DS1323_1205 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – 3.3V Flexible Nonvolatile Controller with Lithium Battery Monitor

19-5920; Rev 5/12
DS1323
3.3V Flexible Nonvolatile Controller with
Lithium Battery Monitor
FEATURES
 Converts CMOS SRAM into nonvolatile
memory
 Unconditionally write-protects SRAM when
V_CC is out of tolerance
 Automatically switches to battery backup
when V_CC power failure occurs
 Flexible memory organization
- Mode 0: 4 banks with 1 SRAM each
- Mode 1: 2 banks with 2 SRAMs each
- Mode 2: 1 bank with 4 SRAMs each
 Monitors voltage of a lithium cell and
provides advanced warning of impending
battery failure
 Signals low-battery condition on active low
battery warning output signal
 Resets processor when power failure occurs
and holds processor in reset during system
power-up
 10% power-fail detection
 Industrial temperature range of -40°C to
+85°C
PIN ASSIGNMENT
VCCO
1
VBAT
2
NC 3
CEI1 4
CEI2 5
NC 6
A/CEI3 7
B/CEI4 8
NC 9
GND 10
20
VCCI
19 RST
18 BW
17 CEO1
16 CEO2
15 NC
14 CEO3
13 CEO4
12 NC
11 MODE
DS1323E 20-Pin TSSOP
(173 mils)
PIN DESCRIPTION
V_CCI
V_CCO
V_BAT
A, B
- +3.3V Power Supply Input
- SRAM Power Supply Output
- Backup Battery Input
- Address Inputs
CEI1 - CEI4 - Chip Enable Inputs
CEO1 - CEO4 - Chip Enable Outputs
BW
- Battery Warning Output (Open
Drain)
RST
- Reset Output (Open Drain)
MODE
- Mode Input
GND
- Ground
NC
- No Connection
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