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UPD421-3 fiches techniques PDF

NEC - 8K BIT STATIC RAM

Numéro de référence UPD421-3
Description 8K BIT STATIC RAM
Fabricant NEC 
Logo NEC 





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UPD421-3 fiche technique
NEe Microcomputers, Inc.
NEe
fL PD421
J.L PD421-1
fL PD421-2
fL PD421-3
J.L PD421-5
8K BIT STATIC RAM
DESCR IPTION
The NEC MPD421 is a very high speed 8192 bit static Random Access Memory organ-
ized as 1024 words by 8 bits. Features include a power down mode controlled by the
chip select input for an 80% power saving.
FEATURES
1024x8-bitOrganization
• Very Fast Access Time: 150/200/250/300/450 ns
• Single +5V Power Supply
• Low Power Standby Mode
• N-Channel Silicon Gate Process
• Fully TTL Compatible
• 6-Device Static Cell
• Three State Common I/O
• Compatible with 8108 and Equivalent Devices
• Available in 22 Pin Ceramic Dual-in-Line Package
11
PIN CONFIGURATION
A6
22 Vee
As 2
21 A7
A4 3
A3 4
AS
19 A9
A2 5 MPD lS Cs
A1 6
421 17 WE
AO
1/°1
1/°2
1/°3
GND
7
S
9
10
11
16 I/OS
15 1/°7
14 1/°6
13 1/°5
12 1/°4
PIN NAMES
AO-Ag
Address Inputs
WE Write Enable
es Chip Select
1/0,-1/08 Data Input Output
VCC
Power (+5V)
GND
Ground
77

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