ISSI IS61DDB42M18

36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
.
ISSI
®
May 2005
Features
• 1M x 36 or 2M x 18.
• On-chip delay-locked loop (DLL) for wide data
valid window.
• Common I/O read and write ports.
• Synchronous pipeline read with late write operation.
• Double data rate (DDR-II) interface for read and
write input ports.
• Fixed 4-bit burst for read and write operations.
• Clock stop support.
• Two input clocks (K and K) for address and control registering at rising edges only.
• Two input clocks (C and C) for data output control.
• Two echo clocks (CQ and CQ) that are delivered
simultaneously with data.
• +1.8V core power supply and 1.5, 1.8V VDDQ,
used with 0.75, 0.9V VREF.
• HSTL input and output levels.
• Registered addresses, write and read controls,
byte writes, and data outputs.
• Full data coherency.
• Boundary scan using limited set of JTAG 1149.1
functions.
• Byte write capability.
• Fine ball grid array (FBGA) package
- 15mm x 17mm body size
- 1mm pitch
- 165-ball (11 x 15) array
• Programmable impedance output drivers via 5x
user-supplied precision resistor.
Description
The 36Mb IS61DDB41M36 and IS61DDB42M18
are synchronous, high-performance CMOS static
random access memory (SRAM) devices. These
SRAMs have a common I/O bus. The rising edge of
K clock initiates the read/write operation, and all
internal operations are self-timed. Refer to the
Timing Reference Diagram for Truth Table on p.8
for a description of the basic operations of these
DDR-II (Burst of 4) CIO SRAMs.
Read and write addresses are registered on alternating rising edges of the K clock. Reads and writes
are performed in double data rate. The following are
registered internally on the rising edge of the K
clock:
•
•
•
•
•
Read and write addresses
Address load
Read/write enable
Byte writes for burst addresses 1 and 3
Data-in for burst addresses 1 and 3
The following are registered on the rising edge of
the K clock:
• Byte writes for burst addresses 2 and 4
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
• Data-in for burst addresses 2 and 4
Byte writes can change with the corresponding datain to enable or disable writes on a per-byte basis. An
internal write buffer enables the data-ins to be registered one cycle later than the write address. The first
data-in burst is clocked one cycle later than the write
command signal, and the second burst is timed to
the following rising edge of the K clock. Two full
clock cycles are required to complete a write operation.
During the burst read operation, at the first and third
bursts the data-outs are updated from output registers off the second and fourth rising edges of the C
clock (starting 1.5 cycles later). At the second and
fourth bursts, the data-outs are updated with the
third and fifth rising edges of the corresponding C
clock (see page 9). The K and K clocks are used to
time the data-outs whenever the C and C clocks are
tied high. Two full clock cycles are required to
complete a read operation
The device is operated with a single +1.8V power
supply and is compatible with HSTL I/O interfaces.
1
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
x36 FBGA Pinout (Top View)
1
2
3
4
5
6
7
8
9
10
11
A
CQ
VSS/SA*
SA
R/W
BW2
K
BW1
LD
SA
VSS/SA*
CQ
B
NC
DQ27
DQ18
SA
BW3
K
BW0
SA
NC
NC
DQ8
C
NC
NC
DQ28
VSS
SA
SA0
SA1
VSS
NC
DQ17
DQ7
D
NC
DQ29
DQ19
VSS
VSS
VSS
VSS
VSS
NC
NC
DQ16
E
NC
NC
DQ20
VDDQ
VSS
VSS
VSS
VDDQ
NC
DQ15
DQ6
F
NC
DQ30
DQ21
VDDQ
VDD
VSS
VDD
VDDQ
NC
NC
DQ5
G
NC
DQ31
DQ22
VDDQ
VDD
VSS
VDD
VDDQ
NC
NC
DQ14
H
Doff
VREF
VDDQ
VDDQ
VDD
VSS
VDD
VDDQ
VDDQ
VREF
ZQ
J
NC
NC
DQ32
VDDQ
VDD
VSS
VDD
VDDQ
NC
DQ13
DQ4
K
NC
NC
DQ23
VDDQ
VDD
VSS
VDD
VDDQ
NC
DQ12
DQ3
L
NC
DQ33
DQ24
VDDQ
VSS
VSS
VSS
VDDQ
NC
NC
DQ2
M
NC
NC
DQ34
VSS
VSS
VSS
VSS
VSS
NC
DQ11
DQ1
N
NC
DQ35
DQ25
VSS
SA
SA
SA
VSS
NC
NC
DQ10
P
NC
NC
DQ26
SA
SA
C
SA
SA
NC
DQ9
DQ0
R
TDO
TCK
SA
SA
SA
C
SA
SA
SA
TMS
TDI
• The following pins are reserved for higher densities: 2A for 144Mb, 10A for 72Mb.
