Datenblatt-pdf.com


DS1688 Schematic ( PDF Datasheet ) - Dallas Semiconductor

Teilenummer DS1688
Beschreibung (DS1688 / DS1691) 3 Volt/5 Volt Serialized Real Time Clock
Hersteller Dallas Semiconductor
Logo Dallas Semiconductor Logo 




Gesamt 5 Seiten
DS1688 Datasheet, Funktion
www.DataSheet4U.com
DS1688/DS1691
DS1688/DS1691
3 Volt/5 Volt Serialized Real Time Clock
with NV RAM Control
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 VCC powered elapsed time counter
32–bit VBAT 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
VBAUX
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 CEI
27 CEO
26 VCCI
25 VCCO
24 SQW
23 VBAT
22 IRQ
21 PSEL
20 RD
19 GND
18 WR
17 ALE
16 CS
15 KS
DS1688 28–PIN DIP
(600 MIL)
VBAUX
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
VBAUX
X1
X2
RCLR
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
PWR
GND
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1 28 CEI
2 27 CEO
3 26 VCCI
4 25 VCCO
5 24 SQW
6 23 VBAT
7 22 IRQ
8 21 PSEL
9 20 RD
10 19 GND
11 18 WR
12 17 ALE
13 16 CS
14 15 KS
DS1688S 28–PIN SOIC
(330 MIL)
CEI
CEO
VCCI
VCCO
SQW
NC
IRQ
PSEL
RD
NC
WR
ALE
CS
KS
DS1691 28–PIN ENCAPSU-
LATED PACKAGE (740 MIL)
PIN DESCRIPTION
X1 – Crystal Input
X2 – Crystal Output
RCLR
– RAM Clear Input
AD0-AD7
– Mux’ed Address/Data Bus
PWR
– Power–on Interrupt Output
KS – Kickstart Input
CS – RTC Chip Select Input
ALE – RTC Address Strobe
WR – RTC Write Data Strobe
RD – RTC Read Data Strobe
VCCO
– RAM Power Supply Output
030598 1/5





SeitenGesamt 5 Seiten
PDF Download[ DS1688 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
DS1680Portable System ControllerDallas Semiconductor
Dallas Semiconductor
DS1682Total-Elapsed-Time RecorderMaxim Integrated
Maxim Integrated
DS1682Total Elapsed Time RecorderDallas Semiconductor
Dallas Semiconductor
DS1683Total-Elapsed-Time and Event RecorderMaxim Integrated
Maxim Integrated
DS1685(DS1685 / DS1687) 3V/5V Real-Time ClocksMaxim Integrated Products
Maxim Integrated Products

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche