DS1345Y Maxim, DS1345Y Datasheet

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DS1345Y

Manufacturer Part Number
DS1345Y
Description
The DS1345 1024k Nonvolatile (NV) SRAMs are 1,048,576-bit, fully static, NV SRAMs organized as 131,072 words by 8 bits
Manufacturer
Maxim
Datasheet

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19-5589; Rev 10/10
FEATURES
 10 years minimum data retention in the
 Power supply monitor resets processor when
 Battery monitor checks remaining capacity
 Read and write access times of 70ns
 Unlimited write cycle endurance
 Typical standby current 50µA
 Upgrade for 128k x 8 SRAM, EEPROM or
 Lithium battery is electrically disconnected to
 Full ±10% V
 Optional industrial temperature range of
 PowerCap Module (PCM) package
DESCRIPTION
The DS1345 1024k NV SRAMs are 1,048,576-bit, fully static, NV SRAMs organized as 131,072 words
by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry which
constantly monitors V
energy source is automatically switched on and write protection is unconditionally enabled to prevent
data corruption. Additionally, the DS1345 devices have dedicated circuitry for monitoring the status of
V
directly surface mountable and are normally paired with a DS9034PC PowerCap to form a complete NV
SRAM module. The devices can be used in place of 128k x 8 SRAM, EEPROM, or Flash components.
www.maxim-ic.com
CC
absence of external power
Data is automatically protected during power
loss
V
reset during V
daily
Flash
retain freshness until power is applied for the
first time
or optional ±5% V
(DS1345AB)
-40°C to +85°C, designated IND
-
-
-
-
and the status of the internal lithium battery. DS1345 devices in the PowerCap module package are
CC
Directly surface-mountable module
Replaceable snap-on PowerCap provides
lithium backup battery
Standardized pinout for all nonvolatile
(NV) SRAM products
Detachment feature on PowerCap allows
easy removal using a regular screwdriver
power loss occurs and holds processor in
CC
CC
operating range (DS1345Y)
ramp-up
CC
CC
operating range
for an out-of-tolerance condition. When such a condition occurs, the lithium
1 of 10
PIN ASSIGNMENT
PIN DESCRIPTION
A0 – A16
DQ0 – DQ7
V
GND
NC
CE
WE
OE
RST
BW
(Uses DS9034PC+ or DS9034PCI+ PowerCap)
GND
CC
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
RST
A15
A16
BW
V
WE
OE
CE
CC
1024k Nonvolatile SRAM
34-Pin PowerCap Module (PCM)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
with Battery Monitor
GND V
- Address Inputs
- Data In/Data Out
- Chip Enable
- Write Enable
- Output Enable
- Reset Output
- Battery Warning Output
- Power (+5V)
- Ground
- No Connect
BAT
DS1345Y/AB
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
NC
NC
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0

DS1345Y Summary of contents

Page 1

... Typical standby current 50µA  Upgrade for 128k x 8 SRAM, EEPROM or Flash  Lithium battery is electrically disconnected to retain freshness until power is applied for the first time  Full ±10% V operating range (DS1345Y optional ±5% V operating range CC (DS1345AB)  Optional industrial temperature range of -40° ...

Page 2

... V to the RAM and disconnects the lithium energy source. Normal RAM operation CC can resume after V exceeds 4.75V for the DS1345AB and 4.5V for the DS1345Y. CC SYSTEM POWER MONITORING DS1345 devices have the ability to monitor the external V power supply condition is detected, the NV SRAMs warn a processor-based system of impending power failure by asserting ...

Page 3

... After a DS1345 PCM is reflow soldered, a DS9034PC is snapped on top of the PCM to form a complete NV SRAM module. The DS9034PC is keyed to prevent improper attachment. DS1345 PowerCap modules and DS9034PC PowerCaps are ordered separately and shipped in separate containers. See the DS9034PC data sheet for further information DS1345Y/AB ...

Page 4

... DS1345Y/AB -0.3V to +6.0V 0°C to +70°C -40°C to +85°C -55°C to +125° See Note 10) A TYP MAX UNITS 5.0 5.25 V 5 ± 5% for DS1345AB ± 10% for DS1345Y) CC TYP MAX UNITS µA +1.0 µA +1 µA 200 600 µA 50 150 85 mA 4.62 4.75 V 4.37 4 +25° ...

Page 5

... WR1 t 12 WR2 t ODW t 5 OEW DH1 t 7 DH2 DS1345Y/ ± 5% for DS1345AB ± 10% for DS1345Y) CC UNITS NOTES MAX ...

Page 6

... WRITE CYCLE 1 SEE NOTES and 12 WRITE CYCLE 2 SEE NOTES and DS1345Y/AB ...

Page 7

... POWER-DOWN/POWER-UP CONDITION SEE SEE NOTES 11 AND 14 BATTERY WARNING DETECTION SEE NOTE DS1345Y/AB ...

Page 8

... See Note 10) A TYP MAX UNITS TYP MAX UNITS years is measured from the latter of low transition, the output WE high transition, the output WE low transition, CE DS1345Y/AB NOTES NOTES = +25°C) NOTES ...

Page 9

... TOLERANCE 0°C to +70°C -40°C to +85°C 5V ± 10% 0°C to +70°C 5V ± 10% -40°C to +85°C OUTLINE NO. PC2 starting from the time power PIN-PACKAGE 5V ± PCAP* 5V ± PCAP* 34 PCAP* 34 PCAP* LAND PATTERN NO. 21-0246 DS1345Y/ Note — ...

Page 10

... Updated the storage, lead, and soldering information in the Absolute Maximum Ratings section, removed the unused AC timing specs in 10/10 the AC Electrical Characteristics table, updated the Ordering Information table, replaced the package outline drawing with the Package Information table DESCRIPTION DS1345Y/AB PAGES CHANGED ...

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