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SN54LS398 Datasheet(PDF) 2 Page - Motorola, Inc

Part No. SN54LS398
Description  QUAD 2-PORT REGISTER
Download  6 Pages
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

SN54LS398 Datasheet(HTML) 2 Page - Motorola, Inc

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FAST AND LS TTL DATA
SN54/74LS398
• SN54/74LS399
FUNCTIONAL BLOCK DIAGRAM
IOA
S
IIA
IOB
IIB
IOC
IIC
IOD
IID
S
S
S
S
R
R
R
R
QA
QA
QB
QB
QC
QC
QD
QD
*
*
*
*
* SN54 / 74LS398 only
FUNCTIONAL DESCRIPTION
The SN54 / 74LS398 and SN54 / 74LS399 are high-speed
Quad 2-Port Registers. They select four bits of data from two
sources (Ports) under the 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 in-
put (CP). The 4-Bit RS type output register is fully edge-trig-
gered. The Data inputs (I) and Select inputs (S) must be stable
only a setup time prior to and hold time after the LOW-to-HIGH
transition of the Clock input for predictable operation. The
SN54 / 74LS398 has both Q and Q Outputs available.
FUNCTION TABLE
INPUTS
OUTPUTS
S
I0
I1
Q
Q*
I
I
X
L
H
I
h
X
H
L
h
X
I
L
H
h
X
h
H
L
*SN54 / 74LS398 only
I = LOW Voltage Level one setup time pior to the LOW-to-HIGH clock transition
h = HIGH Voltage Level one setup time prior to the LOW-to-HIGH clock transition
L = LOW Voltage Level
H = HIGH Voltage Level
X = Immaterial


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