DS1685 查看數據表（PDF） - Maxim Integrated
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DS1685 Datasheet PDF : 34 Pages
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DS1685/DS1687
3V/5V Real-Time Clocks
FEATURES
Incorporates Industry-Standard DS1287 PC
Clock plus Enhanced Features Such as Y2K
Compliant
+3V or +5V Operation
64-Bit Silicon Serial Number
Power-Control Circuitry Supports System
Power-On from Date/Time Alarm or Key
Closure
32kHz Output for Power Management
Crystal-Select Bit Allows RTC to Operate with
6pF or 12.5pF Crystal
SMI Recovery Stack
242 Bytes Battery-Backed NV RAM
Auxiliary Battery Input
RAM Clear Input
Century Register
Date Alarm Register
Compatible with Existing BIOS for Original
DS1287 Functions
Available as Chip (DS1685) or Stand-Alone
Encapsulated DIP (EDIP) with Embedded
Battery and Crystal (DS1687)
Timekeeping Algorithm Includes Leap-Year
Compensation Valid Through 2099
Underwriters Laboratory (UL) Recognized
APPLICATIONS
Embedded Systems
Utility Meters
Security Systems
Network Hubs, Bridges, and Routers
PIN CONFIGURATIONS
TOP VIEW
PWR
X1
X2
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
1
24
2 DS1685/ 23
3 DS1685S/ 22
4 DS1685E 21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
VCC
SQW
VBAUX
RCLR
VBAT
IRQ
KS
RD
GND
WR
ALE
CS
PDIP (0.600″)/
SO (0.300″)/
TSSOP (0.173″)
AD0
AD1
AD2
AD3
AD4
AD5
N.C.
4 3 2 1 28 27 26
5
25
6
7
DS1685Q
24
23
8
22
9
21
10
20
11
19
12 13 14 15 16 17 18
RCLR
VBAT
IRQ
KS
RD
GND
WR
PLCC
PWR
N.C.
N.C.
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
1
24
2 DS1687 23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
V CC
SQW
V BAUX
RCLR
N.C.
IRQ
KS
RD
N.C.
WR
ALE
CS
EDIP (0.740″)
1 of 34
19-5215; Rev 10/12
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