GS88018/32/36BT-xxxV
100-Pin TQFP
Commercial Temp
Industrial Temp
Features
• FT pin for user-configurable flow through or pipeline
operation
• Single Cycle Deselect (SCD) operation
• 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 Interleaved Burst mode
• Internal input resistors on mode pins allow floating mode pins
• Default to Interleaved Pipeline mode
• Byte Write (BW) and/or Global Write (GW) operation
• Internal self-timed write cycle
• Automatic power-down for portable applications
• JEDEC-standard 100-lead TQFP package
• RoHS-compliant 100-lead TQFP package available
512K x 18, 256K x 32, 256K x 36
9Mb Sync Burst SRAMs
250 MHz–150 MHz
1.8 V or 2.5 V V
DD
1.8 V or 2.5 V I/O
interleave order with the Linear Burst Order (LBO) input. The
Burst function need not be used. New addresses can be loaded
on every cycle with no degradation of chip performance.
Flow Through/Pipeline Reads
The function of the Data Output register can be controlled by
the user via the FT mode pin (Pin 14). Holding the FT mode
pin low places the RAM in Flow Through mode, causing
output data to bypass the Data Output Register. Holding FT
high places the RAM in Pipeline mode, activating the rising-
edge-triggered Data Output Register.
SCD Pipelined Reads
The GS88018/32/36BT-xxxV is a SCD (Single Cycle
Deselect) pipelined synchronous SRAM. DCD (Dual Cycle
Deselect) versions are also available. SCD SRAMs pipeline
deselect commands one stage less than read commands. SCD
RAMs begin turning off their outputs immediately after the
deselect command has been captured in the input registers.
Functional Description
Applications
The GS88018/32/36BT-xxxV is a 9,437,184-bit (8,388,608-bit
for x32 version) high performance synchronous SRAM with a
2-bit burst address counter. Although of a type originally
developed for Level 2 Cache applications supporting high
performance CPUs, the device now finds application in
synchronous SRAM applications, ranging from DSP main
store to networking chip set support.
Controls
Addresses, data I/Os, chip enables (E1, E2, E3), address burst
control inputs (ADSP, ADSC, ADV), and write control inputs
(Bx, BW, GW) are synchronous and are controlled by a
positive-edge-triggered clock input (CK). Output enable (G)
and power down control (ZZ) are asynchronous inputs. Burst
cycles can be initiated with either ADSP or ADSC inputs. In
Burst mode, subsequent burst addresses are generated
internally and are controlled by ADV. The burst address
counter may be configured to count in either linear or
en
de
om
m
N
ot
R
ec
Parameter Synopsis
-250
Pipeline
3-1-1-1
t
KQ
tCycle
Curr (x18)
Curr (x32/x36)
t
KQ
tCycle
Curr (x18)
Curr (x32/x36)
3.0
4.0
195
220
5.5
5.5
155
175
d
fo
r
Byte Write and Global Write
Byte write operation is performed by using Byte Write enable
(BW) input combined with one or more individual byte write
signals (Bx). In addition, Global Write (GW) is available for
writing all bytes at one time, regardless of the Byte Write
control inputs.
Sleep Mode
Low power (Sleep mode) is attained through the assertion
(High) of the ZZ signal, or by stopping the clock (CK).
Memory data is retained during Sleep mode.
Core and Interface Voltages
The GS88018/32/36BT-xxxV operates on a 1.8 V or 2.5 V
power supply. All input are 1.8 V or 2.5 V compatible.
Separate output power (V
DDQ
) pins are used to decouple
output noise from the internal circuits and are 1.8 V or 2.5 V
compatible.
N
-200
3.0
5.0
165
185
6.5
6.5
140
155
ew
-150
3.8
6.7
140
160
7.5
7.5
128
145
Flow Through
2-1-1-1
Rev: 1.04 6/2007
1/22
D
ns
ns
mA
mA
ns
ns
mA
mA
es
Unit
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
ig
n
© 2004, GSI Technology
GS88018/32/36BT-xxxV
TQFP Pin Description
Symbol
A
0
, A
1
A
DQ
A
DQ
B
DQ
C
DQ
D
NC
BW
B
A
, B
B,
B
C
, B
D
CK
GW
E
1
, E
3
E
2
G
ADV
ADSP, ADSC
ZZ
FT
LBO
V
DD
V
SS
V
DDQ
Type
I
I
I/O
—
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Description
Address field LSBs and Address Counter preset Inputs
Address Inputs
Data Input and Output pin
No Connect
Byte Write—Writes all enabled bytes; active low
Clock Input Signal; active high
Chip Enable; active low
Chip Enable; active high
Global Write Enable—Writes all bytes; active low
Address Strobe (Processor, Cache Controller); active low
Sleep Mode control; active high
de
d
en
m
Rev: 1.04 6/2007
N
ot
R
ec
om
5/22
fo
r
Burst address counter advance enable; active low
Flow Through or Pipeline mode; active low
Linear Burst Order mode; active low
Core power supply
I/O and Core Ground
Output driver power supply
N
Output Enable; active low
ew
D
es
Byte Write Enable for DQ
A
, DQ
B
Data I/Os; active low
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
ig
n
© 2004, GSI Technology
Analog electronics
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