8640Zxx V

GS8640Z18/36T-xxxV
100-Pin TQFP
Commercial Temp
Industrial Temp
72Mb Pipelined and Flow Through
Synchronous NBT SRAM
Features
• NBT (No Bus Turn Around) functionality allows zero wait
read-write-read bus utilization; Fully pin-compatible with
both pipelined and flow through NtRAM™, NoBL™ and
ZBT™ SRAMs
• 1.8 V or 2.5 V core power supply
• 1.8 V or 2.5 V I/O supply
• User-configurable Pipeline and Flow Through mode
• LBO pin for Linear or Interleave Burst mode
• Pin compatible with 4Mb, 9Mb, 18Mb and 36Mb devices
• Byte write operation (9-bit Bytes)
• 3 chip enable signals for easy depth expansion
• ZZ Pin for automatic power-down
• JEDEC-standard 100-lead TQFP package
• RoHS-compliant 100-lead TQFP package available
Functional Description
The GS8640Z18/36T-xxxV is a 72Mbit Synchronous Static
SRAM. GSI's NBT SRAMs, like ZBT, NtRAM, NoBL or
other pipelined read/double late write or flow through read/
single late write SRAMs, allow utilization of all available bus
bandwidth by eliminating the need to insert deselect cycles
when the device is switched from read to write cycles.
250 MHz–167 MHz
1.8 V or 2.5 V VDD
1.8 V or 2.5 V I/O
Because it is a synchronous device, address, data inputs, and
read/ write control inputs are captured on the rising edge of the
input clock. Burst order control (LBO) must be tied to a power
rail for proper operation. Asynchronous inputs include the
Sleep mode enable (ZZ) and Output Enable. Output Enable can
be used to override the synchronous control of the output
drivers and turn the RAM's output drivers off at any time.
Write cycles are internally self-timed and initiated by the rising
edge of the clock input. This feature eliminates complex offchip write pulse generation required by asynchronous SRAMs
and simplifies input signal timing.
The GS8640Z18/36T-xxxV may be configured by the user to
operate in Pipeline or Flow Through mode. Operating as a
pipelined synchronous device, meaning that in addition to the
rising edge triggered registers that capture input signals, the
device incorporates a rising-edge-triggered output register. For
read cycles, pipelined SRAM output data is temporarily stored
by the edge triggered output register during the access cycle
and then released to the output drivers at the next rising edge of
clock.
The GS8640Z18/36T-xxxV is implemented with GSI's high
performance CMOS technology and is available in a JEDECstandard 100-pin TQFP package.
Parameter Synopsis
Pipeline
3-1-1-1
Flow Through
2-1-1-1
Rev: 1.03b 2/2009
tKQ
tCycle
Curr (x18)
Curr (x32/x36)
tKQ
tCycle
Curr (x18)
Curr (x32/x36)
-250
3.0
4.0
-200
3.0
5.0
-167
3.4
6.0
Unit
ns
ns
340
410
290
350
260
305
mA
mA
6.5
6.5
245
280
7.5
7.5
220
250
8.0
8.0
210
240
ns
ns
mA
mA
1/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
A
A
E1
E2
NC
NC
BB
BA
E3
VDD
VSS
CK
W
CKE
G
ADV
A
A
A
A
GS8640Z18T-xxxV Pinout (Package T)
NC
NC
NC
VDDQ
A
NC
NC
VDDQ
VSS
NC
DQPA
DQA
DQA
VSS
VDDQ
DQA
DQA
VSS
NC
VDD
ZZ
DQA
DQA
VDDQ
VSS
DQA
DQA
NC
NC
VSS
VDDQ
NC
NC
NC
LBO
A
A
A
A
A1
A0
NC
NC
VSS
VDD
A
A
A
A
A
A
A
A
A
VSS
NC
NC
DQB
DQB
VSS
VDDQ
DQB
DQB
FT
VDD
NC
VSS
DQB
DQB
VDDQ
VSS
DQB
DQB
DQPB
NC
VSS
VDDQ
NC
NC
NC
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81
1
80
2
79
3
78
4
77
5
76
6
75
7
74
8
73
9
72
4M x 18
10
71
Top View
11
70
12
69
13
68
14
67
15
66
16
65
17
64
18
63
19
62
20
61
21
60
22
59
23
58
24
57
25
56
26
55
27
54
28
53
29
52
30
51
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
Note:
Pins marked with NC can be tied to either VDD or VSS. These pins can also be left floating.
