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54AC 74AC378 Parallel D Register with Enable
March 1993
54AC 74AC378 Parallel D Register with Enable
General Description
The ’AC378 is a 6-bit register with a buffered common Enable This device is similar to the ’AC174 but with common Enable rather than common Master Reset
Features
Y Y Y Y Y
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 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 TL F 10231 – 3
IEEE IEC
TL F 10231 – 2
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
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
Truth Table
Inputs E H L L CP L L L Dn X H L Output Qn No Change H L
H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial L e LOW-to-HIGH Clock Transition
Logic Diagram
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
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
b 0 5V to a 7 0V b 20 mA a 20 mA b 0 5V to VCC a 0 5V b 20 mA a 20 mA b 0 5V to VCC a 0 5V
g 50 mA g 50 mA
Recommended Operating Conditions
Supply Voltage (VCC) ’AC Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) 74AC 54AC Minimum Input Edge Rate (DV Dt) ’AC Devices VIN from 30% to 70% of VCC VCC 3 3V 4 5V 5 5V 2 0V to 6 0V 0V to VCC 0V to VCC
b 40 C to a 85 C b 55 C to a 125 C
125 mV ns
b 65 C to a 150 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 recommend operation of FACT TM circuits outside databook specifications
DC Characteristics for ’AC Family Devices
74AC Symbol Parameter VCC (V) TA e a 25 C Typ VIH Minimum High Level Input Voltage Maximum Low Level Input Voltage Minimum High Level Output Voltage 30 45 55 30 45 55 30 45 55 30 45 55 VOL Maximum Low Level Output Voltage 30 45 55 30 45 55 IIN Maximum Input Leakage Current 55 0 002 0 001 0 001 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 2 56 3 86 4 86 01 01 01 0 36 0 36 0 36
g0 1
54AC TA e b 55 C to a 125 C
74AC TA e b 40 C to a 85 C Units Conditions
Guaranteed Limits 21 3 15 3 85 09 1 35 1 65 29 44 54 24 37 47 01 01 01 05 05 05
g1 0
21 3 15 3 85 09 1 35 1 65 29 44 54 2 46 3 76 4 76 01 01 01 0 44 0 44 0 44
g1 0
V
VOUT e 0 1V or VCC b 0 1V VOUT e 0 1V or VCC b 0 1V IOUT e b50 mA
VIL
V
VOH
V VIN e VIL or VIH b 12 mA b 24 mA IOH b 24 mA IOUT e 50 mA V VIN e VIL or VIH 12 mA 24 mA IOL 24 mA VI e VCC GND
V
V
mA
All outputs loaded thresholds on input associated with output under test
3
DC Characteristics for ’AC Family Devices (Continued)
74AC Symbol Parameter VCC (V) TA e a 25 C Typ IOLD IOHD ICC Minimum Dynamic Output Current Maximum Quiescent Supply Current 55 55 55 40 54AC TA e b 55 C to a 125 C 74AC TA e b 40 C to a 85 C Units Conditions
Guaranteed Limits 50
b 50
75
b 75
mA mA mA
VOLD e 1 65V Max VOHD e 3 85V Min VIN e VCC or GND
80 0
40 0
Maximum test duration 2 0 ms one output loaded at a time Note IIN and ICC 3 0V are guaranteed to be less than or equal to the respective limit ICC for 54AC 25 C is identical to 74AC 25 C 5 5V VCC
AC Electrical Characteristics
74AC Symbol Parameter VCC (V) Min fmax tPLH tPHL Maximum Clock Frequency Propagation Delay CP to Qn Propagation Delay CP to Qn 33 50 33 50 33 50 125 160 25 15 25 15 TA e a 25 C CL e 50 pF Typ 160 200 85 60 80 55 11 0 80 10 5 75 Max 54AC TA e b55 C to a 125 C CL e 50 pF Min 95 95 15 15 15 15 12 0 90 12 0 90 Max 74AC TA e b40 C to a 85 C CL e 50 pF Min 110 145 25 15 25 15 12 5 90 11 0 80 Max MHz ns ns Units
Voltage Range 3 3 is 3 3V g 0 3V Voltage Range 5 0 is 5 0V g 0 5V
AC Operating Requirements
74AC Symbol Parameter VCC (V) TA e a 25 C CL e 50 pF Typ ts th ts th tw Setup Time HIGH or LOW Dn to CP Hold Time HIGH or LOW Dn to CP Setup Time HIGH or LOW E to CP Hold Time HIGH or LOW E to CP CP Pulse Width HIGH or LOW 33 50 33 50 33 50 33 50 33 50 15 10 10 10 0 0 10 10 30 20 30 20 20 20 20 20 20 20 45 35 54AC TA e b55 C to a 125 C CL e 50 pF 40 40 40 40 25 25 40 40 65 65 74AC TA e b40 C to a 85 C CL e 50 pF 35 25 20 20 20 20 20 20 55 40 Units
Guaranteed Minimum ns ns ns ns ns
Voltage Range 3 3 is 3 3V g 0 3V Voltage Range 5 0 is 5 0V g 0 5V
Capacitance
Symbol CIN CPD Parameter Input Capacitance Power Dissipation Capacitance Typ 45 28 Units pF pF Conditions VCC e OPEN VCC e 5 0V
4
Ordering Information
The device number is used to form part of a simplified purchasing code where a package type and temperature range are defined as follows 74AC Temperature Range Family 74AC e Commercial 54AC e Military Device Type Package Code P e Plastic DIP D e Ceramic DIP F e Flatpak L e Leadless Ceramic Chip Carrier (LCC) S e Small Outline (SOIC) 378 P C QR Special Variations X e Devices shipped in 13 reels QR e Commercial grade device with burn-in QB e Military grade with environmental and burn-in processing shipped in tubes Temperature Range C e Commercial (b40 C to a 85 C) M e Military (b55 C to a 125 C)
5
Physical Dimensions inches (millimeters)
20-Terminal Ceramic Leadless Chip Carrier (L) NS Package Number E20A
16-Lead Ceramic Dual-In-Line Package (D) NS Package Number J16A
6
Physical Dimensions inches (millimeters) (Continued)
16-Lead Small Outline Integrated Circuit (S) NS Package Number M16A
16-Lead Plastic Dual-In-Line Package (P) NS Package Number N16E
7
54AC 74AC378 Parallel D Register with Enable
Physical Dimensions inches (millimeters) (Continued)
Lit
114805
16-Lead Ceramic Flatpak (F) NS Package Number W16A
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