GS88218/36C(B/D)-xxxV
250 MHz–150 MHz
512K x 18, 256K x 36
9Mb SCD/DCD Sync Burst SRAMs
119- and 165-Bump BGA
Commercial Temp
1.8 V or 2.5 V V
DD
1.8 V or 2.5 V I/O
Data Output Register. Holding FT high places the RAM in
Pipeline mode, activating the rising-edge-triggered Data Output
Register.
Features
• FT pin for user-configurable flow through or pipeline operation
• Single/Dual Cycle Deselect selectable
• IEEE 1149.1 JTAG-compatible Boundary Scan
• On-chip read parity checking; even or odd selectable
• ZQ mode pin for user-selectable high/low output drive
• 1.8 V or 2.5 V core power supply
SCD and DCD Pipelined Reads
The GS88218/36C(B/D)-xxxV is a SCD (Single Cycle
Deselect) and DCD (Dual Cycle Deselect) pipelined
synchronous SRAM. DCD SRAMs pipeline disable commands
to the same degree as read commands. 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.
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. The user may configure this SRAM for either
mode of operation using the SCD mode input.
• 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 SCD x18/x36 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 119- and 165-bump BGA packages
• RoHS-compliant packages available
Byte Write and Global Write
Functional Description
Applications
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.
The GS88218C(B/D)-xxxV 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.
FLXDrive™
The ZQ pin allows selection between high drive strength (ZQ
low) for multi-drop bus applications and normal drive strength
(ZQ floating or high) point-to-point applications. See the
Output Driver Characteristics chart for details.
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-
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.
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 GS88218/36C(B/D)-xxxV operates on a 1.8 V or 2.5 V
power supply. All input are 2.5 V and 1.8 V compatible.
Separate output power (V
) pins are used to decouple
DDQ
output noise from the internal circuits and are 2.5 V and 1.8 V
compatible.
Flow Through/Pipeline Reads
The function of the Data Output register can be controlled by the
user via the FT mode . Holding the FT mode pin low places the
RAM in Flow Through mode, causing output data to bypass the
Parameter Synopsis
-250
-200
-150
Unit
tKQ
3.0
4.0
3.0
5.0
3.8
6.7
ns
ns
tCycle
Pipeline
3-1-1-1
Curr (x18)
Curr (x32/x36)
175
200
150
165
125
145
mA
mA
tKQ
5.5
5.5
6.5
6.5
7.5
7.5
ns
ns
tCycle
Flow Through
2-1-1-1
Curr (x18)
Curr (x32/x36)
135
155
125
140
113
125
mA
mA
Rev: 1.05 6/2012
1/34
© 2011, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
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