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参数资料
| 型号： | RTC-72421A |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP18 |
| 封装： | DIP-18 |
| 文件页数： | 22/26页 |
| 文件大小： | 192K |
| 代理商： | RTC-72421A |
RTC - 72421 / 72423
Page - 1
MQ162-04
4-BIT PARALLEL INTERFACE REAL TIME CLOCK MODULE
RTC - 72421 / 72423
Built-in crystal unit removes need for adjustment and reduces installation costs
Microprocessor bus compatible ( tWW, tRD = 120 ns )
Use of C-MOS IC enables low current consumption ( 5 A Max., at VDD = 2.0 V )
Compatibility with Intel CPU bus
Address latch enable (ALE) pin compatible with multiplex bus CPUs
Time (hours, minutes, seconds) and calendar (year, month, day) counter
24-hour/12-hour switchover and automatic leap-year correction functions
Fixed-period interrupt function
30-seconds correction (adjustment) function
Stop, start, and reset functions
Battery back-up function
Same mounting conditions as general-purpose SMD ICs possible (RTC-72423)
Pins and functions compatible with the SMC-5242 series
! Overview
The RTC-72421/RTC-72423 module is a real time clock that can be connected directly to a microprocessor's bus. Its built-in crystal
unit enables highly accurate time-keeping with no physical access required for adjustment and, since there is no need to connect
external components, mounting and other costs can be reduced.
In addition to its time and calendar functions, the RTC-72421/RTC-72423 enables the use of 30-seconds correction and fixed-
period interrupt functions.
The RTC-72421/RTC-72423 module is ideally suited for applications requiring timing management, such as personal computers,
dedicated word-processors, fax machines, multi-function telephones, and sequencers.
! Block diagram
OSC
RESET
bit
STOP
bit
30sec ADJ
bit
Counter
HOLD
bit
BUSY
bit
D3
D2
D1
D0
WR
RD
A3
A2
A1
A0
CS0
ALE
CS1
S1
S10
MI1
MI10
H1
H10
W
D1
D10
MO1
MO10
Y1
Y10
64 Hz
1 Second carry
1 Minute carry
1 Hour carry
S1 to CF
CD
CE
CF
Gate
Latch
Decoder
24/12
bit
RTC-72421/72423
STD.P
Output Selector
相关PDF资料 |
PDF描述 |
|---|---|
| RTC-72421B | 0 TIMER(S), REAL TIME CLOCK, PDIP18 |
| RTC-72423A-0 | 0 TIMER(S), REAL TIME CLOCK, PDSO24 |
| RTC-72423B-0 | REAL TIME CLOCK, PDSO24 |
| RTC-72423A-0 | 0 TIMER(S), REAL TIME CLOCK, PDSO24 |
| RTC-72423B-0 | REAL TIME CLOCK, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| RTC72421AROHS | 制造商:Epson Electronics America Inc 功能描述:Real Time Clock Parallel 18-Pin PDIP |
| RTC72421B | 制造商:Epson Toyocom Corporation 功能描述:IC RTC 72421 DIP18 制造商:Epson Toyocom Corporation 功能描述:IC, RTC, 72421, DIP18 制造商:Epson Toyocom Corporation 功能描述:IC, RTC; Clock Format:12Hr / 24Hr; Clock IC Type:RTC; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; Digital IC Case Style:DIP; No. of Pins:18; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:18-DIP;RoHS Compliant: Yes |
| RTC-72421B | 功能描述:IC REAL TIME CLOCK 18-DIP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
| RTC-72421B PURE SN | 制造商:Epson Electronics America Inc 功能描述:REAL TIME CLOCK MODULE 4-BIT |
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