
Rev: 1.01  11/2000
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
NoBL is a trademark of Cypress Semiconductor Corp.. NtRAM is a trademark of Samsung Electronics Co.. ZBT is a trademark of Integrated Device Technology, Inc.
1/39
 2000, Giga Semiconductor, Inc.
Preliminary
GS8152Z18/36/72B-225/200/180/166/150/133
16Mb Pipelined and Flow Through 
Synchronous NBT SRAM
225MHz
–
133MHz
3.3 V V
DD
2.5 V or 3.3 V I/O
119 and 209 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
 3.3 V +10%/–5% 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
 On-chip write parity checking; even or odd selectable
 On-chip parity encoding and error detection
 LBO pin for Linear or Interleave Burst mode
 Pin-compatible with 2M, 4M, and 8M devices
 Byte write operation (9-bit Bytes)
 3 chip enable signals for easy depth expansion
 ZZ Pin for automatic power-down
 JEDEC-standard 119- or 209-Bump BGA  package
Functional Description
The GS8152Z18/36/72B is a 16Mbit 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. 
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 GS8152Z18/36/72B  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 GS8152Z18/36/72B is implemented with GSI's high 
performance CMOS technology and is available in a JEDEC-
Standard 119-bump (x18 & x36) or 209-bump (x72) BGA 
package. 
-225 -200 -180 -166 -150 -133 Unit
7.0
8.5
205
240
325
285
285
285
2.5
4.4
350
410
570
515
470
435
Flow 
Through
2-1-1-1
t
KQ
tCycle
Curr (x18)
Curr (x36)
Curr (x72)
t
KQ
tCycle
Curr (x18)
Curr (x36)
Curr (x72)
7.5
10.0
185
210
8.0
10.0
185
210
8.5
10.0
185
210
10.0
10.0
185
210
285
3.8
6.7
250
290
400
11.0
15.0
140
160
205
4.0
7.5
230
260
360
ns
ns
mA
mA
mA
ns
ns
mA
mA
mA
Pipeline
3-1-1-1
3.0
5.0
315
370
3.2
5.5
290
340
3.5
6.0
270
315
A
B
C
D
E
F
R
W
R
W
R
W
Q
A
D
B
Q
C
D
D
Q
E
Q
A
D
B
Q
C
D
D
Q
E
Clock
Address
Read/Write
Flow Through
Data I/O
Pipelined
Data I/O
Flow Through and Pipelined NBT SRAM Back-to-Back Read/Write Cycles