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PDF MC74AC256 Data sheet ( Hoja de datos )
| Número de pieza | MC74AC256 | |
| Descripción | DUAL 4-BIT ADDRESSABLE LATCH | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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MC74AC256
MC74ACT256
Dual 4ĆBit Addressable Latch
The MC74AC256/74ACT256 dual addressable latch has four distinct modes
of operation which are selectable by controlling the Clear and Enable inputs
(see Function Table). In the addressable latch mode, data at the Data (D) inputs
is written into the addressed latches. The addressed latches will follow the Data
input with all unaddressed latches remaining in their previous states.
In the memory mode, all latches remain in their previous states and are
unaffected by the Data or Address inputs. To eliminate the possibility of entering
erroneous data in the latches, the enable should be held HIGH (inactive) while
the address lines are changing. In the dual 1-of-4 decoding or demultiplexing
mode (MR = E = LOW), addressed outputs will follow the level of the D inputs
with all other outputs LOW. In the clear mode, all outputs are LOW and unaffected
by the Address and Data inputs.
• Combines Dual Demultiplexer and 8-Bit Latch
• Serial-to-Parallel Capability
• Output from Each Storage Bit Available
• Random (Addressable) Data Entry
• Easily Expandable
• Common Clear Input
• Useful as Dual 1-of-4 Active HIGH Decoder
VCC MR E Db Q3b Q2b Q1b Q0b
16 15 14 13 12 11 10 9
DUAL 4-BIT
ADDRESSABLE
LATCH
N SUFFIX
CASE 648-08
PLASTIC
D SUFFIX
CASE 751B-05
PLASTIC
12345678
A0 A1 Da Q0a Q1a Q2a Q3a GND
LOGIC SYMBOL
Da Db
A0
E
A1 MR
Q0a Q1a Q2a Q3a Q0b Q1b Q2b Q3b
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FACT DATA
5-1
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1 page  
MC74AC256 MC74ACT256
DC CHARACTERISTICS
74ACT
74ACT
Symbol
Parameter
VCC
(V)
TA = +25°C
TA =
–40°C to +85°C
Unit
Conditions
Typ Guaranteed Limits
VIH
VIL
VOH
Minimum High Level
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
Output Voltage
4.5 1.5 2.0
5.5 1.5 2.0
4.5 1.5 0.8
5.5 1.5 0.8
4.5 4.49 4.4
5.5 5.49 5.4
2.0
2.0
0.8
0.8
4.4
5.4
V
VOUT = 0.1 V
or VCC – 0.1 V
V
VOUT = 0.1 V
or VCC – 0.1 V
V IOUT = –50 µA
VOL
Maximum Low Level
Output Voltage
4.5 3.86
5.5 4.86
4.5 0.001 0.1
5.5 0.001 0.1
3.76
4.76
0.1
0.1
*VIN = VIL or VIH
V
IOH
–24 mA
–24 mA
V IOUT = 50 µA
IIN Maximum Input
Leakage Current
*VIN = VIL or VIH
4.5
5.5
0.36 0.44
0.36 0.44
V
IOL
24 mA
24 mA
5.5
±0.1 ±1.0
µA VI = VCC, GND
∆ICCT
IOLD
IOHD
ICC
Additional Max. ICC/Input
†Minimum Dynamic
Output Current
Maximum Quiescent
Supply Current
5.5 0.6
5.5
5.5
5.5 8.0
1.5
75
–75
80
mA VI = VCC – 2.1 V
mA VOLD = 1.65 V Max
mA VOHD = 3.85 V Min
µA VIN = VCC or GND
* All outputs loaded; thresholds on input associated with output under test.
† Maximum test duration 2.0 ms, one output loaded at a time.
FACT DATA
5-5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MC74AC256.PDF ] | |
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