256K x 36 and 512K x 18
9Mb, PIPELINE 'NO WAIT' STATE BUS
SRAM
FEATURES
• 100 percent bus utilization
• No wait cycles between Read and Write
• Internal self-timed write cycle
• Individual Byte Write Control
• Single R/W (Read/Write) control pin
• Clock controlled, registered address,
data and control
• Interleaved or linear burst sequence control using
MODE input
• Three chip enables for simple depth expansion
and address pipelining
• Power Down mode
• Common data inputs and data outputs
• CKE pin to enable clock and suspend operation
• JEDEC 100-pin TQFP, 165-ball PBGA and 119ball PBGA packages
• Power supply:
NVP: V
NLP: V
• JTAG Boundary Scan for PBGA packages
• Industrial temperature available
DD 2.5V (± 5%), VDDQ 2.5V (± 5%)
DD 3.3V (± 5%), VDDQ 3.3V/2.5V (± 5%)
DESCRIPTION
The 9 Meg 'NLP/NVP' product family feature high-speed,
low-power synchronous static RAMs designed to provide
a burstable, high-performance, 'no wait' state, device for
networking and communications applications. They are
organized as 256K words by 36 bits and 512K words by 18
bits, fabricated with ISSI's advanced CMOS technology.
Incorporating a 'no wait' state feature, wait cycles are
eliminated when the bus switches from read to write, or
write to read. This device integrates a 2-bit burst counter,
high-speed SRAM core, and high-drive capability outputs
into a single monolithic circuit.
All synchronous inputs pass through registers are controlled
by a positive-edge-triggered single clock input. Operations
may be suspended and all synchronous inputs ignored
when Clock Enable, CKE is HIGH. In this state the internal
device will hold their previous values.
All Read, Write and Deselect cycles are initiated by the
ADV input. When the ADV is HIGH the internal burst
counter is incremented. New external addresses can be
loaded when ADV is LOW.
Write cycles are internally self-timed and are initiated by
the rising edge of the clock inputs and when WE is LOW.
Separate byte enables allow individual bytes to be written.
A burst mode pin (MODE) defines the order of the burst
sequence. When tied HIGH, the interleaved burst sequence
is selected. When tied LOW, the linear burst sequence is
selected.
DQa-DQdSynchronous Data Input/Output
DQPa-DQPdParity Data I/O
MODEBurst Sequence Selection
VDD+3.3V/2.5V Power Supply
VSSGround for output Buffer
VDDQ
ZZSnooze Enable
Isolated Output Buffer Supply: +3.3V/2.5V
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IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
STATE DIAGRAM
READ
®
READ
READ
BURST
BEGIN
READ
BURST
BURST
READ
SYNCHRONOUS TRUTH TABLE
WRITE
READWRITE
DESELECT
DS
DS
WRITE
(1)
DSDS
BURST
DS
READ
BEGIN
WRITE
BURST
BURST
WRITE
WRITE
WRITE
BURST
Address
OperationUsed
CECE
CECE2
CECE
CECE
CE2ADV
CECE
WEWE
WE
WEWE
BWBW
BWx
BWBW
OEOE
OE
OEOE
CKECKE
CKECLK
CKECKE
Not SelectedN/AHXXLXXXL↑
Not SelectedN/AXLXLXXXL↑
Not SelectedN/AXXHLXXXL↑
Not Selected ContinueN/AXXXHXXXL↑
Begin Burst ReadExternal AddressLHLLHXLL↑
Continue Burst ReadNext AddressXXXHXXLL↑
NOP/Dummy ReadExternal AddressLHLLHXHL↑
Dummy ReadNext AddressXXXHXXHL↑
Begin Burst WriteExternal AddressLHLLLLXL↑
Continue Burst WriteNext AddressXXXHXLXL↑
NOP/Write AbortN/ALHLLLHXL↑
Write AbortNext AddressXXXHXHXL↑
Ignore ClockCurrent AddressXXXXXXXH↑
Notes:
1. "X" means don't care.
2. The rising edge of clock is symbolized by ↑
3. A continue deselect cycle can only be entered if a deselect cycle is executed first.
4. WE = L means Write operation in Write Truth Table.
WE = H means Read operation in Write Truth Table.
