ON N01S818HA 1 mb ultra-low power serial sram Datasheet

N01S818HA
1 Mb Ultra-Low Power
Serial SRAM
Standard SPI Interface and Multiplex
DUAL and QUAD Interface
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Overview
The ON Semiconductor serial SRAM family includes several
integrated memory devices including this 1 Mb serially accessed
Static Random Access Memory, internally organized as 128 K words
by 8 bits. The devices are designed and fabricated using
ON Semiconductor’s advanced CMOS technology to provide both
high-speed performance and low power. The devices operate with a
single chip select (CS) input and use a simple Serial Peripheral
Interface (SPI) protocol. In SPI mode, a single data-in (SI) and
data-out (SO) line is used along with the clock (SCK) to access data
within the device. In DUAL mode, two multiplexed data-in/data-out
(SIO0-SIO1) lines are used and in QUAD mode, four multiplexed
data-in/data-out (SIO0-SIO3) lines are used with the clock to access
the memory.
The devices can operate over a wide temperature range of −40°C to
+85°C and are available in a 8-lead TSSOP package.
Features
•
•
•
•
•
•
•
•
•
Power Supply Range: 1.7 to 2.2 V
Very Low Typical Standby Current < 1 mA
Very Low Operating Current < 10 mA
Simple Serial Interface
♦ Single-bit SPI Access
♦ DUAL-bit and QUAD-bit SPI-like Access
Flexible Operating Modes
♦ Word Mode
♦ Page Mode
♦ Burst Mode (Full Array)
High Frequency Read and Write Operation
♦ Clock Frequency 20 MHz
Built-in Write Protection (CS High)
High Reliability
♦ Unlimited Write Cycles
These Devices are Pb−Free and are RoHS Compliant
♦ Green TSSOP
TSSOP8 3x4.4
CASE 948BH
PACKAGE CONFIGURATION
CS
1
8
VCC
SO / SIO1
2
7
HOLD / SIO3
NC / SIO2
3
6
SCK
VSS
4
5
SI / SIO0
ORDERING INFORMATION
Device
Package
Shipping†
N01S818HAT22I
TSSOP−8
(Pb−Free)
100 Units / Tube
N01S818HAT22IT TSSOP−8
(Pb−Free)
3000 / Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Table 1. DEVICE OPTIONS
Device / Part Number
N01S818HAT22I
© Semiconductor Components Industries, LLC, 2013
September, 2013 − Rev. 0
Power Supply
Speed
Package
Function
1.7 V − 2.2 V
20 MHz
TSSOP−8
HOLD
1
Publication Order Number:
N01S818HA/D
N01S818HA
Table 2. PIN NAMES
Pin Name
Pin Function
CS
Chip Select
SCK
Serial Clock
SI / SIO0
Data Input − SPI mode
Data Input/Output 0 − DUAL and QUAD mode
SO / SIO1
Data Output − SPI mode
Data Input/Output 1 − DUAL and QUAD mode
SC / SIO2
No Connect − SPI and DUAL mode
Data Input/Output 2 − QUAD mode
HOLD / SIO3
HOLD Input − SPI and DUAL mode
Data Input/Output 3 − QUAD mode
VCC
Power
VSS
Ground
Decode
Logic
SCK
CS
SI / SIO0
Interface
Circuitry
Control
Logic
SRAM
Array
SO / SIO1
Data Flow
Circuitry
SIO2
HOLD / SIO3
Figure 1. Functional Block Diagram
Table 3. CONTROL SIGNAL DESCRIPTIONS
Signal
Mode
Used
Name
Description
CS
All
Chip Select
A low level selects the device and a high level puts the device in standby mode. If CS is brought
high during a program cycle, the cycle will complete and then the device will enter standby mode.
When CS is high, SO is in high-Z. CS must be driven low after power-up prior to any sequence
being started.
SCK
All
Serial Clock
Synchronizes all activities between the memory and controller. All incoming addresses, data and
instructions are latched on the rising edge of SCK. Data out is updated after the falling edge of
SCK.
