DS1338Z-33+ - I2C RTC with 56-Byte NV RAM | Analog Devices
MPN： DS1338Z-33+ ✓ 啟用中DS1338Z-33+ 概覽
A real-time clock is a clock-and-calendar IC that maintains time independently of a host processor. In the hierarchy of electronic components, the DS1338 belongs to the real-time clock category, then timing ICs, then integrated circuits and semiconductors. Its combination of BCD calendar registers, I²C connectivity, and battery-backed nonvolatile memory makes it useful in embedded systems that require readable time information and persistent configuration storage.
Key verified features include seconds, minutes, hours, day, date, month, and year information; automatic month-end adjustment for months with fewer than 31 days; 56 bytes of NV SRAM; and operation from 3 V to 5.5 V. The device is supplied in an 8-SOIC package with a 3.90 mm width. The supplied distributor result identifies the part as a clock/calendar IC with a two-wire serial interface and 56-byte NV RAM.
The BCD register organization simplifies direct connection with embedded host software and allows calendar fields to be read over I²C without binary-to-decimal conversion in every register representation. The NV SRAM can retain board-specific data such as configuration values, counters, calibration information, or serialized identifiers when the system is operating from its backup supply.
Typical uses include industrial control equipment, data loggers, embedded instruments, access-control terminals, connected sensors, and consumer products requiring a persistent timestamp. The I²C interface allows the RTC to share a two-wire bus with compatible devices, reducing the number of host-controller pins required for timekeeping and small nonvolatile storage.
When laying out a design, confirm the SOIC footprint, battery-backup arrangement, I²C address configuration, and decoupling requirements against the manufacturer datasheet. This page distinguishes verified facts from parameters not supplied in the retrieved data and avoids inferring missing electrical or timing values.
直接替換替代品，適用於 DS1338Z-33+ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： DS1338Z-33+ （相同外形與佔位） — 差異在於 Package, Serial Interface, Date Format, Device Type, Function.
DS1338Z-18+
✅ 直接替換聯絡詢價
查看資料表 →DS1338Z-3+T&R
✅ 直接替換聯絡詢價
查看資料表 →DS1338Z-33
✅ 直接替換📋 參考替代品（不在目錄中）
FRTC1338S
✅ 直接替換📋 參考替代品（不在目錄中）
DS1337C
✅ 直接替換📋 參考替代品（不在目錄中）
DS1338Z-33+ 規格
| Device Type | Real-time clock and calendar IC |
| Supply Voltage Range | 3 V to 5.5 V |
| Serial Interface | I²C, 2-wire serial |
| Calendar Format | Full binary-coded decimal (BCD) |
| Nonvolatile Memory | 56 bytes NV SRAM |
| Stored Time Fields | Seconds, minutes, hours, day, date, month, and year |
| Month-End Handling | Automatic adjustment for months with fewer than 31 days |
| 封裝 | 8-SOIC, 0.154 inch, 3.90 mm width |
| 安裝類型 | Surface mount |
| Temperature Format | HH:MM:SS, 12-hour and 24-hour |
| Date Format | YY-MM-DD-dd |
| Backup Timekeeping | Battery backup |
| Square-Wave Output | Available |
DS1338Z-33+ 8-soic, 0.154 inch, 3.90 mm width 腳位配置指南
DS1338Z-33+（8-soic, 0.154 inch, 3.90 mm width 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： DS1338Z-33+.
請參閱 資料表 以查看完整腳位配置。
典型應用
DS1338Z-33+ 適用於 6 應用s: Industrial Data Loggers, Embedded Measurement Instruments, Access-Control and Security Terminals, Connected Sensor Systems, Battery-Powered Consumer Devices, Automated Test and Measurement Equipment.
Industrial Data Loggers
The DS1338Z-33+ fits industrial data loggers that must retain time and small configuration records while the main logger is unpowered. Its I²C interface lets a host controller read full-BCD calendar fields, and the 56-byte NV RAM can hold calibration constants, logging-session identifiers, or device metadata. The 8-SOIC package is practical for compact controller boards. The verified data does not state accuracy, retention, or backup-current figures, so system designers should confirm those values against the Analog Devices datasheet before defining maintenance intervals or regulatory logging requirements.
推薦
Embedded Measurement Instruments
The DS1338Z-33+ is suitable for measurement instruments that need a readable local timestamp alongside persistent setup data. A host can access calendar and time registers over the two-wire interface and use the 56-byte NV SRAM to retain instrument configuration, serial numbers, or calibration offsets when power is removed. The 3 V to 5.5 V operating range supports common embedded supply rails, while the 8-SOIC footprint simplifies board assembly. Because the supplied data does not include oscillator accuracy or I²C timing limits, the final design should be checked against the complete manufacturer specification.