5. Operation finally depends on status of asynchronous pins (ZZ and OE).
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IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
®
ASYNCHRONOUS TRUTH TABLE
OperationZZ
(1)
OEOE
OEI/O STATUS
OEOE
Sleep ModeHXHigh-Z
Read
LLDQ
LHHigh-Z
WriteLXDin, High-Z
DeselectedLXHigh-Z
Notes:
1. X means "Don't Care".
2. For write cycles following read cycles, the output buffers must be disabled with OE, otherwise data bus
contention will occur.
3. Sleep Mode means power Sleep Mode where stand-by current does not depend on cycle time.
4. Deselected means power Sleep Mode where stand-by current depends on cycle time.
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IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
LINEAR BURST ADDRESS TABLE (MODE = VSS)
0,0
0,1A1', A0' = 1,1
1,0
®
ABSOLUTE MAXIMUM RATINGS
SymbolParameterValueUnit
TSTGStorage Temperature–65 to +150° C
PDPower Dissipation1.6W
IOUTOutput Current (per I/O)10 0mA
VIN, VOUTVoltage Relative to VSS for I/O Pins–0.5 to VDDQ + 0.3V
VINVoltage Relative to VSS for–0.3 to 4.6V
for Address and Control Inputs
Notes:
1. Stress greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at these or any other conditions above those indicated in the
operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods
may affect reliability.
2. This device contains circuity to protect the inputs against damage due to high static voltages or electric fields; however,
precautions may be taken to avoid application of any voltage higher than maximum rated voltages to this high-impedance
circuit.
This device contains circuitry that will ensure the output devices are in High-Z at power up.
3.
(1)
OPERATING RANGE (IS61NLPx)
RangeAmbient TemperatureVDDVDDQ
Commercial0°C to +70°C3.3V ± 5%3.3V / 2.5V ± 5%
Industrial-40°C to +85°C3.3V ± 5%3.3V / 2.5V ± 5%
OPERATING RANGE (IS61NVPx)
RangeAmbient TemperatureVDDVDDQ
Commercial0°C to +70°C2.5V ± 5% 2.5V ± 5%
Industrial-40°C to +85°C2.5V ± 5% 2.5V ± 5%
12
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IS61NLP51218A/IS61NVP51218AISSI
DC ELECTRICAL CHARACTERISTICS (Over Operating Range)
Clock High to Output Invalid0.8—1.5—ns
Clock High to Output Low-Z0. 8—1—ns
Clock High to Output High-Z—2. 6—3.1ns
tOEQOutput Enable to Output Valid—2.6—3.1ns
(2,3)
tOELZ
tOEHZ
(2,3)
Output Enable to Output Low-Z0—0—ns
Output Disable to Output High-Z—2.6—3.0ns
tASAddress Setup Time1.2—1.4—ns
tWSRead/Write Setup Time1.2—1.4—ns
tCESChip Enable Setup Time1. 2—1.4—ns
tSEClock Enable Setup Time1.2—1.4—ns
tADVSAddress Advance Setup Time1.2—1.4—ns
tDSData Setup Time1.2—1.4—ns
tAHAddress Hold Time0.3—0.4—ns
tHEClock Enable Hold Time0.3—0.4—ns
tWHWrite Hold Time0 .3—0.4—ns
tCEHChip Enable Hold Time0.3—0.4—ns
tADVHAddress Advance Hold Time0.3—0.4—ns
tDHData Hold Time0.3—0.4—ns
tPDSZZ High to Power Down—2—2cyc
tPUSZZ Low to Power Down—2—2cyc
Notes:
