DS1245AB-120IND+ [ROCHESTER]
128KX8 NON-VOLATILE SRAM MODULE, 120ns, DMA32, 0.740 INCH, LEAD FREE, EXTENDED MODULE, DIP-32;
| 型号： | DS1245AB-120IND+ |
| 厂家： | 
Rochester Electronics |
| 描述： | 128KX8 NON-VOLATILE SRAM MODULE, 120ns, DMA32, 0.740 INCH, LEAD FREE, EXTENDED MODULE, DIP-32 静态存储器 内存集成电路 |
| 文件： | 总14页 (文件大小：1230K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS1245Y/AB
1024k Nonvolatile SRAM
www.maxim-ic.com
FEATURES
PIN ASSIGNMENT
. 10 years minimum data retention in the
absence of external power
NC
A16
A14
A12
A7
1
32
31
VCC
A15
NC
WE
A13
A8
2
3
4
30
29
. Data is automatically protected during power
loss
. Replaces 128k x 8 volatile static RAM,
EEPROM or Flash memory
. Unlimited write cycles
. Low-power CMOS
5
6
28
27
A6
A5
A4
A9
7
8
26
25
A11
OE
A10
CE
A3
9
24
23
A2
10
A1
. Read and write access times as fast as 70 ns
. Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
. Full 10% VCC operating range (DS1245Y)
. Optional 5% VCC operating range
(DS1245AB)
. Optional industrial temperature range of
-40C to +85C, designated IND
. JEDEC standard 32-pin DIP package
. PowerCap Module (PCM) package
11
12
22
21
DQ7
DQ6
DQ5
DQ4
DQ3
A0
DQ0
DQ1
DQ2
GND
13
14
15
16
20
19
18
17
32-PIN ENCAPSULATED PACKAGE
740 MIL EXTENDED
NC
NC
A14
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
NC
A15
A16
A13
A12
A11
A10
A9
NC
-
-
Directly surface-mountable module
Replaceable snap-on PowerCap provides
lithium backup battery
VCC
WE
OE
CE
A8
DQ7
DQ6
DQ5
DQ4
DQ3
A7
A6
A5
A4
A3
A2
A1
A0
-
-
Standardized pinout for all nonvolatile
SRAM products
Detachment feature on PowerCap allows
easy removal using a regular screwdriver
GND VBAT
DQ2
DQ1
DQ0
GND
34-PIN POWERCAP MODULE (PCM)
(USES DS9034PC POWERCAP)
PIN DESCRIPTION
A0 - A16
DQ0 - DQ7
CE
- Address Inputs
- Data In/Data Out
- Chip Enable
- Write Enable
- Output Enable
- Power (+5V)
- Ground
WE
OE
VCC
GND
NC
- No Connect
1 of 13
121907
DS1245Y/AB
DESCRIPTION
The DS1245 1024k Nonvolatile SRAMs are1,048,576-bit, fully static, nonvolatile SRAMs organized as
131,072 words by 8 bits. Each complete NV SRAM has a self-contained lithium energy source and
control circuitry which constantly monitors VCC for an out-of-tolerance condition. When such a condition
occurs, the lithium energy source is automatically switched on and write protection is unconditionally
enabled to prevent data corruption. DIP-package DS1245 devices can be used in place of existing 128k x
8 static RAMs directly conforming to the popular bytewide 32-pin DIP standard. DS1245 devices in the
PowerCap Module package are directly surface mountable and are normally paired with a DS9034PC
PowerCap to form a complete Nonvolatile SRAM module. There is no limit on the number of write
cycles that can be executed and no additional support circuitry is required for microprocessor interfacing.
READ MODE
The DS1245 executes a read cycle whenever WE (Write Enable) is inactive (high) and CE (Chip Enable)
and OE (Output Enable) are active (low). The unique address specified by the 17 address inputs (A0 -
A16) defines which of the 131,072 bytes of data is to be accessed. Valid data will be available to the eight
data output drivers within tACC (Access Time) after the last address input signal is stable, providing that
CE and OE (Output Enable) access times are also satisfied. If OE and CE access times are not satisfied,
then data access must be measured from the later occurring signal (CE or OE ) and the limiting parameter
is either tCO for CE or tOE for OE rather than address access.