• BW0 controls writes to DQ0–DQ8; BW1 controls writes to DQ9–DQ17; BW2 controls writes to DQ18–DQ26; BW3 controls
writes to DQ27–DQ35.
x18 FBGA Pinout (Top View)
1
2
3
4
5
6
7
8
9
10
11
A
CQ
VSS/SA*
SA
R/W
BW1
K
NC/SA
LD
SA
SA
CQ
B
NC
DQ9
NC
SA
NC/SA
K
BW0
SA
NC
NC
DQ8
C
NC
NC
NC
VSS
SA
SA0
SA1
VSS
NC
DQ7
NC
D
NC
NC
DQ10
VSS
VSS
VSS
VSS
VSS
NC
NC
NC
E
NC
NC
DQ11
VDDQ
VSS
VSS
VSS
VDDQ
NC
NC
DQ6
F
NC
DQ12
NC
VDDQ
VDD
VSS
VDD
VDDQ
NC
NC
DQ5
G
NC
NC
DQ13
VDDQ
VDD
VSS
VDD
VDDQ
NC
NC
NC
H
Doff
VREF
VDDQ
VDDQ
VDD
VSS
VDD
VDDQ
VDDQ
VREF
ZQ
J
NC
NC
NC
VDDQ
VDD
VSS
VDD
VDDQ
NC
DQ4
NC
K
NC
NC
DQ14
VDDQ
VDD
VSS
VDD
VDDQ
NC
NC
DQ3
L
NC
DQ15
NC
VDDQ
VSS
VSS
VSS
VDDQ
NC
NC
DQ2
M
NC
NC
NC
VSS
VSS
VSS
VSS
VSS
NC
DQ1
NC
N
NC
NC
DQ16
VSS
SA
SA
SA
VSS
NC
NC
NC
P
NC
NC
DQ17
SA
SA
C
SA
SA
NC
NC
DQ0
TDO
TCK
SA
SA
SA
C
SA
SA
SA
TMS
TDI
R
• The following pin is reserved for higher densities: 2A for 72Mb, 7A for 144Mb, 5B for 288Mb.
• BW0 controls writes to DQ0–DQ8; BW1 controls writes to DQ9–DQ17
2
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Pin Description
Symbol
Pin Number
Description
K, K
6B, 6A
Input clock.
C, C
6P, 6R
Input clock for output data control.
CQ, CQ
11A, 1A
Output echo clock.
Doff
1H
DLL disable when low.
SA0, SA1
6C, 7C
Burst count address inputs.
SA
9A, 4B, 8B, 5C, 5N, 6N, 7N, 4P, 5P, 7P, 8P, 3R, 4R, 5R, 7R, 8R,
9R
1M x 36 address inputs.
SA
3A, 9A, 4B, 8B, 5C, 5N, 6N, 7N, 4P, 5P, 7P, 8P, 3R, 4R, 5R, 7R,
8R, 9R
2M x 18 address inputs.
DQ0–DQ8
DQ9–DQ17
DQ18–DQ26
DQ27–DQ35
11P, 11M, 11L, 11K, 11J, 11F, 11E, 11C, 11B
10P, 11N, 10M, 10K, 10J, 11G, 10E, 11D, 10C
3B, 3D, 3E, 3F, 3G, 3K, 3L, 3N, 3P
2B, 3C, 2D, 2F, 2G, 3J, 2L, 3M, 2N
1M x 36 DQ pins
DQ0–DQ8
DQ9–DQ17
11P, 10M, 11L, 11K, 10J, 11F, 11E, 10C, 11B
2B, 3D, 3E, 2F, 3G, 3K, 2L, 3N, 3P
2M x 18 DQ pins
R/W
4A
Read/write control. Read when active high.
LD
8A
Synchronizes load. Loads new address
when low.
BW0, BW1, BW2, BW3 7B, 7A, 5A,5B
1M x 36 byte write control, active low.
BW0, BW1
7B, 5A
2M x 18 byte write control, active low.
VREF
2H, 10H
Input reference level.
VDD
5F, 7F, 5G, 7G, 5H, 7H, 5J, 7J, 5K, 7K
Power supply.
VDDQ
4E,8E,4F,8F,4G,8G,3H,4H,8H,9H,4J,8J,4K,8K,4L,8L
Output power supply.
VSS
2A, 10A, 4C, 8C, 4D, 5D, 6D, 7D, 8D, 5E, 6E, 7E, 6F, 6G, 6H, 6J,
Power supply.
6K, 5L, 6L, 7L, 4M, 8M, 4N, 8N
ZQ
11H
Output driver impedance control.
TMS, TDI, TCK
10R, 11R, 2R
IEEE 1149.1 test inputs (1.8V LVTTL levels).
TDO
1R
IEEE 1149.1 test output (1.8V LVTTL level).
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
3
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Block Diagram
36 (or 18)
Data
Reg
36 (or 18)
4 (or 2)
72
(or 36)
Output Driver
R/W
BWx
Control
Logic
1M x 36
(2M x 18)
Memory
Array
72
(or 36)
Output Reg
LD
18 (or 19)
Sense Amps
18 (or 19)
Write/Read Decode
Address
A0, A1
Output Select
Write Driver
Add Reg &
Burst
Control
36 (or 18)
DQ (Data-Out
& Data-In)
CQ, CQ
(Echo Clock Out)
K
K
C
Clock
Gen
Select Output Control
C
SRAM Features
Read Operations
The SRAM operates continuously in a burst-of-four mode. Read cycles are started by registering R/W in
active high state at the rising edge of the K clock. R/W can be activated every other cycle because two full
cycles are required to complete the burst-of-four read in DDR mode. A second set of clocks, C and C, are
used to control the timing to the outputs. A set of free-running echo clocks, CQ and CQ, are produced internally with timings identical to the data-outs. The echo clocks can be used as data capture clocks by the
receiver device.
