74F398PC Fairchild Semiconductor, 74F398PC Datasheet - Page 3

• Manufacturer Part Number: 74F398PC
• Description: IC REGISTER QUAD 2-PORT 20-DIP
• Manufacturer: Fairchild Semiconductor
• Series: 74Fr
• Type: Multiplexerr

Specifications of 74F398PC

• Circuit: 4 x 2:1
• Independent Circuits: 1
• Voltage Supply Source: Single Supply
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output High, Low: -
• Other names: 74F398

Functional Description
The 74F398 and 74F399 are high-speed quad 2-port regis-
ters. They select 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 syn-
chronous 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
must be stable only a setup time prior to and hold time after
the LOW-to-HIGH transition of the Clock input for predict-
able operation. The 74F398 has both Q and Q outputs.
Logic Diagram
*F398 Only
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)
3
Function Table
H
L
h
I
X
Note 1: 74F398 only
LOW Voltage Level one setup time prior to the LOW-to-HIGH
LOW Voltage Level
HIGH Voltage Level one setup time prior to the LOW-to-HIGH
clock transition
clock transition
Immaterial
HIGH Voltage Level
S
h
h
I
I
Inputs
I
X
X
h
I
0
I
X
X
h
I
1
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Q
H
H
L
L
Outputs
(Note 1)
Q
H
H
L
L