ETC DS1230Y/AB

DS1230Y/AB
256k Nonvolatile SRAM
www.maxim-ic.com
FEATURES
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PIN ASSIGNMENT
10 years minimum data retention in the
absence of external power
Data is automatically protected during power
loss
Replaces 32k x 8 volatile static RAM,
EEPROM or Flash memory
Unlimited write cycles
Low-power CMOS
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 (DS1230Y)
Optional ±5% VCC operating range
(DS1230AB)
Optional industrial temperature range of
-40°C to +85°C, designated IND
JEDEC standard 28-pin DIP package
PowerCap Module (PCM) package
- Directly surface-mountable module
- Replaceable snap-on PowerCap provides
lithium backup battery
- Standardized pinout for all nonvolatile
SRAM products
- Detachment feature on PowerCap allows
easy removal using a regular screwdriver
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
3
4
5
6
7
8
9
10
11
12
28
27
26
25
24
23
22
21
20
19
18
17
13
16
14
15
VCC
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
28-Pin ENCAPSULATED PACKAGE
740-mil EXTENDED
NC
NC
NC
NC
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
16
17
GND VBAT
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-Pin POWERCAP MODULE (PCM)
(USES DS9034PC POWERCAP)
PIN DESCRIPTION
A0 - A14
DQ0 - DQ7
CE
WE
OE
VCC
GND
NC
1 of 12
- Address Inputs
- Data In/Data Out
- Chip Enable
- Write Enable
- Output Enable
- Power (+5V)
- Ground
- No Connect
103002
DS1230Y/AB
DESCRIPTION
The DS1230 256k Nonvolatile SRAMs are 262,144-bit, fully static, nonvolatile SRAMs organized as
32,768 words by 8 bits. Each 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 DS1230 devices can be used in place of existing 32k x 8 static
RAMs directly conforming to the popular bytewide 28-pin DIP standard. The DIP devices also match the
pinout of 28256 EEPROMs, allowing direct substitution while enhancing performance. DS1230 devices
in the Low Profile Module package are specifically designed for surface-mount applications. 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 DS1230 devices execute 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 15 address inputs
(A0 - A14) defines which of the 32,768 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 DS1230 devices execute 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 DS1230AB provides full functional capability for VCC greater than 4.75 volts and write protects by
4.5 volts. The DS1230Y 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 highimpedance. 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 DS1230AB and 4.5 volts for the
DS1230Y.
FRESHNESS SEAL
Each DS1230 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 12
DS1230Y/AB
PACKAGES
The DS1230 devices are available in two packages: 28-pin DIP and 34-pin PowerCap Module (PCM).
The 28-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 DS1230 PCM device to be
surface mounted without subjecting its lithium backup battery to destructive high-temperature reflow
soldering. After a DS1230 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. DS1230 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
Soldering Temperature
*
-0.3V to +7.0V
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
260°C for 10 seconds