When the C and C clocks are connected high, the K and K clocks assume the function of those clocks. In this
case, the data corresponding to the first address is clocked 1.5 cycles later by the rising edge of the K clock.
The data corresponding to the second burst is clocked 2 cycles later by the following rising edge of the K
clock. The third data-out is clocked by the subsequent rising edge of the K clock, and the fourth data-out is
clocked by the subsequent rising edge of the K clock.
Whenever LD is low, a new address is registered at the rising edge of the K clock. A NOP operation (LD is
high) does not terminate the previous read. The output drivers disable automatically to a high state.
Write Operations
Write operations can also be initiated at every other rising edge of the K clock whenever R/W is low. The write
address is also registered at that time. When the address needs to change, LD needs to be low simultaneously to be registered by the rising edge of K. Again, the write always occurs in bursts of four.
4
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
The write data is provided in a ‘late write’ mode; that is, the data-in corresponding to the first address of the
burst, is presented 1 cycle later or at the rising edge of the following K clock. The data-in corresponding to the
second write burst address follows next, registered by the rising edge of K. The third data-out is clocked by
the subsequent rising edge of the K clock, and the fourth data-out is clocked by the subsequent rising edge of
the K clock.
The data-in provided for writing is initially kept in write buffers. The information on these buffers is written into
the array on the third write cycle. A read cycle to the last two write address produces data from the write
buffers. The SRAM maintains data coherency.
During a write, the byte writes independently control which byte of any of the four burst addresses is written
(see X18/X36 Write Truth Tables on page 9 and Timing Reference Diagram for Truth Table on page 8).
Whenever a write is disabled (R/W is high at the rising edge of K), data is not written into the memory.
RQ Programmable Impedance
An external resistor, RQ, must be connected between the ZQ pin on the SRAM and VSS to enable the SRAM
to adjust its output driver impedance. The value of RQ must be 5x the value of the intended line impedance
driven by the SRAM. For example, an RQ of 250Ω results in a driver impedance of 50Ω. The allowable range
of RQ to guarantee impedance matching is between 175Ω and 350Ω, with the tolerance described in
Programmable Impedance Output Driver DC Electrical Characteristics on page 15. The RQ resistor should
be placed less than two inches away from the ZQ ball on the SRAM module. The capacitance of the loaded
ZQ trace must be less than 3 pF.
The ZQ pin can also be directly connected to VDDQ to obtain a minimum impedance setting. ZQ must never
be connected to VSS.
Programmable Impedance and Power-Up Requirements
Periodic readjustment of the output driver impedance is necessary as the impedance is greatly affected by
drifts in supply voltage and temperature. At power-up, the driver impedance is in the middle of allowable
impedances values. The final impedance value is achieved within 1024 clock cycles.
Clock Consideration
This device uses an internal DLL for maximum output data valid window. It can be placed in a stopped-clock
mode to minimize power and requires only 1024 cycles to restart.
No clocks can be issued until VDD reaches its allowable operating range.
Single Clock Mode
This device can be also operated in single-clock mode. In this case, C and C are both connected high at
power-up and must never change. Under this condition, K and K control the output timings.
Either clock pair must have both polarities switching and must never connect to VREF, as they are not differential clocks.
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
5
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Depth Expansion
The following figure depicts an implementation of four 2M x 18 DDR-II SRAMs with common I/Os. In this application example, the second pair of C and C clocks is delayed such that the return data meets the data setup
and hold times at the bus master.
Application Example
2M x 18
SRAM #1
SRAM #4
ZQ
R=250Ω
ZQ
DQ0–17
Vt
R
SA LD R/W BW0 BW1 C C K K
R=250Ω
DQ0–17
SA
LD R/W BW0 BW1 C C K K
Data-In/Data-Out
0–71
Address 0–79
Vt
R
LD
R/W
BW0–7
Memory
Controller
Return CLK
Source CLK
Vt
Return CLK
Vt
Source CLK
R=50Ω Vt=VREF
Power-Up and Power-Down Sequences
The power supplies must be powered up in the following order:
1.
2.
3.
4.
VDD
VDDQ
VREF
Inputs
The power-down sequence must be the reverse. VDDQ can be allowed to exceed VDD by no more than 0.6V.
6
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
State Diagram
Power Up
Load
NOP
Load
Write
Load New Address
Dcount = 0
Load
Dcount = 2
Load
Read
Load
Dcount = 2
Write
DDR-II Write
DDR-II Read
Dcount = Dcount + 1
Dcount = Dcount + 1
Read
Dcount = 1
Load
Always
Write
Dcount = 1
Always
Increment
Read Address
Increment
Write Address
Notes: 1. Internal burst counter is fixed as four-bit linear; that is, when first address is A0+0, next internal burst address is A0+1.
2. Read refers to read active status with R/W = high.
3. Write refers to write active status with R/W = low.
4. Load refers to read new address active status with LD = low.
5. Load is read new address inactive status with LD = high.
The Timing Reference Diagram for Truth Table on page 8 is helpful in understanding the clock and write truth
tables, as it shows the cycle relationship between clocks, address, data-in, data-out, and controls. All read
and write commands are issued at the beginning of cycles t and tw, respectively.
