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PDF UM2147 Data sheet ( Hoja de datos )

Número de pieza UM2147
Descripción 4K x 1 High Speed NMOS SRAM
Fabricantes UMC 
Logotipo UMC Logotipo



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No Preview Available ! UM2147 Hoja de datos, Descripción, Manual

SUMO
UM2147
High Speed NMOS SRAM
Features
• 45 ns maximum access time
• No clocks or strobes required
• Automatic CE power down
• Identical cycle and access times
• Single +5V supply 10%)
• Pinout and function compatible to SY2147
• Total TTL compatible:
All inputs and outputs
• Separate data input and output
• High density 18-pin package
• Three-state output
General Description
The UMC UM2147 is a 4096-Bit Static Random Access
Memory organized 4096 words by 1-bit and is fabricated
using UMC's new scaled N-channel silicon gate technology.
It is designed using fully static circuitry, therefore requiring
no clock or refreshing to operate. Address set-up times
are not required and the data is read out non-destructively
with the same polarity as the input data. Separate data
input and output pins provide maximum design flexibility.
The three-state output facilitates memory expansion by
allowing the outputs to be OR-tied to other devices.
The UM2147 offers an automatic power down feature.
Power down is controlled by the Chip Enable input. When
Chip Enable (CE) goes high, thus deselecting the UM2147
the device will automatically power down and r€main
in a standby power mode as long as CE remain high. This
unique feature provides system level power savings as
much as 80%.
The UM2147 is packaged in an 18-pin DIP for the highest
possible density. The device is fully TTL compatible and
has a si ngle +5V. power supply.
Pin Configuration
Block Diagram
A1 - V C C
_GND
AO
A1
A2
A3
A4
As
DOUT
WE
GND
vcc
ROW
SELECT
MEMORY ARRAY
64 ROWS
64 COLUMNS
A6
A7 As
As
A9
A10
DIN ------I.~
All
DIN
CE
CE - -.....-11-,
2-3

1 page




UM2147 pdf
UM2147
WRITE CYCLE NO.2 (CE CONTROLLED) (NOTE 6)
:J~ADDRESS
twc
.
j~
I--tAS
tcw
CE ~~
)f-
tAW
/---twp
WE \\\\\\\\\\\~~
tow
!-tWR-
)f- / / / / / / / / /
tDH
DATA IN
~~ DATA VALID
)~
____________________________f_._._-_-_tw__z-1
HIGH IMPEDANCE
DATA OUT
DATA UNDEFINED
~~-------------------
A.C. Testing Input, Output Waveform
3.0V
<2.0V
1.5V -TEST POINTS
OV----
INPUT
0.8V
OUTPUT
A.C. TESTING: INPUTS ARE DRIVEN AT 3.0V FOR A
LOGIC "'" AND O.OV FOR A LOGIC "0". TIMING MEAS-
UREMENTS ARE MADE AT 2.0V FOR A LOGIC "1" AND
0.8V FOR A LOGIC "0" AT THE OUTPUTS. THE INPUTS
ARE MEASURED AT 1.5V. INPUT RISE AND FALL TIMES
ARE 5 ns.
A.C. Testing Load Circuit
+5V
+5V
510n
510n
30pF
(INCLUDING
SCOPE AND
JIG)
=
LOAD A.
DOUT --,----i
300 5pF
LOAD B.
Ordering Information
Part
Number
UM2147
UM2147-1
UM2147-2
UM2147L
UM2147L-1
Access
Time
(Max.)
70 ns
55 ns
45 ns
70 ns
55 ns
Operating
Current
(Max.)
160mA
180 mA
180mA
140mA
125mA
Stand by
Current
(Max.)
20mA
30mA
30mA
10mA
15mA
Package
Type
Plastic
Plastic
Plastic
Plastic
Plastic
2-7

5 Page










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