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DS1330W Schematic ( PDF Datasheet ) - Dallas Semiconducotr

Teilenummer DS1330W
Beschreibung 3.3V 256K Nonvolatile SRAM with Battery Monitor
Hersteller Dallas Semiconducotr
Logo Dallas Semiconducotr Logo 




Gesamt 11 Seiten
DS1330W Datasheet, Funktion
DS1330W
PRELIMINARY
DS1330W
3.3V 256K 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 32K 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
NC
NC
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–A14
– 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
NC
NC
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
DESCRIPTION
The DS1330W 3.3V 256K Nonvolatile SRAM is a
262,144–bit, fully static, nonvolatile SRAM organized
as 32,768 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 DS1330W has dedi-
cated circuitry for monitoring the status of VCC 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






DS1330W Datasheet, Funktion
DS1330W
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
022598 6/11
tR
tREC
tPU
VIH
tRPU
VIH
tBPU
VIL

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