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DS1330W Datasheet

  • DS1330W

  • 3.3V 256K Nonovolatile SRAM with Battery Monitor

  • Dallas   Dallas

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DS1330W
PRELIMINARY
DS1330W
3.3V 256K Nonvolatile SRAM
with Battery Monitor
FEATURES
PIN ASSIGNMENT
鈥?/div>
10 years minimum data retention in the absence of
external power
鈥?/div>
Data is automatically protected during power loss
鈥?/div>
Power
supply monitor resets processor when V
CC
power loss occurs and holds processor in reset during
V
CC
ramp鈥搖p
鈥?/div>
Battery monitor checks remaining capacity daily
鈥?/div>
Read and write access times as fast as 150 ns
鈥?/div>
Unlimited write cycle endurance
鈥?/div>
Typical standby current 50
碌A(chǔ)
鈥?/div>
Upgrade for 32K x 8 SRAM, EEPROM or Flash
鈥?/div>
Lithium battery is electrically disconnected to retain
freshness until power is applied for the first time
BW
NC
NC
RST
V
CC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
GND
V
BAT
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
34鈥揚(yáng)IN POWERCAP MODULE (PCM)
(USES DS9034PC POWERCAP)
PIN DESCRIPTION
A0鈥揂14
DQ0鈥揇Q7
CE
WE
OE
RST
BW
V
CC
GND
NC
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Address Inputs
Data In/Data Out
Chip Enable
Write Enable
Output Enable
Reset Output
Battery Warning Output
Power (+3.3 Volts)
Ground
No Connect
鈥?/div>
Optional
industrial temperature range of 鈥?0擄C to
+85擄C, designated IND
鈥?/div>
New PowerCap Module (PCM) package
鈥?Directly surface鈥搈ountable module
鈥?Replaceable snap鈥搊n PowerCap provides lith-
ium backup battery
鈥?Standardized pinout for all nonvolatile SRAM
products
鈥?Detachment feature on PowerCap allows easy
removal using a regular screwdriver
DESCRIPTION
The DS1330W 3.3V 256K Nonvolatile SRAM is a
262,144鈥揵it, fully static, nonvolatile SRAM organized
as 32,768 words by eight bits. Each NV SRAM has a
self鈥揷ontained lithium energy source and control cir-
cuitry which constantly monitors V
CC
for an out鈥搊f鈥搕ol-
erance condition. When such a condition occurs, the
lithium energy source is automatically switched on and
write protection is unconditionally enabled to prevent
data corruption. Additionally, the DS1330W has dedi-
cated circuitry for monitoring the status of V
CC
and the
status of the internal lithium battery. DS1330W devices
in the PowerCap Module package are directly surface
mountable and are normally paired with a DS9034PC
PowerCap to form a complete Nonvolatile SRAM mod-
ule. The devices can be used in place of 32K x 8 SRAM,
EEPROM or Flash components.
022598 1/11

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