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PDF UPD447 Data sheet ( Hoja de datos )

Número de pieza UPD447
Descripción 2K x 8 BIT STATIC CMOS RAM
Fabricantes NEC 
Logotipo NEC Logotipo



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No Preview Available ! UPD447 Hoja de datos, Descripción, Manual

NEe Microcomputers, Inc.
2048 x 8 BIT STATIC CMOS RAM
NEe
}LPD447
}LPD447-1
}L PD447-2
~rn~[~~~~illrnW
OESCR IPTI ON
The J-lPD447 is a high speed, low power, 2048 word by 8 bit static CMOS RAM
fabricated using an advanced silicon gate CMOS technology. A unique circuitry tech-
nique makes the J-lPD447 a very low operating power device which requires no clock
or refreshing to operate.
Since the device has two chip enable inputs, it is suited for battery backup applica-
tions. Minimum standby power current is drawn by this device when CE2 equals VCC
independently of the other input levels.
II
Data Retention is guaranteed at a power supply voltage as low as 2V.
TheJ-lPD447 is packaged in a standard 24-pin dual-in-line package and is plug-in
compatible with 16K EPROMs.
FEATU RES
Single +5V Supply
• Fully Static Operation - No Clock or Refreshing required
• TTL Compatible - All Inputs and Outputs
• Common Data Input and Output Using Three-State Output
• Two Chip Enable Inputs for Battery Operation
• Max Access/Min Cycle Times Down to 120 ns
~ Low Power Dissipation; 45 mA Max Active/100 J-lA Max Standby/
10 J-lA Max Data Retention
• Data Retention Voltage - 2V Min
• Standard 24-Pin Plastic imd Ceramic Packages
• Plug-in Compatible with 16K EPROMs
PIN CONFIGURATION
2
3
4
5
6
Al
8
1/01 9
10
J-lPD
447
12
24 VCC
23 Aa
22 Ag
21 WE
20 CEI
19 Al0
18 CE2
17 I/oa
16 1/07
1/06
14 1/05
13 1/04
PIN NAMES
AO-AlO
WE"
Address Inputs
Write Enable
CE1-m Ch ip Enable Inputs
1/0\-1/08 Data Input/Output
VCC
Power (+5V)
GND
Ground
TRUTH TABLE
CEI CE2 WE
MODE
I/O ICC
X H X NOT SELECTED HZ STANDBY
H X X NOT SELECTED HZ ACTIVE
L L L WRITE
DIN ACTIVE
L L H READ
DOUT ACTIVE
105

1 page




UPD447 pdf
AC TEST CONDITION~
PACKAGE OUTLINE
J,tPD447C
Input Pulse Levels
Input Rise and Fall Times
Input and Output Timing Reference Levels
Output Load
.----- A---------i
J'PD447
O.BV to 2.2V
10 ns
1.5V
lTTL+l00pF
J,tPD447D
ITEM
A
D
G
H
M
(PLASTIC)
MILLIMETERS
33 MAX
2.53
2.54
0.5 + 0.1
27.94
1.5
2.54 MIN
0.5 MIN
5.22 MAX
5.72 MAX
15.24
13.2
+0.10
0.25 -0.05
INCHES
1.3MAX
0.1
0.1
0.02 ± 0.004
1.1
0.059
0.1 MIN
0.02 MIN
0.205 MAX
0.225 MAX
0.6
0.52
"'0.004
0.01
-0.0019
ITEM
A
C
D
G
H
K
M
(CERDIP)
MILLIMETERS
33.5 MAX.
2.78
2.54
0.46
27.94
1.5
2.54 MIN.
O.SMIN.
4.58 MAX.
5.08 MAX.
15.24
13.5
O.25~:~~
INCHES
1.32 MAX,
0.11
0.1
0.018
1.1
0.059
0.1 MIN.
0.019 MIN.
0.181 MAX.
0.2 MAX.
0.6
0.53
O.Ol:~:~~
44705-12·8G-CAT
109

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