ADVANCE
CY14E108L, CY14E108N
8 Mbit (1024K x 8/512K x 16) nvSRAM
Features
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Functional Description
The Cypress CY14E108L/CY14E108N is a fast static RAM, with
a nonvolatile element in each memory cell. The memory is
organized as 1024K words of 8 bits each or 512K words of 16
bits each. The embedded nonvolatile elements incorporate
QuantumTrap technology, producing the world’s most reliable
nonvolatile memory. The SRAM provides infinite read and write
cycles, while independent nonvolatile data resides in the highly
reliable QuantumTrap cell. Data transfers from the SRAM to the
nonvolatile elements (the STORE operation) takes place
automatically at power down. On power up, data is restored to
the SRAM (the RECALL operation) from the nonvolatile memory.
Both the STORE and RECALL operations are also available
under software control.
20 ns, 25 ns, and 45 ns access times
Internally organized as 1024K x 8 (CY14E108L) or 512K x 16
(CY14E108N)
Hands off automatic STORE on power down with only a small
capacitor
STORE to QuantumTrap
®
nonvolatile elements initiated by
software, device pin, or AutoStore
®
on power down
RECALL to SRAM initiated by software or power up
Infinite read, write, and recall cycles
200,000 STORE cycles to QuantumTrap
20 year data retention
Single 5V +10% operation
Commercial and industrial temperatures
48-pin FBGA, 44 and 54-pin TSOP II packages
Pb-free and RoHS compliance
Logic Block Diagram
V
CC
V
CAP
Address A
0
- A
19
CE
OE
WE
[1]
[1]
DQ0 - DQ7
CY14E108L
CY14E108N
HSB
BHE
BLE
V
SS
Note
1. Address A
0
- A
19
and Data DQ0 - DQ7 for x8 configuration, Address A
0
- A
18
and Data DQ0 - DQ15 for x16 configuration.
Cypress Semiconductor Corporation
Document Number: 001-45524 Rev. *A
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Revised June 24, 2008
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ADVANCE
CY14E108L, CY14E108N
Pinouts
Figure 1. Pin Diagram - 48 FBGA
(x8)
Top View
(not to scale)
1
NC
NC
DQ0
V
SS
V
CC
DQ3
2
OE
NC
NC
DQ1
3
A
0
A
3
A
5
A
17
4
A
1
A
4
A
6
A
7
A
16
A
15
A
13
A
10
5
A
2
CE
NC
DQ5
DQ6
NC
WE
A
11
6
NC
NC
DQ4
V
CC
V
SS
DQ7
NC
A
19
A
B
C
D
E
F
G
H
48-FBGA
(x16)
Top View
(not to scale)
1
BLE
2
OE
3
A
0
A
3
A
5
4
A
1
A
4
A
6
A
7
A
16
A
15
A
13
A
10
5
A
2
CE
6
NC
DQ0
A
B
C
D
E
F
G
H
48-FBGA
DQ8 BHE
DQ9 DQ10
V
SS
DQ1 DQ2
DQ3
DQ4
V
CC
V
SS
DQ11 A
17
DQ2 V
CAP
NC
A
14
A
12
A
9
V
CC
DQ12 V
CAP
DQ14 DQ13
DQ15 HSB
A
18
A
14
A
12
A
9
DQ5 DQ6
WE
A
11
DQ7
[2]
NC
[2]
HSB
NC
A
18
A
8
A
8
Figure 2. Pin Diagram - 44/54 TSOP II
NC
[2]
NC
A
0
A
1
A
2
A
3
A
4
CE
DQ0
DQ1
V
CC
V
SS
DQ2
DQ3
WE
A
5
A
6
A
7
A
8
A
9
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
HSB
NC
A
19
A
18
A
17
A
16
A
15
OE
DQ7
DQ6
V
SS
V
CC
DQ5
DQ4
V
CAP
A
14
A
13
A
12
A
11
A
10
NC
NC
NC
[2]
NC
A
0
A
1
A
2
A
3
A
4
CE
DQ0
DQ1
DQ2
DQ3
V
CC
V
SS
DQ4
DQ5
DQ6
DQ7
WE
A
5
A
6
A
7
A
8
A
9
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
HSB
A
18
A
17
A
16
A
15
OE
BHE
BLE
DQ15
DQ14
DQ13
DQ12
V
SS
V
CC
DQ11
DQ10
DQ9
DQ8
V
CAP
A
14
A
13
A
12
A
11
A
10
NC
NC
NC
44 - TSOP II
(x8)
54 - TSOP II
(x16)
Top View
(not to scale)
Top View
(
not to scale)
Note
2. Address expansion for 16 Mbit. NC pin not connected to die.
Document Number: 001-45524 Rev. *A
Page 2 of 20
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ADVANCE
CY14E108L, CY14E108N
Pin Definitions
Pin Name
A
0
– A
19
A
0
– A
18
DQ0 – DQ7
DQ0 – DQ15
IO Type
Input
Description
Address Inputs Used to Select One of the 1,048,576 bytes of the nvSRAM for x8 Configuration.