WRITE MODE
The DS1245 executes a write cycle whenever the WE and CE signals are active (low) after address
inputs are stable. The later occurring falling edge of CE or WE will determine the start of the write cycle.
The write cycle is terminated by the earlier rising edge of CE or WE . All address inputs must be kept
valid throughout the write cycle. WE must return to the high state for a minimum recovery time (tWR
)
before another cycle can be initiated. The OE control signal should be kept inactive (high) during write
cycles to avoid bus contention. However, if the output drivers are enabled (CE and OE active) then WE
will disable the outputs in tODW from its falling edge.
DATA RETENTION MODE
The DS1245AB provides full functional capability for VCC greater than 4.75 volts and write protects by
4.5 volts. The DS1245Y provides full functional capability for VCC greater than 4.5 volts and write-
protects by 4.25 volts. Data is maintained in the absence of VCC without any additional support circuitry.
The nonvolatile static RAMs constantly monitor VCC. Should the supply voltage decay, the NV SRAMs
automatically write-protect themselves, all inputs become “don’t care,” and all outputs become high
impedance. As VCC falls below approximately 3.0 volts, a power switching circuit connects the lithium
energy source to RAM to retain data. During power-up, when VCC rises above approximately 3.0 volts,
the power switching circuit connects external VCC to RAM and disconnects the lithium energy source.
Normal RAM operation can resume after VCC exceeds 4.75 volts for the DS1245AB and 4.5 volts for the
DS1245Y.
FRESHNESS SEAL
Each DS1245 device is shipped from Dallas Semiconductor with its lithium energy source disconnected,
guaranteeing full energy capacity. When VCC is first applied at a level greater than 4.25 volts, the lithium
energy source is enabled for battery back-up operation.
2 of 13
DS1245Y/AB
PACKAGES
The DS1245 devices are available in two packages: 32-pin DIP and 34-pin PowerCap Module (PCM).
The 32-pin DIP integrates a lithium battery, an SRAM memory and a nonvolatile control function into a
single package with a JEDEC-standard 600-mil DIP pinout. The 34-pin PowerCap Module integrates
SRAM memory and nonvolatile control along with contacts for connection to the lithium battery in the
DS9034PC PowerCap. The PowerCap Module package design allows a DS1245 PCM device to be
surface mounted without subjecting its lithium backup battery to destructive high-temperature reflow
soldering. After a DS1245 PCM is reflow soldered, a DS9034PC PowerCap is snapped on top of the
PCM to form a complete Nonvolatile SRAM module. The DS9034PC is keyed to prevent improper
attachment. DS1245 PowerCap Modules and DS9034PC PowerCaps are ordered separately and shipped
in separate containers. See the DS9034PC data sheet for further information.
