54279 DM74279 Quad Set-Reset Latch
June 1989
54279 DM74279 Quad Set-Reset Latch
General Description
This device contains four independent set-reset type flipflops with one Q output each
Connection Diagram
Dual-In-Line Package
TL F 9785 – 1
Order Number 54279DMQB 54279FMQB or DM74279N NS Package Number J16A N16E or W16A
Pin Names Rn Sn Q
Description Reset Inputs (Active Low) Set Inputs (Active Low) Outputs
Truth Table
S1 L L X H H Inputs S2 L X L H H R L H H L H Output Q h H H L No Change
H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial h e The output is HIGH as long as S1 or S2 is LOW If all inputs go HIGH simultaneously the output state is indeterminate otherwise it follows the Truth Table
C1995 National Semiconductor Corporation
TL F 9785
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage 7V Input Voltage 5 5V Operating Free Air Temperature Range b 55 C to a 125 C 54 DM74 0 C to a 70 C b 65 C to a 150 C Storage Temperature Range Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed The device should not be operated at these limits The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation
Recommended Operating Conditions
Symbol VCC VIH VIL IOH IOL TA Parameter Min Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature
b 55
54279 Nom 5 Max 55 Min 4 75 2 08
b0 8
DM74279 Nom 5 Max 5 25
Units V V 08
b0 8
45 2
V mA mA C
16 125 0
16 70
Electrical Characteristics
over Recommended Operating Free Air Temperature Range (Unless Otherwise Noted) Symbol VI VOH VOL II IIH IIL IOS Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Input Current Input Voltage Max Conditions VCC e Min II e b12 mA VCC e Min IOH e Max VIL e Max VCC e Min IOL e Max VIH e Min VCC e Max VI e 5 5V VCC e Max VI e 2 4V VCC e Max VI e 0 4V VCC e Max (Note 2) VCC e Max R e 0V 54 DM74
b 20 b 18
Min
Typ (Note 1)
Max
b1 5
Units V V
24
34 02 04 1 40
b1 6 b 55 b 57
V mA mA mA mA mA
High Level Input Current Low Level Input Current Short Circuit Output Current Supply Current
ICC
30
Switching Characteristics
Symbol tPLH tPHL tPHL Parameter Min Propagation Delay S to Q Propagation Delay R to Q 54 DM74 Max 22 15 27 ns ns Units
Note 1 All typicals are at VCC e 5V TA e 25 C Note 2 Not more than one output should be shorted at a time
2
Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J) Order Number 54279DMQB NS Package Number J16A
16-Lead Molded Dual-In-Line Package (N) Order Number DM74279N NS Package Number N16E
3
54279 DM74279 Quad Set-Reset Latch
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W) Order Number 54279FMQB NS Package Number W16A
LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user
National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018
2 A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness
National Semiconductor Europe Fax (a49) 0-180-530 85 86 Email cnjwge tevm2 nsc com Deutsch Tel (a49) 0-180-530 85 85 English Tel (a49) 0-180-532 78 32 Fran ais Tel (a49) 0-180-532 93 58 Italiano Tel (a49) 0-180-534 16 80
National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel (852) 2737-1600 Fax (852) 2736-9960
National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408
National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications
很抱歉,暂时无法提供与“54279”相匹配的价格&库存,您可以联系我们找货
免费人工找货