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54298DMQB Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # 54298DMQB
Description  Quad 2-Port Register (Multiplexer With Storage)
PDF  4 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

54298DMQB Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Switching Characteristics VCC ea50V TA ea25 C (See Section 1 for test waveforms and output load)
CL e 15 pF
Symbol
Parameter
RL e 400X
Units
Min
Max
tPLH
Propagation Delay CP to Qn
27
ns
tPHL
32
Functional Description
This device is a high speed quad 2-port register It selects
four bits of data from two sources (ports) under the control
of a Common Select input (S) The selected data is trans-
ferred to the 4-bit output register synchronous with the
HIGH-to-LOW transition of the Clock input (CP) The 4-bit
output register is fully edge-triggered The Data inputs (Inx)
and Select input (S) need be stable only one setup time
prior to the HIGH-to-LOW transition of the clock for predict-
able operation
Truth Table
Inputs
Output
SI0x
I1x
Qx
II
X
L
Ih
X
H
hX
l
L
hX
h
H
l e LOW Voltage Level one setup time prior to the HIGH-to-LOWclock
transition
h e HIGH Voltage Level one setup time prior to the HIGH-to-LOW clock
transition
H e HIGH Voltage level
L e LOW Voltage level
X e Immaterial
Logic Diagram
TLF10215 – 3
3



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