SHIFT REGISTERS. SN54LS166 Datasheet

SN54LS166 REGISTERS. Datasheet pdf. Equivalent

SN54LS166 Datasheet
Recommendation SN54LS166 Datasheet
Part SN54LS166
Description 8-BIT SHIFT REGISTERS
Feature SN54LS166; SN54/74LS166 8-BIT SHIFT REGISTERS The SN54L/ 74LS166 is an 8-Bit Shift Register. Designed with all .
Manufacture Motorola Inc
Datasheet
Download SN54LS166 Datasheet




Motorola  Inc SN54LS166
8-BIT SHIFT REGISTERS
The SN54L/ 74LS166 is an 8-Bit Shift Register. Designed with all inputs
buffered, the drive requirements are lowered to one 54/ 74LS standard load.
By utilizing input clamping diodes, switching transients are minimized and
system design simplified.
The LS166 is a parallel-in or serial-in, serial-out shift register and has a
complexity of 77 equivalent gates with gated clock inputs and an overriding
clear input. The shift/load input establishes the parallel-in or serial-in mode.
When high, this input enables the serial data input and couples the eight
flip-flops for serial shifting with each clock pulse. Synchronous loading occurs
on the next clock pulse when this is low and the parallel data inputs are
enabled. Serial data flow is inhibited during parallel loading. Clocking is done
on the low-to-high level edge of the clock pulse via a two input positive NOR
gate, which permits one input to be used as a clock enable or clock inhibit
function. Clocking is inhibited when either of the clock inputs are held high,
holding either input low enables the other clock input. This will allow the
system clock to be free running and the register stopped on command with
the other clock input. A change from low-to-high on the clock inhibit input
should only be done when the clock input is high. A buffered direct clear input
overrides all other inputs, including the clock, and sets all flip-flops to zero.
Synchronous Load
Direct Overriding Clear
Parallel to Serial Conversion
PARALLEL PARALLEL INPUTS
SHIFT/ INPUT OUTPUT
VCC LOAD H QH G F E CLEAR
16 15 14 13 12 11 10 9
SHIFT/ H
LOAD
QH
SERIAL INPUT
A BC
GF E
CLEAR
D
CLOCK
INHIBIT
CK
1
SERIAL
INPUT
2345
AB CD
PARALLEL INPUTS
6 78
CLOCK CLOCK GND
INHIBIT
SN54/74LS166
8-BIT SHIFT REGISTERS
LOW POWER SCHOTTKY
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
SHIFT/
CLEAR LOAD
LX
HX
HL
HH
HH
HX
FUNCTION TABLE
INPUTS
CLOCK
PARALLEL
INHIBIT CLOCK SERIAL
A...H
XXX
X
L LX
X
L X a...h
L H
X
LL
X
HX
X
INTERNAL
OUTPUTS
QA
L
QA0
a
H
L
QA0
QB
L
QB0
b
QAn
QAn
QB0
OUTPUT
QH
L
QH0
h
QGn
QGn
QH0
FAST AND LS TTL DATA
5-1



Motorola  Inc SN54LS166
SN54 / 74LS166
Typical Clear, Shift, Load, Inhibit, and Shift Sequences
CLOCK
CLOCK INIHIBIT
CLEAR
SERIAL INPUT
SHIFT/LOAD
A
B
C
PARALLEL D
INPUTS
E
F
G
H
OUTPUT QH
CLEAR
SERIAL SHIFT
CLEAR (9)
SERIAL INPUT
SHIFT/LOAD
(1)
(15)
A (2)
(3)
B
(4)
C
(5)
D
(10)
E
(11)
F
(12)
G
(14)
H
(7)
CLOCK
(6)
CLOCK INHIBIT
H
L
H
L
H
L
H
H
INHIBIT H H L H L H L H
SERIAL SHIFT
LOAD
RS
CK
QA
RS
CK
QB
RS
CK
QC
RS
CK
QD
RS
CK
QE
RS
CK
QF
RS
CK
QG
RS
CK
(13) QH
FAST AND LS TTL DATA
5-2



Motorola  Inc SN54LS166
SN54 / 74LS166
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA Operating Ambient Temperature Range
IOH Output Current — High
IOL Output Current — Low
Min Typ Max Unit
54 4.5 5.0 5.5
74 4.75 5.0 5.25
V
54 – 55 25 125 °C
74 0 25 70
54, 74
– 0.4
mA
54 4.0 mA
74 8.0
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH Input HIGH Voltage
2.0
Guaranteed Input HIGH Voltage for
V All Inputs
54
VIL Input LOW Voltage 74
0.7 Guaranteed Input LOW Voltage for
0.8 V All Inputs
VIK
VOH
Input Clamp Diode Voltage
Output HIGH Voltage
54
74
– 0.65 – 1.5 V VCC = MIN, IIN = – 18 mA
2.5 3.5
2.7 3.5
V VCC = MIN, IOH = MAX, VIN = VIH
V or VIL per Truth Table
VOL
Output LOW Voltage
54, 74
74
0.25 0.4
0.35 0.5
V IOL = 4.0 mA VCC = VCC MIN,
VIN = VIL or VIH
V IOL = 8.0 mA per Truth Table
IIH Input HIGH Current
20 µA VCC = MAX, VIN = 2.7 V
0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current
– 0.4 mA VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current (Note 1)
– 20
– 100 mA VCC = MAX
ICC Power Supply Current
38
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
mA VCC = MAX
FAST AND LS TTL DATA
5-3







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