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DM7446A, DM7447A BCD to 7-Segment Decoders/Drivers September 1986 Revised July 2001 DM7446A, DM7447A BCD to 7-Segment Decoders/Drivers General Description The DM7446A and DM7447A feature active-LOW outputs designed for driving common-anode LEDs or incandescent indicators directly. All of the circuits have full ripple-blanking input/output controls and a lamp test input. Segment identification and resultant displays are shown on a following page. Display patterns for BCD input counts above nine are unique symbols to authenticate input conditions. All of the circuits incorporate automatic leading and/or trailing-edge, zero-blanking control (RBI and RBO). Lamp test (LT) of these devices may be performed at any time when the BI/RBO node is at a HIGH logic level. All types contain an overriding blanking input (BI) which can be used to control the lamp intensity (by pulsing) or to inhibit the outputs. Features s All circuit types feature lamp intensity modulation capability s Open-collector outputs drive indicators directly s Lamp-test provision s Leading/trailing zero suppression Ordering Code: Order Number DM7446AN DM7447AN Package Number Package Description N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Connection Diagram © 2001 Fairchild Semiconductor Corporation DS006518 www.fairchildsemi.com DM7446A, DM7447A Function Table Decimal or Inputs BI/RBO Outputs Note Function LT RBI D C B A (Note 1) a b c d e f g 0 HHL L L L H L L L L L LH 1 HXL L LH H HL LHHHH 2 HXL LHL H L LHL LHL 3 HX L LHH H L L L LHHL 4 HXLHL L H HL LHH L L 5 HX L H L H H LHLLHLL 6 HX LHHL H HH L L L L L 7 HX LHHH H L L L H H H H (Note 2) 8 HXHL L L H LLLLLLL 9 HXHL LH H L L LHH L L 10 HXHLHL H HHHL LHL 11 HXH L HH H HH L LHHL 12 HXHH L L H HLHHH L L 13 HXHH LH H LHHLHL L 14 HX HHH L H HHHL L L L 15 HXHHHH H HHHHHHH BI XXXXXX L H H H H H H H (Note 3) RBI HL L L L L L H H H H H H H (Note 4) LT LXXXXX H L L L L L L L (Note 5) H = HIGH level, L = LOW level, X = Don’t Care Note 1: BI/RBO is a wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO). Note 2: The blanking input (BI) must be OPEN or held at a HIGH logic level when output functions 0 through 15 are desired. The ripple-blanking input (RBI) must be OPEN or HIGH if blanking of a decimal zero is not desired. Note 3: When a LOW logic level is applied directly to the blanking input (BI), all segment outputs are HIGH regardless of the level of any other input. Note 4: When ripple-blanking input (RBI) and inputs A, B, C, and D are at a LOW level with the lamp test input HIGH, all segment outputs go H and the ripple-blanking output (RBO) goes to a LOW level (response condition). Note 5: When the blanking input/ripple-blanking output (BI/RBO) is OPEN or held HIGH and a LOW is applied to the lamp-test input, all segment outputs are L. Logic Diagram www.fairchildsemi.com 2 DM7446A, DM7447A Absolute Maximum Ratings(Note 6) Supply Voltage 7V Input Voltage 5.5V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Note 6: 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 tables 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 DM7446A VCC VIH VIL VOH IOH IOL IOL TA DM7447A VCC VIH VIL VOH IOH IOL IOL TA Parameter Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage (a thru g) HIGH Level Output Current (BI/RBO) LOW Level Output Current (a thru g) LOW Level Output Current (BI/RBO) Free Air Operating Temperature Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage (a thru g) HIGH Level Output Current (BI/RBO) LOW Level Output Current (a thru g) LOW Level Output Current (BI/RBO) Free Air Operating Temperature Min 4.75 2 0 4.75 2 0 Nom 5 5 Max 5.25 0.8 30 −0.2 40 8 70 5.25 0.8 15 −0.2 40 8 70 Units V V V V µA mA mA °C V V V V µA mA mA °C 3 www.fairchildsemi.com DM7446A, DM7447A DM7446A Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions VI Input Clamp Voltage VOH HIGH Level Output Voltage (BI/RBO) ICEX HIGH Level Output Current (a thru g) VOL LOW Level Output Voltage II Input Current @ Max Input Voltage VCC = Min, II = −12 mA VCC = Min IOH = Max VCC = Max, VO = 30V VIL = Max, VIH = Min VCC = Min, IOL = Max VIH = Min, VIL = Max VCC = Max, VI = 5.5V (Except BI/RBO) IIH HIGH Level Input Current VCC = Max, VI = 2.4V (Except BI/RBO) IIL LOW Level Input Current IOS Short Circuit Output Current VCC = Max VI = 0.4V VCC = Max (BI/RBO) ICC Supply Current VCC = Max (Note 8) Note 7: All typicals are at VCC = 5V, TA = 25°C. Note 8: ICC is measured with all outputs OPEN and all inputs at 4.5V. BI/RBO Others DM7446A Switching Characteristics at VCC = 5V and TA = 25°C Symbol Parameter tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output CL = 15 pF RL = 120Ω Conditions Typ Min Max (Note 7) −1.5 2.4 3.7 Units V V 250 µA 0.3 0.4 V 1 mA 40 µA −4 mA −1.6 −4 mA 60 103 mA Min Max Units 100 ns 100 ns www.fairchildsemi.com 4 DM7446A, DM7447A DM7447A Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions VI Input Clamp Voltage VOH HIGH Level Output Voltage (BI/RBO) ICEX HIGH Level Output Current (a thru g) VOL LOW Level Output Voltage II Input Current @ Max Input Voltage VCC = Min, II = −12 mA VCC = Min IOH = Max VCC = Max, VO = 15V VIL = Max, VIH = Min VCC = Min, IOL = Max VIH = Min, VIL = Max VCC = Max, VI = 5.5V IIH HIGH Level Input Current VCC = Max, VI = 2.4V IIL LOW Level Input VCC = Max Current VI = 0.4V IOS Short Circuit VCC = Max Output Current (BI/RBO) ICC Supply Current VCC = Max (Note 10) Note 9: All typicals are at VCC = 5V, TA = 25°C. Note 10: ICC is measured with all outputs OPEN and all inputs at 4.5V. BI/RBO Others DM7447A Switching Characteristics at VCC = 5V and TA = 25°C Symbol Parameter tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output CL = 15 pF RL = 120Ω Conditions Typ Min Max (Note 9) −1.5 2.4 3.7 250 0.3 0.4 1 40 −4 −1.6 −4 60 103 Units V V µA V mA µA mA mA mA Min Max Units 100 ns 100 ns 5 www.fairchildsemi.com DM7446A, DM7447A BCD to 7-Segment Decoders/Drivers Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N16E Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD’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 FAIRCHILD 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 (c) 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. 2. A critical component in 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. www.fairchildsemi.com www.fairchildsemi.com 6

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