DS1557P 查看數據表（PDF） - Maxim Integrated
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DS1557P Datasheet PDF : 17 Pages
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19-5501; Rev 9/10
www.maxim-ic.com
DS1557
4Meg, Nonvolatile, Y2K-Compliant
Timekeeping RAM
FEATURES
Integrated NV SRAM, Real-Time Clock
(RTC), Crystal, Power-Fail Control Circuit,
and Lithium Energy Source
Clock Registers are Accessed Identically to
the Static RAM; These Registers Reside in the
16 Top RAM Locations
Century Byte Register (i.e., Y2K Compliant)
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%
VCC Power-Supply Tolerance
Lithium Energy Source is Electrically
Disconnected to Retain Freshness Until Power
is Applied for the First Time
Also Available in Industrial Temperature
Range: -40°C to +85°C
PIN CONFIGURATION
TOP VIEW
IRQ/FT 1
34
A18
A15 2
Maxim
33
A17
A16 3
RST 4
VCC
WE
5
6
DS1557
32
A14
31
30
A13
A12
29
A11
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
7
28
8
27
9
26
10
25
11
24
12
23
13
22
14
21
15
20
16
17
X1 GND VBAT X2
19
18
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
PowerCap Module Board
(Uses DS9034PCX PowerCap)
PIN DESCRIPTION
A0–A18
- Address Input
DQ0–DQ7
IRQ/FT
- Data Input/Outputs
- Interrupt, Frequency Test
Output (Open Drain)
RST
- Power-On Reset Output
(Open Drain)
CE
- Chip Enable
OE
- Output Enable
WE
- Write Enable
VCC
GND
- Power-Supply Input
- Ground
X1, X2
- Crystal Connection
VBAT
- Battery Connection
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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