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© 2001 Fairchild Semiconductor Corporation DS006518 www.fairchildsemi.com
September 1986
Revised July 2001
DM7446A, DM7447A BCD to 7-Segment Decoders/Drivers
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-blank-
ing input/output controls and a lamp test input. Segment
identification and resultant displays are shown on a follow-
ing 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 trail-
ing-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 con-
trol the lamp intensity (by pulsing) or to inhibit the outputs.
Features
■All circuit types feature lamp intensity modulation
capability
■Open-collector outputs drive indicators directly
■Lamp-test provision
■Leading/trailing zero suppression
Ordering Code:
Connection Diagram
Order Number Package Number Package Description
DM7446AN N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
DM7447AN N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
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www.fairchildsemi.com 2
DM7446A, DM7447A
Function Table
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 rip-
ple-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
Decimal or Inputs BI/RBO Outputs Note
Function LT RBI D C B A (Note 1) a b c d e f g
0 HHLLLL H LLLLLLH
1 HXLLLH H HLLHHHH
2 HXLLHL H LLHLLHL
3 HXLLHH H LLLLHHL
4 HXLHLL H HLLHHLL
5 HXLHLH H LHLLHLL
6 HXLHHL H HHLLLLL
7 HXLHHH H L L LHHHH(Note 2)
8 HXHLLL H LLLLLLL
9 HXHLLH H LLLHHLL
10 HXHLHL H HHHLLHL
11 HXHLHH H HHLLHHL
12 HXHHL L H HLHHHL L
13 HXHHLH H LHHLHLL
14 HXHHHL H HHHLLLL
15 HXHHHH H HHHHHHH
BI XXXXXX L HHHHHHH(Note 3)
RBI HLLLLL L HHHHHHH(Note 4)
LT LXXXXX H LLLLLLL(Note 5)
3 www.fairchildsemi.com
DM7446A, DM7447A
Absolute Maximum Ratings(Note 6)
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
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
Symbol Parameter Min Nom Max Units
DM7446A
VCC Supply Voltage 4.75 5 5.25 V
VIH HIGH Level Input Voltage 2 V
VIL LOW Level Input Voltage 0.8 V
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
TAFree Air Operating Temperature 0 70 °C
DM7447A
VCC Supply Voltage 4.75 5 5.25 V
VIH HIGH Level Input Voltage 2 V
VIL LOW Level Input Voltage 0.8 V
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
TAFree Air Operating Temperature 0 70 °C
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DM7446A, DM7447A
DM7446A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
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 Parameter Conditions Min Typ Max Units
(Note 7)
VIInput Clamp Voltage VCC = Min, II = −12 mA −1.5 V
VOH HIGH Level Output VCC = Min 2.4 3.7 V
Voltage (BI/RBO) IOH = Max
ICEX HIGH Level Output VCC = Max, VO = 30V 250 µA
Current (a thru g) VIL = Max, VIH = Min
VOL LOW Level VCC = Min, IOL = Max 0.3 0.4 V
Output Voltage VIH = Min, VIL = Max
IIInput Current @ Max VCC = Max, VI = 5.5V 1mA
Input Voltage (Except BI/RBO)
IIH HIGH Level Input VCC = Max, VI = 2.4V 40 µA
Current (Except BI/RBO)
IIL LOW Level Input VCC = Max BI/RBO −4mA
Current VI = 0.4V Others −1.6
IOS Short Circuit VCC = Max −4mA
Output Current (BI/RBO)
ICC Supply Current VCC = Max 60 103 mA
(Note 8)
Symbol Parameter Conditions Min Max Units
tPLH Propagation Delay Time CL = 15 pF 100 ns
LOW-to-HIGH Level Output RL = 120Ω
tPHL Propagation Delay Time 100 ns
HIGH-to-LOW Level Output
5 www.fairchildsemi.com
DM7446A, DM7447A
DM7447A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
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 Parameter Conditions Min Typ Max Units
(Note 9)
VIInput Clamp Voltage VCC = Min, II = −12 mA −1.5 V
VOH HIGH Level Output VCC = Min 2.4 3.7 V
Voltage (BI/RBO) IOH = Max
ICEX HIGH Level Output VCC = Max, VO = 15V 250 µA
Current (a thru g) VIL = Max, VIH = Min
VOL LOW Level Output VCC = Min, IOL = Max 0.3 0.4 V
Voltage VIH = Min, VIL = Max
IIInput Current @ Max VCC = Max, VI = 5.5V 1 mA
Input Voltage
IIH HIGH Level Input Current VCC = Max, VI = 2.4V 40 µA
IIL LOW Level Input VCC = Max BI/RBO −4mA
Current VI = 0.4V Others −1.6
IOS Short Circuit VCC = Max −4mA
Output Current (BI/RBO)
ICC Supply Current VCC = Max 60 103 mA
(Note 10)
Symbol Parameter Conditions Min Max Units
tPLH Propagation Delay Time CL = 15 pF 100 ns
LOW-to-HIGH Level Output RL = 120Ω
tPHL Propagation Delay Time 100 ns
HIGH-to-LOW Level Output
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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 rea-
sonably 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 rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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