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GS8644Z18(B/E)/GS8644Z36(B/E)/GS8644Z72(C)
119-, 165-, & 209-Pin BGA
Commercial Temp
Industrial Temp
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
• 2.5 V or 3.3 V +10%/–10% core power supply
• 2.5 V or 3.3 V I/O supply
• User-configurable Pipeline and Flow Through mode
• ZQ mode pin for user-selectable high/low output drive
• IEEE 1149.1 JTAG-compatible Boundary Scan
• LBO pin for Linear or Interleave Burst mode
• Pin-compatible with 2Mb, 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 119-, 165- or 209-bump BGA package
72Mb Pipelined and Flow Through
Synchronous NBT SRAM
250 MHz–133MHz
2.5 V or 3.3 V V
DD
2.5 V or 3.3 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 off-
chip write pulse generation required by asynchronous SRAMs
and simplifies input signal timing.
The GS8644Z18/36/72 may be configured by the user to
operate in Pipeline or Flow Through mode. Operating as a
pipelined synchronous device, 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 GS8644Z18/36/72 is implemented with GSI's high
performance CMOS technology and is available in a JEDEC-
standard 119-bump, 165-bump or 209-bump BGA package.
Functional Description
The GS8644Z18/36/72 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.
Parameter Synopsis
t
KQ(x18/x36)
t
KQ(x72)
tCycle
Curr
(x18)
Curr
(x36)
Curr
(x72)
t
KQ
tCycle
Curr
(x18)
Curr
(x36)
Curr
(x72)
-250 -225 -200
2.5 2.7 3.0
3.0 3.0 3.0
4.0 4.4 5.0
385
450
540
6.5
6.5
265
290
345
-166
3.5
3.5
6.0
-150
3.8
3.8
6.7
-133 Unit
4.0 ns
4.0 ns
7.5 ns
Pipeline
3-1-1-1
Flow
Through
2-1-1-1
360 335 305 295 265 mA
415 385 345 325 295 mA
505 460 405 385 345 mA
6.5 6.5 7.0 7.5 8.5 ns
6.5 6.5 7.0 7.5 8.5 ns
265 265 255 240 225 mA
290 290 280 265 245 mA
345 345 335 315 300 mA
Rev: 1.03 11/2004
1/39
© 2003, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Product Preview
GS8644Z18(B/E)/GS8644Z36(B/E)/GS8644Z72(C)
GS8644Z72 209-Bump BGA Pin Description
Symbol
A
0
, A
1
A
DQ
A
DQ
B
DQ
C
DQ
D
DQ
E
DQ
F
DQ
G
DQ
H
B
A
, B
B
B
C
,B
D
B
E
, B
F
, B
G
,B
H
NC
CK
E
1
E
3
E
2
G
ADV
ZZ
FT
LBO
MCH
MCH
MCL
W
ZQ
CKE
I
I
I
Type
I
I
Description
Address field LSBs and Address Counter Preset Inputs.
Address Inputs
I/O
Data Input and Output pins
I
I
I
—
I
I
I
I
I
I
I
I
I
I
I
Byte Write Enable for DQ
A
, DQ
B
I/Os; active low
Byte Write Enable for DQ
C
, DQ
D
I/Os; active low
Byte Write Enable for DQ
E
, DQ
F
, DQ
G
, DQ
H
I/Os; active low
No Connect
Clock Input Signal; active high
Chip Enable; active low
Chip Enable; active low
Chip Enable; active high
Output Enable; active low
Burst address counter advance enable
Sleep Mode control; active high
Flow Through or Pipeline mode; active low
Linear Burst Order mode; active low
Must Connect High
Must Connect High
Must Connect Low
Write Enable; active low
FLXDrive Output Impedance Control
Low = Low Impedance [High Drive],
High = High Impedance [Low Drive]
Clock Enable; active low
Rev: 1.03 11/2004
3/39
© 2003, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
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