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Dallas Semiconducotr - 64k NV Timekeeping RAM

Numéro de référence DS1543
Description 64k NV Timekeeping RAM
Fabricant Dallas Semiconducotr 
Logo Dallas Semiconducotr 





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DS1543 fiche technique
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 ±10%
Vcc power supply tolerance
Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
ORDERING INFORMATION
DS1543-XXX
(5V)
-70 70 ns access
-100 100 ns access
*DS1543W-XXX
(3.3V)
-120 120 ns access
-150 150 ns access
PRELIMINARY
DS1543
64k NV Timekeeping RAM
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 VCC
27 WE
26 IRQ/FT
25 A8
24 A9
23 A11
22 OE
21 A10
20 CE
19 DQ7
18 DQ6
17 DQ5
16 DQ4
15 DQ3
28-Pin Encapsulated Package
(700 Mil Extended)
PIN DESCRIPTION
A0-A12
- Address Input
DQ0-DQ7 - Data Input/Outputs
IRQ \FT
- Interrupt, Frequency Test
Output (Open-Drain)
RST - Power-On Reset Output
(Open-Drain)
CE - Chip Enable
OE - Output Enable
WE
VCC
GND
NC
- Write Enable
- Power Supply Input
- Ground
- No Connection
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