MC54/74F398
QUAD 2-PORT REGISTER
The MC54/74F398 is the logical equivalent of a quad 2-input multiplexer
feeding into four edge-triggered flip-flops. A common Select input determines
which of the two 4-bit words is accepted. The selected data enters the flip-
flops on the rising edge of the clock.
•
Select Inputs from Two Data Sources
•
Fully Positive Edge-Triggered Operation
•
Both True and Complement Outputs
CONNECTION DIAGRAM
(TOP VIEW)
VCC
20
Qd
19
Qd
18
I0d
17
I1d
16
I1c
15
I0c
14
Qc
13
Qc
12
CP
11
20
QUAD 2-PORT REGISTER
FAST™ SCHOTTKY TTL
J SUFFIX
CERAMIC
CASE 732-03
1
1
S
2
Qa
3
Qa
4
I0a
5
I1a
6
I1b
7
I0b
8
Qb
9
Qb
10
GND
20
1
N SUFFIX
PLASTIC
CASE 738-03
LOGIC DIAGRAM
20
I0a
S
I1a
D
CP
Qa
Qa
DW SUFFIX
SOIC
CASE 751D-03
1
ORDERING INFORMATION
MC54FXXXJ
Ceramic
MC74FXXXN Plastic
MC74FXXXDW SOIC
I0b
D
I1b
CP
Qb
Qb
LOGIC SYMBOL
I0c
D
I1c
CP
Qc
Qc
1
I0d
D
I1d
CP
Qd
Qd
11
S
CP
I0a I1a I0b I1b I0c I1c I0d I1d
4
5 7 6 14 15 17 16
Qa Qa Qb Qb Qc Qc Qd Qd
2
3 9 8 12 13 19 18
CP
NOTES:
This diagram is provided only for the understanding of logic operations and
should not be used to estimate propagation delays.
VCC = PIN 20
GND = PIN 10
FAST AND LS TTL DATA
4-189
MC54/74F398
FUNCTIONAL DESCRIPTION
The MC54/74F398 is a high-speed quad 2-port register. It
will select four bits of data from either of two sources (Ports)
under 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 input (CP). The 4-bit D-
FUNCTION TABLE
Inputs
S
I
I
h
h
I0
I
h
X
X
I1
X
X
I
h
Outputs
Q
L
H
L
H
Q
H
L
H
L
type output register is fully edge-triggered. The Data inputs
(I0x, I1x) and Select input (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 MC54/74F398 has
both Q and Q outputs.
H = HIGH Voltage Level
L = LOW Voltage Level
h = HIGH Voltage Level one setup time prior to the LOW-to-HIGH clock transition
I = LOW Voltage Level; one setup time prior to the LOW-to-HIGH clock transition
X = Don’t Care
GUARANTEED OPERATING RANGES
Symbol
VCC
TA
Supply Voltage
Operating Ambient Temperature Range
Parameter
54, 74
54
74
IOH
IOL
Output Current – High
Output Current – Low
54, 74
54, 74
Min
4.5
–55
0
Typ
5.0
25
25
Max
5.5
125
70
–1.0
20
mA
mA
Unit
V
°C
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
VIH
VIL
VIK
VOH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
54, 74
74
VOL
IIH
Output LOW Voltage
Input HIGH Current
2.5
2.7
3.4
3.4
0.35
0.5
20
100
IIL
IOS
ICC
Input LOW Current
Output Short Circuit Current (Note 2)
Power Supply Current
–60
25
–0.6
–150
38
Min
2.0
0.8
–1.2
Typ
Max
Unit
V
V
V
V
V
V
µA
µA
mA
mA
mA
Test Conditions
Guaranteed Input HIGH Voltage
Guaranteed Input LOW Voltage
IIN = –18 mA
IOH = – 1.0 mA
IOH = – 1.0 mA
IOL = 20 mA
VIN = 2.7 V
VIN = 7.0 V
VIN = 0.5 V
VOUT = 0 V
VCC = MAX
VCC = MAX
VCC = MAX
VIN = GND
CP =
VCC = MIN
VCC = 4.5 V
VCC = 4.75 V
VCC = MIN
VCC = MAX
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
4-190
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