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74F322 데이터시트(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 74F322
상세설명  Octal Serial/Parallel Register with Sign Extend
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

74F322 데이터시트(HTML) 3 Page - National Semiconductor (TI)

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Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
RE
Register Enable Input (Active LOW)
1010
20 mA b06 mA
SP
Serial (HIGH) or Parallel (LOW) Mode Control Input
1010
20 mA b06 mA
SE
Sign Extend Input (Active LOW)
1030
20 mA b18 mA
S
Serial Data Select Input
1020
20 mA b12 mA
D0 D1
Serial Data Inputs
1010
20 mA b06 mA
CP
Clock Pulse Input (Active Rising Edge)
1010
20 mA b06 mA
MR
Asynchronous Master Reset Input (Active LOW)
1010
20 mA b06 mA
OE
TRI-STATE Output Enable Input (Active LOW)
1010
20 mA b06 mA
Q0
Bi-State Serial Output
50333
b
1 mA b20 mA
IO0–IO7 Multiplexed Parallel Data Inputs or
351083
70 mA b065 mA
TRI-STATE Parallel Data Outputs
15040 (333) b3 mA24 mA (20 mA)
Functional Description
The ’F322 contains eight D-type edge triggered flip-flops
and the interstage gating required to perform right shift and
the intrastage gating necessary for hold and synchronous
parallel load operations A LOW signal on RE enables shift-
ing or parallel loading while a HIGH signal enables the hold
mode A HIGH signal on SP enables shift right while a
LOW signal disables the TRI-STATE output buffers and en-
ables parallel loading In the shift right mode a HIGH signal
on SE enables serial entry from either D0 or D1 as deter-
mined by the S input A LOW signal on SE enables shift right
but Q7 reloads its contents thus performing the sign extend
function required for the ’F384 Twos Complement Multiplier
A HIGH signal on OE disables the TRI-STATE output buff-
ers regardless of the other control inputs In this condition
the shifting and loading operations can still be performed
Mode Select Table
Mode
Inputs
Outputs
Q0
MR
RE
SP
SE
SOE
CP
IO7
IO6
IO5
IO4
IO3
IO2
IO1
IO0
Clear
L
X
X
X
X
L
X
L
L
L
L
L
L
L
L
L
L
X
X
X
X
H
X
Z
ZZZZZZZ
L
Parallel
HL
L
X
X
X
L
I7
I6
I5
I4
I3
I2
I1
I0
I0
Load
Shift
H
L
H
H
L
L
L
D0
O7
O6
O5
O4
O3
O2
O1
O1
Right
H
L
H
H
H
L
L
D1
O7
O6
O5
O4
O3
O2
O1
O1
Sign
HL
H
L
X
L
L
O7
O7
O6
O5
O4
O3
O2
O1
O1
Extend
Hold
H
H
X
X
X
L
L
NC
NC
NC
NC
NC
NC
NC
NC
NC
When the OE input is HIGH all IOn terminals are at the high impedance state sequential operation or clearing of the register is not affected
Note 1
I7–I0 e The level of the steady-state input at the respective IO terminal is loaded into the flip-flop while the flip-flop outputs (except Q0) are isolated from
the IO terminal
Note 2
D0 D1 e The level of the steady-state inputs to the serial multiplexer input
Note 3
O7–O0 e The level of the respective Qn flip-flop prior to the last Clock LOW-to-HIGH transition
H e HIGH Voltage Level
L e LOW Voltage Level
Z e High Impedance Output State
L e LOW-to-HIGH Transition
NC e No Change
3


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유사한 설명 - 74F322

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