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SN54LS195A Datasheet(PDF) 4 Page - Motorola, Inc

Part No. SN54LS195A
Description  UNIVERSAL 4-BIT SHIFT REGISTER
Download  6 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

SN54LS195A Datasheet(HTML) 4 Page - Motorola, Inc

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5-369
FAST AND LS TTL DATA
SN54/74LS195A
DEFINITIONS OF TERMS
SETUP TIME(ts) —is defined as the minimum time required
for the correct logic level to be present at the logic input prior
to the clock transition from LOW to HIGH in order to be
recognized and transferred to the outputs.
HOLD TIME (th) — is defined as the minimum time following
the clock transition from LOW to HIGH that the logic level must
be maintained at the input in order to ensure continued
recognition. A negative HOLD TIME indicates that the correct
logic level may be released prior to the clock transition from
LOW to HIGH and still be recognized.
RECOVERY TIME (trec) — is defined as the minimum time
required between the end of the reset pulse and the clock
transition from LOW to HIGH in order to recognize and transfer
HIGH Data to the Q outputs.
AC WAVEFORMS
The shaded areas indicate when the input is permitted to change for predictable output performance.
Figure 1. Clock to Output Delays and
Clock Pulse Width
Figure 3. Setup (ts) and Hold (th) Time for Serial Data
(J & K) and Parallel Data (P0, P1, P2, P3)
Figure 2. Master Reset Pulse Width, Master Reset
to Output Delay and Master Reset to Clock
Recovery Time
Figure 4. Setup (ts) and Hold (th) Time for PE Input
CONDITIONS: MR = H
*Q0 STATE WILL BE DETERMINED BY J AND K INPUTS .
1.3 V
1.3 V
1.3 V
1.3 V
CLOCK
OUTPUT
PE
Qn = Pn
Qn* = Qn-1
trel
trel
ts(L)
ts(H)
LOAD PARALLEL DATA
LOAD SERIAL DATA
SHIFT RIGHT
1.3 V
CONDITIONS: PE = L
PO = P1 = P2 = P3 = H
CONDITIONS: MR = H
*J AND K SET-UP TIME AFFECTS Q0 ONLY
PE
J & K
P0 P1 P2 P3
CLOCK
OUTPUT*
CLOCK
CLOCK
OUTPUT
OUTPUT
ts(H)
th(L) = 0
th(H) = 0
th(H) = 0
ts(H)
th(L) = 0
ts(L)
tPHL
tPLH
ts(L)
MR
trec
tPHL
1.3V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
tW
CONDITIONS: J = PE = MR = H
K = L
tW
1.3 V


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