4-192
FAST AND LS TTL DATA
QUAD 2-PORT REGISTER
The MC54/74F399 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. The MC54/74F399 is the 16-pin version
of the MC54/74F398, with only the Q outputs of the flip-flops available.
•
Select Inputs from Two Data Sources
•
Fully Positive Edge-Triggered Operation
6
7
8
1
2
3
4
5
10
11
13
14
12
9
15
16
VCC
Qd
I0d
I1d
I1c
Qc
I0c
I0a
S
Qa
I1a
I1b
Qb
I0b
CONNECTION DIAGRAM (TOP VIEW)
CP
GND
LOGIC DIAGRAM
NOTE:
This diagram is provided only for the understanding of logic operations and
should not be used to estimate propagation delays.
D
CP
Qa
Qb
Qc
Qd
I0a
S
I1a
I0b
I1b
I0c
I1c
I0d
I1d
CP
D
CP
D
CP
D
CP
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
ORDERING INFORMATION
MC54FXXXJ
Ceramic
MC74FXXXN
Plastic
MC74FXXXD
SOIC
16
1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
QUAD 2-PORT REGISTER
FAST
™
SCHOTTKY TTL
MC54/74F399
I0a I1a I0b I1b I0c I1c I0d I1d
S
CP
Qa
Qb
Qc
Qd
3
4
6
5 11 12 14 13
2
7
10
15
1
9
VCC = PIN 16
GND = PIN 8
4-193
FAST AND LS TTL DATA
MC54/74F399
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-
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.
Inputs
Output
S
I0
I1
Q
I
I
h
h
I
h
X
X
X
X
I
h
L
H
L
H
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
FUNCTION TABLE
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54, 74
4.5
5.0
5.5
V
TA
Operating Ambient Temperature Range
54
–55
25
125
°
C
74
0
25
70
IOH
Output Current
High
54, 74
– 1.0
mA
IOL
Output Current
Low
54, 74
20
mA
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
VIL
Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage
VIK
Input Clamp Diode Voltage
–1.2
V
IIN = –18 mA
VCC = MIN
VOH
Output HIGH Voltage
54, 74
2.5
3.4
V
IOH = – 1.0 mA
VCC = 4.5 V
74
2.7
3.4
V
IOH = – 1.0 mA
VCC = 4.75 V
VOL
Output LOW Voltage
0.35
0.5
V
IOL = 20 mA
VCC = MIN
IIH
Input HIGH Current
20
µ
A
VIN = 2.7 V
VCC = MAX
100
µ
A
VIN = 7.0 V
IIL
Input LOW Current
–0.6
mA
VIN = 0.5 V
VCC = MAX
IOS
Output Short Circuit Current (Note 2)
–60
–150
mA
VOUT = 0 V
VCC = MAX
ICC
Power Supply Current
22
34
mA
VCC = MAX
VIN = GND
CP =
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.