SI
SPI
Serial Data In
SO
SPI
Serial Data Out
HOLD
SPI and
DUAL
Hold
SIO0 - 1
DUAL
Serial Data
Input / Output
Receives instructions, addresses and data on the rising edge of SCK. Data is transferred out
after the falling edge of SCK. The instruction must be set after power-up to enable the DUAL
access mode.
SIO0 - 3
QUAD
Serial Data
Input / Output
Receives instructions, addresses and data on the rising edge of SCK. Data is transferred out
after the falling edge of SCK. The instruction must be set after power-up to enable the QUAD
access mode.
Receives instructions, addresses and data on the rising edge of SCK.
Data is transferred out after the falling edge of SCK.
A high level is required for normal operation. Once the device is selected and a serial sequence
is started, this input may be taken low to pause serial communication without resetting the serial
sequence. The pin must be brought low while SCK is low for immediate use. If SCK is not low,
the HOLD function will not be invoked until the next SCK high to low transition. The device must
remain selected during this sequence. SO is high-Z during the Hold time and SI and SCK are
inputs are ignored. To resume operations, HOLD must be pulled high while the SCK pin is low.
Lowering the HOLD input at any time will take to SO output to High-Z.
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N01S818HA
Basic Operation
By programming the device through a command
instruction, the dual and quad access modes may be initiated.
In these modes, multiplexed I/O lines take the place of the
SPI SI and SO pins and along with the CS and SCK control
the device in a SPI-like, two bit (DUAL) and four bit
(QUAD) wide serial manner. Once the device is put into
either the DUAL or QUAD mode, the device will remain
operating in that mode until powered down or the Reset
Mode operation is programmed.
The following table contains the possible instructions and
formats. All instructions, addresses and data are transferred
MSB first and LSB last.
The 1 Mb serial SRAM is designed to interface directly
with a standard Serial Peripheral Interface (SPI) common on
many standard micro-controllers in the default state. It may
also interface with other non-SPI ports by programming
discrete I/O lines to operate the device.
The serial SRAM contains an 8-bit instruction register and
is accessed via the SI pin. The CS pin must be low and the
HOLD pin must be high for the entire operation. Data is
sampled on the first rising edge of SCK after CS goes low.
If the clock line is shared, the user can assert the HOLD input
and place the device into a Hold mode. After releasing the
HOLD pin, the operation will resume from the point where
it was held. The Hold operation is only supported in SPI and
DUAL modes.
Table 4. INSTRUCTION SET
Instruction
Command
READ
03h
Read data from memory starting at selected address
Description
WRITE
02h
Write (program) data to memory starting at selected address
EQIO
38h
Enable QUAD I/O access
EDIO
3Bh
Enable DUAL I/O access
RSTQIO
FFh
Reset from QUAD and DUAL to SPI I/O access
RDMR
05h
Read mode register
WRMR
01h
Write mode register
DEVICE OPERATIONS
Read Operation
By continuing to provide clock cycles to the device, data
can continue to be read out of the memory array in
sequentially. The internal address pointer is automatically
incremented to the next higher address after each byte of
data is read out until the highest memory address is reached.
When the highest memory address is reached, 1FFFFh, the
address pointer wraps to the address 00000h. This allows the
read cycles to be continued indefinitely. All Read operations
are terminated by pulling CS high.
The serial SRAM Read operation is started by by enabling
CS low. First, the 8-bit Read instruction is transmitted to the
device through the SI (or SIO0-3) pin(s) followed by the
24-bit address with the 7 MSBs of the address being “don’t
care” bits and ignored. In SPI mode, after the READ
instruction and address bits are sent, the data stored at that
address in memory is shifted out on the SO pin after the
output valid time. Additional “dummy” clock cycles (four in
DUAL and two in QUAD) are required to follow the
instruction and address inputs prior to the data being driven
out on the SIO0-3 pins while operating in these two modes.
CS
SCK
0
1
2
3
4
5
6
7
8
9
Instruction
SI
0
0
0
0
0
10
11
29
30
31
1
0
32
33
34
7
6
5
35
36
37
38
39
2
1
0
24−bit address
0
1
1
23
22
21
20
2
Data Out
SO
High−Z
Figure 2. SPI Read Sequence (Single Byte)
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4
3
N01S818HA
CS
SCK
0
1
2
3
4
5
6
7
8
9
23
22
10
Instruction
SI
0
0
0
0
29
11
30
31
1
0
32
33
0
1
1
21
20
2
ADDR 1
42
43
44
36
37
38
39
1
0
Don’t Care
Data Out from ADDR 1
7
High−Z
41
35
24−bit address
0
SO
40
34
45
46
47
48
49
50
51
52
53
54
55
1
0 ...