ABSOLUTE MAXIMUM RATINGS*
Voltage on Any Pin Relative to Ground
Operating Temperature
Storage Temperature
-0.3V to +6.0V
0°C to 70°C, -40°C to +85°C for Ind parts
-40°C to +70°C, -40°C to +85°C for Ind parts
Soldering Temperature
DIP Module
+260°C for 10 seconds
Caution: Do Not Reflow
PowerCap Module
(Wave or Hand Solder Only)
See IPC/JEDEC J-STD-020
* This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
(tA: See Note 10)
PARAMETER
SYMBOL MIN
TYP
5.0
MAX
5.25
5.5
UNITS NOTES
DS1245AB Power Supply Voltage
DS1245Y Power Supply Voltage
Logic 1
VCC
VCC
VIH
VIL
4.75
4.5
V
V
V
V
5.0
2.2
0.0
VCC
0.8
Logic 0
DC ELECTRICAL
CHARACTERISTICS
PARAMETER
(VCC=5V 5% for DS1245AB)
(tA: See Note 10) (VCC=5V 10% for DS1245Y)
SYMBOL MIN
TYP
MAX
UNITS NOTES
Input Leakage Current
IIL
IIO
-1.0
-1.0
-1.0
2.0
+1.0
A
A
mA
mA
A
A
mA
V
+1.0
I/O Leakage Current CE VIH VCC
Output Current @ 2.4V
IOH
Output Current @ 0.4V
IOL
ICCS1
ICCS2
ICCO1
VTP
VTP
200
50
600
150
85
Standby Current CE =2.2V
Standby Current CE =VCC-0.5V
Operating Current
Write Protection Voltage (DS1245AB)
Write Protection Voltage (DS1245Y)
4.50
4.25
4.62
4.37
4.75
4.5
V
3 of 13
DS1245Y/AB
CAPACITANCE
PARAMETER
(tA=25C)
UNITS NOTES
SYMBOL MIN
TYP
MAX
10
Input Capacitance
CIN
5
5
pF
pF
Input/Output Capacitance
CI/O
10
AC ELECTRICAL
CHARACTERISTICS
(VCC=5V 5% for DS1245AB)
(tA: See Note 10) (VCC=5V 10% for DS1245Y)
DS1245AB-70
DS1245Y-70
DS1245AB-85
DS1245Y-85
PARAMETER
SYMBOL
tRC
UNITS NOTES
MIN MAX MIN MAX
Read Cycle Time
70
85
ns
ns
ns
ns
Access Time
tACC
tOE
70
35
70
85
45
85
OE to Output Valid
tCO
CE to Output Valid
tCOE
tOD
5
5
ns
ns
ns
ns
ns
ns
5
5
OE or CE to Output Active
Output High Z from Deselection
Output Hold from Address Change
Write Cycle Time
25
30
tOH
5
70
55
0
5
85
65
0
tWC
Write Pulse Width
tWP
3
Address Setup Time
Write Recovery Time
tAW
tWR1
tWR2
5
15
5
15
ns
ns
12
13
tODW
tOEW
tDS
25
30
ns
ns
ns
5
5
4
Output High Z from WE
Output Active from WE
Data Setup Time
5
5
30
35
Data Hold Time
tDH1
tDH2
0
10
0
10
ns
ns
12
13
4 of 13
DS1245Y/AB
(VCC=5V 5% for DS1245AB)
AC ELECTRICAL
CHARACTERISTICS
(tA: See Note 10) (VCC=5V 10% for DS1245Y)
DS1245AB-100 DS1245AB-120
DS1245Y-100
DS1245Y-120
PARAMETER
SYMBOL
tRC
UNITS NOTES
MIN MAX MIN MAX
100 120
Read Cycle Time
ns
ns
ns
ns
Access Time
tACC
tOE
100
50
120
60
OE to Output Valid
tCO
100
120
CE to Output Valid
tCOE
tOD
5
5
ns
ns
ns
ns
ns
ns
5
5
OE or CE to Output Active
Output High Z from Deselection
Output Hold from Address Change
Write Cycle Time
35
35
tOH
5
100
75
0
5
120
90
0
tWC
Write Pulse Width
tWP
3
Address Setup Time
Write Recovery Time
tAW
tWR1
tWR2
5
15
5
15
ns
ns
12
13
tODW
tOEW
tDS
35
35
ns
ns
ns
5
5
4
Output High Z from WE
Output Active from WE
Data Setup Time
5
5
40
50
Data Hold Time
tDH1
tDH2
0
10
0
10
ns
ns
12
13
5 of 13
DS1245Y/AB
READ CYCLE
SEE NOTE 1
WRITE CYCLE 1
SEE NOTES 2, 3, 4, 6, 7, 8, and 12
6 of 13
DS1245Y/AB
WRITE CYCLE 2
SEE NOTES 2, 3, 4, 6, 7, 8, and 13
POWER-DOWN/POWER-UP CONDITION
7 of 13
DS1245Y/AB
(tA: See Note 10)
UNITS NOTES
POWER-DOWN/POWER-UP TIMING
PARAMETER
SYMBOL MIN
tPD
tF
TYP
MAX
1.5
11
VCC Fail Detect to CE and WE Inactive
VCC slew from VTP to 0V
s
s
150
150
VCC slew from 0V to VTP
tR
s
tPU
tREC
2
ms
ms
VCC Valid to CE and WE Inactive
VCC Valid to End of Write Protection
125
(tA=25C)
UNITS NOTES
PARAMETER
SYMBOL MIN
tDR 10
TYP
MAX
Expected Data Retention Time
years
9
WARNING:
Under no circumstance are negative undershoots, of any amplitude, allowed when device is in battery
backup mode.
