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DM7447AN

Part # DM7447AN
Description IC DECODER/DRVR BCD-7SEG 16-DIP
Category IC
Availability In Stock
Qty 3
Qty Price
1 + $2.01101
Manufacturer Available Qty
National Semiconductor Corp
Date Code: 8210
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

© 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
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 LLLHHHH(Note 2)
8 HXHLLL H LLLLLLL
9 HXHLLH H LLLHHLL
10 HXHLHL H HHHLLHL
11 HXHLHH H HHLLHHL
12 HXHHL L H HLHHHLL
13 HXHHLH H LHHLHLL
14 HXHHHL H HHHLLLL
15 HXHHHH H HHHHHHH
BI XXXXXX L HHHHHHH(Note 3)
RBI HLL L L L 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
V
CC
Supply Voltage 4.75 5 5.25 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
V
OH
HIGH Level Output Voltage (a thru g) 30 V
I
OH
HIGH Level Output Current (BI/RBO) 0.2 µA
I
OL
LOW Level Output Current (a thru g) 40 mA
I
OL
LOW Level Output Current (BI/RBO) 8 mA
T
A
Free Air Operating Temperature 0 70 °C
DM7447A
V
CC
Supply Voltage 4.75 5 5.25 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
V
OH
HIGH Level Output Voltage (a thru g) 15 V
I
OH
HIGH Level Output Current (BI/RBO) 0.2 µA
I
OL
LOW Level Output Current (a thru g) 40 mA
I
OL
LOW Level Output Current (BI/RBO) 8 mA
T
A
Free Air Operating Temperature 0 70 °C
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