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GS816236D-200 датащи(PDF) 1 Page - GSI Technology

номер детали GS816236D-200
подробное описание детали  1M x 18, 512K x 36, 256K x 72 18Mb Sync Burst SRAMs
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производитель  GSI [GSI Technology]
домашняя страница  http://www.gsitechnology.com
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GS816236D-200 датащи(HTML) 1 Page - GSI Technology

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GS816218(B/D)/GS816236(B/D)/GS816272(C)
1M x 18, 512K x 36, 256K x 72
18Mb Sync Burst SRAMs
250 MHz–133 MHz
2.5 V or 3.3 V VDD
2.5 V or 3.3 V I/O
119-, 165-, & 209-Bump BGA
Commercial Temp
Industrial Temp
Rev: 2.17 11/2004
1/41
© 1999, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
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
• 2.5 V or 3.3 V +10%/–10% core power 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-, 165-, and 209-bump BGA package
Functional Description
Applications
The GS816218(B/D)/GS816236(B/D)/GS816272(C) is an
18,874,368-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.
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.
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.
SCD and DCD Pipelined Reads
The GS816218(B/D)/GS816236(B/D)/GS816272(C) 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.
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.
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.
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 GS816218(B/D)/GS816236(B/D)/GS816272(C) 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 (VDDQ) pins are used to
decouple output noise from the internal circuits and are 3.3 V and
2.5 V compatible.
Parameter Synopsis
-250
-225
-200
-166
-150
-133
Unit
Pipeline
3-1-1-1
tKQ
tCycle
2.5
4.0
2.7
4.4
3.0
5.0
3.4
6.0
3.8
6.7
4.0
7.5
ns
ns
3.3 V
Curr (x18)
Curr (x36)
Curr (x72)
280
330
n/a
255
300
n/a
230
270
350
200
230
300
185
215
270
165
190
245
mA
mA
mA
Flow Through
2-1-1-1
tKQ
tCycle
5.5
5.5
6.0
6.0
6.5
6.5
7.0
7.0
7.5
7.5
8.5
8.5
ns
ns
3.3 V
Curr (x18)
Curr (x36)
Curr (x72)
175
200
n/a
165
190
n/a
160
180
225
150
170
115
145
165
210
135
150
185
mA
mA
mA


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