DS1744WP120(2010) 查看數據表（PDF） - Maxim Integrated
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DS1744WP120 Datasheet PDF : 16 Pages
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19-5502; Rev 9/10
DS1744/DS1744P
Y2K-Compliant, Nonvolatile Timekeeping RAMs
www.maxim-ic.com
FEATURES
PIN CONFIGURATIONS
Integrated NV SRAM, Real-Time Clock,
Crystal, Power-Fail Control Circuit, and
TOP VIEW
Lithium Energy Source
Clock Registers are Accessed Identically to
A14 1
28 VCC
A12 2 DS1744 27 WE
the Static RAM. These Registers are Resident
in the Eight Top RAM Locations.
Century Byte Register (i.e., 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%
A7 3
A6 4
A5 5
A4 6
A3 7
A2 8
A1 9
A0 10
DQ0 11
DQ1 12
DQ2 13
GND 14
26 A13
25 A8
24 A9
23 A11
22 OE
21 A10
20 CE
19 DQ7
18 DQ6
17 DQ5
16 DQ4
15 DQ3
EDIP
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 32k 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
N.C. 1
34
N.C. 2
N.C. 3
DS1744P
33
32
RST 4
31
VCC
WE
5
6
OE 7
CE 8
DQ7 9
30
29
28
27
26
DQ6 10
25
DQ5 11
24
DQ4 12
23
DQ3 13
22
DQ2 14
DQ1 15
21
20
DQ0
GND
16
17
X1 GND VBAT X2
19
18
N.C.
N.C.
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
PowerCap MODULE BOARD
(Uses DS9034PCX PowerCap)
Range: -40°C to +85°C
UL Recognized
1 of 18
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