MC74AC256N Просмотр технического описания (PDF) - Motorola => Freescale
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MC74AC256N Datasheet PDF : 7 Pages
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MC74AC256 MC74ACT256
MODE SELECT-FUNCTION TABLE
Operating
Mode
Master Reset
Inputs
Outputs
MR E D A0 A1 Q0 Q1 Q2 Q3
L HXXX L
L
L
L
L L d L L Q=d L
L
L
Demultiplex (Active HIGH L L d H L L Q = d L
L
Decoder when D = H)
L LdLH L
L Q=d L
L L dHH L
L
L Q=d
Store (Do Nothing)
H H X X X q0
q1
q2
q3
Addressable
Latch
H L d L L Q = d q1
q2
q3
H L d H L q0 Q = d q2
q3
H L d L H q0
q1 Q = d q3
H L d H H q0
q1
q2 Q = d
H = HIGH Voltage Level Steady State
L = LOW Voltage Level Steady State
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 or cleared.
E
Da
A0
A1
LOGIC DIAGRAM
MR Db
Q0a
Q1a
Q2a
Q3a
Q0b
Q1b
Q2b
Q3b
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
VCC
Vin
Vout
Iin
Iout
ICC
Tstg
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
DC Output Sink/Source Current, per Pin
DC VCC or GND Current per Output Pin
Storage Temperature
–0.5 to +7.0
V
–0.5 to VCC +0.5
V
–0.5 to VCC +0.5
V
±20
mA
±50
mA
±50
mA
–65 to +150
°C
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended
Operating Conditions.
FACT DATA
5-2
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