Linear Burst Sequence Table
Case 1
Case 2
Case 3
Case 4
Burst Sequence
SA1
SA0
SA1
SA0
SA1
SA0
SA1
SA0
First Address
0
0
0
1
1
0
1
1
Second Address
0
1
1
0
1
1
0
0
Third Address
1
0
1
1
0
0
0
1
Fourth Address
1
1
0
0
0
1
1
0
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
7
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Timing Reference Diagram for Truth Table
Cycle
t
t+1
t+2
NOP
Read A
tW+1
tW
Write B
tW+2
K Clock
K Clock
LD
R/W
BW 0,1,2,3
Address
A
B
QA
Data-In/Out (DQ)
QA+1
QA+2
QA+3
DB
DB+1
DB+2
DB+3
C Clock
C Clock
CQ Clock
CQ Clock
Clock Truth Table (Use the following table with the Timing Reference Diagram for Truth Table.)
Clock
Controls
Data Out / Data In
Mode
K
LD
R/W
QA / D B
QA+1 / DB+1
QA+2 / DB+2
QA+3 / DB+3
Stop Clock
Stop
X
X
Previous State
Previous State
Previous State
Previous State
No Operation (NOP)
L→H
H
H
High-Z
High-Z
High-Z
High-Z
Read B
L→H
L
H
Dout at C (t +
1.5)
Dout at C
(t + 2)
Dout at C
(t + 2.5)
Dout at C
(t + 3)
Write A
L→H
L
L
DB
(tW + 1)
DB
(tW + 1.5)
DB
(tW + 2)
DB
(tW + 2.5)
Notes:
1. The internal burst counter is always fixed as two-bit.
2. X = don’t care; H = logic “1”; L = logic “0”.
3. A read operation is started when control signal R/W is active high.
4. A write operation is started when control signal R/W is active low.
5. Before entering into the stop clock, all pending read and write commands must be completed.
6. For timing definitions, refer to the AC Characteristics on page 16. Signals must have AC specifications at timings indicated in
parenthesis with respect to switching clocks K, K, C, and C.
8
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
X36 Write Truth Table Use the following table with the Timing Reference Diagram for Truth Table on
page 8.
Operation
K
K
(tW+1) (tW+1.5)
K
K
(tW+2)
(tW+2.5)
BW0 BW1 BW2 BW3
DB
Write Byte 0
L→H
L
H
H
H
D0-8 (tW+1)
Write Byte 1
L→H
H
L
H
H
D9-17 (tW+1)
Write Byte 2
L→H
H
H
L
H
D18-26 (tW+1)
Write Byte 3
L→H
H
H
H
L
D27-35 (tW+1)
Write All Bytes
L→H
L
L
L
L
D0-35 (tW+1)
Abort Write
L→H
H
H
H
H
Don’t care
DB+1
Write Byte 0
L →H
L
H
H
H
D0-8 (tW+1.5)
Write Byte 1
L→H
H
L
H
H
D9-17 (tW+1.5)
Write Byte 2
L→H
H
H
L
H
D18-26 (tW+1.5)
Write Byte 3
L→H
H
H
H
L
D27-35 (tW+1.5)
Write All Bytes
L→H
L
L
L
L
D0-35 (tW+1.5)
Abort Write
L→H
H
H
H
H
Don’t care
DB+2
Write Byte 0
L→H
L
H
H
H
D0-8 (tW+2)
Write Byte 1
L→H
H
L
H
H
D9-17 (tW+2)
Write Byte 2
L→H
H
H
L
H
D18-26 (tW+2)
Write Byte 3
L→H
H
H
H
L
D27-35 (tW+2)
Write All Bytes
L→H
L
L
L
L
D0-35 (tW+2)
Abort Write
L→H
H
H
H
H
Don’t care
DB+3
Write Byte 0
L→H
L
H
H
H
D0-8 (tW+2.5)
Write Byte 1
L→H
H
L
H
H
D9-17 (tW+2.5)
Write Byte 2
L→H
H
H
L
H
D18-26 (tW+2.5)
Write Byte 3
L→H
H
H
H
L
D27-35 (tW+2.5)
Write All Bytes
L→H
L
L
L
L
D0-35 (tW+2.5)
Abort Write
L→H
H
H
H
H
Don’t care
Notes;
1. For all cases, R/W needs to be active low during the rising edge of K occurring at time tW
2. For timing definitions refer to the AC Characteristics on page 16. Signals must have AC specifications with respect to switching
clocks K and K.
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
9
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
X18 Write Truth Table Use the following table with the Timing Reference Diagram for Truth Table on
page 8.
Operation
K
K
K
K
(tW+1)
(tW+1.5)
(tW+2)
(tW+2.5)
BW0
BW1
DB
Write Byte 0
L→H
L
H
D0-8 (tW+1)
Write Byte 1
L→H
H
L
D9-17 (tW+1)
Abort Write
L→H
H
H
Don’t care
DB+1
Write Byte 0
L→H
L
H
D0-8 (tW+1.5)
Write Byte 1
L→H
H
L
D9-17 (tW+1.5)
Write All Bytes
L→H
L
L
D0-17 (tW+1.5)
Abort Write
L→H
H
H
Don’t care
DB+2
Write Byte 0
L→H
L
H
D0-8 (tW+2)
Write Byte 1
L→H
H
L
D9-17 (tW+2)
Write All Bytes
L→H
L
L
D0-17 (tW+2)
Abort Write
L→H
H
H
Don’t care
DB+3
Write Byte 0
L→H
L
H
D0-8 (tW+2.5)
Write Byte 1
L→H
H
L
D9-17 (tW+2.5)
Write All Bytes
L→H
L
L
D0-17 (tW+2.5)
Abort Write
L→H
H
H
Don’t care
Notes;
1. For all cases, R/W needs to be active low during the rising edge of K occurring at time tW
2. For timing definitions refer to the AC Characteristics on page 16. Signals must have AC specifications with respect to switching
clocks K and K.