Address Inputs Used to Select One of the 524, 288 bytes of the nvSRAM for x16 Configuration.
Input/Output
Bidirectional Data IO Lines for x8 Configuration.
Used as input or output lines depending on
operation.
Bidirectional Data IO Lines for x16 Configuration.
Used as input or output lines depending on
operation.
Input
Input
Input
Input
Input
Ground
Write Enable Input, Active LOW.
When selected LOW, data on the IO pins is written to the address
location latched by the falling edge of CE.
Chip Enable Input, Active LOW.
When LOW, selects the chip. When HIGH, deselects the chip.
Output Enable, Active LOW.
The active LOW OE input enables the data output buffers during read
cycles. IO pins are tri-stated on deasserting OE high.
Byte High Enable, Active LOW.
Controls DQ15 - DQ8.
Byte Low Enable, Active LOW.
Controls DQ7 - DQ0.
Ground for the Device.
Must be connected to the ground of the system.
WE
CE
OE
BHE
BLE
V
SS
V
CC
HSB
Power Supply
Power Supply Inputs to the Device.
Input/Output
Hardware Store Busy (HSB).
When LOW this output indicates that a hardware store is in progress.
When pulled LOW external to the chip it initiates a nonvolatile STORE operation. A weak internal pull
up resistor keeps this pin HIGH if not connected (connection optional).
Power Supply
AutoStore Capacitor.
Supplies power to the nvSRAM during power loss to store data from the SRAM
to nonvolatile elements.
No Connect
No Connect.
Do not connect this pin to the die.
V
CAP
NC
Document Number: 001-45524 Rev. *A
Page 3 of 20
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ADVANCE
CY14E108L, CY14E108N
Device Operation
The CY14E108L/CY14E108N nvSRAM is made up of two
functional components paired in the same physical cell. They are
an SRAM memory cell and a nonvolatile QuantumTrap cell. The
SRAM memory cell operates as a standard fast static RAM. Data
in the SRAM is transferred to the nonvolatile cell (the STORE
operation), or from the nonvolatile cell to the SRAM (the RECALL
operation). Using this unique architecture all cells are stored and
recalled in parallel. During the STORE and RECALL operations
SRAM read and write operations are inhibited. The
CY14E108L/CY14E108N supports infinite reads and writes
similar to a typical SRAM. In addition, it provides infinite RECALL
operations from the nonvolatile cells and up to 200K STORE
operations.
To reduce unnecessary nonvolatile stores, AutoStore and
Hardware Store operations are ignored unless at least one
WRITE operation has taken place since the most recent STORE
or RECALL cycle. Software initiated STORE cycles are
performed regardless of whether a WRITE operation has taken
place. Monitor the HSB signal by the system to detect if an
AutoStore cycle is in progress.
Figure 3. AutoStore Mode
Vcc
0.1uF
10kOhm
Vcc
SRAM Read
The CY14E108L/CY14E108N performs a READ cycle when CE
and OE are LOW and WE and HSB are HIGH. The address
specified on pins A
0-19
or A
0-18
determines which of the
1,048,576 data bytes or 524,288 words of 16 bits each is
accessed. When the read is initiated by an address transition,
the outputs are valid after a delay of t
AA
. If the read is initiated by
CE or OE, the outputs are valid at t
ACE
or at t
DOE
, whichever is
later. The data outputs repeatedly respond to address changes
within the t
AA
access time without the need for transitions on any
control input pins. This remains valid until another address
change or until CE or OE is brought HIGH, or WE or HSB is
brought LOW.
WE
V
CAP
V
SS
V
CAP
Hardware STORE Operation
The CY14B108L/CY14B108N provides the HSB pin to control
and acknowledge the STORE operations. Use the HSB pin to
request a hardware STORE cycle. When the HSB pin is driven
LOW, the CY14B108L/CY14B108N conditionally initiates a
STORE operation after t
DELAY
. An actual STORE cycle only
begins if a WRITE to the SRAM took place since the last STORE
or RECALL cycle. The HSB pin also acts as an open drain driver
that is internally driven LOW to indicate a busy condition while
the STORE (initiated by any means) is in progress.
SRAM READ and WRITE operations that are in progress when
HSB is driven LOW by any means are given time to complete
before the STORE operation is initiated. After HSB goes LOW,
the CY14B108L/CY14B108N continues SRAM operations for
t
DELAY
. During t
DELAY
, multiple SRAM READ operations may take
place. If a WRITE is in progress when HSB is pulled low it is
allowed a time, t
DELAY
to complete. However, any SRAM WRITE
cycles requested after HSB goes LOW is inhibited until HSB
returns HIGH.
During any STORE operation, regardless of how it was initiated,
the CY14B108L/CY14B108N continues to drive the HSB pin
LOW, releasing it only when the STORE is complete.Upon
completion
of
the
STORE
operation,
the
CY14B108L/CY14B108N remains disabled until the HSB pin
returns HIGH. Leave the HSB unconnected if it is not used.
