BQ4845S-A4NTR TI Real-Time Clock | 28-SOIC | 5V, 128x8 NVRAM

Product Overview

The BQ4845S-A4NTR is a high-performance real-time clock (RTC) module from Texas Instruments, designed for applications requiring accurate timekeeping and nonvolatile memory storage. Housed in a 28-pin SOIC package, this device integrates a full-function RTC with a 128x8 static RAM (SRAM) that is made nonvolatile through an internal lithium battery. The BQ4845S-A4NTR operates at a supply voltage of 5V and provides a multiplexed address/data bus for easy interfacing with microprocessors. It features a quartz crystal oscillator for precise timekeeping, with typical accuracy of ±1 minute per month at 25°C. The device also includes programmable alarm functions, a square wave output, and automatic power-fail detection with battery backup to preserve data during power loss.

Detailed Technical Specifications

Key Features

• Integrated real-time clock with calendar (seconds, minutes, hours, day, date, month, year)
• 128 x 8 nonvolatile SRAM for data storage
• Automatic power-fail detect and switch circuitry
• Programmable alarm and interrupt functions
• Square wave output with multiple frequency options
• Low power consumption in battery backup mode (typically 1µA)
• Direct interface with most microprocessors via multiplexed bus
• Internal lithium battery with long shelf life

Target Applications

• 5G base station equipment requiring precise time synchronization
• Automotive dashboard clocks and event data recorders
• Industrial automation controllers with time-stamped logging
• Smart meters (electricity, water, gas) for time-of-use billing
• Medical devices such as patient monitors and infusion pumps
• Security systems with time-stamped access logs
• Telecommunication infrastructure for network timing

Global Supply Chain & Wholesale Solutions

At Jasin Chip, we provide professional supply chain and wholesale solutions for BQ4845S-A4NTR. Our core advantages include:

• 24/7 Global Customer Support: Professional team providing instant quotes and technical support worldwide.
• In-stock Inventory, Same-day Shipping: We maintain localized stock; orders confirmed before 4 PM are shipped the same day.
• HK-SZ Synergy, Flexible Settlement: Direct global shipping from Shenzhen with support for HK bank transfers and multi-currency.
• Escrow Secured Transactions: We support Escrow.com for secure transactions, ensuring peace of mind for batch orders.
• BOM Kitting & Sampling Services: Specialized sourcing for testing samples and urgent shortage components.

Quality Assurance & Compliance

Jasin Chip guarantees that all delivered products are 100% original factory stock with full quality assurance and traceability.

• 100% Original & Authentic: All components are guaranteed to be authentic with strict quality control.
• RoHS Compliant: All electronic components comply with international environmental and safety standards.
• Original Factory Packaging: We maintain original factory packaging and seals to ensure ESD protection and physical integrity.

產品概述

BQ4845S-A4NTR 是德州儀器（TI）推出的一款高性能實時時鐘（RTC）模塊，專為需要精確計時和非易失性存儲的應用而設計。該器件採用 28 引腳 SOIC 封裝，集成了全功能 RTC 和 128x8 靜態 RAM（SRAM），並通過內部鋰電池實現非易失性。BQ4845S-A4NTR 在 5V 電源電壓下工作，提供復用地址/數據總線，便於與微處理器接口。它採用石英晶體振盪器實現精確計時，在 25°C 下典型精度為 ±1 分鐘/月。該器件還包括可編程報警功能、方波輸出以及自動掉電檢測，可在斷電時通過電池備份保存數據。

詳細技術參數

核心特性

• 集成實時時鐘與日曆（秒、分、時、星期、日期、月、年）
• 128 x 8 非易失性 SRAM 用於數據存儲
• 自動掉電檢測與切換電路
• 可編程報警和中斷功能
• 多種頻率選項的方波輸出
• 電池備份模式下低功耗（典型 1µA）
• 通過復用總線直接與大多數微處理器接口
• 內部鋰電池，長保存壽命

典型應用場景

• 需要精確時間同步的 5G 基站設備
• 汽車儀表板時鐘和事件數據記錄器
• 帶時間戳記錄的工業自動化控制器
• 智能電錶（電、水、氣）用於分時計費
• 醫療設備如病人監護儀和輸液泵
• 帶時間戳訪問日誌的安全系統
• 用於網絡定時的電信基礎設施

環球供應鏈與批發合作夥伴方案

在 Jasin Chip，我們為 BQ4845S-A4NTR 提供全面的供應鏈與批發解決方案。 我們的核心優勢包括：

• 全天候環球客戶支援：專業團隊為您提供即時報價及技術支援，無需漫長等待。
• 現貨庫存，即日發貨：確保現貨充足。下午 4 點前確認訂單，即可安排當天寄出。
• 深港聯動，結算靈活：深圳直發全球，物流高效可靠；支援香港銀行戶口轉賬及多幣種結算。
• Escrow 擔保交易：支援 Escrow.com 平台交易，保障買賣雙方權益，小批量訂單亦可安心在線下單。
• BOM 配單與樣板服務：提供樣板測試及認證支援。專注一站式 BOM 配套及緊急缺料採購服務。

品質保證與合規

Jasin Chip 承諾所有出貨產品均為原廠正貨，具備完善的品質保證及產品可追溯性。

• 100% 原廠正貨：承諾所有供應零件均為原裝現貨，品質嚴格把關，來源清晰可追溯。
• 符合 RoHS 認證：所有電子元器件均符合國際環保標準及相關安全認證。
• 原廠封裝保護：嚴格保留原廠原始包裝及封條，確保物流過程中的靜電防護 (ESD) 與物理安全。

以上產品均為原廠正貨，提供 BOM 配單及現貨庫存支援，歡迎查詢。

HONG KONG JASIN SEMICONDUCTOR TECHNOLOGY COMPANY LIMITED
Trusted Partner for Automotive, Industrial, and Hard-to-find Components.
WhatsApp: +852 5209 9691 | Email: [email protected]