10
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Absolute Maximum Ratings
Item
Symbol
Rating
Units
Power supply voltage
VDD
-0.5 to 2.6
V
Output power supply voltage
VDDQ
-0.5 to 2.6
V
VIN
-0.5 to 2.6
V
VDOUT
-0.5 to 2.6
V
Operating temperature
TA
0 to 70
°C
Junction temperature
TJ
110
°C
Storage temperature
TSTG
-55 to +125
°C
Input voltage
Data out voltage
Note: Stresses greater than those listed in this table can 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 datasheet is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
11
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Recommended DC Operating Conditions (TA = 0 to +70° C)
Parameter
Maximum
Units
Notes
1.8 - 5%
1.8 + 5%
V
1
VDDQ
1.4
1.9
V
1
Input high voltage
VIH
VREF +0.1
VDDQ + 0.2
V
1, 2
Input low voltage
VIL
-0.2
VREF - 0.1
V
1, 3
VREF
0.68
0.95
V
1, 5
VIN - CLK
-0.2
VDDQ + 0.2
V
1, 4
Supply voltage
Output driver supply voltage
Input reference voltage
Clocks signal voltage
1.
2.
3.
4.
5.
Symbol
Minimum
VDD
Typical
All voltages are referenced to VSS. All VDD, VDDQ, and VSS pins must be connected.
VIH(Max) AC = See 0vershoot and Undershoot Timings.
VIL(Min) AC = See 0vershoot and Undershoot Timings.
VIN-CLK specifies the maximum allowable DC excursions of each clock (K, K, C, and C).
Peak-to-peak AC component superimposed on VREF may not exceed 5% of VREF.
0vershoot and Undershoot Timings
20% Min Cycle Time
VIL(Min) AC
VDDQ+0.6V
Undershoot Timing
VDDQ
GND
VIH(Max) AC
Overshoot Timing
GND-0.6V
20% Min Cycle Time
PBGA Thermal Characteristics
Item
12
Symbol
Rating
Units
Thermal resistance junction to ambient (airflow = 1m/s)
RΘJA
TBD
° C/W
Thermal resistance junction to case
RΘJC
TBD
° C/W
Thermal resistance junction to pins
RΘJB
TBD
° C/W
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Capacitance (TA = 0 to + 70oC, VDD = 1.8V -5%, +5%, f = 1MHz)
Parameter
Symbol
Test Condition
Maximum
Units
Input capacitance
CIN
VIN = 0V
4
pF
Data-in/Out capacitance (DQ0–DQ35)
CDQ
VDIN = 0V
4
pF
Clocks Capacitance (K, K, C, C)
C CLK
VCLK = 0V
4
pF
DC Electrical Characteristics (TA = 0 to + 70oC, VDD = 1.8V -5%, +5%)
Parameter
x36 average power supply operating current
(IOUT = 0, VIN = VIH or VIL)
Symbol
IDD30
IDD40
IDD50
x18 average power supply operating current
(IOUT = 0, VIN = VIH or VIL)
IDD30
Minimum
Maximum
—
—
—
600
550
500
600
550
500
Units
Notes
mA
1
mA
1
IDD50
—
—
—
ISBSS
—
200
mA
Input leakage current, any input (except JTAG)
(VIN = VSS or VDD)
ILI
-2
+2
uA
Output leakage current
(VOUT = VSS or VDDQ, Q in High-Z)
ILO
-5
+5
uA
Output “high” level voltage (IOH = -6mA)
VOH
VDDQ -0.4
VDDQ
V
2, 3
Output “low” level voltage (IOL = +6mA)
VOL
VSS
VSS +0.4
V
2, 3
ILIJTAG
-100
+100
uA
4
Power supply standby current
(R = VIH, W = VIH. All other inputs = VIH or VIH, IIH = 0)
JTAG leakage current
(VIN = VSS or VDD)
1.
2.
3.
4.
5.
1
IOUT = chip output current.
Minimum impedance output driver.
JEDEC Standard JESD8-6 Class 1 compatible.
For JTAG inputs only.
Currents are estimates only and need to be verified.
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
IDD40
13
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Typical AC Input Characteristics
Item
Symbol
Minimum
AC input logic high
VIH (ac)
VREF + 0.4
AC input logic low
VIL (ac)
Clock input logic high (K, K, C, C)
VIH-CLK (ac)
Clock input logic low (K, K, C, C)
VIL-CLK (ac)
1.
2.
3.
4.
Maximum
Notes
1, 2, 3, 4
VREF - 0.4
VREF + 0.4
1, 2, 3, 4
1, 2, 3
VREF - 0.4
1, 2, 3
The peak-to-peak AC component superimposed on VREF may not exceed 5% of the DC component of VREF.