1. Configuration signal MODE is static and must not change during normal operation.
2. Guaranteed but not 100% tested. This parameter is periodically sampled.
3. Tested with load in Figure 2.
16
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IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
SLEEP MODE ELECTRICAL CHARACTERISTICS
SymbolParameterConditionsMin.Max.Unit
ISB2Current during SLEEP MODEZZ ≥ VIH60mA
tPDSZZ active to input ignored2cycle
tPUSZZ inactive to input sampled2cycle
tZZIZZ active to SLEEP current2cycle
tRZZIZZ inactive to exit SLEEP current0ns
SLEEP MODE TIMING
CLK
t
ZZ
PDS
ZZ setup cycleZZ recovery cycle
t
ZZI
t
PUS
®
Isupply
All Inputs
(except ZZ)
Outputs
(Q)
I
SB2
Deselect or Read Only
High-Z
RZZI
t
Deselect or Read Only
Normal
operation
cycle
Don't Care
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IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
READ CYCLE TIMING
t
KH
t
KL
CLK
t
KC
A3
ADV
Address
WRITE
CKE
t
ADVS
t
t
t
WS
CES
t
ADVH
AS
t
AH
A1
t
t
WH
CEH
A2
t
SE
t
HE
®
CE
OE
Data Out
t
t
OEQ
t
OEHZ
t
OEHZ
Q1-1
NOTES: WRITE = L means WE = L and BWx = L
WE = L and BWX = L
CE = L means CE1 = L, CE2 = H and CE2 = L
CE = H means CE1 = H, or CE1 = L and CE2 = H, or CE1 = L and CE2 = L
KQ
t
DS
Q3-3Q3-4Q3-2Q3-1Q2-4Q2-3Q2-2Q2-1
t
KQHZ
Don't Care
Undefined
18
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IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
WRITE CYCLE TIMING
t
KL
t
KH
CLK
t
KC
ADV
®
Address
WRITE
CKE
CE
OE
Data In
Data Out
A1
t
SE
t
HE
Q0-3 Q0-4
NOTES: WRITE = L means WE = L and BWx = L
WE = L and BWX = L
CE = L means CE1 = L, CE2 = H and CE2 = L
CE = H means CE1 = H, or CE1 = L and CE2 = H, or CE1 = L and CE2 = L
t
OEHZ
A2
A3
t
DS
t
DH
D3-3D3-4D3-2D3-1D2-4D2-3D2-2D2-1D1-1
Don't Care
Undefined
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IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
SINGLE READ/WRITE CYCLE TIMING
tKH t
KL
CLK
tSE t
HE
CKE
t
KC
®
Address
WRITE
CE
ADV
OE
Data Out
Data In
A1 A2 A3 A4 A5 A6 A7 A8 A9
t
OEQ
t
OELZ
Q1 Q3 Q4 Q6 Q7
t
DS
t
DH
D2
NOTES: WRITE = L means WE = L and BWx = L
CE = L means CE1 = L, CE2 = H and CE2 = L
CE = H means CE1 = H, or CE1 = L and CE2 = H, or CE1 = L and CE2 = L
D5
Don't Care
Undefined
20
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IS61NLP51218A/IS61NVP51218AISSI
CKE CKE
CKE OPERATION TIMING
CKE CKE
tKH t
KL
CLK
tSE t
HE
CKE
t
KC
®
Address
A1 A2 A3 A4 A5 A6
WRITE
CE
ADV
OE
t
KQ
t
Data Out
KQLZ
Q1 Q3 Q4
Data In
NOTES: WRITE = L means WE = L and BWx = L
CE = L means CE1 = L, CE2 = H and CE2 = L
CE = H means CE1 = H, or CE1 = L and CE2 = H, or CE1 = L and CE2 = L
t
KQHZ
t
DS
t
DH
D2
Don't Care
Undefined
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IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
CECE
CE OPERATION TIMING
CECE
tKH t
KL
CLK
tSE t
HE
CKE
t
KC
®
Address
WRITE
CE
ADV
OE
Data Out
Data In
A1 A2 A3 A4 A5
t
t
OEQ
OELZ
t
KQHZ
Q1 Q2 Q4
t
DS
t
DH
D3
NOTES: WRITE = L means WE = L and BWx = L
CE = L means CE1 = L, CE2 = H and CE2 = L
CE = H means CE1 = H, or CE1 = L and CE2 = H, or CE1 = L and CE2 = L
t
t
KQLZ
KQ
D5
Don't Care
Undefined
22
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IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
®
IEEE 1149.1 SERIAL BOUNDARY SCAN (JTAG)
The IS61NLP and IS61NVP have a serial boundary scan
Test Access Port (TAP) in the PBGA package only. (Not
available in TQFP package.) This port operates in accordance with
include all functions required for full 1149.1 compliance.
These functions from the
because they place added delay in the critical speed path
of the SRAM. The TAP controller operates in a manner that
does not conflict with the performance of other devices
using 1149.1 fully compliant TAPs. The TAP operates using
JEDEC standard 2.5V I/O logic levels.
IEEE
Standard 1149.1-1900, but does not
IEEE specification
are excluded
DISABLING THE JTAG FEATURE
The SRAM can operate without using the JTAG feature. To
disable the TAP controller, TCK must be tied LOW (VSS) to
prevent clocking of the device. TDI and TMS are internally
pulled up and may be disconnected. They may alternately
be connected to VDD through a pull-up resistor. TDO should
be left disconnected. On power-up, the device will start in a
reset state which will not interfere with the device operation.
