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参数资料
| 型号： | DS1384FP-12 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR RTC WDOG 120NS 44-MQFP |
| 标准包装： | 96 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出，监视计时器 |
| 存储容量： | 50B |
| 时间格式： | HH:MM:SS:hh（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | 并联 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电压 - 电源，电池： | 2.4 V ~ 4 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 托盘 |
| 其它名称： | DS1384FP12 |
DS1384
2 of 18
DETAILED DESCRIPTION
The DS1384 watchdog timekeeping controller is a self-contained real-time clock, alarm, watchdog timer,
and interval timer that provides control of up to 128k x 8 of external low-power CMOS static RAM in a
44-pin quad flat-pack package. An external crystal and battery are the only components required to
maintain time of day and RAM memory contents in the absence of power. Access to all RTC functions
and the external RAM is the same as conventional bytewide SRAM. Data is maintained in the watchdog
timekeeper by intelligent control circuitry, which detects the status of VCC and write protects both
memory and timekeeping functions when VCC is out of tolerance. Timekeeper information includes
hundredths of seconds, seconds, minutes, hours, day, date, month, and year. The date at the end of the
month is automatically adjusted for months with fewer than 31 days, including correction for leap year.
The timekeeper operates in either 12- or 24-hour format with an AM/PM indicator. The watchdog internal
timer provides watchdog alarm windows and interval timing between 0.01 seconds and 99.99 seconds.
The real time alarm provides for preset times of up to one week. All the RTC functions and the internal
50 bytes of RAM reside in the lower 64 bytes of the attached RAM memory map. The externally attached
static RAM is controlled by the DS1384 via the
OER and CEO signals.
Automatic backup and write protection for an external SRAM is provided through the VCCO, CEO, and
OER pins. The lithium energy source used to permanently power the real time clock is also used to retain
RAM data in the absence of VCC power through the VCCO pin. The chip enable output to RAM (CEO) and
the output enable to RAM (
OER) are controlled during power transients to prevent data corruption. The
DS1384 is a complete one-chip solution in that an external crystal and battery are the only components
required to maintain time of day memory status in the absence of power.
PIN DESCRIPTION
PIN
NAME
FUNCTION
1
INTB/(INTB)
Interrupt Output B (Active High or Low).
INTB outputs the alarm
(time of day or watchdog) that is not selected for
INTA. This pin is
programmable high or low. Both
INTA and INTB/(INTB) are open-
drain outputs. The two interrupts and the internal clock continue to run
regardless of the VCC level. However, it is important to ensure that the
pullup resistors used with the interrupt pins are never pulled up to a
value that is greater than VCC + 0.3V. As VCC falls below
approximately 3.0V, a power-switching circuit turns the lithium
energy source on to maintain the clock and timer data functionality. It
is also required to ensure that during this time (battery-backup mode)
the voltage present at
INTA and INTB/(INTB) never exceeds VBAT.
At all times the current on each should not exceed +2.1mA or -1.0mA.
2
N.C.
No Connection
3
A14
4
A12
5–12
A7–A0
25
A10
27
A11
28
A9
29
A8
30
A13
33
A15
40
A16
Address Bus (Input). The address bus inputs qualified by
CE, OE,
WE, and VCC are used to select the on-chip 64 timekeeping/RAM
registers within the memory map of the external SRAM controlled as
nonvolatile storage. When the qualified address bus value is within the
range of 00000H–0003FH, one of the internal registers is selected and
OER remains inactive. When the value is outside the range, OE is
passed through to
OER.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1384FP-12+ | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1384FP-120 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| DS1384T-120 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| DS1384T-150 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| DS1385 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:RAMified Real Time Clock 4K x 8 |
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