DS1685 Datasheet, PDF (1/33 Pages) Maxim Integrated Products – 3V/5V Real-Time Clocks

www.maxim-ic.com
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
DS1685/DS1687
3V/5V Real-Time Clocks
§ 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
DIP (0.600”)/
SO (0.300”)/
TSSOP (0.173”)
PACKAGE DIMENSION
INFORMATION
www.maxim-ic.com/DallasPackInfo
AD0
AD1
AD2
AD3
AD4
AD5
N.C.
4 3 2 1 28 27 26
5
25
6 _DS1685Q 24
7
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
EDIP (740 mil)
V_CC
SQW
V_BAUX
RCLR
N.C.
IRQ
KS
RD
N.C.
WR
ALE
CS
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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REV: 032604