6
5
4
3
2
Don’t Care
Data Out from ADDR 3
Data Out from ADDR 2
7
6
5
4
3
2
1
0
7
6
5
4
3
2
Data Out from ADDR n
7
6
5
4
3
2
1
0
Figure 3. SPI Read Sequence (Sequential Bytes)
CS
SCK
0
1
2
3
4
5
Instruction
12
14
15
16
17
18
19
21
22
A3
23
24
25
A2
A1
A0
X
X
X
X H0 H0
L0
L0 H1 H1
MSB
C[3:0] = 03h
H0 = 2 high order bits of data byte 0
L0 = 2 low order bits of data byte 0
H1 = 2 high order bits of data byte 1
L1 = 2 low order bits of data byte 1
Figure 4. DUAL Read Sequence
CS
SCK
0
1
2
3
Instruction
SIO[3:0]
C1 C0
4
5
6
7
8
9
11
12
A4
A3
A2
A1
13
14
15
16
Data out
A0
X
X H0
MSB
Notes:
10
24−bit address
A5
26
Data out
MSB
Notes:
20
24−bit address
C3 C2 C1 C0 A11 A10
SIO[1:0]
13
L0 H1
MSB
C[1:0] = 03h
H0 = 4 high order bits of data byte 0
L0 = 4 low order bits of data byte 0
H1 = 4 high order bits of data byte 1
L1 = 4 low order bits of data byte 1
Figure 5. QUAD Read Sequence
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L1 H2
L2 H3
L3
L1
L1
N01S818HA
Write Operation
page and the operation can be continuously looped over the
32 words of the same page. The new data will replace data
already stored in the memory locations.
If operating in burst mode, after the initial word of data is
shifted in, additional data words can be written to the next
sequential memory locations by continuing to provide clock
pulses. The internal address pointer is automatically
incremented to the next higher address after each word of
data is read out. This can be continued for the entire array
and when the highest address is reached, 1FFFFh, the
address counter wraps to the address 00000h. This allows
the burst write cycle to be continued indefinitely. Again, the
new data will replace data already stored in the memory
locations.
All WRITE operations are terminated by pulling CS high.
The serial SRAM WRITE is selected by enabling CS low.
First, the 8-bit WRITE instruction is transmitted to the
device followed by the 24-bit address with the 7 MSBs being
don’t care. After the WRITE instruction and addresses are
sent, the data to be stored in memory is shifted in on the SI
pin.
If operating in page mode, after the initial word of data is
shifted in, additional data words can be written as long as the
address requested is sequential on the same page. Simply
write the data on SI pin and continue to provide clock pulses.
The internal address pointer is automatically incremented to
the next higher address on the page after each word of data
is written in. This can be continued for the entire page length
of 32 words long. At the end of the page, the addresses
pointer will be wrapped to the 0 word address within the
CS
SCK
0
1
2
3
4
5
6
7
8
9
23
22
10
Instruction
SI
0
0
0
0
0
11
29
30
31
32
33
2
1
0
7
6
53
54
55
24−bit address
0
1
0
21
20
34
35
36
37
38
39
1
0
Data In to ADDR 1
5
4
3
2
ADDR 1
High−Z
SO
40
41
42
43
44
45
46
47
48
Data In to ADDR 2
7
6
5
4
3
49
50
51
52
Data In to ADDR 3
2
1
0
7
6
5
4
3
Data In to ADDR n
2
1
0 ...