Rev: 1.03b 2/2009
2/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
A
A
E1
E2
BD
BC
BB
BA
E3
VDD
VSS
CK
W
CKE
G
ADV
A
A
A
A
GS8640Z36T-xxxV Pinout (Package T)
DQPC
DQC
DQC
VDDQ
DQPB
DQB
DQB
VDDQ
VSS
DQB
DQB
DQB
DQB
VSS
VDDQ
DQB
DQB
VSS
NC
VDD
ZZ
DQA
DQA
VDDQ
VSS
DQA
DQA
DQA
DQA
VSS
VDDQ
DQA
DQA
DQPA
LBO
A
A
A
A
A1
A0
NC
NC
VSS
VDD
A
A
A
A
A
A
A
A
A
VSS
DQC
DQC
DQC
DQC
VSS
VDDQ
DQC
DQC
FT
VDD
NC
VSS
DQD
DQD
VDDQ
VSS
DQD
DQD
DQD
DQD
VSS
VDDQ
DQD
DQD
DQPD
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81
1
80
2
79
3
78
4
77
5
76
6
75
7
74
8
73
9
72
2M x 36
10
71
Top View
11
70
12
69
13
68
14
67
15
66
16
65
17
64
18
63
19
62
20
61
21
60
22
59
23
58
24
57
25
56
26
55
27
54
28
53
29
52
30
51
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
Note:
Pins marked with NC can be tied to either VDD or VSS. These pins can also be left floating.
Rev: 1.03b 2/2009
3/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
TQFP Pin Descriptions
Symbol
Type
Description
A 0, A 1
In
Burst Address Inputs; Preload the burst counter
A
In
Address Inputs
CK
In
Clock Input Signal
BA
In
Byte Write signal for data inputs DQA1-DQA9; active low
BB
In
Byte Write signal for data inputs DQB1-DQB9; active low
BC
In
Byte Write signal for data inputs DQC1-DQC9; active low
BD
In
Byte Write signal for data inputs DQD1-DQD9; active low
W
In
Write Enable; active low
E1
In
Chip Enable; active low
E2
In
Chip Enable; Active High. For self decoded depth expansion
E3
In
Chip Enable; Active Low. For self decoded depth expansion
G
In
Output Enable; active low
ADV
In
Advance/Load; Burst address counter control pin
CKE
In
Clock Input Buffer Enable; active low
DQA
I/O
Byte A Data Input and Output pins
DQB
I/O
Byte B Data Input and Output pins
DQC
I/O
Byte C Data Input and Output pins
DQD
I/O
Byte D Data Input and Output pins
ZZ
In
Power down control; active high
FT
In
Pipeline/Flow Through Mode Control; active low
LBO
In
Linear Burst Order; active low
VDD
In
Core power supply
VSS
In
Ground
VDDQ
In
Output driver power supply
NC
—
No Connect
Rev: 1.03b 2/2009
4/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Register 1
Register 2
K
Write Data
Write Data
K
D
Q
K
FT
DQa–DQn
GS8640Z18/36T-xxxV NBT SRAM Functional Block Diagram
Memory
Array
Sense Amps
FT
Register 2
Register 1
Control Logic
5/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
G
CKE
CK
E3
E2
E1
BD
BC
BB
BA
W
LBO
ADV
A0–An
K
K
Data Coherency
Match
Read, Write and
K
Write Address
Write Address
K
K
D
Q
SA1
SA0
Burst
Counter
SA1’
SA0’
Write Drivers
Rev: 1.03b 2/2009
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Functional Details
Clocking
Deassertion of the Clock Enable (CKE) input blocks the Clock input from reaching the RAM's internal circuits. It may be used to
suspend RAM operations. Failure to observe Clock Enable set-up or hold requirements will result in erratic operation.
Pipeline Mode Read and Write Operations
All inputs (with the exception of Output Enable, Linear Burst Order and Sleep) are synchronized to rising clock edges. Single cycle
read and write operations must be initiated with the Advance/Load pin (ADV) held low, in order to load the new address. Device
activation is accomplished by asserting all three of the Chip Enable inputs (E1, E2 and E3). Deassertion of any one of the Enable
inputs will deactivate the device.
