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PDF CG6257AM Data sheet ( Hoja de datos )

Número de pieza CG6257AM
Descripción 4Mb (256K x 16) Pseudo Static RAM
Fabricantes Weida Semiconductor 
Logotipo Weida Semiconductor Logotipo



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No Preview Available ! CG6257AM Hoja de datos, Descripción, Manual

PRELIMINARY
CG6257AM
4Mb (256K x 16) Pseudo Static RAM
Features
• Wide voltage range: 2.70V–3.30V
• Access Time: 70ns
• Ultra-low active power
— Typical active current: 2.0mA @ f = 1 MHz
— Typical active current: 13mA @ f = fmax
• Ultra low standby power
• Automatic power-down when deselected
• CMOS for optimum speed/power
• Offered in a 48 Ball BGA Package
Functional Description[1]
The CG6257AM is a high-performance CMOS Pseudo static
RAM organized as 256K words by 16 bits that supports an
asynchronous memory interface. This device features
advanced circuit design to provide ultra-low active current.
This is ideal for providing More Battery Life® (MoBL) in
portable applications such as cellular telephones. The device
can be put into standby mode reducing power consumption by
more than 99% The device can also be put into standby mode
when deselected (CE HIGH or both BHE and BLE are HIGH).
The input/output pins (I/O0 through I/O15) are placed in a
high-impedance state when: deselected (CE HIGH ), outputs
are disabled (OE HIGH), both Byte High Enable and Byte Low
Enable are disabled (BHE, BLE HIGH), or during a write
operation (CE LOW and WE LOW). The addresses must not
be toggled once the read is started on the device.
Writing to the device is accomplished by taking Chip Enables
(CE LOW ) and Write Enable (WE) input LOW. If Byte Low
Enable (BLE) is LOW, then data from I/O pins (I/O0 through
I/O7), is written into the location specified on the address pins
(A0 through A17). If Byte High Enable (BHE) is LOW, then data
from I/O pins (I/O8 through I/O15) is written into the location
specified on the address pins (A0 through A17).
Reading from the device is accomplished by taking Chip
Enables (CE LOW) and Output Enable (OE) LOW while
forcing the Write Enable (WE) HIGH. If Byte Low Enable (BLE)
is LOW, then data from the memory location specified by the
address pins will appear on I/O0 to I/O7. If Byte High Enable
(BHE) is LOW, then data from memory will appear on I/O8 to
I/O15. See the truth table at the back of this datasheet for a
complete description of read and write modes
Logic Block Diagram
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A10
A9
A
A
8
7
A6
A5
A4
A3
A2
A
A
1
0
DATA IN DRIVERS
256K × 16
RAM Array
I/O0 – I/O7
I/O8 – I/O15
COLUMN DECODER
Power- Down
Circuit
BHE
BLE
BHE
WE
OE
BLE
CE
CE
Note:
1. For best-practice recommendations, please refer to the Cypress application note “System Design Guidelines” on http://www.cypress.com.
Weida Semiconductor, Inc.
38-XXXXX
Revised August 2003

1 page




CG6257AM pdf
PRELIMINARY
CG6257AM
AC Test Loads and Waveforms
VCC
OUTPUT
R1
50 pF
INCLUDING
JIG AND
SCOPE
R2
VCC
10%
GND
Rise Time = 1 V/ns
ALL INPUT PULSES
90%
90%
10%
Fall Time = 1 V/ns
Equivalento:
THÉVENINEQUIVALENT
OUTPUT
RTH
V
Parameters
R1
R2
RTH
VTH
3.0V VCC
1179
1941
733
1.87
Unit
V
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38-XXXXX
Page - 5 - of 12

5 Page





CG6257AM arduino
Package
PRELIMINARY
CG6257AM
TOP VIEW
A1 CORNER
12 3 456
A
B
C
D
E
F
G
H
48-Ball (6 mm x 8mm x 1.2 mm) FBGA BA48K
BOTTOM VIEW
Ø0.05 M C
Ø0.25 M C A B
Ø0.30±0.05(48X)
A1 CORNER
6 5 4321
A
B
C
D
E
F
G
H
A
B
6.00±0.10
SEATING PLANE
www.DataSheet4U.com C
A 1.875
0.75
B
0.15(4X)
3.75
6.00±0.10
REFERENCE JEDEC MO-207
51-85193-*A
MoBL and More Battery Life are trademarks of Cypress Semiconductor Corporation. All product and company names mentioned
in this document may be the trademarks of their respective holders
38-XXXXX
Page - 11 - of 12
© Weida Semiconductor, Inc., 2002. The information contained herein is subject to change without notice. Weida Semiconductor assumes no responsibility for the use of any circuitry other than
circuitry embodied in a Weida Semiconductor product. Nor does it convey or imply any license under patent or other rights. Weida Semiconductor does not authorize its products for use as
critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Weida Semiconductor products
in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Weida Semiconductor against all charges.

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