GS8256418/36(GB/GD)-xxxV
119- & 165-Bump BGA
Commercial Temp
Industrial Temp
333 MHz–200 MHz
16M x 18, 8M x 36
288Mb DCD Sync Burst SRAMs
1.8 V or 2.5 V V
DD
1.8 V or 2.5 V I/O
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.
Features
• FT pin for user-configurable flow through or pipeline operation
• Single/Dual Cycle Deselect selectable
• IEEE 1149.1 JTAG-compatible Boundary Scan
• ZQ mode pin for user-selectable high/low output drive
• 1.8 V +10%/–10% core power supply
• 2.5 V +10%/–10% 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
• Byte Write (BW) and/or Global Write (GW) operation
• Internal self-timed write cycle
• ZZ pin for automatic power-down
• RoHS-compliant 119-bump and 165-bump BGA packages
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
Data Output Register. Holding FT high places the RAM in
Pipeline mode, activating the rising-edge-triggered Data Output
Register.
DCD Pipelined Reads
The GS8256418/36-xxxV is a DCD (Dual Cycle Deselect)
pipelined synchronous SRAM. 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.
Functional Description
Applications
The GS8256418/36-xxxV is a 301,989,888-bit high performance
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.
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
FLXDrive™
Addresses, data I/Os, chip enable (E1), address burst control
The ZQ pin allows selection between high drive strength (ZQ low)
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
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.
Core and Interface Voltages
The GS8256418/36-xxxV operates on a 1.8 V or 2.5 V power
supply. All input are 31.8 V or 2.5 V compatible. Separate output
Parameter Synopsis
-333
2.5
3.0
-250
-200
Unit
tKQ
2.5
4.0
3.0
5.0
ns
ns
tCycle
Pipeline
3-1-1-1
Curr (x18)
Curr (x36)
630
690
520
570
450
490
mA
mA
tKQ
tCycle
4.5
4.5
5.5
5.5
6.5
6.5
ns
ns
Flow Through
2-1-1-1
Curr (x18)
Curr (x36)
490
530
430
470
400
440
mA
mA
Rev: 1.03 5/2017
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© 2015, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.