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PDF HT23C256 Data sheet ( Hoja de datos )
| Número de pieza | HT23C256 | |
| Descripción | CMOS 32K x 8-Bit Mask ROM | |
| Fabricantes | Holtek Microelectronics | |
| Logotipo |  |
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HT23C256
CMOS 32K´8-Bit Mask ROM
Features
· Operating voltage 2.7V~5.5V
· Low power consumption
- Operation: 25mA max. (VCC=5V)
10mA max. (VCC=3V)
- Standby: 30mA max. (VCC=5V)
10mA max. (VCC=3V)
· Access time: 150ns max. (VCC=5V)
250ns max. (VCC=3V)
· 32768´8-bit of mask ROM
· Mask options: chip enable CE/CE/OE1/OE1 and output
enable OE/OE/NC
· TTL compatible inputs and outputs
· Tristate outputs
· Fully static operation
· 28-pin DIP/SOP package
General Description
The HT23C256 is a read-only memory with high perfor-
mance CMOS storage device whose 256K of memory is
arranged into 32768 words by 8 bits.
For application flexibility, the chip enable and output en-
able control pins can be selected as active high or active
low. This flexibility not only allows easy interface with
most microprocessors, but also eliminates bus conten-
tion in multiple bus microprocessor systems. An addi-
tional feature of the HT23C256 is its ability to enter the
standby mode whenever the chip enable (CE/CE) is in-
active, thus reducing current consumption to below
30mA. The combination of these functions makes the
chip suitable for high density low power memory appli-
cations.
Block Diagram
A0
X -D e c
Y -D e c
M e m o ry
C e ll
( 3 2 K ´ 8 B its )
A d d re s s
B u ffe rs
X Y -P re D e c
A 14
Z -D e c
C E /C E /O E 1 /O E 1
O E /O E /N C
C o n tro l
L o g ic
VSS VC C
S ense A m p
O u tp u t B u ffe rs
D0 D7
Rev. 1.10
1 August 30, 2002
1 page  
Characteristic Curves
1 .5
1 .2 5
1
0 .7 5
0 .5
4 .5
T a = 2 5 °C
5 5 .5
O p e r a tin g V o lta g e V C C (V )
HT23C256
1 .5
1 .2 5
1
0 .7 5
0 .5
-50
V CC=5V
-25 0 25
50
T e m p e ra tu re (°C )
75
1 .5
1 .2 5
1
0 .7 5
0 .5
4 .5
T a = 2 5 °C
5 5 .5
O p e r a tin g V o lta g e V C C (V )
1 .5
1 .2 5
1
0 .7 5
0 .5
-50
V CC=5V
-25 0 25 50
T e m p e ra tu re (°C )
75
1 .5
1 .2 5
1
0 .7 5
0 .5
4 .5
T a = 2 5 °C
5
O p e r a tin g V o lta g e V C C (V )
5 .5
1 .5
1 .2 5
1
0 .7 5
0 .5
-50
V CC=5V
-25 0 25 50
T e m p e ra tu re (°C )
75
Rev. 1.10
5 August 30, 2002
5 Page 
Carrier tape dimensions
D
E
.
P0
D1 P
HT23C256
P1 t
W
C B0
K0
A0
SOP 28W
Symbol
W
P
E
F
D
D1
P0
P1
A0
B0
K0
t
C
Description
Carrier Tape Width
Cavity Pitch
Perforation Position
Cavity to Perforation (Width Direction)
Perforation Diameter
Cavity Hole Diameter
Perforation Pitch
Cavity to Perforation (Length Direction)
Cavity Length
Cavity Width
Cavity Depth
Carrier Tape Thickness
Cover Tape Width
Dimensions in mm
24.0±0.3
12.0±0.1
1.75±0.1
11.5±0.1
1.5+0.1
1.5+0.25
4.0±0.1
2.0±0.1
10.85±0.1
18.34±0.1
2.97±0.1
0.35±0.01
21.3
Rev. 1.10
11 August 30, 2002
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet HT23C256.PDF ] | |
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