Performance is a function of VIH and VIL levels to clock inputs.
See the AC Input Definition diagram.
See the AC Input Definition diagram. The signals should swing monotonically with no steps rail-to-rail with input signals never ringing back past VIH (AC) and VIL (AC) during the input setup and input hold window. VIH (AC) and VIL (AC) are used for timing purposes only.
AC Input Definition
K
VREF
K
VRAIL
VIH (AC)
VREF
Setup
Time
Hold
Time
VIL (AC)
V-RAIL
Programmable Impedance Output Driver DC Electrical Characteristics
(TA = 0 to +70° C, VDD = 1.8V -5%, +5%, VDDQ = 1.5, 1.8V)
Parameter
Symbol
Minimum
Output “high” level voltage
VOH
VDDQ / 2
VDDQ
V
1, 3
Output “low” level voltage
VOL
VSS
VDDQ / 2
V
2, 3
VDDQ
Maximum
Units
Notes
RQ

- ⁄  -------- ± 15% @ V
1. IOH =  ---------------- 5 
OH = VDDQ / 2 For: 175Ω ≤RQ ≤350Ω.
2 
 VDDQ- ⁄  RQ
--------
2. IOL =  ---------------- 5  ± 15% @ VOL = VDDQ / 2 For: 175Ω ≤RQ ≤350Ω.
2 
3. Parameter tested with RQ = 250Ω and VDDQ = 1.5V.
14
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
AC Test Conditions (TA = 0 to +70° C, VDD = 1.8V -5%, +5%, VDDQ = 1.5, 1.8V)
Parameter
Symbol
Conditions
Units
VDDQ
1.5, 1.8
V
Input high level
VIH
VREF+0.5
V
Input Low Level
VIL
VREF-0.5
V
VREF
0.75, 0.9
V
Input rise time
TR
0.35
ns
Input fall time
TF
0.35
ns
Output timing reference level
VREF
V
Clocks reference level
VREF
V
Output driver supply voltage
Input reference voltage
Output load conditions
Notes
1, 2
1. See AC Test Loading.
2. Parameter tested with RQ = 250Ω and VDDQ = 1.5V.
AC Test Loading
50 Ω
Q
50 Ω
0.75, 0.9V
5pF
Test
Comparator
0.75, 0.9V
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
15
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
AC Characteristics (TA = 0 to + 70oC, VDD = 1.8V -5%, +5%)
Parameter
Symbol
30
(333MHz)
Units
Min
Max
3.0
3.6
ns
0.12
ns
Notes
Clock
Cycle time (K, K, C, C)
tKHKH
Clock phase jitter (K, K, C, C)
tKC-VAR
Clock high pulse (K, K, C, C)
tKHKL
1.2
ns
Clock low pulse (K, K, C, C)
tKLKH
1.2
ns
Clock to clock (KH>KH, CH>CH)
tKHKH
1.3
ns
Clock to data clock (KH>CH, KH>CH)
tKHCH
0.0
DLL lock (K, C)
tKC-lock
1024
cycle
K static to DLL reset
tKC-reset
30
cycle
1.3
ns
Output Times
C, C high to output valid
tCHQV
C, C high to output hold
tCHQX
C, C high to echo clock valid
tCHCQV
C, C high to echo clock hold
tCHCQX
CQ, CQ high to output valid
tCQHQV
CQ, CQ high to output hold
tCQHQX
0.27
-0.27
0.25
-0.25
0.27
-0.27
0.27
ns
1, 3
ns
1, 3
ns
3
ns
3
ns
1, 3
ns
1, 3
ns
1, 3
ns
1, 3
C high to output high-Z
tCHQZ
C high to output low-Z
tCHQX1
-0.27
Address valid to K, K rising edge
tAVKH
0.33
—
ns
2
Control inputs valid to K rising edge
tIVKH
0.33
—
ns
2
Data-in valid to K, K rising edge
tDVKH
0.30
—
ns
2
K rising edge to address hold
tKHAX
0.33
—
ns
2
K rising edge to control inputs hold
tKHIX
0.33
—
ns
2
K, K rising edge to data-in hold
tKHDX
0.30
—
ns
2
Setup Times
Hold Times
1. See AC Test Loading on page 15.
2. During normal operation, VIH, VIL, TRISE, and TFALL of inputs must be within 20% of VIH, VIL, TRISE, and TFALL of clock.
