GS8161Z18D(GT/D)/GS8161Z32D(D)/GS8161Z36D(GT/D)
400 MHz–150 MHz
100-Pin TQFP & 165-Bump BGA
Commercial Temp
Industrial Temp
18Mb Pipelined and Flow Through
Synchronous NBT SRAM
1.8 V, 2.5 V, or 3.3 V V
DD
1.8 V, 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.
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, 2.5 V, or 3.3 V +10%/–10% core power 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 165-bump BGA
packages available
The GS8161Z18D(GT/D)/GS8161Z32D(D)/
GS8161Z36D(GT/D) 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.
Functional Description
The GS8161Z18D(GT/D)/GS8161Z32D(D)/
GS8161Z36D(GT/D) 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.
The GS8161Z18D(GT/D)/GS8161Z32D(D)/
GS8161Z36D(GT/D) is implemented with GSI's high
performance CMOS technology and is available in JEDEC-
standard 165-bump BGA package.
Parameter Synopsis
-400
-375
-333
-250
-200
-150
Unit
t
2.5
2.5
2.5
2.66
2.5
3.3
2.5
4.0
3.0
5.0
3.8
6.7
ns
ns
KQ
Pipeline
3-1-1-1
tCycle
Curr (x18)
Curr (x32/x36)
370
430
350
410
310
365
250
290
210
240
185
200
mA
mA
t
4.0
4.0
4.2
4.2
4.5
4.5
5.5
5.5
6.5
6.5
7.5
7.5
ns
ns
KQ
Flow
Through
2-1-1-1
tCycle
Curr (x18)
Curr (x32/x36)
275
315
265
300
255
285
220
250
205
225
190
205
mA
mA
Rev: 1.03b 9/2013
1/40
© 2011, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.