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74F673A Datenblatt(PDF) 2 Page - Fairchild Semiconductor

Teilenummer 74F673A
Bauteilbeschribung  16-Bit Serial-In, Serial/Parallel-Out Shift Register
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74F673A Datenblatt(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
indicated in the Shift Register Operations Table. A HIGH
signal on the Chip Select (CS) input prevents clocking and
forces the Serial Input/Output (SI/O) 3-STATE buffer into
the high impedance state. During serial shift-out opera-
tions, the SI/O buffer is active (i.e., enabled) and the output
data is also recirculated back into the shift register. When
parallel loading the shift register from the storage register,
serial shifting is inhibited.
The storage register has an asynchronous master reset
(STMR) input that overrides all other inputs and forces the
Q0–Q15 outputs LOW. The storage register is in the Hold
mode when either CS or the Read/Write (R/W) input is
HIGH. With CS and R/W both LOW, the storage register is
parallel loaded from the shift register.
Shift Register Operations Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
 = HIGH-to-LOW Transition
Storage Register Operations Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
 = LOW-to-HIGH Transition
Pin Names
Description
U.L.
Input IIH/IIL
HIGH/LOW
Output IOH/IOL
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
STMR
Store Master Reset Input (Active LOW)
1.0/1.0
20
µA/−0.6 mA
STCP
Store Clock Pulse Input
1.0/1.0
20
µA/−0.6 mA
R/W
Read/Write Input
1.0/1.0
20
µA/−0.6 mA
SI/O
Serial Data Input or
3.5/1.0
70
µA/−0.6 mA
3-STATE Serial Output
150/40
−3 mA/24 mA
Q0–Q15
Parallel Data Outputs
50/33.3
−1 mA/20 mA
Control Inputs
SI/O
Operating Mode
CS R/W SHCP STCP
Status
H
X
X
X
High Z
Hold
L
L
X
Data In
Serial Load
LH

L
Data Out Serial Output
with Recirculation
LH

H
Active
Parallel Load;
No Shifting
Control Inputs
Operating
STMR
CS
R/W
STCP
Mode
L
X
X
X
Reset; Outputs LOW
H
H
X
X
Hold
HX
HX
Hold
HL
L

Parallel Load


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