最新免费av在线观看,亚洲综合一区成人在线,中文字幕精品无码一区二区三区,中文人妻av高清一区二区,中文字幕乱偷无码av先锋

DS1557 Datasheet

  • DS1557

  • 4MEG NV Y2KC Timekeeping RAM

  • Dallas   Dallas

掃碼查看芯片數(shù)據手冊

上傳產品規(guī)格書

PDF預覽

PRELIMINARY
DS1557
4MEG NV Y2KC Timekeeping RAM
www.dalsemi.com
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
鹵10%
V
CC
power supply tolerance
Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
PIN ASSIGNMENT
IRQ/FT
A15
A16
RST
V
CC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
A18
A17
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
X1
GND V
BAT
X2
34-Pin POWERCAP MODULE BOARD
(USES DS9034PCX POWERCAP)
PIN DESCRIPTION
A0-A14
DQ0-DQ7
IRQ
\FT
RST
CE
OE
WE
ORDERING INFORMATION
(5-Volt)
-70
70 ns access
-100 100 ns access
*DS1557WP-XXX (3.3 Volt)
-120 120 ns access
-150 150 ns access
*DS9034PCX (PowerCap) Required:
must be ordered seperately
DS1557P-XXX
V
CC
GND
NC
X1, X2
V
BAT
- 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
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.
1of 19
012700

DS1557 PDF文件相關型號

DS1557P-100,DS1557P-70

DS1557相關型號PDF文件下載

您可能感興趣的PDF文件資料

熱門IC型號推薦

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買家服務：
賣家服務：
技術客服：

0571-85317607

網站技術支持

13606545031

客服在線時間周一至周五
9:00-17:30

關注官方微信號，
第一時間獲取資訊。

建議反饋
返回頂部

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫提出的寶貴意見，您的參與是維庫提升服務的動力！意見一經采納，將有感恩紅包奉上哦！