TEST ACCESS PORT (TAP) - TEST CLOCK
The test clock is only used with the TAP controller. All
inputs are captured on the rising edge of TCK and outputs
are driven from the falling edge of TCK.
TEST MODE SELECT (TMS)
The TMS input is used to send commands to the TAP
controller and is sampled on the rising edge of TCK. This
pin may be left disconnected if the TAP is not used. The
pin is internally pulled up, resulting in a logic HIGH level.
TEST DATA-IN (TDI)
The TDI pin is used to serially input information to the
registers and can be connected to the input of any
register. The register between TDI and TDO is chosen by
the instruction loaded into the TAP instruction register.
For information on instruction register loading, see the
TAP Controller State Diagram. TDI is internally pulled up
and can be disconnected if the TAP is unused in an
application. TDI is connected to the Most Significant Bit
(MSB) on any register.
TAP CONTROLLER BLOCK DIAGRAM
0
Bypass Register
2 1 0
Instruction Register
Selection Circuitry Selection CircuitryTDOTDI
31 30 29
Identification Register
x
TCK
. . . . .
Boundary Scan
. . .
Register*
2 1 0
2 1 0
TMS
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IS61NLP25636A/IS61NVP25636A
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TEST DATA OUT (TDO)
The TDO output pin is used to serially clock data-out from
the registers. The output is active depending on the current
state of the
Diagram). The output changes on the falling edge of TCK
and TDO is connected to the Least Significant Bit (LSB) of
any register.
TAP
state machine (see
TAP
Controller State
PERFORMING A TAP RESET
A Reset is performed by forcing TMS HIGH (VDD) for five
rising edges of TCK. RESET may be performed while the
SRAM is operating and does not affect its operation. At
power-up, the TAP is internally reset to ensure that TDO
comes up in a high-Z state.
TAP REGISTERS
Registers are connected between the TDI and TDO pins
and allow data to be scanned into and out of the SRAM test
circuitry. Only one register can be selected at a time
through the instruction registers. Data is serially loaded
into the TDI pin on the rising edge of TCK and output on the
TDO pin on the falling edge of TCK.
Instruction Register
Three-bit instructions can be serially loaded into the
instruction register. This register is loaded when it is
placed between the
Block Diagram) At power-up, the instruction register is
loaded with the IDCODE instruction. It is also loaded with
the IDCODE instruction if the controller is placed in a reset
state as previously described.
When the TAP controller is in the CaptureIR state, the two
least significant bits are loaded with a binary “01” pattern
to allow for fault isolation of the board level serial test path.
TDI
and
TDO
pins. (See
TAP
Controller
Bypass Register
To save time when serially shifting data through registers,
it is sometimes advantageous to skip certain states. The
bypass register is a single-bit register that can be placed
between TDI and TDO pins. This allows data to be shifted
through the
SRAM
with minimal delay. The bypass register
is set LOW (VSS) when the BYPASS instruction is executed.
Boundary Scan Register
The boundary scan register is connected to all input and
output pins on the
also included in the scan register to reserve pins for higher
density devices. The x36 configuration has a 75-bit-long
register and the x18 configuration also has a 75-bit-long
register. The boundary scan register is loaded with the
contents of the RAM Input and Output ring when the TAP
controller is in the Capture-DR state and then placed
between the
to the
Shift-DR
and SAMPLE-Z instructions can be used to capture the
contents of the Input and Output ring.
The Boundary Scan Order tables show the order in which the
bits are connected. Each bit corresponds to one of the
bumps on the SRAM package. The MSB of the register is
connected to TDI, and the LSB is connected to TDO.
SRAM
. Several no connect
TDI
and
TDO
pins when the controller is moved
state. The EXTEST, SAMPLE/PRELOAD
(NC)
pins are
Scan Register Sizes
RegisterBit SizeBit Size
Name(x18)(x36)
Instruction33
Bypass11
ID3232
Boundary Scan7575
Identification (ID) Register
The ID register is loaded with a vendor-specific, 32-bit
code during the Capture-DR state when the IDCODE
command is loaded to the instruction register. The IDCODE
is hardwired into the SRAM and can be shifted out when
the TAP controller is in the Shift-DR state. The ID register
has vendor code and other information described in the
Identification Register Definitions table.
