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CA3161
August 1997
BCD to Seven Segment Decoder/Driver
Description
The CA3161E is a monolithic integrated circuit that performs the BCD to seven segment decoding function and features constant current segment drivers. When used with the CA3162E A/D Converter the CA3161E provides a complete digital readout system with a minimum number of external parts.
Features
· TTL Compatible Input Logic Levels · 25mA (Typ) Constant Current Segment Outputs · Eliminates Need for Output Current Limiting Resistors · Pin Compatible with Other Industry Standard Decoders · Low Standby Power Dissipation . . . . . . . . 18mW (Typ)
Ordering Information
PART NUMBER CA3161E TEMP. RANGE (oC) 0 to 70 PACKAGE 16 Ld PDIP PKG. NO. E16.3
Pinout
CA3161 (PDIP) TOP VIEW
Functional Block Diagram
BCD INPUTS 23 22 21 20 6 2 1 7 INPUT BUFFERS BCD TO 7 SEGMENT DECODER 13 12 CONSTANT CURRENT SEGMENT DRIVERS 11 10 9 15
BCD INPUTS
21 22 NC NC
1 2 3 4 5 6 7 8
16 V + SEGMENT DRIVER OUTPUTS 15 f 14 g 13 a 12 b 11 c 10 d 9 e BIAS CIRCUITRY
14
a b c d e f g
BCD INPUTS
NC 23 20 GND
8
GND
16 V+ SEGMENT
a-g a f g e d
SEGMENT DRIVER SEGMENT IDENTIFICATION
b c
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
File Number
1079.3
9-5
SEGMENT DRIVER OUTPUTS
CA3161
Absolute Maximum Ratings
DC VSUPPLY (Between Terminals 1 and 10) . . . . . . . . . . . . . . +7.0V Input Voltage (Terminals 1, 2, 6, 7). . . . . . . . . . . . . . . . . . . . . . +5.5V Output Voltage Output "Off". . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V Output "On" (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +10V
Thermal Information
Thermal Resistance (Typical, Note 2) JA (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . .0oC to 75C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES: 1. This is the maximum output voltage for any single output. The output voltage must be consistent with the maximum dissipation and derating curve for worst case conditions. Example: All segments "ON", 100% duty cycle. 2. JA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
PARAMETER VSUPPLY Operating Range, V +
TA = 25oC TEST CONDITIONS MIN 4.5 18 2 2V 0V tPHL tPLH -30 -40 TYP 5 3.5 25 2.6 1.4 MAX 5.5 8 32 250 0.8 UNITS V mA mA µA V V µA µA µs µs
Supply Current, l+ (All Inputs High) Output Current Low (VO = 2V) Output Current High (VO = 5.5V) Input Voltage High (Logic "1" Level) Input Voltage Low (Logic "0" Level) Input Current High (Logic "1") Input Current Low (Logic "0") Propagation Delay Time,
9-6
CA3161
TRUTH TABLE BINARY STATE 0 INPUTS 23 L 22 L 21 L 20 L a L b L c L OUTPUTS d L e L f L g H DISPLAY
1
L
L
L
H
H
L
L
H
H
H
H
2
L
L
H
L
L
L
H
L
L
H
L
3
L
L
H
H
L
L
L
L
H
H
L
4
L
H
L
L
H
L
L
H
H
L
L
5
L
H
L
H
L
H
L
L
H
L
L
6
L
H
H
L
L
H
L
L
L
L
L
7
L
H
H
H
L
L
L
H
H
H
H
8
H
L
L
L
L
L
L
L
L
L
L
9
H
L
L
H
L
L
L
L
H
L
L
10
H
L
H
L
H
H
H
H
H
H
L
11
H
L
H
H
L
H
H
L
L
L
L
12
H
H
L
L
H
L
L
H
L
L
L
13
H
H
L
H
H
H
H
L
L
L
H
14
H
H
H
L
L
L
H
H
L
L
L
15
H
H
H
H
H
H
H
H
H
H
H
BLANK
9-7
CA3161
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Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
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Sales Office Headquarters
NORTH AMERICA Intersil Corporation P. O. Box 883, Mail Stop 53-204 Melbourne, FL 32902 TEL: (407) 724-7000 FAX: (407) 724-7240 EUROPE Intersil SA Mercure Center 100, Rue de la Fusee 1130 Brussels, Belgium TEL: (32) 2.724.2111 FAX: (32) 2.724.22.05 ASIA Intersil (Taiwan) Ltd. Taiwan Limited 7F-6, No. 101 Fu Hsing North Road Taipei, Taiwan Republic of China TEL: (886) 2 2716 9310 FAX: (886) 2 2715 3029
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