GS881E18B(T/D)/GS881E32B(T/D)/GS881E36B(T/D)
100-Pin TQFP & 165-bump BGA
Commercial Temp
Industrial Temp
512K x 18, 256K x 32, 256K x 36
9Mb Sync Burst SRAMs
250 MHz–133 MHz
2.5 V or 3.3 V V
DD
2.5 V or 3.3 V I/O
Features
• FT pin for user-configurable flow through or pipeline opera-
tion
• Dual Cycle Deselect (DCD) operation
• IEEE 1149.1 JTAG-compatible Boundary Scan
• 2.5 V or 3.3 V +10%/–10% core power supply
• 2.5 V or 3.3 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 and 165-bump BGA
packages
Pipeline
3-1-1-1
3.3 V
2.5 V
Flow
Through
2-1-1-1
3.3 V
2.5 V
t
KQ
tCycle
Curr
(x18)
Curr
(x32/x36)
Curr
(x18)
Curr
(x32/x36)
t
KQ
tCycle
Curr
(x18)
Curr
(x32/x36)
Curr
(x18)
Curr
(x32/x36)
-250 -225 -200 -166 -150 -133 Unit
2.5 2.7 3.0 3.4 3.8 4.0 ns
4.0 4.4 5.0 6.0 6.7 7.5 ns
280
330
275
320
5.5
5.5
175
200
175
200
255
300
250
295
6.0
6.0
165
190
165
190
230
270
230
265
6.5
6.5
160
180
160
180
200
230
195
225
7.0
7.0
150
170
150
170
185
215
180
210
7.5
7.5
145
165
145
165
165
190
165
185
8.5
8.5
135
150
135
150
mA
mA
mA
mA
ns
ns
mA
mA
mA
mA
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 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.
DCD Pipelined Reads
The GS881E18B(T/D)/GS881E32B(T/D)/GS881E36B(T/D)
is a DCD (Dual Cycle Deselect) pipelined synchronous
SRAM. SCD (Single Cycle Deselect) versions are also
available. DCD SRAMs pipeline disable commands to the
same degree as read commands. DCD RAMs hold the deselect
command for one full cycle and then begin turning off their
outputs just after the second rising edge of clock.
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.
Functional Description
Applications
The GS881E18B(T/D)/GS881E32B(T/D)/GS881E36B(T/D)
is a 9,437,184-bit 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.
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 GS881E18B(T/D)/GS881E32B(T/D)/GS881E36B(T/D)
operates on a 2.5 V or 3.3 V power supply. All input are 3.3 V
and 2.5 V compatible. Separate output power (V
DDQ
) pins are
used to decouple output noise from the internal circuits and are
3.3 V and 2.5 V compatible.
Controls
Addresses, data I/Os, chip enable (E1), address burst control
inputs (ADSP, ADSC, ADV) and write control inputs (Bx, BW,
GW) are synchronous and are controlled by a positive-edge-
Rev: 1.01 8/2003
1/36
© 2002, Giga Semiconductor, Inc.
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
ByteSafe is a Trademark of Giga Semiconductor, Inc. (GSI Technology).
GS881E18B(T/D)/GS881E32B(T/D)/GS881E36B(T/D)
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
NC
CK
GW
E
2
E
1
G
ADV
ADSP, ADSC
ZZ
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
Description
Address field LSBs and Address Counter preset Inputs
Address Inputs
Data Input and Output pins
No Connect
Byte Write—Writes all enabled bytes; active low
Byte Write Enable for DQ Data I/Os; active low
No Connect
Clock Input Signal; active high
Global Write Enable—Writes all bytes; active low
Chip Enable; active high
Chip Enable; active low
Output Enable; active low
Burst address counter advance enable; active low
Address Strobe (Processor, Cache Controller); active low
Sleep Mode control; active high
Linear Burst Order mode; active low
Core power supply
I/O and Core Ground
Output driver power supply
Rev: 1.01 8/2003
5/36
© 2002, Giga Semiconductor, Inc.
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
京公网安备 11010802033920号
EEWORLD
