HD74AC259 Datasheet, PDF (4/11 Pages) Hitachi Semiconductor – 8-bit Addressable Latch

HD74AC259
Function Table
Inputs
Outputs
Operating Mode MR E D A₀ A₁ A₂ Q₀ Q₁ Q₂ Q₃ Q₄ Q₅ Q₆ Q₇
Master reset
L HX XXXL
L
L
L
L
L
L
L
Demultiplex
L L d L L L Q=d L L L L L L L
(Active HIGH
L L d HL L L
Q=d L
L
L
L
L
L
Decoder when
L L d L HL L
L
Q=d L
L
L
L
L
D = H)
L L d HHL L
L
L
Q=d L
L
L
L
L L d L L HL
L
L
L
Q=d L
L
L
L L d HL HL
L
L
L
L
Q=d L
L
L L d L HHL
L
L
L
L
L
Q=d L
L L d HHHL
L
L
L
L
L
L
Q=d
Store (Do nothing) H H X X X X q₀
q₁
q₂
q₃
q₄
q₅
q₆
q₇
Addressable latch H L d L L L Q = d q₁ q₂ q₃ q₄ q₅ q₆ q₇
H L d H L L q₀
Q = d q₂
q₃
q₄
q₅
q₆
q₇
H L d L H L q₀
q₁
Q = d q₃
q₄
q₅
q₆
q₇
H L d H H L q₀
q₁
q₂
Q = d q₄
q₅
q₆
q₇
H L d L L H q₀
q₁
q₂
q₃
Q = d q₅
q₆
q₇
H L d H L H q₀
q₁
q₂
q₃
q₄
Q = d q₆
q₇
H L d L H H q₀
q₁
q₂
q₃
q₄
q₅
Q = d q₇
H L d H H H q₀
q₁
q₂
q₃
q₄
q₅
q₆
Q=d
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 or cleared.
DC Characteristics (unless otherwise specified)
Item
Symbol Max
Unit
Maximum quiescent supply current I_CC
80
µA
Maximum quiescent supply current I_CC
8.0
µA
Condition
V_IN = V_CC or ground, V_CC = 5.5 V,
Ta = Worst case
V_IN = V_CC or ground, V_CC = 5.5 V,
Ta = 25°C
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