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UPD446-2 fiches techniques PDF

NEC - 2K x 8-BIT STATIC CMOS RAM

Numéro de référence UPD446-2
Description 2K x 8-BIT STATIC CMOS RAM
Fabricant NEC 
Logo NEC 





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UPD446-2 fiche technique
NEe Microcomputers, Inc.
2048 x 8 BIT STATIC CMOS RAM
NEe
f'PD446
f'PD446-1
pPD446-2
~rn~[~~~ ~illrnW
DESC RIPTION
The IlPD446 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
technique makes the IlPD446 a very low operating power device which requires
no clock or refreshing to operate. Minimum standby power current is drawn by this
device when CE equals VCC independently of the other input levels.
Data retention is guaranteed at a power supply voltage as low as 2V.
The IlPD446 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 I/O Using Three-State Output
• OE Eliminates Need for External Bus Buffers
• Max Access/Min Cycle Times Down to 120 ns
• Low Power Dissipation, 45 mA Max Activel100 IlA Max Standby/
10 IlA Max Data Retention
• Data Retention Voltage - 2V Min
• Standard 24-Pin Plastic and Ceramic Packages
• Plug-in Compatible with 16K EPROMs
II
PIN ·CONFIGURATION
2
4
5
A2 6
Al
AD S
1/01 9
1102
IlPD
446
24 VCC
23 AS
22 A9
21 WE
20 OE
19 Al0
1B CE
17 1/08
16 1107
15 1106
14 1105
13 1104
PIN NAMES
AO-Al0
'WE
Address Inputs
Write Enable
DE
CE
1/01-I/OB
VCC
Output Enable
Chip Enable
Data InputlOutput
Power (+5V)
GND
Ground
TRUTH TABLE
CE OE WE
MODE
110
ICC
H X X NOT SELECTED HZ STANDBY
L
H
H ' ' NDT SELECTED
HZ
ACTIVE
L L H READ
DOUT ACTIVE
L X L WRITE.
DIN
ACTIVE
99

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