MC74ACT259NG ON Semiconductor, MC74ACT259NG Datasheet - Page 2

• Manufacturer Part Number: MC74ACT259NG
• Description: IC LATCH ADDRESS 8BIT 16-DIP
• Manufacturer: ON Semiconductor
• Series: 74ACTr

Specifications of MC74ACT259NG

• Logic Type: D-Type, Addressable
• Circuit: 1:8
• Output Type: Standard
• Voltage - Supply: 4.5 V ~ 5.5 V
• Independent Circuits: 1
• Delay Time - Propagation: 6.5ns
• Current - Output High, Low: 24mA, 24mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

operation as shown in the Mode Selection Table. In the
addressable latch mode, data on the Data line (D) is written
into the addressed latch. The addressed latch will follow the
data input with all non−addressed latches remaining in their
previous states in the memory mode. All latches remain in
their previous state and are unaffected by the Data or
Address inputs.
The MC74AC259/74ACT259 has four modes of
MODE SELECT−FUNCTION TABLE
Master Reset
Demultiplex
(Active HIGH
Decoder when
D = H)
Store
(Do Nothing)
Addressable
Latch
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
d = HIGH or LOW Data one setup time prior to the LOW−to−HIGH Enable transition
q = Lower case letters indicate the state of the referenced output established during the last cycle in which it was addressed
Operating
FUNCTIONAL DESCRIPTION
or cleared.
Mode
MR
H
H
H
H
H
L
L
L
L
L
•
•
•
•
•
•
E
H
H
L
L
L
•
•
•
L
L
L
L
•
•
•
L
D
X
X
Inputs
d
d
d
d
d
d
d
d
•
•
•
•
•
•
A
H
H
H
H
X
X
L
L
•
•
•
L
L
•
•
•
0
MC74AC259, MC74ACT259
A
X
H
H
X
H
H
L
L
L
L
•
•
•
•
•
•
1
A
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X
H
X
H
L
L
L
L
L
L
•
•
•
•
•
•
2
Q = d
Q = d
Q
q
q
q
q
L
L
L
L
•
•
•
•
•
•
0
0
0
0
0
2
Q = d
Q = d
addressed output will follow the state of the D input with all
other outputs in the LOW state. In the clear mode all outputs
are LOW and unaffected by the address and data inputs.
When operating the MC74AC/ACT259 as an addressable
latch, changing more than one bit of the address could
impose a transient wrong address. Therefore, this should
only be done while in the memory mode. The Mode Select
Function Table summarizes the operations of the
MC74AC/ACT259.
Q
q
q
q
q
L
L
L
L
•
•
•
•
•
•
1
1
1
1
1
In the one−of−eight decoding or demultiplexing mode, the
Q = d
Q = d
Q
q
q
q
q
L
L
L
•
•
•
L
•
•
•
2
2
2
2
2
Q
q
q
q
q
q
L
L
L
L
L
•
•
•
•
•
•
Outputs
3
3
3
3
3
3
Q
q
q
q
q
q
L
L
L
L
•
•
•
L
•
•
•
4
4
4
4
4
4
Q
q
q
q
q
q
L
L
L
L
L
•
•
•
•
•
•
5
5
5
5
5
5
Q
q
q
q
q
q
L
L
L
L
•
•
•
L
•
•
•
6
6
6
6
6
6
Q = d
Q = d
Q
q
q
q
q
L
L
L
L
•
•
•
•
•
•
7
7
7
7
7