3. If C, C are tied high, then K, K become the references for C, C timing parameters.
16
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
AC Characteristics (TA = 0 to + 70oC, VDD = 1.8V -5%, +5%)
Parameter
Symbol
40
(250MHz)
50
(200MHz)
Units
Min
Max
Min
Max
4.0
5.85
5.0
6.3
ns
0.2
ns
Notes
Clock
Cycle time (K, K, C, C)
tKHKH
Clock phase jitter (K, K, C, C)
tKC-VAR
0.2
Clock high pulse (K, K, C, C)
tKHKL
1.6
2.0
ns
Clock low pulse (K, K, C, C)
tKLKH
1.6
2.0
ns
Clock to clock (KH>KH, CH>CH)
tKHKH
1.8
2.2
ns
Clock to data clock (KH>CH, KH>CH)
tKHCH
0.0
DLL lock (K, C)
tKC-lock
1024
1024
cycle
K static to DLL reset
tKC-reset
30
30
cycle
1.8
0.0
2.3
ns
Output Times
C, C high to output valid
tCHQV
C, C high to output hold
tCHQX
C, C high to echo clock valid
tCHCQV
C, C high to echo clock hold
tCHCQX
CQ, CQ High to output valid
tCQHQV
CQ, CQ high to output hold
tCQHQX
0.35
-0.35
0.38
-0.38
0.33
-0.33
0.36
-0.36
0.35
-0.35
0.36
-0.36
0.35
0.38
ns
1, 3
ns
1, 3
ns
3
ns
3
ns
1, 3
ns
1, 3
ns
1, 3
ns
1, 3
C High to output high-Z
tCHQZ
C High to output low-Z
tCHQX1
-0.35
Address valid to K, K rising edge
tAVKH
0.4
—
0.5
—
ns
2
Control inputs valid to K rising edge
tIVKH
0.4
—
0.5
—
ns
2
Data-in valid to K, K rising edge
tDVKH
0.35
—
0.4
—
ns
2
K rising edge to address hold
tKHAX
0.4
—
0.5
—
ns
2
K rising edge to Control Inputs Hold
tKHIX
0.4
—
0.5
—
ns
2
K, K rising edge to data-in hold
tKHDX
0.35
—
0.4
—
ns
2
-0.38
Setup Times
Hold Times
1. See AC Test Loading on page 15.
2. During normal operation, VIH, VIL, TRISE, and TFALL of inputs must be within 20% of VIH, VIL, TRISE, and TFALL of clock.
3. If C, C are tied high, then K, K become the references for C, C timing parameters.
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
17
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Read, Write, and NOP Timing Diagram
NOP
1
Read
Read
(burst of 4)
(burst of 4)
2
3
4
NOP
5
6
NOP
Write
(Note 3)
(burst of 4)
Read
7
8
(burst of 4)
9
10
11
12
K
tKHKH
tKHKL
tKLKH
tKHKH
K
tKHIX
tIVKH
LD
R/W
tKHAX
tAVKH
SA
A0
A1
A2
A3
tKHDX
tDVKH
DQ
Q01 Q02 Q03
Q04 Q11 Q12 Q13
tKHCH
Q14
D21 D22 D23 D24
Q31 Q32 Q33
tCHQV
C
tCHQX
tCHQX
tCHQV
tCHQZ
C
tKHKL
tKLKH
tKHKH
tKHKH
tCHCQH
CQ
tCQHQV
tCQHQX
tCQHQZ
CQ
Don’t Care
Undefined
Notes:
1. Q01 refers to the output from address A. Q02 refers to the output from the next internal burst address following A.
2. Outputs are disabled (high impedance) one clock cycle after a NOP.
3. The second NOP cycle is not necessary for correct device operation, however, at high clock frequencies, it
might be required to prevent bus contention.
18
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
IEEE 1149.1 TAP and Boundary Scan
The SRAM provides a limited set of JTAG functions to test the interconnection between SRAM I/Os and
printed circuit board traces or other components. There is no multiplexer in the path from I/O pins to the RAM
core.
In conformance with IEEE Standard 1149.1, the SRAM contains a TAP controller, instruction register,
boundary scan register, bypass register, and ID register.
The TAP controller has a standard 16-state machine that resets internally on power-up. Therefore, a TRST
signal is not required.
Signal List
•
•
•
•
TCK: test clock
TMS: test mode select
TDI: test data-in
TDO: test data-out
JTAG DC Operating Characteristics (TA = 0 to +70° C)
Operates with JEDEC Standard 8-5 (1.8V) logic signal levels
Parameter
Symbol
Minimum
Typical
Maximum
Units
Notes
JTAG input high voltage
VIH1
1.3
—
VDD+0.3
V
1
JTAG input low voltage
VIL1
-0.3
—
0.5
V
1
JTAG output high level
VOH1
VDD-0.4
—
VDD
V
1, 2
JTAG output low level
VOL1
VSS
—
0.4
V
1, 3
1.
2.
3.
All JTAG inputs and outputs are LVTTL-compatible.
IOH1 ≥ -|2mA|
IOL1 ≥ +|2mA|.
JTAG AC Test Conditions (TA = 0 to +70° C, VDD = 1.8V -5%, +5%)
Parameter
Symbol
Conditions
Units
Input pulse high level
VIH1
1.3
V
Input pulse low level
VIL1
0.5
V
Input rise time
TR1
1.0
ns
Input fall time
TF1
1.0
ns
0.9
V
Input and output timing reference level
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
19
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
JTAG AC Characteristics (TA = 0 to +70° C, VDD = 1.8V -5%, +5%)