®
IDENTIFICATION REGISTER DEFINITIONS
Instruction FieldDescription256K x 36512K x 18
Revision Number (31:28)Reserved for version number.xxxxxxxx
Device Depth (27:23)Defines depth of SRAM. 256K or 512K0011101000
Device Width (22:18)Defines width of the SRAM. x36 or x180010000011
ISSI Device ID (17:12)Reserved for future use.xxxxxxxxxx
ISSI JEDEC ID (11:1)Allows unique identification of SRAM vendor.0001101010100011010101
ID Register Presence (0)Indicate the presence of an ID register.11
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®
TAP INSTRUCTION SET
Eight instructions are possible with the three-bit instruction
register and all combinations are listed in the Instruction
Code table. Three instructions are listed as
and should not be used and the other five instructions are
described below. The TAP controller used in this SRAM is
not fully compliant with the 1149.1 convention because
some mandatory instructions are not fully implemented.
The TAP controller cannot be used to load address, data or
control signals and cannot preload the
buffers. The
mands
SAMPLE/PRELOAD
Inputs and Output
Instructions are loaded into the TAP controller during the
Shift-IR state when the instruction register is placed
between TDI and TDO. During this state, instructions are
shifted from the instruction register through the TDI and
TDO pins. To execute an instruction once it is shifted in,
the TAP controller must be moved into the Update-IR
state.
SRAM
EXTEST
does not implement the
or
INTEST
; instead it performs a capture of the
ring when these instructions are executed.
or the
PRELOAD
RESERVED
Input
or
1149.1
portion of
Output
com-
EXTEST
EXTEST is a mandatory 1149.1 instruction which is to be
executed whenever the instruction register is loaded with
all 0s. Because EXTEST is not implemented in the TAP
controller, this device is not 1149.1 standard compliant.
The TAP controller recognizes an all-0 instruction. When
an EXTEST instruction is loaded into the instruction
register, the SRAM responds as if a SAMPLE/PRELOAD
instruction has been loaded. There is a difference between
the instructions, unlike the
EXTEST places the SRAM outputs in a High-Z state.
SAMPLE/PRELOAD
instruction,
IDCODE
The IDCODE instruction causes a vendor-specific, 32-bit
code to be loaded into the instruction register. It also
places the instruction register between the TDI and TDO
pins and allows the IDCODE to be shifted out of the device
when the TAP controller enters the Shift-DR state. The
IDCODE instruction is loaded into the instruction register
upon power-up or whenever the TAP controller is given a
test logic reset state.
SAMPLE-Z
The SAMPLE-Z instruction causes the boundary scan
register to be connected between the TDI and TDO pins
when the TAP controller is in a Shift-DR state. It also
places all SRAM outputs into a High-Z state.
SAMPLE/PRELOAD
SAMPLE/PRELOAD is a 1149.1 mandatory instruction.
The PRELOAD portion of this instruction is not implemented, so the TAP controller is not fully 1149.1 compliant. When the SAMPLE/PRELOAD instruction is loaded
to the instruction register and the TAP controller is in the
Capture-DR state, a snapshot of data on the inputs and
output pins is captured in the boundary scan register.
It is important to realize that the TAP controller clock
operates at a frequency up to 10 MHz, while the SRAM
clock runs more than an order of magnitude faster.
Because of the clock frequency differences, it is possible
that during the Capture-DR state, an input or output will
under-go a transition. The TAP may attempt a signal
capture while in transition (metastable state). The device
will not be harmed, but there is no guarantee of the value
that will be captured or repeatable results.
To guarantee that the boundary scan register will capture
the correct signal value, the SRAM signal must be
stabilized long enough to meet the TAP controller’s
capture set-up plus hold times (tCS and tCH). To insure that
the SRAM clock input is captured correctly, designs need
a way to stop (or slow) the clock during a SAMPLE/
PRELOAD instruction. If this is not an issue, it is possible
to capture all other signals and simply ignore the value of
the CLK captured in the boundary scan register.
Once the data is captured, it is possible to shift out the data
by putting the TAP into the Shift-DR state. This places the
boundary scan register between the TDI and TDO pins.
Note that since the
implemented, putting the
state while performing a
will have the same effect as the Pause-DR command.
PRELOAD
TAP
into the
SAMPLE/PRELOAD
part of the command is not
Update
to the
Update-DR
instruction
BYPASS
When the BYPASS instruction is loaded in the instruction
register and the TAP is placed in a Shift-DR state, the
bypass register is placed between the TDI and TDO pins.
