Preliminary
GS8161ZxxD(GT/D)-xxxV
100-Pin TQFP & 165-Bump BGA
Commercial Temp
Industrial Temp
18Mb Pipelined and Flow Through
Synchronous NBT SRAM
333 MHz–150 MHz
1.8 V or 2.5 V V
DD
1.8 V or 2.5 V I/O
Features
• User-configurable Pipeline and Flow Through mode
• 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
• IEEE 1149.1 JTAG-compatible Boundary Scan
• 1.8 V or 2.5 V core power supply
• 1.8 V or 2.5 V I/O supply
• LBO pin for Linear or Interleave Burst mode
• Pin-compatible with 2Mb, 4Mb, 8Mb, 36Mb, 72Mb and
144Mb devices
• Byte write operation (9-bit Bytes)
• 3 chip enable signals for easy depth expansion
• ZZ pin for automatic power-down
• JEDEC-standard 165-bump BGA package
• RoHS-compliant 100-pin TQFP and BGA packages available
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 GS8161ZxxD(GT/D)-xxxV 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 GS8161ZxxD(GT/D)-xxxV is implemented with GSI's
high performance CMOS technology and is available in
JEDEC-standard 165-bump FP-BGA package.
Functional Description
The GS8161ZxxD(GT/D)-xxxV is an 18Mbit 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
tCycle
Curr
(x18)
Curr
(x36)
t
KQ
tCycle
Curr
(x18)
Curr
(x36)
-333
3.0
3.0
TBD
TBD
5.0
5.0
TBD
TBD
-250
3.0
4.0
TBD
TBD
5.5
5.5
TBD
TBD
-200
3.0
5.0
TBD
TBD
6.5
6.5
TBD
TBD
-150
3.8
6.7
TBD
TBD
7.5
7.5
TBD
TBD
Unit
ns
ns
mA
mA
ns
ns
mA
mA
Pipeline
3-1-1-1
Flow
Through
2-1-1-1
Rev: 1.00 6/2011
1/35
© 2011, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Preliminary
GS8161ZxxD(GT/D)-xxxV
100-Pin TQFP Pin Descriptions
Symbol
A
0
, A
1
A
CK
B
A
B
B
B
C
B
D
W
E
1
E
2
E
3
G
ADV
CKE
NC
DQ
A
DQ
B
DQ
C
DQ
D
ZZ
FT
LBO
MCH
V
DD
V
SS
V
DDQ
Type
In
In
In
In
In
In
In
In
In
In
In
In
In
In
—
I/O
I/O
I/O
I/O
In
In
In
—
In
In
In
Description
Burst Address Inputs; Preload the burst counter
Address Inputs
Clock Input Signal
Byte Write signal for data inputs DQ
A1
–DQ
A9
; active low
Byte Write signal for data inputs DQ
B1
–DQ
B9
; active low
Byte Write signal for data inputs DQ
C1
–DQ
C9
; active low
Byte Write signal for data inputs DQ
D1
–DQ
D9
; active low
Write Enable; active low
Chip Enable; active low
Chip Enable—Active High. For self decoded depth expansion
Chip Enable—Active Low. For self decoded depth expansion
Output Enable; active low
Advance/Load; Burst address counter control pin
Clock Input Buffer Enable; active low
No Connect
Byte A Data Input and Output pins
Byte B Data Input and Output pins
Byte C Data Input and Output pins
Byte D Data Input and Output pins
Power down control; active high
Pipeline/Flow Through Mode Control; active low
Linear Burst Order; active low.
Must Connect High (165 BGA only)
Core power supply
Ground
Output driver power supply
Rev: 1.00 6/2011
4/35
© 2011, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
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