SRAM Write
A WRITE cycle is performed when CE and WE are LOW and
HSB is HIGH. The address inputs must be stable before entering
the WRITE cycle and must remain stable until either CE or WE
goes high at the end of the cycle. The data on the common IO
pins DQ
0–15
are written into the memory if the data is valid t
SD
before the end of a WE controlled WRITE or before the end of a
CE controlled WRITE. It is recommended that OE be kept HIGH
during the entire WRITE cycle to avoid data bus contention on
common IO lines. If OE is left LOW, internal circuitry turns off the
output buffers t
HZWE
after WE goes LOW.
AutoStore Operation
The CY14B108L/CY14B108N stores data to the nvSRAM using
one of the following three storage operations: Hardware Store
activated by HSB; Software Store activated by an address
sequence; AutoStore on device power down. The AutoStore
operation is a unique feature of QuantumTrap technology and is
enabled by default on the CY14B108L/CY14B108N.
During a normal operation, the device draws current from V
CC
to
charge a capacitor connected to the V
CAP
pin. This stored
charge is used by the chip to perform a single STORE operation.
If the voltage on the V
CC
pin drops below V
SWITCH
, the part
automatically disconnects the V
CAP
pin from V
CC
. A STORE
operation is initiated with power provided by the V
CAP
capacitor.
Figure 3
shows the proper connection of the storage capacitor
(V
CAP
) for automatic store operation. Refer to the section
DC
Electrical Characteristics
on page 7 for the size of V
CAP
.
Hardware RECALL (Power Up)
During power up or after any low power condition
(V
CC
< V
SWITCH
), an internal RECALL request is latched. When
V
CC
again exceeds the sense voltage of V
SWITCH
, a RECALL
cycle is automatically initiated and takes t
HRECALL
to complete.
Document Number: 001-45524 Rev. *A
Page 4 of 20
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ADVANCE
CY14E108L, CY14E108N
Software STORE
Transfer data from the SRAM to the nonvolatile memory with a
software address sequence. The CY14B108L/CY14B108N
software STORE cycle is initiated by executing sequential CE
controlled READ cycles from six specific address locations in
exact order. During the STORE cycle an erase of the previous
nonvolatile data is first performed, followed by a program of the
nonvolatile elements. After a STORE cycle is initiated, further
input and output are disabled until the cycle is completed.
Because a sequence of READs from specific addresses is used
for STORE initiation, it is important that no other READ or WRITE
accesses intervene in the sequence. If there are intervening
READ or WRITE accesses, the sequence is aborted and no
STORE or RECALL takes place.
To initiate the software STORE cycle, the following READ
sequence must be performed.
1. Read Address 0x4E38 Valid READ
2. Read Address 0xB1C7 Valid READ
3. Read Address 0x83E0 Valid READ
4. Read Address 0x7C1F Valid READ
5. Read Address 0x703F Valid READ
6. Read Address 0x8FC0 Initiate STORE Cycle
The software sequence may be clocked with CE controlled
READs or OE controlled READs. After the sixth address in the
sequence is entered, the STORE cycle commences and the chip
Table 1. Mode Selection
CE
H
L
L
L
WE
X
H
L
H
OE
X
L
X
L
is disabled. It is important to use READ cycles and not WRITE
cycles in the sequence, although it is not necessary that OE be
LOW for a valid sequence. After the t
STORE
cycle time is fulfilled,
the SRAM is activated again for the READ and WRITE operation.
Software RECALL
Transfer the data from the nonvolatile memory to the SRAM with
a software address sequence. A software RECALL cycle is
initiated with a sequence of READ operations in a manner similar
to the software STORE initiation. To initiate the RECALL cycle,
the following sequence of CE controlled READ operations must
be performed.
1. Read Address 0x4E38 Valid READ
2. Read Address 0xB1C7 Valid READ
3. Read Address 0x83E0 Valid READ
4. Read Address 0x7C1F Valid READ
5. Read Address 0x703F Valid READ
6. Read Address 0x4C63 Initiate RECALL Cycle
Internally, RECALL is a two step procedure. First, the SRAM data
is cleared and then the nonvolatile information is transferred into
the SRAM cells. After the t
RECALL
cycle time, the SRAM is again
ready for READ and WRITE operations. The RECALL operation
does not alter the data in the nonvolatile elements.
A15 - A0
X
X
X
0x4E38
0xB1C7
0x83E0
0x7C1F
0x703F
0x8B45
0x4E38
0xB1C7
0x83E0
0x7C1F
0x703F
0x4B46
Mode
Not Selected
Read SRAM
Write SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
AutoStore
Disable
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
AutoStore Enable
IO
Output High Z
Output Data
Input Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Power
Standby
Active
Active
Active
[3,4,5]
L
H
L
Active
[3,4,5]
Notes
3. The six consecutive address locations must be in the order listed. WE must be HIGH during all six cycles to enable a nonvolatile cycle.
4. While there are 20/19 address lines on the CY14B108L/CY14B108N, only the lower 16 lines are used to control software modes.
5. IO state depends on the state of OE, BHE, and BLE. The IO table shown assumes OE, BHE, and BLE LOW.
Document Number: 001-45524 Rev. *A
Page 5 of 20
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