Function
W
BA
BB
BC
BD
Read
H
X
X
X
X
Write Byte “a”
L
L
H
H
H
Write Byte “b”
L
H
L
H
H
Write Byte “c”
L
H
H
L
H
Write Byte “d”
L
H
H
H
L
Write all Bytes
L
L
L
L
L
Write Abort/NOP
L
H
H
H
H
Read operation is initiated when the following conditions are satisfied at the rising edge of clock: CKE is asserted Low, all three
chip enables (E1, E2, and E3) are active, the write enable input signals W is deasserted high, and ADV is asserted low. The address
presented to the address inputs is latched in to address register and presented to the memory core and control logic. The control
logic determines that a read access is in progress and allows the requested data to propagate to the input of the output register. At
the next rising edge of clock the read data is allowed to propagate through the output register and onto the output pins.
Write operation occurs when the RAM is selected, CKE is active, and the Write input is sampled low at the rising edge of clock.
The Byte Write Enable inputs (BA, BB, BC, & BD) determine which bytes will be written. All or none may be activated. A write
cycle with no Byte Write inputs active is a no-op cycle. The pipelined NBT SRAM provides double late write functionality,
matching the write command versus data pipeline length (2 cycles) to the read command versus data pipeline length (2 cycles). At
the first rising edge of clock, Enable, Write, Byte Write(s), and Address are registered. The Data In associated with that address is
required at the third rising edge of clock.
Flow Through Mode Read and Write Operations
Operation of the RAM in Flow Through mode is very similar to operations in Pipeline mode. Activation of a Read Cycle and the
use of the Burst Address Counter is identical. In Flow Through mode the device may begin driving out new data immediately after
new address are clocked into the RAM, rather than holding new data until the following (second) clock edge. Therefore, in Flow
Through mode the read pipeline is one cycle shorter than in Pipeline mode.
Write operations are initiated in the same way, but differ in that the write pipeline is one cycle shorter as well, preserving the ability
to turn the bus from reads to writes without inserting any dead cycles. While the pipelined NBT RAMs implement a double late
write protocol, in Flow Through mode a single late write protocol mode is observed. Therefore, in Flow Through mode, address
and control are registered on the first rising edge of clock and data in is required at the data input pins at the second rising edge of
clock.
Rev: 1.03b 2/2009
6/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Synchronous Truth Table
Operation
Type Address CK CKE ADV W Bx E1 E2 E3 G ZZ
DQ
Notes
Read Cycle, Begin Burst
R
External
L-H
L
L
H
X
L
H
L
L
L
Q
Read Cycle, Continue Burst
B
Next
L-H
L
H
X
X
X
X
X
L
L
Q
1,10
NOP/Read, Begin Burst
R
External
L-H
L
L
H
X
L
H
L
H
L
High-Z
2
Dummy Read, Continue Burst
B
Next
L-H
L
H
X
X
X
X
X
H
L
High-Z
1,2,10
Write Cycle, Begin Burst
W
External
L-H
L
L
L
L
L
H
L
X
L
D
3
Write Abort, Begin Burst
D
None
L-H
L
L
L
H
L
H
L
X
L
High-Z
1
Write Cycle, Continue Burst
B
Next
L-H
L
H
X
L
X
X
X
X
L
D
1,3,10
Write Abort, Continue Burst
B
Next
L-H
L
H
X
H
X
X
X
X
L
High-Z 1,2,3,10
Deselect Cycle, Power Down
D
None
L-H
L
L
X
X
H
X
X
X
L
High-Z
Deselect Cycle, Power Down
D
None
L-H
L
L
X
X
X
X
H
X
L
High-Z
Deselect Cycle, Power Down
D
None
L-H
L
L
X
X
X
L
X
X
L
High-Z
Deselect Cycle, Continue
D
None
L-H
L
H
X
X
X
X
X
X
L
High-Z
None
X
X
X
X
X
X
X
X
X
H
High-Z
Current
L-H
H
X
X
X
X
X
X
X
L
-
Sleep Mode
Clock Edge Ignore, Stall
1
4
Notes:
1. Continue Burst cycles, whether read or write, use the same control inputs. A Deselect continue cycle can only be entered into if a Deselect cycle is executed first.
2. Dummy Read and Write abort can be considered NOPs because the SRAM performs no operation. A Write abort occurs when the W
pin is sampled low but no Byte Write pins are active so no write operation is performed.
3. G can be wired low to minimize the number of control signals provided to the SRAM. Output drivers will automatically turn off during
write cycles.
4. If CKE High occurs during a pipelined read cycle, the DQ bus will remain active (Low Z). If CKE High occurs during a write cycle, the bus
will remain in High Z.
