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PDF UPD2149-1 Data sheet ( Hoja de datos )

Número de pieza UPD2149-1
Descripción 4096 (1024 x 4) BIT STATIC RAM
Fabricantes NEC 
Logotipo NEC Logotipo



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No Preview Available ! UPD2149-1 Hoja de datos, Descripción, Manual

NEe Microcomputers, Inc.
NEe
JJ. PD2149
JJ. PD2149-1
po PD2149-2
~rn~[~~~~illrnW
4096 (1024x4) BIT STATIC RAM
DESCR IPTION
The JlPD2149 is a 4096-bit static Random Access Memory organized as 1024 words
bv 4-bits. Using a scaled NMOS technology, it incorporates an innovative design
approach which provides the ease-of-use features associated with non-clocked static
memories.
The JlPD2149 is encapsulated in an 18-pin ceramic package configured with the
industry standard pinout. It is directly TTL compatible in all respects: inputs, out-
puts, and a single +5V supply. The data is read out non-destructively and has the
same polarity as the input data.
FEATU RES
Completely Static Memory - No Clock or Timing Strobe Required
• Equal Access and Cycle Times, Faster Chip Select Access
• Single +5V Supply
• High Density 18-Pin Package
• Directly TTL Compatible - All Inputs and Outputs
• Common Input and Output
• Three-State Output
• Access Time: 35-55 ns MAX (From Address)
15-25 ns MAX (From Chip Select)
• Power Dissipation: 180 mA MAX
II
A6
A5
A4
A3
AO
A1
A2,
cs
GND
Vee
A7
AS
Ag
I/O,
1/02
1/03
1/04
WE
PIN NAMES
AO-Ag
Address Inputs
WE Write Enable
es ehip Select
1/0,-1/04 Data Input/Output
Vee
Power (+5V)
GND
Ground
TRUTH TABLE
es WE
HX
LL
LH
MODE
I/O
Not Selected High Z
Write
Read
DIN
DOUT
71

1 page




UPD2149-1 pdf
,uPD2149
WR ITE CYCLE ~
.TWC
-ADDRE.~
.- TWR---
\\ \ll",
// ////11
\\
-- --__ TAW!--
TOTW
TW
DOUT
//
TOW--- TDH
II
CDNotes:
WE is high for read cycle.
® WE orCSmust be high during all address transitions.
I'ACf(AGIf OUTLINE
#1'021410
ITEM
A
B
C
0
E
F
G
H
T
J
K
L
M
Ceramic
MflltMETERS
23.2 MAX.
1.44
2.54
0.45
20.32
1.2
2.5 MIN.
0.5 MIN.
4.6 MAX.
5.1 MAX.
7.62
6.7
0.25
INCHES
0.91 MAX.
0,055
0.1
0.02
0.8
0.06
0.1 MIN.
0.02 MIN.
0.18 MAX.
0.2 MAX.
0.3
0.26
0.01
2149DS·12·8()"CAT
75

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