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
PARAMETER
DS1230AB Power Supply Voltage
(tA: See Note 10)
SYMBOL
VCC
MIN
4.75
TYP
5.0
MAX
5.25
UNITS
V
DS1230Y Power Supply Voltage
VCC
4.5
5.0
5.5
V
Logic 1
VIH
2.2
VCC
V
Logic 0
VIL
0.0
0.8
V
DC ELECTRICAL
CHARACTERISTICS
PARAMETER
NOTES
(VCC=5V ± 5% for DS1230AB)
(tA: See Note 10) (VCC=5V ± 10% for DS1230Y)
SYMBOL
MIN
Input Leakage Current
IIL
I/O Leakage Current CE ³ VIH £ VCC
TYP
MAX
UNITS
-1.0
+1.0
mA
IIO
-1.0
+1.0
mA
Output Current @ 2.4V
IOH
-1.0
mA
Output Current @ 0.4V
IOL
2.0
mA
Standby Current CE =2.2V
ICCS1
200
600
mA
Standby Current CE =VCC-0.5V
ICCS2
50
150
mA
Operating Current
ICCO1
85
mA
Write Protection Voltage (DS1230AB)
VTP
4.50
4.62
4.75
V
Write Protection Voltage (DS1230Y)
VTP
4.25
4.37
4.5
V
3 of 12
NOTES
DS1230Y/AB
CAPACITANCE
(tA=25°C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Input Capacitance
CIN
5
10
pF
Input/Output Capacitance
CI/O
5
10
pF
NOTES
(VCC=5V ± 5% for DS1230AB)
(tA: See Note 10) (VCC=5V ± 10% for DS1230Y)
AC ELECTRICAL
CHARACTERISTICS
DS1230AB-70 DS1230AB-85
DS1230Y-85
PARAMETER SYMBOL DS1230Y-70
MIN MAX MIN MAX
tRC
70
85
Read Cycle
Time
DS1230AB-100
DS1230Y-100
MIN
100
UNITS
NOTES
MAX
ns
Access Time
tACC
70
85
100
ns
OE
to Output
Valid
tOE
35
45
50
ns
CE
to Output
Valid
tCO
70
85
100
ns
OE or CE to
Output Active
tCOE
Output High Z
from
Deselection
tOD
Output Hold
from Address
Change
tOH
5
5
5
ns
Write Cycle
Time
tWC
70
85
100
ns
Write Pulse
Width
tWP
55
65
75
ns
Address Setup
Time
tAW
0
0
0
ns
Write Recovery
Time
tWR1
tWR2
5
15
5
15
5
15
ns
12
13
Output High Z
from WE
tODW
ns
5
Output Active
from WE
tOEW
5
5
5
ns
5
Data Setup
Time
tDS
30
35
40
ns
4
Data Hold
Time
tDH1
tDH2
0
10
0
10
0
10
ns
12
13
5
5
25
5
30
25
35
30
4 of 12
35
ns
5
ns
5
3
DS1230Y/AB
AC ELECTRICAL CHARACTERISTICS (cont'd)
PARAMETER
SYMBOL
DS1230AB-120
DS1230Y-120
DS1230AB-150
DS1230Y-150
DS1230AB-200
DS1230Y-200
MIN
MIN
MIN
MAX
120
MAX
150
UNITS
NOTES
MAX
Read Cycle
Time
tRC
Access Time
tACC
120
150
200
ns
OE
to Output
Valid
tOE
60
70
100
ns
CE to Output
Valid
tCO
120
150
200
ns
OE
or CE to
Output Active
tCOE
Output High Z
from
Deselection
tOD
Output Hold
from Address
Change
tOH
5
5
5
ns
Write Cycle
Time
tWC
120
150
200
ns
Write Pulse
Width
tWP
90
100
100
ns
Address Setup
Time
tAW
0
0
0
ns
Write Recovery
Time
tWR1
tWR2
5
15
5
15
5
15
ns
12
13
Output High Z
from WE
tODW
ns
5
Output Active
from WE
tOEW
5
5
5
ns
5
Data Setup
Time
tDS
50
60
80
ns
4
Data Hold Time
tDH1
tDH2
0
10
0
10
0
10
ns
12
13
5
200
5
35
5
35
35
35
35
5 of 12
ns
35
ns
5
ns
5
3
DS1230Y/AB
READ CYCLE
SEE NOTE 1
WRITE CYCLE 1
SEE NOTES 2, 3, 4, 6, 7, 8, and 12
6 of 12
DS1230Y/AB
WRITE CYCLE 2
SEE NOTES 2, 3, 4, 6, 7, 8, and 13
POWER-DOWN/POWER-UP CONDITION
SEE NOTE 11
7 of 12
DS1230Y/AB
POWER-DOWN/POWER-UP TIMING
PARAMETER
(tA: See Note 10)
SYMBOL
tPD
MIN
VCC slew from VTP to 0V
tF
150
ms
VCC slew from 0V to VTP
tR
150
ms
VCC Valid to CE and WE Inactive
tPU
2
ms
VCC Valid to End of Write Protection
tREC
125
ms
VCC Fail Detect to CE and WE Inactive
TYP
MAX
1.5
UNITS
ms
NOTES
11
(tA=25°C)
PARAMETER
Expected Data Retention Time
SYMBOL
tDR
MIN
10
TYP
MAX
UNITS
years
NOTES
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 DS1230 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.
