DS1747-70 查看數據表（PDF） - Maxim Integrated
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DS1747-70 Datasheet PDF : 16 Pages
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DS1747/DS1747P
Y2K-Compliant, Nonvolatile Timekeeping RAMs
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 are
Resident in the Eight Top RAM Locations
Century Byte Register (Y2K Compliant)
Totally Nonvolatile with Over 10 Years of
Operation in the Absence of Power
BCD-Coded Century, 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
DIP Module Only:
Standard JEDEC Byte-Wide 512k x 8 Static
RAM Pinout
PowerCap Module Board Only:
Surface-Mountable Package for Direct
Connection to PowerCap Containing
Battery and Crystal
Replaceable Battery (PowerCap)
Power-On Reset Output
Pin-for-Pin Compatible with Other Densities
of DS174xP Timekeeping RAM
Also Available in Industrial Temperature
Range: -40°C to +85°C
PIN CONFIGURATIONS
TOP VIEW
A18
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
32
2 Maxim 31
3 DS1747 30
4
29
5
28
6
27
7
26
8
25
9
24
10
23
11
22
12
21
13
20
14
19
15
18
16
17
VCC
A15
A17
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
Encapsulated DIP
(512k x 8)
N.C. 1
A15 2
Maxim
34
A18
33
A17
A16 3
DS1747P
32
A14
RST
4
31
A13
VCC
WE
5
6
30
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+ or DS9034I-PCX+ PowerCap)
1 of 16
19-5504; Rev 6/13
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