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Teilenummer | DS1350W |
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Beschreibung | 3.3V 4096K Nonvolatile SRAM | |
Hersteller | Dallas Semiconductor | |
Logo | ||
Gesamt 11 Seiten www.DataSheet4U.com
DS1350W
PRELIMINARY
DS1350W
3.3V 4096K Nonvolatile SRAM
with Battery Monitor
FEATURES
• 10 years minimum data retention in the absence of
external power
• Data is automatically protected during power loss
• Power supply monitor resets processor when VCC
power loss occurs and holds processor in reset during
VCC ramp–up
• Battery monitor checks remaining capacity daily
• Read and write access times as fast as 150 ns
• Unlimited write cycle endurance
• Typical standby current 50 µA
• Upgrade for 512K x 8 SRAM, EEPROM or Flash
• Lithium battery is electrically disconnected to retain
freshness until power is applied for the first time
• Optional industrial temperature range of –40°C to
+85°C, designated IND
• New PowerCap Module (PCM) package
– Directly surface–mountable module
– Replaceable snap–on PowerCap provides lith-
ium backup battery
– Standardized pinout for all nonvolatile SRAM
products
– Detachment feature on PowerCap allows easy
removal using a regular screwdriver
PIN ASSIGNMENT
BW
A15
A16
RST
VCC
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 GND VBAT
16
17
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
34–PIN POWERCAP MODULE (PCM)
(USES DS9034PC POWERCAP)
PIN DESCRIPTION
A0–A18
– Address Inputs
DQ0–DQ7 – Data In/Data Out
CE – Chip Enable
WE – Write Enable
OE – Output Enable
RST
– Reset Output
BW – Battery Warning Output
VCC
GND
– Power (+3.3 Volts)
– Ground
NC – No Connect
A18
A17
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
DESCRIPTION
The DS1350W 3.3V 4096K Nonvolatile SRAM is a
4,194,304–bit, fully static, nonvolatile SRAM organized
as 524,288 words by eight bits. Each NV SRAM has a
self–contained lithium energy source and control cir-
cuitry which constantly monitors VCC for an out–of–tol-
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 DS1350W has dedi-
cated circuitry for monitoring the status of VCC and the
status of the internal lithium battery. DS1350W 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 512K x 8
SRAM, EEPROM or Flash components.
022598 1/11
DS1350W
POWER–DOWN/POWER–UP CONDITION
VCC
VTP
2.7V
CE,
WE
tF
tPD
tDR
SLEWS WITH
VCC
BACKUP CURRENT-
SUPPLIED FROM
LITHIUM BATTERY
RST
BW
SEE NOTES 11 AND 14
tRPD
VIL
SLEWS WITH
VCC
BATTERY WARNING DETECTION
VCC
VTP
t BPU
VBAT
2.6V
BATTERY
TEST
ACTIVE
t BTPW
t BTC
BW
SEE NOTE 14
t BW
VIL
tR
tREC
tPU
VIH
tRPU
VIH
tBPU
VIL
022598 6/11
6 Page | ||
Seiten | Gesamt 11 Seiten | |
PDF Download | [ DS1350W Schematic.PDF ] |
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