DS17287(1998) Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS17287 Datasheet PDF : 32 Pages
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DS17285/DS17287
DS17285/DS17287
3 Volt/5 Volt Real Time Clock
FEATURES
Incorporates industry standard DS1287 PC clock plus
enhanced features:
• +3 or +5 volt operation
• SMI recovery stack
• 64–bit silicon serial number
• Power control circuitry supports system power on
from date/time alarm or key closure
• 32 KHz output on power–up
• Crystal select bit allows RTC to operate with 6 pF or
12.5 pF crystal
• 114 bytes user NVRAM
• 2K bytes of additional NVRAM
• Auxiliary battery input
• RAM clear input
• Century register
• Date alarm register
• Compatible with existing BIOS for original DS1287
functions
• Available as chip (DS17285) or standalone module
with embedded battery and crystal (DS17287)
• Timekeeping algorithm includes leap year compensa-
tion valid up to 2100
ORDERING INFORMATION
PART #
DS17285–X
DS17285S–X
DS17285E–X
DS17287–X
DESCRIPTION
RTC Chip; 24–pin DIP
RTC Chip; 24–pin SOIC
RTC Chip; 28–pin TSOP
RTC Module; 24–pin DIP
–3 +3 volt device
–5 +5 volt device
PIN ASSIGNMENT
PWR 1
X1 2
X2 3
AD0 4
AD1 5
AD2 6
AD3 7
AD4 8
AD5 9
AD6 10
AD7 11
GND 12
24
VCC
23 SQW
22
VBAUX
21 RCLR
20
VBAT
19 IRQ
18 KS
17 RD
16 GND
15 WR
14 ALE
13 CS
DS17285 24–PIN DIP
DS17285S 24–PIN SOIC
PWR 1
NC 2
NC 3
AD0 4
AD1 5
AD2 6
AD3 7
AD4 8
AD5 9
AD6 10
AD7 11
GND 12
24 VCC
23 SQW
22 VBAUX
21 RCLR
20 NC
19 IRQ
18 KS
17 RD
16 NC
15 WR
14 ALE
13 CS
DS17287 24–PIN ENCAPSULATED PACKAGE
IRQ
1
VBAT
2
RCLR
3
VBAUX
4
SQW
5
VCC
6
VCC
7
PWR
8
X1
9
X2
10
NC
11
AD0
12
AD1
13
AD2
14
DS17285E 28–PIN TSOP
28
KS
27
RD
26
GND
25
WR
24
ALE
23
CS
22
GND
21
GND
20
AD7
19
AD6
18
NC
17
AD5
16
AD4
15
AD3
030598 1/32
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