5. X = Don’t Care; H = Logic High; L = Logic Low; Bx = High = All Byte Write signals are high; Bx = Low = One or more Byte/Write
signals are Low
6. All inputs, except G and ZZ must meet setup and hold times of rising clock edge.
7. Wait states can be inserted by setting CKE high.
8. This device contains circuitry that ensures all outputs are in High Z during power-up.
9. A 2-bit burst counter is incorporated.
10. The address counter is incriminated for all Burst continue cycles.
Rev: 1.03b 2/2009
7/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Pipeline and Flow Through Read Write Control State Diagram
D
B
Deselect
W
R
D
R
D
W
New Read
New Write
R
W
B
B
R
B
W
R
Burst Read
W
Burst Write
D
Key
B
D
Notes:
Input Command Code
1. The Hold command (CKE Low) is not
shown because it prevents any state change.
ƒ Transition
Current State (n)
2. W, R, B and D represent input command
codes ,as indicated in the Synchronous Truth Table.
Next State (n+1)
n
n+1
n+2
n+3
Clock (CK)
Command
ƒ
Current State
ƒ
ƒ
ƒ
Next State
Current State and Next State Definition for Pipeline and Flow Through Read/Write Control State Diagram
Rev: 1.03b 2/2009
8/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Pipeline Mode Data I/O State Diagram
Intermediate
B W
R B
Intermediate
R
High Z
(Data In)
D
Data Out
(Q Valid)
W
D
Intermediate
Intermediate
W
Intermediate
R
High Z
B
D
Intermediate
Key
Notes:
Input Command Code
1. The Hold command (CKE Low) is not
shown because it prevents any state change.
ƒ Transition
Current State (n)
Transition
Intermediate State (N+1)
n
Next State (n+2)
n+1
2. W, R, B, and D represent input command
codes as indicated in the Truth Tables.
n+2
n+3
Clock (CK)
Command
ƒ
ƒ
ƒ
Current State
Intermediate
State
Next State
ƒ
Current State and Next State Definition for Pipeline Mode Data I/O State Diagram
Rev: 1.03b 2/2009
9/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Flow Through Mode Data I/O State Diagram
B W
R B
R
High Z
(Data In)
Data Out
(Q Valid)
W
D
D
W
R
High Z
B
D
Key
Notes
Input Command Code
1. The Hold command (CKE Low) is not
shown because it prevents any state change.
ƒ Transition
Current State (n)
2. W, R, B and D represent input command
codes as indicated in the Truth Tables.
Next State (n+1)
n
n+1
n+2
n+3
Clock (CK)
Command
ƒ
Current State
ƒ
ƒ
ƒ
Next State
Current State and Next State Definition for: Pipeline and Flow Through Read Write Control State Diagram
Rev: 1.03b 2/2009
10/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Burst Cycles
Although NBT RAMs are designed to sustain 100% bus bandwidth by eliminating turnaround cycle when there is transition from
read to write, multiple back-to-back reads or writes may also be performed. NBT SRAMs provide an on-chip burst address
generator that can be utilized, if desired, to further simplify burst read or write implementations. The ADV control pin, when
driven high, commands the SRAM to advance the internal address counter and use the counter generated address to read or write
the SRAM. The starting address for the first cycle in a burst cycle series is loaded into the SRAM by driving the ADV pin low, into
Load mode.
Burst Order
The burst address counter wraps around to its initial state after four addresses (the loaded address and three more) have been
accessed. The burst sequence is determined by the state of the Linear Burst Order pin (LBO). When this pin is low, a linear burst
sequence is selected. When the RAM is installed with the LBO pin tied high, Interleaved burst sequence is selected. See the tables
below for details.
Mode Pin Functions
Mode Name
Pin Name
Burst Order Control
LBO
Output Register Control
FT
Power Down Control
ZZ
State
Function
L
Linear Burst
H
Interleaved Burst
L
Flow Through
H or NC
Pipeline
L or NC
Active
H
Standby, IDD = ISB
Note:
There is a pull-up device on the FT pin and a pull-down device on the ZZ pin, so this input pin can be unconnected and the chip will operate in
the default states as specified in the above table.
