Rainbow Electronics DDS1693 - Manual

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FEATURES
Incorporates industry standard DS1287 PC clock
plus enhanced features:
§ +3- or +5V 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 NV RAM
§ 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 IC (DS1689) or standalone
module with embedded battery and crystal
(DS1693)
§ IC is available in industrial temperature
version
§ Timekeeping algorithm includes leap year
compensation valid up to 2100
ORDERING INFORMATION
PART # DESCRIPTION
DS1689S RTC IC, 28-pin SOIC
DS1689SN RTC IC, 28-pin SOIC IND
DS1693 RTC Module; 28-pin DIP
PIN ASSIGNMENT
PIN DESCRIPTION
X1 - Crystal Input
X2 - Crystal Output
RCLR - RAM Clear Input
AD0-AD7 - Mux’ed Address/Data Bus
PWR - Power-on Interrupt Output
(Open drain)
KS - Kickstart Input
CS - RTC Chip Select Input
ALE - RTC Address Strobe
WR - RTC Write Data Strobe
RD - RTC Read Data Strobe
V
CCO
- RAM Power Supply Output
IRQ - Interrupt Request Output
(Open drain)
SQW - Square Wave Output
V
CCI
- +3- or +5V Main Supply
GND - Ground
V
BAT
- Battery + Supply
V
BAUX
- Auxiliary Battery Supply
PSEL - +3- or +5V Power Select
CEI - RAM Chip Enable In
CEO - RAM Chip Enable Out
DS1689/DS1693
3-Volt/5-Volt Serialized Real-Time Clock
with NV RAM Control
www.maxim-ic.com
V
BAUX
DS1689S 28-Pin SOIC
(330-mil)
13
27
1
2
3
4
5
6
7
8
9
10
11
12
14
28
26
25
24
23
22
21
20
19
18
17
15
16
CEI
V
CCO
SQW
V
BAT
IRQ
PSEL
RD
GND
WR
ALE
KS
CS
CEO
V
CCI
X2
AD0
AD2
AD3
AD4
AD5
AD6
AD7
GND
PWR
X1
RCLR
AD1
GND
DS1693 28-Pin Encapsulated Package
(740-mil)
13
27
NC
AD0
AD2
AD3
AD4
AD5
AD6
AD7
GND
PWR
CEI
V
CCO
SQW
NC
IRQ
PSEL
RD
NC
WR
ALE
KS
CS
1
2
3
4
5
6
7
8
9
10
11
12
14
28
26
25
24
23
22
21
20
19
18
17
15
16
NC
RCLR
AD1
V
BAUX
CEO
V
CCI