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74F675A 数据表(PDF) 2 Page - Fairchild Semiconductor

部件名 74F675A
功能描述  16-Bit Serial-In, Serial/Parallel-Out Shift Register
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

74F675A 数据表(HTML) 2 Page - Fairchild Semiconductor

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Unit Loading/Fan Out
Functional Description
The 16-Bit shift register operates in one of four modes, as
determined by the signals applied to the Chip Select (CS),
Read/Write (R/W) and Store Clock Pulse (STCP) input.
State changes are indicated by the falling edge of the Shift
Clock Pulse (SHCP). In the Shift Right mode, data enters
D0 from the Serial Input (SI) pin and exits from Q15 via the
Serial Data Output (SO) pin. In the Parallel Load mode,
data from the storage register outputs enter the shift regis-
ter and serial shifting is inhibited.
The storage register is in the Hold mode when either CS or
R/W is HIGH. With CS and R/W both LOW, the storage
register is parallel loaded from the shift register on the ris-
ing edge of STCP.
To prevent false clocking of the shift register, SHCP should
be in the LOW state during a LOW-to-HIGH transition of
CS. To prevent false clocking of the storage register, STCP
should be LOW during a HIGH-to-LOW transition of CS if
R/W is LOW, and should also be LOW during a
HIGH-to-LOW transition of R/W if CS is LOW.
Shift Register Operations Table
Storage Register Operations Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
 = HIGH-to-LOW Transition
 = LOW-to-HIGH Transition
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Pin Names
Description
U.L.
Input IIH/IIL
HIGH/LOW
Output IOH/IOL
SI
Serial Data Input
1.0/1.0
20
µA/−0.6 mA
CS
Chip Select Input (Active LOW)
1.0/1.0
20
µA/−0.6 mA
SHCP
Shift Clock Pulse Input (Active Falling Edge)
1.0/1.0
20
µA/−0.6 mA
STCP
Store Clock Pulse Input (Active Rising Edge)
1.0/1.0
20
µA/−0.6 mA
R/W
Read/Write Input
1.0/1.0
20
µA/−0.6 mA
SO
Serial Data Output
50/33.3
−1 mA/20 mA
Q0–Q15
Parallel Data Outputs
50/33.3
−1 mA/20 mA
Control Inputs
Operating
CS
R/W
SHCP STCP
Mode
H
X
X
X
Hold
LL

X
Shift Right
LH

L
Shift Right
LH

H
Parallel Load,
No Shifting
Inputs
Operating
CS
R/W
STCP
Mode
HX
X
Hold
LH
X
Hold
LL

Parallel Load


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