High−Z
Figure 6. SPI Write Sequence
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5
7
6
5
4
3
2
1
0
N01S818HA
CS
SCK
0
1
2
3
4
5
Instruction
12
14
15
17
18
19
A3
21
20
Data in
A2
A1
A0 H0 H0
L0
L0 H1 H1
Ln
Ln
Hn
Ln
MSB
MSB
Notes:
16
24−bit address
C3 C2 C1 C0 A11 A10
SIO1:0]
13
C[3:0] = 02h
H0 = 2 high order bits of data byte 0
L0 = 2 low order bits of data byte 0
H1 = 2 high order bits of data byte 1
L1 = 2 low order bits of data byte 1
Figure 7. DUAL Write Sequence
CS
SCK
0
1
2
3
Instruction
SIO[3:0]
C1 C0
4
5
6
7
9
10
11
24−bit address
A5
A4
A3
A2
A1
12
13
Data in
A0 H0
MSB
Notes:
8
L0 H1
L1 H2
L2
MSB
C[1:0] = 02h
H0 = 4 high order bits of data byte 0
L0 = 4 low order bits of data byte 0
H1 = 4 high order bits of data byte 1
L1 = 4 low order bits of data byte 1
Figure 8. QUAD Write Sequence
READ Mode Register (RDMR)
RDMR instruction to the device. Immediately after the
instruction, the device outputs data on the SO (SIO0-3)
pin(s). To complete the operation, drive CS high to terminate
the register read.
This instruction provides the ability to read the mode
register. The register may be read at any time including
during a Write operation. The Read Mode Register
operation is executed by driving CS low, then sending the
CS
SCK
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Instruction
SI
0
0
0
0
0
1
0
1
Mode Register Data Out
SO
High−Z
7
6
5
4
3
2
Figure 9. SPI Read Mode Register Sequence (RDMR)
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1
0
N01S818HA
CS
SCK
0
1
2
3
4
Instruction
SIO[1:0]
5
6
7
L
L
Notes: C[3:0] = 05h
Mode Bits
C3 C2 C1 C0
H
H
MSB
Figure 10. DUAL Read Mode Register Sequence (RDMR)
CS
SCK
0
1
2
3
C1 C0
H
C[1:0] = 05h
Notes:
Instruction Mode Bits
SIO[3:0]
L
MSB
Figure 11. QUAD Read Mode Register Sequence (RDMR)
Write Mode Register (WRMR)
This instruction provides the ability to write the mode
register. The Write Mode Register operation is executed by
driving CS low, then sending the WRMR instruction to the
device. Immediately after the instruction, the data is driven
to the device on the SO (SIO0-3) pin(s). To complete the
operation, drive CS high to terminate the register write.
CS
SCK
0
1
2
3
4
5
6
7
8
9
Instruction
SI
0
0
0
0
10
11
12
13
14
15
1
0
Mode Register Data In
0
0
0
1
7
6
5
4
3
2
High−Z
SO
Figure 12. SPI Write Mode Register Sequence
CS
SCK
0
1
2
3
Instruction
SIO[1:0]
C3 C2 C1 C0
4
5
6
7
Notes: C[3:0] = 01h
Mode Bits
H
H
L
L
MSB
Figure 13. DUAL Write Mode Register Sequence
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N01S818HA
CS
SCK
0
1
2
3
Instruction Mode Bits
SIO[3:0]
C1 C0
H
Notes:
L
C[1:0] = 01h
MSB
Figure 14. QUAD Write Mode Register Sequence
Table 5. MODE REGISTER
Bit
Operating Mode
Bit 7
Bit 6
0
0 = Word Mode
1
0 = Page Mode
0
1 = Burst Mode (Default)
1
1 = Reserved
6
Function
0
Hold Function
1 = Hold function disabled
0 = Hold function enabled (Default)
1
Reserved
2
Reserved
3
Reserved
4
Reserved
5
Reserved
7
Power-Up State
The serial SRAM enters a know state at power-up time.
The device is in low-power standby state with CS = 1. A low
level on CS is required to enter a active state.
