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DS1543 Datasheet

  • DS1543

  • 64K NV Timekeeping RAM

  • Dallas   Dallas

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PRELIMINARY
DS1543
64k NV Timekeeping RAM
www.dalsemi.com
FEATURES
Integrated NV SRAM, real time clock, crystal,
power-fail control circuit and lithium energy
source
Clock registers are accessed identical to the
static RAM. These registers are resident in the
sixteen top RAM locations
Totally nonvolatile with over 10 years of
operation in the absence of power
Precision Power-On Reset
Programmable Watchdog Timer and RTC
Alarm
BCD coded year, month, date, day, hours,
minutes, and seconds with automatic leap year
compensation valid up to the year 2100
Battery voltage level indicator flag
Power-fail write protection allows for
鹵10%
Vcc power supply tolerance
Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
PIN ASSIGNMENT
RST
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
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
V
CC
WE
IRQ/FT
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
28-Pin Encapsulated Package
(700 Mil Extended)
PIN DESCRIPTION
A0-A12
DQ0-DQ7
IRQ
\FT
RST
CE
OE
WE
ORDERING INFORMATION
DS1543-XXX
(5V)
-70
-100
70 ns access
100 ns access
*DS1543W-XXX
(3.3V)
-120 120 ns access
-150 150 ns access
V
CC
GND
NC
- Address Input
- Data Input/Outputs
- Interrupt, Frequency Test
Output (Open-Drain)
- Power-On Reset Output
(Open-Drain)
- Chip Enable
- Output Enable
- Write Enable
- Power Supply Input
- Ground
- No Connection
1 of 17
081000

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