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參數資料
| 型號： | CDP1879 |
| 廠商： | Intersil Corporation |
| 英文描述： | CMOS Real-Time Clock(CMOS 實時時鐘) |
| 中文描述： | CMOS實時時鐘（的CMOS實時時鐘） |
| 文件頁數： | 1/18頁 |
| 文件大?。?/td> | 100K |
| 代理商： | CDP1879 |
4-104
Features
CPU Interface for Use with General-Purpose
Microprocessors
Time Of Day/Calendar
Reads Seconds, Minutes, Hours
Reads Day of Month and Month
Alarm Circuit With Seconds, Minutes or Hours
Operation
Power Down Mode
Separate Clock Output Selects 1 of 15 Square Wave
Signals
Interrupt Output Activated By Clock Output and/or
Alarm Circuit
Date Integrity Sampling for Clock Rollover Eliminated
On-Board Oscillator:
- Crystal Operation CDP1879 at 10V. . . . . . . 4.19MHz,
2.09MHz or 1.048MHz
- Crystal Operation CDP1879C-1 at 5V. . . . . 4.19MHz,
2.09MHz or 1.048MHz or 32kHz
- External Clock Operation at 10V or 5V. . . . 4.19MHz,
2.09MHz, 1.048MHz or 32kHz
Addressable in Memory Space or CDP1800 Series I/O
Mode
Low Standby (Timekeeping) Voltage with External Clock
Related Literature
- AN7275, Guide to the Use of CD1879 and
CDP1879C1 Real Time Clock
Pinout
CDP1879, CDP1879C-1 (PDIP, SBDIP)
TOP VIEW
Description
The CDP1879 real-time clock supplies time and calendar information
from seconds to months in BCD format. It consists of 5 separately
addressable and programmable counters that divide down an oscillator
input. The clock input can have any one of 4 possible frequencies,
allowing flexibility in the choice of crystal or external clock sources.
Using an external 32kHz clock source, timekeeping can be performed
down to 2.5V (see Standby (Timekeeping) Voltage Operation).
The device can be memory-mapped for use with any general-purpose
microprocessor and has the additional capability of operating in the
CDP1800 series input/output mode.
The real-time clock functions as a time-of-day/calendar with an alarm
capability that can be set for combinations of seconds, minutes or
hours. Alarm time is configured by loading alarm latches that activate
an interrupt output through a comparator when the counter and alarm
latch values are equal.
Fifteen selectable square-wave signals are available as a separate
clock output signal and can also activate the interrupt output. A status
register is available to indicate the interrupt source. The value in an 8 bit
control register determines the operational characteristics of the device,
by selecting the prescaler divisor and the clock output, and controls the
load and alarm functions.
A transparent “freeze” circuit preclude clock rollover during counter and
latch access times to assure stable and accurate values in the counters
and alarm latches.
The CDP1879 is functionally identical to the CDP1879C-1. The
CDP1879 has a recommended operating voltage range of 4V to 10.5V,
and the CDP1879C-1 has a recommended operating voltage range of
4V to 6.5V. The CDP1879 and the CDP1879C-1 are supplied in 24 lead
hermetic dual-in-line side-brazed ceramic packages (D suffix) and 24
lead dual-in-line plastic packages (E suffix
).
Ordering Information
1
2
3
4
5
6
7
8
9
10
11
12
INT
RESET
POWER DOWN
RD
IO/MEM
TPB/WR
TPA
CS
A2
A1
A0
V
SS
16
17
18
19
20
21
22
23
24
15
14
13
V
DD
XTAL
XTAL
CLK
OUT
DB7
DB6
DB4
DB2
DB1
DB0
DB5
DB3
PACKAGE
PDIP
TEMP
RANGE
-40
o
C to
+85
o
C
-40
o
C to
+85
o
C
5V
10V
PKG.
NO.
E24.6
CDP1879CE1
CDP1879E
SBDIP
Burn-In
CDP1879CD1
CDP1879CD1X
-
-
D24.6
D24.6
CDP1879 Modes of Operation
OPERATION
FUNCTION
Read
1. Seconds, minutes, hours, date and month counters
2. Status register to identify interrupt source
Write
1. Control register to set device operation
2. Seconds, minutes, hours, date and month counters
3. Alarm latches for alarm time
Power Down
1. Three-state interrupt output with active alarm or
clock out circuitry for wake-up control
2. Data bus and address inputs are “DON’T CARE”
Interrupt
1. Clock out as source
2. Alarm time as source
3. Either interrupt can occur during normal or power
down mode
March 1997
File Number
1360.2
CDP1879,
CDP1879C-1
CMOS Real-Time Clock
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207
|
Copyright
Intersil Corporation 1999
相關PDF資料 |
PDF描述 |
|---|---|
| CDP1879E | CMOS Real-Time Clock |
| CDP1879CE1 | CMOS Real-Time Clock |
| CDP1881CE | CMOS 6-Bit Latch and Decoder Memory Interfaces |
| CDP1881C | CMOS 6-Bit Latch and Decoder Memory Interfaces(CMOS ６位鎖存和解碼存儲器接口) |
| CDP1882 | CMOS 6-Bit Latch and Decoder Memory Interfaces(CMOS ６位鎖存和解碼存儲器接口) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| CDP1879C-1 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS Real-Time Clock |
| CDP1879C1D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC |
| CDP1879C1E | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC |
| CDP1879CD1 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS Real-Time Clock |
| CDP1879CD1X | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS Real-Time Clock |
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