calendar information when the main processor is busy, while the 56-byte nonvolatile SRAM can preserve a short audit or configuration record across a power cycle. Serial I2C communication permits the security controller to request time data and share the same bus with other compatible devices. Its verified 3 V to 5.5 V supply range supports the 3.3 V-related version, and automatic end-of-month adjustment reduces calendar software complexity. In practice, engineers should confirm that event timestamps use the RTC as intended rather than relying only on an intermittent host timer. Access-control qualification also requires checking the supported temperature range, backup-source behavior, oscillator accuracy, and any regulatory requirements that are outside the scope of the supplied component data.
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Consumer Electronics and Appliances
The DS1338Z-33+T&R is useful in compact consumer electronics that need to retain a real date and time even when their main controller is reset. Appliances, recorders, and connected peripherals can use the 56-byte nonvolatile SRAM for a small amount of setup information, installation count, or diagnostic data. The device communicates through the same two-wire I2C bus used for many embedded peripherals, reducing wiring and software complexity compared with a parallel RTC. Its 3 V to 5.5 V operating range includes the verified 3.3 V class, while the 8-pin SOIC package is compatible with automated surface-mount production. The full BCD calendar provides predictable timekeeping fields and automatically adjusts month-end behavior. Product engineers should still validate low-voltage behavior, oscillator startup, backup power, time-setting user experience, and long-term drift against the manufacturer application guidance before volume production.
추천
Portable and Battery-Powered Devices
The DS1338Z-33+T&R can support portable and battery-powered products that need calendar retention with a compact 8-SOIC footprint. The verified 3 V to 5.5 V range includes a 3.3 V operating rail, and the dedicated RTC allows a low-power microcontroller to remain asleep until a scheduled event instead of counting every elapsed second. The 56-byte nonvolatile SRAM can preserve compact state without requiring an additional external memory component. The main design trade-off is the need to implement an appropriate backup-power and oscillator arrangement based on the official datasheet rather than assuming battery endurance. Engineers should evaluate no-load and backup currents, oscillator start time, accuracy over temperature, and behavior during rapid power transitions. They should also verify that the host firmware handles BCD rollover and I2C re-synchronization correctly after sleep or reset.
추천
추천 제품 요약
엔지니어링 참조 데이터: DS1338Z-33+T&R — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | DS1338Z-3+T&R | DS1340Z-33+ | PT7C433833WEX | FRTC1338S |
|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 |
| Brand | Analog Devices | Analog Devices | Analog Devices | NXP | NYFEA |
주요 차별점
- Combines a complete BCD calendar with persistent local storage (vs DS1340Z-33+)
- Matches the target -33 3.3 V-oriented ordering family (vs DS1338Z-3+T&R)
- Uses the established DS1338Z feature combination (vs PT7C433833WEX)
- Supported by an official Analog Devices family product page (vs FRTC1338S)
설계 노트
Follow the manufacturer datasheet for the VCC, VBAT, ground, and decoupling connections rather than treating the RTC as a simple always-powered peripheral. The verified operating range is 3 V to 5.5 V, but backup-source behavior and current consumption were not supplied. Confirm that the backup source cannot back-feed the active rail, that decoupling is placed close to the supply pins, and that the 3.3 V rail remains within the required limits during power transitions.
Use the official DS1338Z package drawing and pin-description table before finalizing the PCB because the supplied verified snippets confirm an 8-SOIC package but do not provide the numbered pin map. Keep the I2C traces short, route SDA and SCL away from noisy switching nodes, and provide the oscillator components on the layout recommended by the manufacturer. A compact but incorrect oscillator or backup-power layout can undermine time accuracy even when the I2C communication remains functional.
Do not assume that a same-package replacement is automatically firmware-compatible. The DS1338Z-3+T&R is closely related, DS1340Z-33+ adds a trickle-charger function, and the PT7C433833WEX and FRTC1338S candidates are cross-brand parts. During substitution, compare I2C addresses, register maps, calendar rollover rules, oscillator implementation, backup behavior, and alarm functions. Update and regression-test firmware even when the PCB land pattern remains unchanged.
The DS1338Z-33+T&R uses a two-wire I2C interface, so address and data share the same bus. Ensure pull-up values satisfy the selected bus voltage, rise time, and the host controller’s input thresholds rather than copying values from an unrelated 5 V design. Account for bus capacitance and use the manufacturer’s documented acknowledge behavior. Firmware should verify every register transaction because a misplaced acknowledge can appear as an incorrect calendar or SRAM read.
규정 준수 정보
The supplied search results reference compliance comparisons but do not provide extractable RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals values for the target. These fields remain unknown rather than being inferred.