74ACT399SJ_Q Fairchild Semiconductor, 74ACT399SJ_Q Datasheet - Page 2

• Manufacturer Part Number: 74ACT399SJ_Q
• Description: Encoders, Decoders, Multiplexers & Demultiplexers Quad 2-Port Register
• Manufacturer: Fairchild Semiconductor

Specifications of 74ACT399SJ_Q

• Product: Multiplexers
• Logic Family: 74ACT
• Number Of Lines (input / Output): 8 / 4
• Propagation Delay Time: 9 ns at 5 V
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 4.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-20
• Minimum Operating Temperature: - 40 C
• Number Of Input Lines: 8
• Number Of Output Lines: 4

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Functional Description
The AC/ACT399 is a high-speed quad 2-port register. It
selects four bits of data from either of two sources (Ports)
under control of a common Select input (S). The selected
data is transferred to a 4-bit output register synchronous
with the LOW-to-HIGH transition of the Clock input (CP).
The 4-bit D-type output register is fully edge-triggered. The
Data inputs (I
only a setup time prior to and hold time after the LOW-to-
HIGH transition of the Clock input for predictable operation.
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
0x
, I
1x
) and Select input (S) must be stable
2
Function Table
H
L

X
LOW Voltage Level
HIGH Voltage Level
Immaterial
S
H
H
LOW-to-HIGH Clock Transition
L
L
I
H
L
X
X
0
Inputs
I
H
X
X
L
1
CP




Q
L
H
L
H
Outputs
Q
H
H
L
L