MC54/74F378
PARALLEL D REGISTER
WITH ENABLE
The MC54/74F378 is a 6-bit register with a buffered common enable. This
device is similar to the F174 but with common Enable rather than common
Master Reset.
The F378 consists of six edge-triggered D-type flip-flops with individual D
inputs and Q outputs. The Clock (CP) and Enable (E) inputs are common to
all flip-flops.
When the E input is LOW, new data is entered into the register on the LOW-
to-HIGH transition of the CP input. When the E input is HIGH the register will
retain the present data independent of the CP input. This circuit is designed
to prevent false clocking by transitions on the E input..
PARALLEL D REGISTER
WITH ENABLE
FAST™ SCHOTTKY TTL
•
•
•
•
6-Bit High-Speed Parallel Register
Positive Edge-Triggered D-Type Inputs
Fully Buffered Common Clock and Enable Inputs
Input Clamp Diodes Limit High-Speed Termination Effects
CONNECTION DIAGRAM
(TOP VIEW)
VCC
16
Q5
15
D5
14
D4
13
Q4
12
D3
11
Q3
10
CP
9
J SUFFIX
CERAMIC
CASE 620-09
16
1
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
1
E
2
Q0
3
D0
4
D1
5
Q1
6
D2
7
Q2
8
GND
ORDERING INFORMATION
MC54FXXXJ
MC74FXXXN
MC74FXXXD
Ceramic
Plastic
SOIC
FUNCTION TABLE
Inputs
E
H
L
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
Output
Dn
X
H
L
Qn
No Change
H
L
CP
LOGIC SYMBOL
14
13
11
6
4
3
1
D5
D4
D3
D2
D1
D0
E
Q5
Q4
Q3
Q2
Q1
Q0
CP
9
15
12
10
7
5
2
VCC = PIN 16
GND = PIN 8
FAST AND LS TTL DATA
4-173
MC54/74F378
LOGIC DIAGRAM
D0
CP
D1
D2
D3
D4
D5
CP
E
D
Q
CP
E
D
Q
CP
E
D
Q
CP
E
D
Q
CP
E
D
Q
CP
E
D
Q
E
Q0
Q1
Q2
Q3
Q4
Q5
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
0.5
20
0.1
IIL
IOS
ICC
Input LOW Current
Output Short Circuit Current (Note 2)
Power Supply Current
– 60
30
–0.6
–150
45
Min
2.0
0.8
–1.2
Typ
Max
Unit
V
V
V
V
V
V
µA
mA
mA
mA
mA
Test Conditions
Guaranteed Input HIGH Voltage
Guaranteed Input LOW Voltage
VCC = MIN, IIN = –18 mA
IOL = – 1.0 mA
IOL = – 1.0 mA
IOL = 20 mA
VCC = 4.50 V
VCC = 4.75 V
VCC = MIN
VCC = MAX, VIN = 2.7 V
VCC = MAX, VIN = 7.0 V
VCC = MAX, VIN = 0.5 V
VCC = MAX, VOUT = 0 V
VCC = MAX, VCP = 0 V
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
4-174
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