Table 6. ABSOLUTE MAXIMUM RATINGS
Item
Voltage on any pin relative to VSS
Voltage on VCC Supply Relative to VSS
Power Dissipation
Storage Temperature
Operating Temperature
Soldering Temperature and Time
Symbol
Rating
Units
VIN,OUT
–0.3 to VCC +0.3
V
VCC
–0.3 to 5.5
V
PD
500
mW
TSTG
–40 to 125
°C
TA
-40 to +85
°C
TSOLDER
260°C, 10 sec
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 7. OPERATING CHARACTERISTICS (OVER SPECIFIED TEMPERATURE RANGE)
Item
Symbol
Test Conditions
Min
Typ (Note 1)
Units
2.2
V
Supply Voltage
VCC
Data Retention Voltage (Note 2)
VDR
Input High Voltage
VIH
0.7 VCC
VCC + 0.3
Input Low Voltage
VIL
−0.3
0.2 VCC
Output High Voltage
VOH
IOH = −0.4 mA
Output Low Voltage
VOL
IOL = 1 mA
0.2
V
ILI
CS = VCC, VIN = 0 to VCC
1.0
mA
Input Leakage Current
1.7
Max
1.0
V
VCC − 0.2
V
V
Output Leakage Current
ILO
CS = VCC, VOUT = 0 to VCC
1.0
mA
Operating Current
ICC
f = 20 MHz, IOUT = 0, SPI / DUAL
10
mA
Standby Current
ISB
CS = VCC, VIN = VSS or VCC
f = 20 MHz, IOUT = 0, QUAD
1. Typical values are measured at VCC = VCC Typ., TA = 25°C and are not 100% tested.
2. Typical lower limit of VCC when data will be retained in the memory array, not 100% tested.
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10
1
5
mA
N01S818HA
Table 8. CAPACITANCE (Note 3)
Symbol
Test Conditions
Max
Units
Input Capacitance
Item
CIN
VIN = 0 V, f = 1 MHz, TA = 25°C
Min
7
pF
I/O Capacitance
CI/O
VIN = 0 V, f = 1 MHz, TA = 25°C
7
pF
3. These parameters are verified in device characterization and are not 100% tested.
Table 9. TIMING TEST CONDITIONS
Item
Value
Input Pulse Level
0.1 VCC to 0.9 VCC
Input Rise and Fall Time
5 ns
Input and Output Timing Reference Levels
0.5 VCC
Output Load
CL = 30 pF
Operating Temperature
−40 to +85°C
Table 10. TIMING
Item
Symbol
Clock Frequency
fCLK
Clock Period
tCLK
Min
Max
Units
20
MHz
50
ns
Clock Rise Time
tR
20
ns
Clock Fall Time
tF
20
ns
Clock High Time
tHI
25
ns
Clock Low Time
tLO
25
ns
Clock Delay Time
tCLD
25
ns
CS Setup Time
tCSS
25
ns
CS Hold Time
tCSH
50
ns
CS Disable Time
tCSD
25
ns
SCK to CS
tSCS
5
ns
Data Setup Time
tSU
10
ns
Data Hold Time
tHD
10
ns
Output Valid From Clock Low
tV
25
Output Hold Time
tHO
Output Disable Time
tDIS
HOLD Setup Time
tHS
10
ns
HOLD Hold Time
tHH
10
ns
HOLD Low to Output High-Z
tHZ
10
ns
HOLD High to Output Valid
tHV
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0
ns
ns
20
50
ns
ns
N01S818HA
tCSD
tCLD
CS
tR
tF
tCSH
tSCS
tCSS
SCK
tSU
tHD
MSB in
SI
LSB in
High−Z
SO
Figure 15. SPI Input Timing
CS
tLO
tHI
tCSH
SCK
tV
SO
MSB out
LSB out
tDIS
Don’t Care
SI
Figure 16. SPI Output Timing
CS
tHS
tHS
tHH
SCK
tHH
SO
n+2
n+1
n
High−Z
tHV
n
tHZ
SI
n+2
n+1
n−1
tSU
n
Don’t Care
HOLD
Figure 17. SPI Hold Timing
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10
n
n−1
N01S818HA
tCSD
tCLD
CS
tR
tF
tCSH
tSCS
tCSS
SCK
tSU
tHD
MSB in
SI0
LSB in
Figure 18. QUAD Input Timing
CS
tLO
tHI
tCSH
SCK
tV
SIO
MSB out
LSB out
Figure 19. QUAD Output Timing
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tDIS
N01S818HA
PACKAGE DIMENSIONS
TSSOP8 3x4.4 / TSSOP8 (225 mil)
CASE 948BH
ISSUE O
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