2-PORT REGISTER. SN54LS398 Datasheet

SN54LS398 REGISTER. Datasheet pdf. Equivalent

SN54LS398 Datasheet
Recommendation SN54LS398 Datasheet
Part SN54LS398
Description QUAD 2-PORT REGISTER
Feature SN54LS398; QUAD 2-PORT REGISTER The SN54 / 74LS398 and SN54 / 74LS399 are Quad 2-Port Registers. They are the l.
Manufacture Motorola Inc
Datasheet
Download SN54LS398 Datasheet




Motorola  Inc SN54LS398
QUAD 2-PORT REGISTER
The SN54 / 74LS398 and SN54 / 74LS399 are Quad 2-Port Registers. They
are the logical equivalent of a quad 2-input multiplexer followed by a quad 4-bit
edge-triggered register. A Common Select input selects between two 4-bit in-
put ports (data sources). The selected data is transferred to the output register
on the LOW-to-HIGH transition of the Clock input. The SN54/ 74LS398 fea-
tures both Q and Q inputs, while the SN54/ 74LS399 has only Q outputs.
Select From Two Data Sources
Fully Positive Edge-Triggered Operation
Both True and Complemented Outputs on SN54/ 74LS398
Input Clamp Diodes Limit High-Speed Termination Effects
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC Qd Qd Iod I1d I1c I0c Qc Qc CP
20 19 18 17 16 15 14 13 12 11
SN54 / 74LS398
1 2 3 4 5 6 7 8 9 10
S Qa Qa I0a I1a I1b I0b Qb Qb GND
VCC = PIN 20
GND = PIN 10
VCC Qd I0d I1d I1c I0c Qc CP
16 15 14 13 12 11 10 9
SN54 / 74LS399
1 2 3 4 56
78
S Qa I0a I1a I1b I0b Qb GND
VCC = PIN 16
GND = PIN 8
PIN NAMES
LOADING (Note a)
HIGH
LOW
S
CP
I0a – I0d
I1a – I0d
Qa – Qd
Qa – Qd
Common Select Input
Clock (Active HIGH Going Edge) Input
Data Inputs From Source 0
Data Inputs From Source 1
Register True Outputs (Note b)
Register Complementary Outputs
(Note b)
0.5 U.L.
0.5 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
10 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
5 (2.5) U.L.
5 (2.5) 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.
SN54/74LS398
SN54/74LS399
QUAD 2-PORT REGISTER
LOW POWER SCHOTTKY
16
1
16
1
16
1
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
D SUFFIX
SOIC
CASE 751B-03
20
1
20
1
J SUFFIX
CERAMIC
CASE 732-03
N SUFFIX
PLASTIC
CASE 738-03
20
1
DW SUFFIX
SOIC
CASE 751D-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
SN74LSXXXD SOIC
FAST AND LS TTL DATA
5-557



Motorola  Inc SN54LS398
SN54/74LS398 SN54/74LS399
FUNCTIONAL BLOCK DIAGRAM
IOA
S
IIA
IOB
IIB
IOC
IIC
IOD
IID
* SN54 / 74LS398 only
S QA
R * QA
S QB
R * QB
S QC
R * QC
S QD
R * QD
FUNCTIONAL DESCRIPTION
The SN54 / 74LS398 and SN54 / 74LS399 are high-speed
Quad 2-Port Registers. They select four bits of data from two
sources (Ports) under the control of a common Select Input
(S). The selected data is transferred to a 4-Bit Output Register
synchronous with the LOW-to-HIGH transition of the Clock in-
put (CP). The 4-Bit RS type output register is fully edge-trig-
gered. The Data inputs (I) and Select inputs (S) must be stable
only a setup time prior to and hold time after the LOW-to-HIGH
transition of the Clock input for predictable operation. The
SN54 / 74LS398 has both Q and Q Outputs available.
FUNCTION TABLE
INPUTS
OUTPUTS
S I0 I1 Q
I I XL
Q*
H
I h XH
L
hX I L
H
h XhH
*SN54 / 74LS398 only
L
I = LOW Voltage Level one setup time pior to the LOW-to-HIGH clock transition
h = HIGH Voltage Level one setup time prior to the LOW-to-HIGH clock transition
L = LOW Voltage Level
H = HIGH Voltage Level
X = Immaterial
FAST AND LS TTL DATA
5-558



Motorola  Inc SN54LS398
SN54/74LS398 SN54/74LS399
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
2.5 3.5
2.7 3.5
V VCC = MIN, IIN = – 18 mA
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
13
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
mA VCC = MAX
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Limits
Symbol
Parameter
Min Typ Max
tPLH
tPHL
Propagation Delay,
Clock to Output Q
18 27
21 32
Unit
ns
Test Conditions
VCC = 5.0 V
CL = 15 pF
FAST AND LS TTL DATA
5-559







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