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參數資料
| 型號： | DS1691 |
| 英文描述： | 3 Volt/5 Volt Serialized Real Time Clock with NV RAM Control |
| 文件頁數： | 1/5頁 |
| 文件大小： | 46K |
| 代理商： | DS1691 |
DS1688/DS1691
3 Volt/5 Volt Serialized Real Time Clock
with NV RAM Control
DS1688/DS1691
030598 1/5
FEATURES
Incorporates industry standard DS1287 PC clock plus
enhanced features:
+3 or +5 volt operation
64–bit Silicon serial number
64–bit customer specific ROM or additional serial
number available
Power control circuitry supports system power on
from date/time alarm or key closure
Automatic battery backup and write protection to
external SRAM
Crystal select bit allows RTC to operate with 6 pF or
12.5 pF crystal
114 bytes user NVRAM
Auxiliary battery input
RAM clear input
Century register
32 KHz output for power management
32–bit V
CC
powered elapsed time counter
32–bit V
BAT
powered elapsed time counter
16–bit power cycle counter
Compatible with existing BIOS for original DS1287
functions
Available as chip (DS1688) or stand–alone module
with embedded battery and crystal (DS1691)
Timekeeping algorithm includes leap year compensa-
tion valid up to 2100
ORDERING INFORMATION
PART #
DS1688
DS1688S
DS1691
DESCRIPTION
RTC Chip, 28–pin DIP
RTC Chip, 28–pin SOIC
RTC Module; 28–pin DIP
PIN ASSIGNMENT
V
BAUX
X1
X2
RCLR
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
PWR
GND
CEI
CEO
V
CCI
V
CCO
SQW
V
BAT
IRQ
PSEL
RD
GND
WR
ALE
CS
KS
V
BAUX
X1
X2
RCLR
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
PWR
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
CEI
CEO
V
CCI
V
CCO
SQW
V
BAT
IRQ
PSEL
RD
GND
WR
ALE
CS
KS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DS1688 28–PIN DIP
(600 MIL)
DS1688S 28–PIN SOIC
(330 MIL)
CEI
CEO
V
CCI
V
CCO
SQW
NC
IRQ
PSEL
RD
NC
WR
ALE
CS
KS
V
BAUX
NC
NC
RCLR
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
PWR
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DS1691 28–PIN ENCAPSU-
LATED PACKAGE (740 MIL)
PIN DESCRIPTION
X1
X2
RCLR
AD0-AD7
PWR
KS
CS
ALE
WR
RD
V
CCO
– Crystal Input
– Crystal Output
– RAM Clear Input
– Mux’ed Address/Data Bus
– Power–on Interrupt Output
– Kickstart Input
– RTC Chip Select Input
– RTC Address Strobe
– RTC Write Data Strobe
– RTC Read Data Strobe
– RAM Power Supply Output
相關PDF資料 |
PDF描述 |
|---|---|
| DS1689 | 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control |
| DS1689S | 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control |
| DS1689SN | 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control |
| DS1693 | 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control |
| DS1699-010 | ELECTRONIC DIGITAL RHEOSTAT |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DS1691 WAF | 制造商:Texas Instruments 功能描述: |
| DS1691/1692 WAF | 制造商:Texas Instruments 功能描述: |
| DS1691A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:(RS-422/RS-423) Line Drivers with TRI-STATE Outputs |
| DS1691AJ/883 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:(RS-422/RS-423) Line Drivers with TRI-STATE Outputs |
| DS1691AJ/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Line Driver |
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