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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 N16E N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Connection Diagram
(c) 2001 Fairchild Semiconductor Corporation
DS006518
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DM7446A, DM7447A
Function Table
Decimal or Function 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 BI RBI LT
H = HIGH level,
Inputs LT H H H H H H H H H H H H H H H H X H L RBI H X X X X X X X X X X X X X X X X L X D L L L L L L L L H H H H H H H H X L X C L L L L H H H H L L L L H H H H X L X B L L H H L L H H L L H H L L H H X L X A L H L H L H L H L H L H L H L H X L X
BI/RBO (Note 1) H H H H H H H H H H H H H H H H L L H a L H L L H L H L L L H H H L H H H H L b L L L L L H H L L L H H L H H H H H L c L L H L L L L L L L H L H H H H H H L
Outputs d L H L L H L L H L H L L H L L H H H L e L H L H H H L H L H L H H H L H H H L f L H H H L L L H L L H H L L L H H H L g H H L L L L L H L L L L L L L H H H L
Note
(Note 2)
(Note 3) (Note 4) (Note 5)
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
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2
DM7446A, DM7447A
Absolute Maximum Ratings(Note 6)
Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 5.5V 0C to +70C
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.
-65C to +150C
Recommended Operating Conditions
Symbol DM7446A VCC VIH VIL VOH IOH IOL IOL TA DM7447A VCC VIH VIL VOH IOH IOL IOL TA 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 0 4.75 2 0.8 15 5 5.25 V V V V 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 0 4.75 2 0.8 30 5 5.25 V V V V Parameter Min Nom Max Units
-0.2
40 8 70
A
mA mA
C
-0.2
40 8 70
A
mA mA
C
3
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DM7446A, DM7447A
DM7446A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH ICEX VOL II IIH IIL IOS ICC Parameter Input Clamp Voltage HIGH Level Output Voltage (BI/RBO) HIGH Level Output Current (a thru g) LOW Level Output Voltage Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output Current Supply Current Conditions 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) VCC = Max, VI = 2.4V (Except BI/RBO) VCC = Max VI = 0.4V VCC = Max (BI/RBO) VCC = Max (Note 8)
Note 7: All typicals are at VCC = 5V, TA = 25C. Note 8: ICC is measured with all outputs OPEN and all inputs at 4.5V.
Min
Typ (Note 7)
Max -1.5
Units V V
2.4
3.7 250 0.3 0.4 1 40
A V mA A mA mA mA
BI/RBO Others
-4 -1.6 -4 60 103
DM7446A Switching Characteristics
at VCC = 5V and TA = 25C Symbol tPLH tPHL Parameter Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output CL = 15 pF RL = 120 Conditions Min Max 100 100 Units ns ns
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4
DM7446A, DM7447A
DM7447A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH ICEX VOL II IIH IIL IOS ICC Parameter Input Clamp Voltage HIGH Level Output Voltage (BI/RBO) HIGH Level Output Current (a thru g) LOW Level Output Voltage Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output Current Supply Current VCC = Max, VI = 2.4V VCC = Max VI = 0.4V VCC = Max (BI/RBO) VCC = Max (Note 10)
Note 9: All typicals are at VCC = 5V, TA = 25C. Note 10: ICC is measured with all outputs OPEN and all inputs at 4.5V.
Conditions 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
Min
Typ (Note 9)
Max -1.5
Units V V
2.4
3.7 250 0.3 0.4 1 40
A V mA A mA mA mA
BI/RBO Others
-4 -1.6 -4 60 103
DM7447A Switching Characteristics
at VCC = 5V and TA = 25C Symbol tPLH tPHL Parameter Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output CL = 15 pF RL = 120 Conditions Min Max 100 100 Units ns ns
5
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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. www.fairchildsemi.com 6 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

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