參數(shù)資料
型號(hào)： DS1557WP-120
英文描述： 4MEG NV Y2KC Timekeeping RAM
中文描述： 4MEG非易失Y2KC時(shí)鐘內(nèi)存
文件頁數(shù)： 1/19頁
文件大小： 268K
代理商： DS1557WP-120
1of 19
012700
FEATURES
Integrated NV SRAM, real time clock, crystal,
power-fail control circuit and lithium energy
source
Clock registers are accessed identically to the
static RAM; these registers are resident in the
16 top RAM locations
Century byte register; i.e., Y2K complaint
Totally nonvolatile with over 10 years of
operation in the absence of power
Precision power-on reset
Programmable watchdog timer and RTC alarm
BCD coded year, month, date, day, hours,
minutes, and seconds with automatic leap year
compensation valid up to the year 2100
Battery voltage level indicator flag
Power-fail write protection allows for
±
10%
V
CC
power supply tolerance
Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
ORDERING INFORMATION
DS1557P-XXX
(5-Volt)
-70
-100
(3.3 Volt)
-120
-150
70 ns access
100 ns access
*DS1557WP-XXX
120 ns access
150 ns access
*DS9034PCX (PowerCap) Required:
must be ordered seperately
PIN ASSIGNMENT
PIN DESCRIPTION
A0-A14
DQ0-DQ7
IRQ
\FT
- Address Input
- Data Input/Outputs
- Interrupt, Frequency Test
Output (Open Drain)
- Power-On Reset Output
(Open Drain)
- Chip Enable
- Output Enable
- Write Enable
- Power Supply Input
- Ground
- No Connection
- Crystal Connection
- Battery Connection
RST
CE
OE
WE
V
CC
GND
NC
X1, X2
V
BAT
DESCRIPTION
The DS1557 is a full function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) with a RTC
alarm, watchdog timer, power-on reset, battery monitor, and 512k x 8 non-volatile static RAM. User
access to all registers within the DS1557 is accomplished with a bytewide interface as shown in Figure 1.
The RTC Registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour
BCD format. Corrections for day of month and leap year are made automatically.
DS1557
4MEG NV Y2KC Timekeeping RAM
PRELIMINARY
www.dalsemi.com
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
IRQ/FT
A15
A16
RST
V
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
33
A17
X1
GND V
BAT
X2
34-Pin POWERCAP MODULE BOARD
(USES DS9034PCX POWERCAP)
相關(guān)PDF資料
PDF描述
DS1557WP-150 4MEG NV Y2KC Timekeeping RAM
DS1557 4MEG NV Y2KC Timekeeping RAM
DS1558 Watchdog Clock with NV RAM Control
DS1558W Watchdog Clock with NV RAM Control
DS1558Y Watchdog Clock with NV RAM Control
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1557WP-120+ 功能描述:實(shí)時(shí)時(shí)鐘 4M NV RAM Timekeeper 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
DS1557WP-120IND 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
DS1557WP-120IND+ 功能描述:實(shí)時(shí)時(shí)鐘 4M NV RAM Timekeeper 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
DS1557WP-150 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:4MEG NV Y2KC Timekeeping RAM
DS1558 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Watchdog Clock with NV RAM Control
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