NOTES:
1. WE is high for a Read Cycle.
2. OE = VIH or VIL. If OE = VIH during write cycle, the output buffers remain in a high impedance state.
3. tWP is specified as the logical AND of CE and WE . tWP is measured from the latter of CE or WE
going low to the earlier of CE or WE going high.
4. tDH, tDS are measured from the earlier of CE or WE going high.
5. These parameters are sampled with a 5 pF load and are not 100% tested.
6. If the CE low transition occurs simultaneously with or latter than the WE low transition, the output
buffers remain in a high impedance state during this period.
7. If the CE high transition occurs prior to or simultaneously with the WE high transition, the output
buffers remain in high impedance state during this period.
8. If WE is low or the WE low transition occurs prior to or simultaneously with the CE low transition,
the output buffers remain in a high impedance state during this period.
9. Each DS1245 has a built-in switch that disconnects the lithium source until the user first applies VCC.
The expected tDR is defined as accumulative time in the absence of VCC starting from the time power
is first applied by the user. This parameter is assured by component selection, process control, and
design. It is not measured directly during production testing.
10. Each DS1245 has a built-in switch that disconnects the lithium source until VCC is first applied by the
user. The expected tDR is defined as accumulative time in the absence of VCC starting from the time
power is first applied by the user.
11. All AC and DC electrical characteristics are valid over the full operating temperature range. For
commercial products, this range is 0C to 70C. For industrial products (IND), this range is -40C to
+85C.
12. In a power-down condition the voltage on any pin may not exceed the voltage on VCC.
8 of 13
DS1245Y/AB
13. tWR1 and tDH1 are measured from WE going high.
14. tWR2 and tDH2 are measured from CE going high.
15. DS1245 modules are recognized by Underwriters Laboratory (U.L.) under file E99151.
DC TEST CONDITIONS
Outputs Open
Cycle = 200 ns for operating current
All voltages are referenced to ground
AC TEST CONDITIONS
Output Load: 100 pF + 1TTL Gate
Input Pulse Levels: 0 - 3.0V
Timing Measurement Reference Levels
Input: 1.5V
Output: 1.5V
Input pulse Rise and Fall Times: 5 ns
ORDERING INFORMATION
Supply
Tolerance
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 5%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
5V 10%
Part Number
Temperature Range
Pin/Package
Speed Grade
DS1245AB-70
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
32 / 740 EMOD
32 / 740 EMOD
34 / PowerCap*
34 / PowerCap*
32 / 740 EMOD
32 / 740 EMOD
34 / PowerCap*
34 / PowerCap*
32 / 740 EMOD
32 / 740 EMOD
32 / 740 EMOD
32 / 740 EMOD
34 / PowerCap*
34 / PowerCap*
32 / 740 EMOD
32 / 740 EMOD
32 / 740 EMOD
32 / 740 EMOD
32 / 740 EMOD
32 / 740 EMOD
34 / PowerCap*
34 / PowerCap*
32 / 740 EMOD
32 / 740 EMOD
34 / PowerCap*
34 / PowerCap*
32 / 740 EMOD
32 / 740 EMOD
32 / 740 EMOD
32 / 740 EMOD
34 / PowerCap*
34 / PowerCap*
32 / 740 EMOD
32 / 740 EMOD
32 / 740 EMOD
32 / 740 EMOD
70ns
70ns
70ns
70ns
70ns
70ns
70ns
70ns
85ns
DS1245AB-70+
DS1245ABP-70
DS1245ABP-70+
DS1245AB-70IND
DS1245AB-70IND+
DS1245ABP-70IND
DS1245ABP-70IND+
DS1245AB-85
DS1245AB-85+
DS1245AB-100
DS1245AB-100+
DS1245ABP-100
DS1245ABP-100+
DS1245AB-120
DS1245AB-120+
DS1245AB-120IND
DS1245AB-120IND+
DS1245Y-70
85ns
100ns
100ns
100ns
100ns
120ns
120ns
120ns
120ns
70ns
70ns
70ns
70ns
70ns
DS1245Y-70+
DS1245YP-70
DS1245YP-70+
DS1245Y-70IND
DS1245Y-70IND+
DS1245YP-70IND
DS1245YP-70IND+
DS1245Y-85
70ns
70ns
70ns
85ns
DS1245Y-85+
DS1245Y-100
85ns
100ns
100ns
100ns
100ns
120ns
120ns
120ns
120ns
DS1245Y-100+
DS1245YP-100
DS1245YP-100+
DS1245Y-120
DS1245Y-120+
DS1245Y-120IND
DS1245Y-120IND+
+ Denotes lead(Pb)-free/RoHS-compliant product.
