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參數(shù)資料
| 型號(hào)： | DS1644P |
| 英文描述： | Nonvolatile Timekeeping RAM |
| 中文描述： | 非易失時(shí)鐘RAM |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 302K |
| 代理商： | DS1644P |
DS1644/DS1644P
2 of 13
PIN DESCRIPTION
PIN
PDIP
PowerCap
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
-
NAME
FUNCTION
32
30
25
24
23
22
21
20
19
18
16
15
14
17
13
12
11
10
9
8
28
7
29
27
26
31
6
5
4
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
DQ3
DQ4
DQ5
DQ6
DQ7
CE
A10
OE
A11
A9
A8
A13
WE
V
CC
Address Input
Data Input/Output
Ground
Data Input/Output
Active Low Chip-Enable Input
Address Input
Active Low Output-Enable Input
Address Input
Active-Low Write-Enable Input
Power-Supply Input
Active-Low Reset Output, Open Drain. Requires a pullup resistor for
proper operation.
No Connection
RST
-
-
1-3,33,34
NC
X1, X2,
V
BAT
Crystal Connection V
BAT
Battery Connection
DESCRIPTION
The DS1644 is a 32k x 8 nonvolatile static RAM with a full function real time clock, which are both
accessible in a byte-wide format. The nonvolatile timekeeping RAM is functionally equivalent to any
JEDEC standard 32k x 8 SRAM. The device can also be easily substituted for ROM, EPROM and
EEPROM, providing read/write nonvolatility and the addition of the real time clock function. The real
time clock information resides in the eight uppermost RAM locations. The RTC registers contain year,
month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for the day of the
month and leap year are made automatically. The RTC clock registers are double-buffered to avoid access
of incorrect data that can occur during clock update cycles. The double-buffered system also prevents
time loss as the timekeeping countdown continues unabated by access to time register data. The DS1644
also contains its own power-fail circuitry, which deselects the device when the V
CC
supply is in an out-of-
tolerance condition. This feature prevents loss of data from unpredictable system operation brought on by
low V
CC
as errant access and update cycles are avoided.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1644P-120 | Nonvolatile Timekeeping RAM |
| DS1644J | Quad Clock Driver |
| DS1648J | 2-Input Digital Multiplexer |
| DS3644J | 800mA, Low-Voltage, DC-DC Step-Up Converter, Logic-High On - TDFN-10 |
| DS3644N | Low Voltage, 1.2 MHz, Micropower, DC-DC Step-Up Converter, Powersave Operation (medium loads), shutdown battery feedthrough - TSOT23-6 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1644P+120 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM |
| DS1644P-120 | 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1644P120+ | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM |
| DS1644P-120+ | 功能描述:實(shí)時(shí)時(shí)鐘 NV Timekeeping RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1644P-150 | 制造商:Maxim Integrated Products 功能描述: |
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