10. All AC and DC electrical characteristics are valid over the full operating temperature range. For
commercial products, this range is 0°C to 70°C. For industrial products (IND), this range is -40°C to
+85°C.
11. In a power-down condition the voltage on any pin may not exceed the voltage on VCC.
12. tWR1 and tDH1 are measured from WE going high.
13. tWR2 and tDH2 are measured from CE going high.
14. DS1230 modules are recognized by Underwriters Laboratory (U.L.Ò) under file E99151.
8 of 12
DS1230Y/AB
DC TEST CONDITIONS
AC TEST CONDITIONS
Outputs Open
Cycle = 200 ns for operating current
All voltages are referenced to ground
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
DS1230 TTP - SSS - III
Operating Temperature Range
blank: 0° to 70°
IND: -40° to +85°C
Access Speed
70:
70 ns
85:
85 ns
100: 100 ns
120: 120 ns
150: 150 ns
200: 200 ns
Package Type
blank: 28-pin 600-mil DIP
P:
34-pin PowerCap Module
VCC Tolerance
AB: ±5%
Y:
±10%
DS1230Y/AB NONVOLATILE SRAM, 28-PIN 740-MIL EXTENDED DIP
MODULE
PKG
9 of 12
28-PIN
DIM
MIN
MAX
A IN.
MM
1.480
37.60
1.500
38.10
B IN.
MM
0.720
18.29
0.740
18.80
C IN.
MM
0.355
9.02
0.375
9.52
D IN.
MM
0.080
2.03
0.110
2.79
E IN.
MM
0.015
0.38
0.025
0.63
F IN.
MM
0.120
3.05
0.160
4.06
G IN.
MM
0.090
2.29
0.110
2.79
H IN.
MM
0.590
14.99
0.630
16.00
J IN.
MM
0.008
0.20
0.012
0.30
K IN.
MM
0.015
0.38
0.021
0.53
DS1230Y/AB
DS1230Y/AB NONVOLATILE SRAM, 34-PIN POWERCAP MODULE
10 of 12
INCHES
PKG
DIM
MIN
NOM
MAX
A
0.920
0.925
0.930
B
0.980
0.985
0.990
C
-
-
0.080
D
0.052
0.055
0.058
E
0.048
0.050
0.052
F
0.015
0.020
0.025
G
0.020
0.025
0.030
DS1230Y/AB
DS1230Y/AB NONVOLATILE SRAM, 34-PIN POWERCAP MODULE WITH
POWERCAP
INCHES
PKG
DIM
MIN
NOM
MAX
A
0.920
0.925
0.930
B
0.955
0.960
0.965
C
0.240
0.245
0.250
D
0.052
0.055
0.058
E
0.048
0.050
0.052
F
0.015
0.020
0.025
G
0.020
0.025
0.030
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 12
DS1230Y/AB
RECOMMENDED POWERCAP MODULE LAND PATTERN
PKG
DIM
INCHES
MIN
NOM
MAX
A
-
1.050
-
B
-
0.826
-
C
-
0.050
-
D
-
0.030
-
E
-
0.112
-
RECOMMENDED POWERCAP MODULE SOLDER STENCIL
12 of 12
INCHES
PKG
DIM
MIN
NOM
MAX
A
-
1.050
-
B
-
0.890
-
C
-
0.050
-
D
-
0.030
-
E
-
0.080
-