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DM74LS395 Scheda tecnica(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte DM74LS395
Spiegazioni elettronici  4-Bit Shift Register with TRI-STATE Outputs
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM74LS395 Scheda tecnica(HTML) 3 Page - National Semiconductor (TI)

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Switching Characteristics
VCC ea50V TA ea25 C
Symbol
Parameter
RL e2kX CL e 15 pF
Units
Min
Max
fmax
Maximum Shift Frequency
30
MHz
tPLH
Propagation Delay
35
ns
tPHL
CP to On
25
tPHL
Propagation Delay
35
ns
MR to On
tPZH
Output Enable Time
20
ns
tPZL
20
tPHZ
Output Disable Time
17
ns
tPLZ
23
Functional Description
The ‘LS395 contains four D-type edge-triggered flip-flops
and auxiliary gating to select a D input either from a Parallel
(Pn) input or from the preceding stage When the Select
input is HIGH the Pn inputs are enabled A LOW signal in
the S input enables the serial inputs for shift-right opera-
tions as indicated in the Truth Table
State changes are initiated by HIGH-to-LOW transitions on
the Clock Pulse (CP) input Signals on the Pn DS and S
inputs can change when the Clock is in either state provid-
ed that the recommended setup and hold times are ob-
served When the S input is LOW a CP HIGH-LOW tran-
sition transfers data in O0 to O1 O1 to O2 and O2 to O3 A
left-shift is accomplished by connecting the outputs back to
the Pn inputs but offset one place to the left ie O3 to P2
O2 to P1 and O1 to P0 with P3 acting as the linking input
from another package
When the OE input is HIGH the output buffers are disabled
and the O0 – O3 outputs are in a high impedance condition
The shifting parallel loading or resetting operations can still
be accomplished however
Logic Diagram
TLF9833 – 3
3


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