* DS9034PC or DS9034PCI (PowerCap) required. Must be ordered separately.
9 of 13
DS1245Y/AB NONVOLATILE SRAM, 34-PIN POWERCAP MODULE
INCHES
NOM
0.925
0.985
-
PKG
DIM
MIN
0.920
0.980
-
MAX
0.930
0.990
0.080
0.058
0.052
0.025
0.030
A
B
C
D
E
F
0.052
0.048
0.015
0.020
0.055
0.050
0.020
0.025
G
10 of 13
121907
DS1245Y/AB
DS1245Y/AB NONVOLATILE SRAM, 34-PIN POWERCAP MODULE WITH
POWERCAP
INCHES
NOM
PKG
DIM
MIN
MAX
0.930
0.965
0.250
0.058
0.052
0.025
0.030
A
B
C
D
E
F
0.920
0.955
0.240
0.052
0.048
0.015
0.020
0.925
0.960
0.245
0.055
0.050
0.020
0.025
G
ASSEMBLY AND USE
Reflow soldering
Dallas Semiconductor recommends that PowerCap Module bases experience one pass through solder
reflow oriented label-side up (live-bug).
Hand soldering and touch-up
Do not touch soldering iron to leads for more than 3 seconds. To solder, apply flux to the pad, heat the
lead frame pad and apply solder. To remove part, apply flux, heat pad until solder reflows, and use a
solder wick.
LPM replacement in a socket
To replace a Low Profile Module in a 68-pin PLCC socket, attach a DS9034PC PowerCap to a module
base then insert the complete module into the socket one row of leads at a time, pushing only on the
corners of the cap. Never apply force to the center of the device. To remove from a socket, use a PLCC
extraction tool and ensure that it does not hit or damage any of the module IC components. Do not use
any other tool for extraction.
11 of 13
DS1245Y/AB
RECOMMENDED POWERCAP MODULE LAND PATTERN
INCHES
NOM
PKG
DIM
MIN
MAX
A
B
C
D
E
-
-
-
-
-
1.050
0.826
0.050
0.030
0.112
-
-
-
-
-
RECOMMENDED POWERCAP MODULE SOLDER STENCIL
INCHES
PKG
DIM
MIN
NOM
1.050
0.890
0.050
0.030
0.080
MAX
A
B
C
D
E
-
-
-
-
-
-
-
-
-
-
PACKAGE INFORMATION
For the latest package outline information and land patterns, go to http://www.maxim-ic.com/packages.
PACKAGE TYPE
32 MOD
PACKAGE CODE
MDT32-6
DOCUMENT NO.
21-0245
34 PWRCP
PC2+3
21-0246
12 of 13
DS1245Y/AB
REVISION HISTORY
REVISION
DESCRIPTION
PAGES CHANGED
DATE
Added package information table.
121907
10, 11, 12
Removed the DIP module package drawing and
dimension table.
13 of 13
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