Revised February 2000 DM7446A, DM7447A BCD to 7-Segment Decoders/Drivers General Description Features 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 circuit types feature lamp intensity modulation capability ■ Open-collector outputs drive indicators directly ■ Lamp-test provision ■ Leading/trailing zero suppression 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. Ordering Code: Order Number Package Number Package Description DM7446AN N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM7446AN N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Connection Diagram © 2000 Fairchild Semiconductor Corporation DS006518 www.fairchildsemi.com DM7446A, DM7447A BCD to 7-Segment Decoders/Drivers September 1986 DM7446A, DM7447A Function Table Decimal or Inputs BI/RBO A (Note 1) Outputs Function LT RBI D C B a b c d e f g 0 H H L L L L H L L L L L L H 1 H X L L L H H H L L H H H H 2 H X L L H L H L L H L L H L 3 H X L L H H H L L L L H H L 4 H X L H L L H H L L H H L L 5 H X L H L H H L H L L H L L 6 H X L H H L H H H L L L L L 7 H X L H H H H L L L H H H H 8 H X H L L L H L L L L L L L 9 H X H L L H H L L L H H L L 10 H X H L H L H H H H L L H L 11 H X H L H H H H H L L H H L 12 H X H H L L H H L H H H L L 13 H X H H L H H L H H L H L L 14 H X H H H L H H H H L L L L 15 H X H H H H H H H H H H H H Note (Note 2) BI X X X X X X L H H H H H H H (Note 3) RBI H L L L L L L H H H H H H H (Note 4) LT L X X X X X 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 Supply Voltage 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. 7V Input Voltage 5.5V Operating Free Air Temperature Range Storage Temperature Range 0°C to +70°C −65°C to +150°C Recommended Operating Conditions Symbol Parameter Min Nom Max Units 4.75 5 5.25 V 0.8 V DM7446A VCC Supply Voltage VIH HIGH Level Input Voltage VIL LOW Level Input Voltage VOH HIGH Level Output Voltage (a thru g) 30 V IOH HIGH Level Output Current (BI/RBO) −0.2 µA IOL LOW Level Output Current (a thru g) 40 mA IOL LOW Level Output Current (BI/RBO) 8 mA TA Free Air Operating Temperature 70 °C 5.25 V 0.8 V 2 V 0 DM7447A VCC Supply Voltage VIH HIGH Level Input Voltage 4.75 5 VIL LOW Level Input Voltage VOH HIGH Level Output Voltage (a thru g) 15 V IOH HIGH Level Output Current (BI/RBO) −0.2 µA IOL LOW Level Output Current (a thru g) 40 mA IOL LOW Level Output Current (BI/RBO) 8 mA TA Free Air Operating Temperature 70 °C 2 0 3 V www.fairchildsemi.com DM7446A, DM7447A Absolute Maximum Ratings(Note 6) DM7446A, DM7447A DM7446A Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions VI Input Clamp Voltage VCC = Min, II = −12 mA VOH HIGH Level Output VCC = Min Voltage (BI/RBO) IOH = Max HIGH Level Output VCC = Max, VO = 30V Current (a thru g) VIL = Max, VIH = Min ICEX VOL II IIH IIL IOS ICC Min 2.4 LOW Level VCC = Min, IOL = Max Output Voltage VIH = Min, VIL = Max Input Current @ Max VCC = Max, VI = 5.5V Input Voltage (Except BI/RBO) Typ (Note 7) Max Units −1.5 V 3.7 0.3 V 250 µA 0.4 V 1 mA 40 µA HIGH Level Input VCC = Max, VI = 2.4V Current (Except BI/RBO) LOW Level Input VCC = Max BI/RBO −4 Current VI = 0.4V Others −1.6 Short Circuit VCC = Max Output Current (BI/RBO) VCC = Max Supply Current (Note 8) mA −4 mA 60 103 mA Min Max Units 100 ns 100 ns 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. DM7446A Switching Characteristics at VCC = 5V and TA = 25°C Symbol tPLH tPHL Parameter Conditions Propagation Delay Time CL = 15 pF LOW-to-HIGH Level Output RL = 120Ω Propagation Delay Time HIGH-to-LOW Level Output www.fairchildsemi.com 4 over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions VI Input Clamp Voltage VCC = Min, II = −12 mA VOH HIGH Level Output VCC = Min Voltage (BI/RBO) IOH = Max ICEX VOL II Min 2.4 HIGH Level Output VCC = Max, VO = 15V Current (a thru g) VIL = Max, VIH = Min LOW Level Output VCC = Min, IOL = Max Voltage VIH = Min, VIL = Max Input Current @ Max VCC = Max, VI = 5.5V Typ (Note 9) Max Units −1.5 V 3.7 0.3 V 250 µA 0.4 V 1 mA Input Voltage IIH HIGH Level Input Current VCC = Max, VI = 2.4V IIL LOW Level Input VCC = Max BI/RBO −4 Current VI = 0.4V Others −1.6 Short Circuit VCC = Max Output Current (BI/RBO) Supply Current VCC = Max IOS ICC 40 (Note 10) µA mA −4 mA 60 103 mA Min Max Units 100 ns 100 ns 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. DM7447A Switching Characteristics at VCC = 5V and TA = 25°C Symbol tPLH tPHL Parameter Conditions Propagation Delay Time CL = 15 pF LOW-to-HIGH Level Output RL = 120Ω Propagation Delay Time HIGH-to-LOW Level Output 5 www.fairchildsemi.com DM7446A, DM7447A DM7447A Electrical Characteristics 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: 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. 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. www.fairchildsemi.com www.fairchildsemi.com 6