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SHIFT/STORAGE REGISTER. SN54LS299 Datasheet |
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8-BIT SHIFT/STORAGE REGISTER
WITH 3-STATE OUTPUTS
The SN54 / 74LS299 is an 8-Bit Universal Shift / Storage Register with
3-state outputs. Four modes of operation are possible: hold (store), shift left,
shift right and load data.
The parallel load inputs and flip-flop outputs are multiplexed to reduce the
total number of package pins. Separate outputs are provided for flip-flops Q0
and Q7 to allow easy cascading. A separate active LOW Master Reset is used
to reset the register.
• Common I/O for Reduced Pin Count
• Four Operation Modes: Shift Left, Shift Right, Load and Store
• Separate Shift Right Serial Input and Shift Left Serial Input for Easy
Cascading
• 3-State Outputs for Bus Oriented Applications
• Input Clamp Diodes Limit High-Speed Termination Effects
• ESD > 3500 Volts
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC S1
20
19
Ds7
18
Q7 I/O7 I/O5 I/O3 I/O1 CP DS0
17
16
15
14
13
12
11
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
1
S0
2 3 4 56 78
OE1 OE2 I/O6 I/O4 I/O2 I/O0 Q0
9 10
MR GND
SN54/74LS299
8-BIT SHIFT/STORAGE REGISTER
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
20
1
20
1
20
1
J SUFFIX
CERAMIC
CASE 732-03
N SUFFIX
PLASTIC
CASE 738-03
DW SUFFIX
SOIC
CASE 751D-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
PIN NAMES
LOADING (Note a)
HIGH
LOW
CP
DS0
DS7
I/On
OE1, OE2
Q0, Q7
MR
S0, S1
Clock Pulse (active positive-going edge) Input
Serial Data Input for Right Shift
Serial Data Input for Left Shift
Parallel Data Input or
Parallel Output (3-State) (Note c)
3-State Output Enable (active LOW) Inputs
Serial Outputs (Note b)
Asynchronous Master Reset (active LOW) Input
Mode Select Inputs
0.5 U.L.
0.5 U.L.
0.5 U.L.
0.5 U.L.
65 (25) U.L.
0.5 U.L.
10 U.L.
0.5 U.L.
1 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
15 (7.5) U.L.
0.25 U.L.
5 (2.5) U.L.
0.25 U.L.
0.5 U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges.
c) The Output LOW drive factor is 7.5 U.L for Military (54) and 15 U.L. for Commercial (74). The Output HIGH drive factor is 25 U.L. for Military (54) and 65 U.L. for
Commercial (74) Temperature Ranges.
FAST AND LS TTL DATA
5-479
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S1 19 S0 1
SN54 / 74LS299
LOGIC DIAGRAM
DS0
11
18
DS7
12
CLOCK
8
Q0
MR
9
OE1
OE2
2
3
D CK
CLR
Q
D CK
CLR
Q
D CK
CLR
Q
7
I/O0
13
I/O1
6
I/O2
D CK
CLR
Q
14
I/O3
D CK
CLR
Q
5
I/O4
D CK
CLR
Q
15
I/O5
D CK
CLR
Q
4
I/O6
D CK
CLR
Q
17
Q7
16
I/O7
VCC = PIN 20
GND = PIN 10
= PIN NUMBERS
INPUTS
MR S1 S0 OE1 OE2
L XX H X
L XX X H
L HH X X
L LX L L
L XL L L
H LH X X
H LH L L
H HL X X
H HL L L
H HH X X
H LL HX
H LL XH
H LL
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
L
L
FUNCTION TABLE
RESPONSE
CP DS0 DS7
X
X
X
X
X
X
Asynchronous Reset; Q0 = Q7 = LOW
I/O Voltage Undetermined
XXX
X X X Asynchronous Reset; Q0 = Q7 = LOW
X X X I/O Voltage LOW
D X Shift Right; D Q0; Q0 Q1; etc.
D X Shift Right; D Q0 & I/O0; Q0 O1 & I/O1; etc.
X D Shift Left; D Q7; Q7 Q6; etc.
X D Shift Left; D Q7 & I/O7; Q7 Q6 & I/O6; etc.
X X Parallel Load; I/On Qn
X X X Hold: I/O Voltage undetermined
XXX
X X X Hold: I/On = Qn
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA Operating Ambient Temperature Range
IOH
Output Current — High
Q0, Q7
IOL
Output Current — Low
Q0, Q7
Q0, Q7
IOH
Output Current — High
I/O0 – I/O7
I/O0 – I/O7
IOL
Output Current — Low
I/O0 – I/O7
I/O0 – I/O7
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
54
– 1.0
mA
74 – 2.6
54 12 mA
74 24
FAST AND LS TTL DATA
5-480
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SN54 / 74LS299
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
VIL Input LOW Voltage
54
74
0.7 Guaranteed Input LOW Voltage for
0.8 V All Inputs
VIK
VOH
Input Clamp Diode Voltage
Output HIGH Voltage
I/O0 – I/O7
54
74
– 0.65 – 1.5
2.4 3.2
2.4 3.1
V VCC = MIN, IIN = – 18 mA
V
VCC = MIN, IOH = MAX
V
VOH
Output HIGH Voltage
Q0, Q7
54 2.5 3.4
74 2.7 3.4
V
V VCC = MIN, IOH = MAX
VOL
Output LOW Voltage
I/O0 – I/O7
54, 74
74
0.25 0.4
0.35 0.5
V IOL = 12 mA
V IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VOL
Output LOW Voltage
I/O0 – I/O7
54, 74
74
0.4
V IOL = 4.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
0.5
V IOL = 8.0 mA
per Truth Table
IOZH
Output Off Current HIGH
I/O0 – I/O7
40 µA VCC = MAX, VOUT = 2.7 V
IOZL
Output Off Current LOW
I/O0 – I/O7
– 400 µA VCC = MAX, VOUT = 0.4 V
Others
S0, S1,
I/O0 – I/O7
IIH
Input HIGH Current
Others
S0, S1
20 µA
VCC = MAX, VIN = 2.7 V
40 µA
0.1 mA
VCC = MAX, VIN = 7.0 V
0.2 mA
I/O0 – I/O7
0.1 mA VCC = MAX, VIN = 5.5 V
Others
IIL
Input LOW Current
S0, S1
– 0.4
– 0.8
mA
mA VCC = MAX, VIN = 0.4 V
IOS Short Circuit Current Q0, Q7
– 20
(Note 1)
I/O0 – I/O7
– 30
–100 mA VCC = MAX
–130 mA VCC = MAX
ICC Power Supply Current
53
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
5-481
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