The advantage of the BYPASS instruction is that it
shortens the boundary scan path when multiple devices
are connected together on a board.
RESERVED
These instructions are not implemented but are reserved
for future use. Do not use these instructions.
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IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
INSTRUCTION CODES
CodeInstructionDescription
00 0EXTESTCaptures the Input/Output ring contents. Places the boundary scan register between
the TDI and TDO. Forces all SRAM outputs to High-Z state. This
instruction is not 1149.1 compliant.
001IDCODELoads the ID register with the vendor ID code and places the register between
TDI and TDO. This operation does not affect SRAM operation.
010SAMPLE-ZCaptures the Input/Output contents. Places the boundary scan register between TDI
and TDO. Forces all SRAM output drivers to a High-Z state.
01 1RESERVEDDo Not Use: This instruction is reserved for future use.
®
100
10 1RESERVEDDo Not Use: This instruction is reserved for future use.
11 0RESERVEDDo Not Use: This instruction is reserved for future use.
111BYPASSPlaces the bypass register between TDI and TDO. This operation does not
SAMPLE/PRELOAD
Captures the Input/Output ring contents. Places the boundary scan register between
TDI and TDO. Does not affect the SRAM operation. This instruction does not
1149.1 preload function and is therefore not 1149.1 compliant.
affect SRAM operation.
TAP CONTROLLER STATE DIAGRAM
Test Logic Reset
10
Run Test/Idle
111
Select DR
00
11
Capture DR
0
Shift DR
0
1
Exit1 DR
11
0
Select IR
0
Capture IR
0
Shift IR
1
Exit1 IR
0
0
implement
26
Pause DR
Exit2 DR
0
1
Update DR
0
0
Pause IR
0
1
Update IR
11
Exit2 IR
11
0
0
Integrated Silicon Solution, Inc. — www.issi.com —
1-800-379-4774
Rev. A
05/04/05
IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
®
TAP Electrical Characteristics Over the Operating Range
(1,2)
SymbolParameterTest ConditionsMin.Max.Units
VOH1Output HIGH VoltageIOH = –2.0 mA1.7—V
VOH2Output HIGH VoltageIOH = –100 µA2.1—V
VOL1Output LOW VoltageIOL = 2.0 mA—0.7V
VOL2Output LOW VoltageIOL = 100 µA—0.2V
VIHInput HIGH Voltage1.7VDD +0.3V
VILInput LOW Voltage–0. 30.7V
IXInput Leakage CurrentVSS≤ V I ≤ VDDQ–1010
Notes:
1. All Voltage referenced to Ground.
2. Overshoot: V
Undershoot: VIL (AC) ≤ 0.5V for t ≤ tTCYC/2,
Power-up: V
TAP AC ELECTRICAL CHARACTERISTICS
IH (AC) ≤ VDD +1.5V for t ≤ tTCYC/2,
IH < 2.6V and VDD < 2.4V and VDDQ < 1.4V for t < 200 ms.
10—ns
tTDIHTDI Hold after Clock Rise1 0—ns
tCHCapture hold after Clock Rise10—ns
tTDOVTCK LOW to TDO valid—2 0ns
tTDOXTCK LOW to TDO invalid0—n s
Notes:
1. Both tCS and tCH refer to the set-up and hold time requirements of latching data from the boundary scan register.
2. Test conditions are specified using the load in TAP AC test conditions. tR/tF = 1 ns.
Integrated Silicon Solution, Inc. — www.issi.com —
Rev. A
05/04/05
1-800-379-4774
27
IS61NLP25636A/IS61NVP25636A
IS61NLP51218A/IS61NVP51218AISSI
®
TAP AC TEST CONDITIONS (2.5V/3.3V)
Input pulse levels0 to 2.5V/0 to 3.0V
Input rise and fall times1ns
Input timing reference levels1.25V/1.5V
Output reference levels1.25V/1.5V
Test load termination supply voltage1.25V/1.5V
Vtrig1.25V/1.5V
TAP TIMING
TAP Output Load Equivalent
50Ω
Vtrig
TDO
Z0 = 50Ω
20 pF
GND
1 2 3 4 5 6
t
TCK
THTH
t
MVTH tTHMX
t
TLTH
t
THTL
TMS
t
DVTH tTHDX
TDI
t
TLOV
TDO
t
TLOX
DON'T CARE
UNDEFINED
28
Integrated Silicon Solution, Inc. — www.issi.com —