Burst Counter Sequences
Linear Burst Sequence
Interleaved Burst Sequence
A[1:0] A[1:0] A[1:0] A[1:0]
A[1:0] A[1:0] A[1:0] A[1:0]
1st address
00
01
10
11
1st address
00
01
10
11
2nd address
01
10
11
00
2nd address
01
00
11
10
3rd address
10
11
00
01
3rd address
10
11
00
01
4th address
11
00
01
10
4th address
11
10
01
00
Note:
The burst counter wraps to initial state on the 5th clock.
Note:
The burst counter wraps to initial state on the 5th clock.
BPR 1999.05.18
Rev: 1.03b 2/2009
11/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Sleep Mode
During normal operation, ZZ must be pulled low, either by the user or by it’s internal pull down resistor. When ZZ is pulled high,
the SRAM will enter a Power Sleep mode after 2 cycles. At this time, internal state of the SRAM is preserved. When ZZ returns to
low, the SRAM operates normally after 2 cycles of wake up time.
Sleep mode is a low current, power-down mode in which the device is deselected and current is reduced to ISB2. The duration of
Sleep mode is dictated by the length of time the ZZ is in a high state. After entering Sleep mode, all inputs except ZZ become
disabled and all outputs go to High-Z The ZZ pin is an asynchronous, active high input that causes the device to enter Sleep mode.
When the ZZ pin is driven high, ISB2 is guaranteed after the time tZZI is met. Because ZZ is an asynchronous input, pending
operations or operations in progress may not be properly completed if ZZ is asserted. Therefore, Sleep mode must not be initiated
until valid pending operations are completed. Similarly, when exiting Sleep mode during tZZR, only a deselect or read commands
may be applied while the SRAM is recovering from Sleep mode.
Sleep Mode Timing Diagram
tKH
tKC
tKL
CK
tZZR
tZZS
tZZH
ZZ
Designing for Compatibility
The GSI NBT SRAMs offer users a configurable selection between Flow Through mode and Pipeline mode via the FT signal
found on Pin 14. Not all vendors offer this option, however most mark Pin 14 as VDD or VDDQ on pipelined parts and VSS on flow
through parts. GSI NBT SRAMs are fully compatible with these sockets.
Rev: 1.03b 2/2009
12/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Absolute Maximum Ratings
(All voltages reference to VSS)
Symbol
Description
Value
Unit
VDD
Voltage on VDD Pins
–0.5 to 4.6
V
VDDQ
Voltage on VDDQ Pins
–0.5 to VDD
V
VI/O
Voltage on I/O Pins
–0.5 to VDDQ +0.5 ( 4.6 V max.)
V
VIN
Voltage on Other Input Pins
–0.5 to VDD +0.5 ( 4.6 V max.)
V
IIN
Input Current on Any Pin
+/–20
mA
IOUT
Output Current on Any I/O Pin
+/–20
mA
PD
Package Power Dissipation
1.5
W
TSTG
Storage Temperature
–55 to 125
o
TBIAS
Temperature Under Bias
–55 to 125
o
C
C
Note:
Permanent damage to the device may occur if the Absolute Maximum Ratings are exceeded. Operation should be restricted to Recommended
Operating Conditions. Exposure to conditions exceeding the Absolute Maximum Ratings, for an extended period of time, may affect reliability of
this component.
Power Supply Voltage Ranges (1.8 V/2.5 V Version)
Parameter
Symbol
Min.
Typ.
Max.
Unit
1.8 V Supply Voltage
VDD1
1.7
1.8
2.0
V
2.5 V Supply Voltage
VDD2
2.3
2.5
2.7
V
1.8 V VDDQ I/O Supply Voltage
VDDQ1
1.7
1.8
VDD
V
2.5 V VDDQ I/O Supply Voltage
VDDQ2
2.3
2.5
VDD
V
Notes
Notes:
1. The part numbers of Industrial Temperature Range versions end the character “I”. Unless otherwise noted, all performance specifications quoted are evaluated for worst case in the temperature range marked on the device.
2. Input Under/overshoot voltage must be –2 V > Vi < VDDn+2 V not to exceed 4.6 V maximum, with a pulse width not to exceed 20% tKC.
Rev: 1.03b 2/2009
13/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
VDDQ2 & VDDQ1 Range Logic Levels
Parameter
Symbol
Min.
Typ.
Max.
Unit
Notes
VDD Input High Voltage
VIH
0.6*VDD
—
VDD + 0.3
V
1
VDD Input Low Voltage
VIL
–0.3
—
0.3*VDD
V
1
Notes:
1. The part numbers of Industrial Temperature Range versions end the character “I”. Unless otherwise noted, all performance specifications quoted are evaluated for worst case in the temperature range marked on the device.