推薦
Access-Control and Security Terminals
The DS1338Z-33+ can provide timekeeping and small persistent storage in access-control terminals, where event logs need calendar context and device settings should survive a power interruption. The I²C bus allows the terminal controller to read and update BCD time registers, while the 56-byte NV RAM can retain a base configuration or event-sequence marker. The same 8-SOIC package used by the target simplifies replacement-board planning. Verify backup-power behavior, oscillator start-up, and access-control timing requirements with the manufacturer datasheet because those details are not included in the retrieved snippets.
推薦
Connected Sensor Systems
The DS1338Z-33+ is useful in connected sensor systems that timestamp measurements and retain a small amount of local state across resets. Its I²C interface supports a shared two-wire connection with a host or sensor aggregator, while the RTC maintains calendar fields and the 56-byte NV RAM can hold node identifiers or calibration values. The 3 V to 5.5 V range is compatible with many embedded rails, and the small SOIC package helps reduce board area. The retrieved data does not identify a temperature coefficient or accuracy number, so wireless sensor products must qualify long-term timing separately.
推薦
Battery-Powered Consumer Devices
The DS1338Z-33+ can support battery-backed consumer equipment that needs time-of-day and calendar records but has limited host resources. Its low-power RTC architecture and 56-byte NV RAM allow a controller to retain small configuration values without using a separate memory component. The I²C interface reduces wiring, and the 3 V to 5.5 V supply range aligns with common embedded systems. Actual battery-life calculations require the missing operating and backup current values from the manufacturer datasheet, as well as the final oscillator and power-management design.
推薦
Automated Test and Measurement Equipment
The DS1338Z-33+ can add a persistent timestamp to automated test equipment, allowing measurement records, calibration files, or instrument settings to remain associated with real time. The BCD clock/calendar format provides direct access to seconds, minutes, hours, day, date, month, and year, while the 56-byte NV RAM provides limited persistent storage beside the time function. Its 8-SOIC package is straightforward to route in compact controller cards. The product must be qualified against the instrument’s required accuracy, temperature range, backup-power behavior, and calibration workflow using the full Analog Devices documentation.
推薦
推薦產品摘要
工程參考資料，適用於 DS1338Z-33+ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | DS1338Z-18+ | DS1338Z-3+T&R | DS1338Z-33 | FRTC1338S | DS1337C |
|---|---|---|---|---|---|---|
| Package | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (package listing) | 8-SOIC (search-result listing) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | NYFEA | Analog Devices |
| RTC Function | Real-time clock and calendar | Real-time clock | Real-time clock | Real-time clock | Real-time clock | Real-time clock |
| Surface-Mount Form | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC claimed in listing | 8-pin SOIC claimed in comparison result |
主要差異化特點
- Combines an I²C RTC with 56 bytes of NV RAM (對比DS1337C)
- Full BCD calendar representation (對比DS1338Z-18+)
- 3 V to 5.5 V supply range (對比FRTC1338S)
- Automatic month-end adjustment (對比DS1338Z-33)
設計說明
Use the official DS1338/DS1338Z SOIC land pattern and route I²C traces away from noisy switching nodes and high-current paths. Keep the RTC and its backup network close to the ground and supply references, and place required decoupling components at the package pins according to the manufacturer layout guidance. The retrieved data confirms the 8-SOIC package but does not provide the complete pin diagram, so do not finalize routing from package appearance alone.
Design the backup-power path so that the RTC receives the voltage and current conditions specified by the manufacturer, including any required battery, capacitor, or isolation arrangement. The verified distributor result identifies battery backup, but it does not provide backup voltage, leakage current, or capacitor values. Treat battery life and data-retention claims as [DATA_NEEDED] until they are taken from the official datasheet and validated in the final power tree.
The two-wire I²C bus must meet the device’s specified timing and pull-up requirements. Check rise and fall time, bus capacitance, address configuration, and the maximum bus frequency from the manufacturer datasheet. Do not assume that an I²C bus used by a host controller is automatically compatible with the DS1338Z-33+; validate the complete bus topology and level translation when another voltage domain is present.
Do not substitute DS1338Z-18+, DS1338Z-3+T&R, FRTC1338S, DS1337, or DS1337C without checking the exact pinout and suffix-specific ratings. Search-result similarity does not prove identical oscillator accuracy, backup current, calendar limits, I²C address behavior, or NV RAM endurance. For production qualification, compare the manufacturer datasheets and perform power-cycle and communication tests on assembled boards.
合規資訊
The supplied verified snippets do not provide a part-specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration. Compliance must be confirmed from current Analog Devices documentation before procurement.
