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National Semiconductor Electronic Components Datasheet

74AC378 Datasheet

Parallel D Register

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74AC378 pdf
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March 1993
54AC 74AC378
Parallel D Register with Enable
General Description
The ’AC378 is a 6-bit register with a buffered common En-
able This device is similar to the ’AC174 but with common
Enable rather than common Master Reset
Features
Y 6-bit high-speed parallel register
Y Positive edge-triggered D-type inputs
Y Fully buffered common clock and enable inputs
Y Input clamp diodes limit high-speed termination effects
Y Standard Military Drawing (SMD)
’AC378 5962-91605
Logic Symbols
Connection Diagrams
Pin Assignment for
DIP SOIC and Flatpak
Pin Assignment
for LCC
TL F 10231–1
IEEE IEC
TL F 10231 – 2
TL F 10231 – 3
TL F 10231–4
Pin Names
E
D0 – D5
CP
Q0 – Q5
Description
Enable Input (Active LOW)
Data Inputs
Clock Pulse Input (Active Rising Edge)
Outputs
FACTTM is a trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 10231
RRD-B30M75 Printed in U S A



National Semiconductor Electronic Components Datasheet

74AC378 Datasheet

Parallel D Register

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74AC378 pdf
Functional Description
The ’AC378 consists of six edge-triggered D-type flip-flops
with individual D inputs and Q inputs 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
Logic Diagram
Truth Table
Inputs
E CP Dn
HLX
L LH
LLL
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
L e LOW-to-HIGH Clock Transition
Output
Qn
No Change
H
L
TL F 10231 – 5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
2



National Semiconductor Electronic Components Datasheet

74AC378 Datasheet

Parallel D Register

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74AC378 pdf
Absolute Maximum Ratings (Note 1)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage (VCC)
DC Input Diode Current (IIK)
VI e b0 5V
VI e VCC a 0 5V
DC Input Voltage (VI)
DC Output Diode Current (IOK)
VO e b0 5V
VO e VCC a 0 5V
DC Output Voltage (VO)
DC Output Source
or Sink Current (IO)
DC VCC or Ground Current
per Output Pin (ICC or IGND)
Storage Temperature (TSTG)
Junction Temperature (TJ)
CDIP
PDIP
b0 5V to a7 0V
b20 mA
a20 mA
b0 5V to VCC a 0 5V
b20 mA
a20 mA
b0 5V to VCC a 0 5V
g50 mA
g50 mA
b65 C to a150 C
175 C
140 C
Note 1 Absolute maximum ratings are those values beyond which damage
to the device may occur The databook specifications should be met without
exception to ensure that the system design is reliable over its power supply
temperature and output input loading variables National does not recom-
mend operation of FACTTM circuits outside databook specifications
Recommended Operating
Conditions
Supply Voltage (VCC)
’AC
2 0V to 6 0V
Input Voltage (VI)
Output Voltage (VO)
Operating Temperature (TA)
74AC
54AC
0V to VCC
0V to VCC
b40 C to a85 C
b55 C to a125 C
Minimum Input Edge Rate (DV Dt)
’AC Devices
VIN from 30% to 70% of VCC
VCC 3 3V 4 5V 5 5V
125 mV ns
DC Characteristics for ’AC Family Devices
Symbol
Parameter
VCC
(V)
VIH Minimum High Level 3 0
Input Voltage
45
55
VIL Maximum Low Level 3 0
Input Voltage
45
55
VOH Minimum High Level 3 0
Output Voltage
45
55
74AC
TA e a25 C
Typ
15
2 25
2 75
15
2 25
2 75
2 99
4 49
5 49
21
3 15
3 85
09
1 35
1 65
29
44
54
54AC
74AC
TA e
TA e
b55 C to a125 C b40 C to a85 C
Guaranteed Limits
21 21
3 15 3 15
3 85 3 85
09 09
1 35 1 35
1 65 1 65
29 29
44 44
54 54
3 0 2 56
4 5 3 86
5 5 4 86
VOL Maximum Low Level 3 0 0 002 0 1
Output Voltage
4 5 0 001 0 1
5 5 0 001 0 1
24
37
47
01
01
01
2 46
3 76
4 76
01
01
01
3 0 0 36
4 5 0 36
5 5 0 36
IIN
Maximum Input
Leakage Current
55
g0 1
All outputs loaded thresholds on input associated with output under test
05
05
05
g1 0
0 44
0 44
0 44
g1 0
Units
V
V
V
V
V
V
mA
Conditions
VOUT e 0 1V
or VCC b 0 1V
VOUT e 0 1V
or VCC b 0 1V
IOUT e b50 mA
VIN e VIL or VIH
b12 mA
IOH b24 mA
b24 mA
IOUT e 50 mA
VIN e VIL or VIH
12 mA
IOL 24 mA
24 mA
VI e VCC GND
3




Part Number 74AC378
Description Parallel D Register
Maker National Semiconductor
Total Page 8 Pages
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