2. Input Under/overshoot voltage must be –2 V > Vi < VDDn+2 V not to exceed 4.6 V maximum, with a pulse width not to exceed 20% tKC.
Recommended Operating Temperatures
Parameter
Symbol
Min.
Typ.
Max.
Unit
Notes
Ambient Temperature (Commercial Range Versions)
TA
0
25
70
C
2
Ambient Temperature (Industrial Range Versions)
TA
–40
25
85
C
2
Notes:
1. The part numbers of Industrial Temperature Range versions end the character “I”. Unless otherwise noted, all performance specifications quoted are evaluated for worst case in the temperature range marked on the device.
2. Input Under/overshoot voltage must be –2 V > Vi < VDDn+2 V not to exceed 4.6 V maximum, with a pulse width not to exceed 20% tKC.
Undershoot Measurement and Timing
Overshoot Measurement and Timing
VIH
20% tKC
VDD + 2.0 V
VSS
50%
50%
VDD
VSS – 2.0 V
20% tKC
VIL
Capacitance
(TA = 25oC, f = 1 MHZ, VDD = 2.5 V)
Parameter
Symbol
Test conditions
Typ.
Max.
Unit
Input Capacitance
CIN
VIN = 0 V
8
10
pF
Input/Output Capacitance
CI/O
VOUT = 0 V
12
14
pF
Note:
These parameters are sample tested.
Rev: 1.03b 2/2009
14/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
AC Test Conditions
Parameter
Conditions
Input high level
VDD – 0.2 V
Input low level
0.2 V
Input slew rate
1 V/ns
Input reference level
VDD/2
Output reference level
VDDQ/2
Output load
Fig. 1
Figure 1
Output Load 1
DQ
30pF*
50
Notes:
1. Include scope and jig capacitance.
2. Test conditions as specified with output loading as shown in Fig. 1
unless otherwise noted.
3. Device is deselected as defined by the Truth Table.
VDDQ/2
* Distributed Test Jig Capacitance
DC Electrical Characteristics
Parameter
Symbol
Test Conditions
Min
Max
Input Leakage Current
(except mode pins)
IIL
VIN = 0 to VDD
–1 uA
1 uA
FT, ZZ Input Current
IIN
VDD  VIN  0 V
–100 uA
100 uA
Output Leakage Current
IOL
Output Disable, VOUT = 0 to VDD
–1 uA
1 uA
DC Output Characteristics (1.8 V/2.5 V Version)
Parameter
Symbol
Test Conditions
Min
Max
1.8 V Output High Voltage
VOH1
IOH = –4 mA, VDDQ = 1.7 V
VDDQ – 0.4 V
—
2.5 V Output High Voltage
VOH2
IOH = –8 mA, VDDQ = 2.375 V
1.7 V
—
1.8 V Output Low Voltage
VOL1
IOL = 4 mA
—
0.4 V
2.5 V Output Low Voltage
VOL2
IOL = 8 mA
—
0.4 V
Rev: 1.03b 2/2009
15/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Operating Currents
-250
Parameter
Test Conditions
Device Selected;
All other inputs
VIH or VIL
Output open
Operating
Current
Mode
(x32/
x36)
Pipeline
Flow
Through
Pipeline
(x18)
Standby
Current
ZZ VDD – 0.2 V
—
Deselect
Current
Device Deselected;
All other inputs
VIH or  VIL
—
-200
-167
Symbol
0
to
70°C
–40
to
85°C
0
to
70°C
–40
to
85°C
0
to
70°C
–40
to
85°C
IDD
360
50
380
50
310
40
330
40
270
35
290
35
mA
255
25
275
25
230
20
250
20
220
20
240
20
mA
315
25
335
25
270
20
290
20
240
20
260
20
mA
IDDQ
IDD
IDDQ
IDD
IDDQ
IDD
Unit
Flow
Through
IDDQ
230
15
250
15
205
15
225
15
195
15
215
15
mA
Pipeline
ISB
100
120
100
120
100
120
mA
Flow
Through
ISB
100
120
100
120
100
120
mA
Pipeline
IDD
140
155
130
146
125
140
mA
Flow
Through
IDD
125
140
120
135
120
135
mA
Notes:
1. IDD and IDDQ apply to any combination of VDD and VDDQ operation.
2. All parameters listed are worst case scenario.
Rev: 1.03b 2/2009
16/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
AC Electrical Characteristics
Pipeline
Flow Through
Parameter
Symbol
Clock Cycle Time
-250
-200
-167
Unit
Min
Max
Min
Max
Min
Max
tKC
4.0
—
5.0
—
6.0
—
ns
Clock to Output Valid
tKQ
—
3.0
—
3.0
—
3.4
ns
Clock to Output Invalid
tKQX
1.5
—
1.5
—
1.5
—
ns
Clock to Output in Low-Z
tLZ1
1.5
—
1.5
—
1.5
—
ns
Setup time
tS
1.5
—
1.5
—
1.5
—
ns
Hold time
tH
0.2
—
0.4
—
0.5
—
ns
Clock Cycle Time
tKC
6.5
—
7.5
—
8.0
—
ns
Clock to Output Valid
tKQ
—
6.5
—
7.5
—
8.0
ns
Clock to Output Invalid
tKQX
3.0
—
3.0
—
3.0
—
ns
Clock to Output in Low-Z
tLZ1
3.0
—
3.0
—
3.0
—
ns
Setup time
tS
1.5
—
1.5
—
1.5
—
ns
Hold time
tH
0.5
—
0.5
—
0.5
—
ns
Clock HIGH Time
tKH
1.3
—
1.3
—
1.3
—
ns
Clock LOW Time
tKL
1.7
—
1.7
—
1.7
—
ns
Clock to Output in
High-Z
tHZ1
1.5
2.5
1.5
3.0
1.5
3.0
ns
G to Output Valid
tOE
—
2.5
—
3.0
—
3.5
ns
G to output in Low-Z
tOLZ1
0
—
0
—
0
—
ns
G to output in High-Z
tOHZ1
—
2.5
—
3.0
—
3.0
ns
ZZ setup time
tZZS2
5
—
5
—
5
—
ns
ZZ hold time
tZZH2
1
—
1
—
1
—
ns
ZZ recovery
tZZR
20
—
20
—
20
—
ns
Notes:
1. These parameters are sampled and are not 100% tested.
2. ZZ is an asynchronous signal. However, in order to be recognized on any given clock cycle, ZZ must meet the specified setup and hold
times as specified above.
Rev: 1.03b 2/2009
17/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Pipeline Mode Timing (NBT)
Write A
Read B
Suspend
Read C
tKH
Write D
Write No-op
Read E
Deselect
tKC
tKL
CK
tH
tS
A
A
B
C
D
E
tH
tS
CKE
tH
tS
E*
tH
tS
ADV
tH
tS
W
tH
tH
tS
tS
Bn
tH
tLZ
tKQ
tS
DQ
Rev: 1.03b 2/2009
D(A)
Q(B)
Q(C)
D(D)
18/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
tHZ
tKQX
Q(E)
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Flow Through Mode Timing (NBT)
Write A
Write B
Write B+1
Read C
Cont
Read D
Write E
Read F
Write G
tKL
tKH
tKC
CK
tH
tS
CKE
tH
tS
E
tH
tS
ADV
tH
tS
W
tH
tS
Bn
tH
tS
A0–An
A
B
C
D
E
F
G
tKQ
tH
tKQ
tLZ
tS
DQ
D(A)
D(B)
D(B+1)
tKQX
tHZ
Q(C)
Q(D)
tLZ
D(E)
tKQX
Q(F)
D(G)
tOLZ
tOE
tOHZ
G
*Note: E = High(False) if E1 = 1 or E2 = 0 or E3 = 1
Rev: 1.03b 2/2009
19/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Description
A1
Standoff
0.05
0.10
0.15
A2
Body Thickness
1.35
1.40
1.45
b
Lead Width
0.20
0.30
0.40
c
Lead Thickness
0.09
—
0.20
D
Terminal Dimension
21.9
22.0
22.1
D1
Package Body
19.9
20.0
20.1
E
Terminal Dimension
15.9
16.0
16.1
E1
Package Body
13.9
14.0
14.1
e
Lead Pitch
—
0.65
—
L
Foot Length
0.45
0.60
0.75
L1
Lead Length
—
1.00
—
Y
Coplanarity

Lead Angle
e
D
D1
Symbol
Pin 1
TQFP Package Drawing (Package T)

L
c
L1
Min. Nom. Max
b
A1
A2
0.10
Y
0
—
7
E1
E
Notes:
1. All dimensions are in millimeters (mm).
2. Package width and length do not include mold protrusion.
Rev: 1.03b 2/2009
20/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
Ordering Information—GSI NBT Synchronous SRAM
Org
Part Number1
Type
Voltage
Option
Package
Speed2
(MHz/ns)
TA3
4M x 18
GS8640Z18T-250V
NBT
1.8 V or 2.5 V
TQFP
250/6.5
C
4M x 18
GS8640Z18T-200V
NBT
1.8 V or 2.5 V
TQFP
200/7.5
C
4M x 18
GS8640Z18T-167V
NBT
1.8 V or 2.5 V
TQFP
167/8
C
2M x 36
GS8640Z36T-250V
NBT
1.8 V or 2.5 V
TQFP
250/6.5
C
2M x 36
GS8640Z36T-200V
NBT
1.8 V or 2.5 V
TQFP
200/7.5
C
2M x 36
GS8640Z36T-167V
NBT
1.8 V or 2.5 V
TQFP
167/8
C
4M x 18
GS8640Z18T-250IV
NBT
1.8 V or 2.5 V
TQFP
250/6.5
I
4M x 18
GS8640Z18T-200IV
NBT
1.8 V or 2.5 V
TQFP
200/7.5
I
4M x 18
GS8640Z18T-167IV
NBT
1.8 V or 2.5 V
TQFP
167/8
I
2M x 36
GS8640Z36T-250IV
NBT
1.8 V or 2.5 V
TQFP
250/6.5
I
2M x 36
GS8640Z36T-200IV
NBT
1.8 V or 2.5 V
TQFP
200/7.5
I
2M x 36
GS8640Z36T-167IV
NBT
1.8 V or 2.5 V
TQFP
167/8
I
4M x 18
GS8640Z18GT-250V
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
250/6.5
C
4M x 18
GS8640Z18GT-200V
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
200/7.5
C
4M x 18
GS8640Z18GT-167V
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
167/8
C
2M x 36
GS8640Z36GT-250V
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
250/6.5
C
2M x 36
GS8640Z36GT-200V
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
200/7.5
C
2M x 36
GS8640Z36GT-167V
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
167/8
C
4M x 18
GS8640Z18GT-250IV
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
250/6.5
I
4M x 18
GS8640Z18GT-200IV
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
200/7.5
I
4M x 18
GS8640Z18GT-167IV
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
167/8
I
2M x 36
GS8640Z36GT-250IV
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
250/6.5
I
2M x 36
GS8640Z36GT-200IV
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
200/7.5
I
2M x 36
GS8640Z36GT-167IV
NBT
1.8 V or 2.5 V
RoHS-compliant TQFP
167/8
I
Notes:
1. Customers requiring delivery in Tape and Reel should add the character “T” to the end of the part number. Example: GS8640Z36T-167IVT.
2. The speed column indicates the cycle frequency (MHz) of the device in Pipeline mode and the latency (ns) in Flow Through mode. Each
device is Pipeline/Flow Through mode-selectable by the user.
3. TA = C = Commercial Temperature Range. TA = I = Industrial Temperature Range.
GSI offers other versions this type of device in many different configurations and with a variety of different features, only some of which are
covered in this data sheet. See the GSI Technology web site (www.gsitechnology.com) for a complete listing of current offerings
Rev: 1.03b 2/2009
21/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
GS8640Z18/36T-xxxV
72Mb Sync SRAM Datasheet Revision History
DS/DateRev. Code: Old;
New
Types of Changes
Format or Content
Page;Revisions;Reason
• Creation of new datasheet
8640ZVxx_r1
8640ZVxx_r1;
8640Zxx_V_r_01
Content
• Updated entire document to reflect new part nomenclature
• Removed 300 MHz speed bin
• Changed pin 16 from VDD to NC
• (Rev1.01a: Corrected configurations in pinout diagrams)
8640Zxx_V_r1_01;
8640Zxx_V_r_02
Content
• Changed 167 MHz tKQ to 3.4 ns (pg. 1, 17)
• Added note to TQFP pinouts (pg. 2, 3)
Content
• Updated Synchronous Truth Table (pg. 7); Removed Status column
from Ordering Information table
• (Rev1.03a: Corrected erroneous timing diagrams)
• Rev1.03b: Removed “Preliminary” banner due to MP status
8640Zxx_V_r1_02;
8640Zxx_V_r_03
Rev: 1.03b 2/2009
22/22
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2004, GSI Technology
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