DatasheetsPDF.com

DM9374 Dataheets PDF



Part Number DM9374
Manufacturers National Semiconductor
Logo National Semiconductor
Description 7-Segment Decoder/Driver/Latch
Datasheet DM9374 DatasheetDM9374 Datasheet (PDF)

DM9374 7-Segment Decoder Driver Latch with Constant Current Sink Outputs June 1989 DM9374 7-Segment Decoder Driver Latch with Constant Current Sink Outputs General Description The ’74 is a 7-segment decoder driver incorporating input latches and output circuits to directly drive common anode LED displays Connection Diagram Dual-In-Line Package Logic Symbol TL F 10210 – 2 TL F 10210 – 1 VCC e Pin 16 GND e Pin 8 Order Number DM9374N See NS Package Number N16E Pin Names A0–A3 LE RBI RBO a–.

  DM9374   DM9374



Document
DM9374 7-Segment Decoder Driver Latch with Constant Current Sink Outputs June 1989 DM9374 7-Segment Decoder Driver Latch with Constant Current Sink Outputs General Description The ’74 is a 7-segment decoder driver incorporating input latches and output circuits to directly drive common anode LED displays Connection Diagram Dual-In-Line Package Logic Symbol TL F 10210 – 2 TL F 10210 – 1 VCC e Pin 16 GND e Pin 8 Order Number DM9374N See NS Package Number N16E Pin Names A0–A3 LE RBI RBO a– g Description Address (Data Inputs) Latch Enable Input (Active LOW) Ripple Blanking Input (Active LOW) Ripple Blanking as Output (Active LOW) as Input (Active LOW) Constant Current Outputs (Active LOW) C1995 National Semiconductor Corporation TL F 10210 RRD-B30M105 Printed in U S A http://www.Datasheet4U.com 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 Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 5 5V 0 C to a 70 C b 65 C to a 150 C 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 VOUT Supply Voltage Output Voltage Applied OFF ON VIH VIL IOH IOL TA ts (H) ts (L) th (H) th (L) tw (L) High Level Input Voltage Low Level Input Voltage High Level Output Current a– g VOUT e 5 5V Low Level Output Current a– g VOL e 3 0V Free Air Operating Temperature Setup Time HIGH or LOW An to LE Hold Time HIGH or LOW An to LE LE Pulse Width LOW 12 0 75 30 0 0 85 2 08 250 18 70 Parameter Min 4 75 Nom 5 Max 5 25 10 (Figure A) Units V V V V mA mA C ns ns ns Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL II IIH IIL IOS ICCH Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Input Current Max Input Voltage 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 VIN e 0V VOUT e 3 0V b 18 Min Typ (Note 1) Max b1 5 Units V V 24 34 02 04 1 40 b1 6 b 57 V mA mA mA mA mA High Level Input Current Low Level Input Current Short Circuit Output Current Supply Current 50 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 Switching Characteristics VCC e a 5 0V TA e a 25 C (See Section 1 for test waveforms and output load) Symbol Parameter Min tPLH tPHL tPLH tPHL Propagation Delay An to a– g Propagation Delay LE to a– g 2 CL e 15 pF RL e 1 k X Max 140 140 140 140 ns ns Units http://www.Datasheet4U.com TL F 10210 – 10 TL F 10210 – 9 FIGURE A Output Voltage Safe Operating Area FIGURE B Typical Constant Segment Current Versus Output Voltage Functional Description The ’9374 is a 7-segment decoder driver with latches on the address inputs and active LOW constant current outputs to drive LEDs directly This device accepts a 4-bit binary code and produces output drive to the appropriate segments of the 7-segment display It has a decode format which produces numeric codes ‘‘0’’ through ‘‘9’’ and other codes Latches on the four data inputs are controlled by an active LOW Latch Enable LE When LE is LOW the state of the outputs is determined by the input data When LE goes HIGH the last data present at the inputs is stored in the latches and the outputs remain stable The LE pulse width necessary to accept and store data is typically 50 ns which allows data to be strobed into the ’74 at normal TTL speeds This feature means that data can be routed directly from high speed counters and frequency dividers into the display without slowing down the system clock or providing intermediate data storage The latch decoder combination is a simple system which drives LED displays with multiplexed data inputs from MOS time clocks DVMs calculator chips etc Data inputs are multiplexed while the displays are in static mode This lowers component and insertion costs since several circuits seven resistors per display strobe drivers a separate display voltage source and clock failure detect circuits traditionally found in multiplexed display systems are eliminated It also allows low strobing rates to be used without display flicker Another ’74 feature is the reduced loading on the data inputs when the Latch Enable is HIGH (only 10 mA typ) This allows many ’74s to be driven from a MOS device in multiplex mode without the need for drivers on the data lines The ’74 also provides automatic blanking of the leading and.


DM9374 DM9374 2SA1708


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)