Parameter
Symbol
Minimum
Maximum
Units
TCK cycle time
tTHTH
20
—
ns
TCK high pulse width
tTHTL
7
—
ns
TCk low pulse width
tTLTH
7
—
ns
TMS setup
tMVTH
4
—
ns
TMS hold
tTHMX
4
—
ns
TDI setup
tDVTH
4
—
ns
TDI hold
tTHDX
4
—
ns
TCK low to valid data
tTLOV
—
7
ns
Notes
1
1. See AC Test Loading on page 15.
JTAG Timing Diagram
tTHTL
tTLTH
tTHTH
TCK
tTHMX
TMS
tMVTH
tTHDX
TDI
tDVTH
TDO
tTLOV
20
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Scan Register Definition
Register Name
Bit Size x18 or x36
Instruction
3
Bypass
1
ID
32
Boundary Scan
109
ID Register Definition
Field Bit Number and Description
Part
Revision Number
(31:29)
Part Configuration
(28:12)
2M x 18
000
00def0wx0t0q0b0s0
000 101 001 00
1
1M x 36
000
00def0wx0t0q0b0s0
000 101 001 00
1
JEDEC Code
(11:1)
Start Bit
(0)
Part Configuration Definition:
def = 010 for 36Mb
wx = 11 for x36, 10 for x18
t = 1 for DLL, 0 for non-DLL
q = 1 for QUADB4, 0 for DDR-II
b = 1 for burst of 4, 0 for burst of 2
s = 1 for separate I/0, 0 for common I/O
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
21
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Instruction Set
Code
Instruction
TDO Output
Notes
000
EXTEST
Boundary Scan Register
2,6
001
IDCODE
32-bit Identification Register
010
SAMPLE-Z
Boundary Scan Register
1, 2
011
PRIVATE
Do not use
5
100
SAMPLE
Boundary Scan Register
4
101
PRIVATE
Do not use
5
110
PRIVATE
Do not use
5
111
BYPASS
Bypass Register
3
1. Places Qs in high-Z in order to sample all input data, regardless of other SRAM inputs.
2. TDI is sampled as an input to the first ID register to allow for the serial shift of the external TDI data.
3. BYPASS register is initiated to VSS when BYPASS instruction is invoked. The BYPASS register also holds the last serially loaded
TDI when exiting the shift-DR state.
4. SAMPLE instruction does not place DQs in high-Z.
5. This instruction is reserved. Invoking this instruction will cause improper SRAM functionality.
6. This EXTEST is not IEEE 1149.1-compliant. By default, it places Q in high-Z. If the internal register on the scan chain is set high,
Q will be updated with information loaded via a previous SAMPLE instruction. The actual transfer occurs during the update IR
state after EXTEST is loaded. The value of the internal register can be changed during SAMPLE and EXTEST only.
List of IEEE 1149.1 Standard Violations
•
•
•
•
•
7.2.1.b, e
7.7.1.a-f
10.1.1.b, e
10.7.1.a-d
6.1.1.d
JTAG Block Diagram
TDI
Bypass Register (1 bit)
Identification Register (32 bits)
TDO
Instruction Register (3 bits)
Control Signals
TMS
TAP Controller
TCK
22
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
TAP Controller State Machine
1
Test Logic Reset
0
0
Run Test Idle
1
1
Select DR
0
0
1
1
Select IR
1
Capture IR
Capture DR
0
0
0
Shift IR
0
Shift DR
1
1
1
1
Exit1 IR
Exit1 DR
0
0
0
0
Pause DR
Pause IR
1
1
Exit2 DR
Exit2 IR
0
0
1
1
Update DR
0
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
1
Update IR
1
0
23
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
Boundary Scan Exit Order The same length is used for x18 and x36 I/O configuration.
Order
Pin ID
Order
Pin ID
Order
Pin ID
1
6R
37
2
6P
37
10D
73
2C
9E
74
3E
3
6N
4
7P
39
10C
75
2D
40
11D
76
2E
5
7N
41
9C
77
1E
6
7R
42
9D
78
2F
7
8R
43
11B
79
3F
8
8P
44
11C
80
1G
9
9R
45
9B
81
1F
10
11P
46
10B
82
3G
11
10P
47
11A
83
2G
12
10N
48
10A
84
1H
13
9P
49
9A
85
1J
14
10M
50
8B
86
2J
15
11N
51
7C
87
3K
16
9M
52
6C
88
3J
17
9N
53
8A
89
2K
18
11L
54
7A
90
1K
19
11M
55
7B
91
2L
20
9L
56
6B
92
3L
21
10L
57
6A
93
1M
22
11K
58
5B
94
1L
23
10K
59
5A
95
3N
24
9J
60
4A
96
3M
25
9K
61
5C
97
1N
26
10J
62
4B
98
2M
27
11J
63
3A
99
3P
28
11H
64
2A
100
2N
29
10G
65
1A
101
2P
30
9G
66
2B
102
1P
31
11F
67
3B
103
3R
32
11G
68
1C
104
4R
33
9F
69
1B
105
4P
34
10F
70
3D
106
5P
35
11E
71
3C
107
5N
36
10E
72
1D
108
5R
109
Internal
1) NC pins as defined on FBGA pinouts on page 2 are read as “don’t cares”.
2) State of Internal pin (#109) is loaded via JTAG.
24
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
11 x 15 FBGA Dimensions
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04
25
36 Mb (1M x 36 & 2M x 18)
DDR-II (Burst of 4) CIO Synchronous SRAMs
ISSI
®
ORDERING INFORMATION
Commercial Range: 0°C to +70°C
26
Speed
Order Part No.
250 MHz
IS61DDB41M36-250M3
IS61DDB42M18-250M3
Organization
Package
1Mx36
2Mx18
165 BGA
165 BGA
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
07/09/04