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CD4028BC BCD-to-Decimal Decoder
October 1987 Revised January 1999
CD4028BC BCD-to-Decimal Decoder
General Description
The CD4028BC is a BCD-to-decimal or binary-to-octal decoder consisting of 4 inputs, decoding logic gates, and 10 output buffers. A BCD code applied to the 4 inputs, A, B, C, and D, results in a high level at the selected 1-of-10 decimal decoded outputs. Similarly, a 3-bit binary code applied to inputs A, B, and C is decoded in octal at outputs 0-7. A high level signal at the D input inhibits octal decoding and causes outputs 0-7 to go LOW. All inputs are protected against static discharge damage by diode clamps to VDD and VSS.
Features
s Wide supply voltage range: s High noise immunity: s Low power TTL compatibility: or 1 driving 74LS s Low power s Glitch free outputs s "Positive logic" on inputs and outputs 3.0V to 15V fan out of 2 driving 74L 0.45 VDD (typ.)
Applications
* Code conversion * Address decoding * Indicator-tube decoder
Ordering Code:
Order Number CD4028BCM CD4028BCN Package Number M16A N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Body 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Connection Diagram
Pin Assignments for DIP and SOIC
Top View
(c) 1999 Fairchild Semiconductor Corporation
DS005959.prf
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CD4028BC
Truth Table
D 0 0 0 0 0 0 0 1 = HIGH Level 0 = LOW Level 0 1 1 1 1 1 1 1 1 C 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 B 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 A 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 4 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 5 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 7 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 8 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1 0 9 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1 Extraordinary States BCD States
Logic Diagram
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CD4028BC
Absolute Maximum Ratings(Note 1)
(Note 2) Supply Voltage (VDD) Input Voltage (VIN) Storage Temperature Range (TS) Power Dissipation (PD) Dual-In-Line Small Outline Lead Temperature (TL) (Soldering, 10 seconds) 260C 700 mW 500 mW -0.5 to +18V -0.5 to VDD +0.5V -65C to +150C
Recommended Operating Conditions (Note 2)
Supply Voltage (VDD) Input Voltage (VIN) Operating Temperature Range (TA) 3 to 15V 0 to VDD V -40C to +85C
Note 1: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed, they are not meant to imply that the devices should be operated at these limits. The table of "Recommended Operating Conditions" and "Electrical Characteristics" provides conditions for actual device operation. Note 2: VSS = 0V unless otherwise specified.
DC Electrical Characteristics (Note 2)
Symbol IDD Parameter Quiescent Device Current Conditions VDD = 5V, VIN = VDD or VSS VDD = 10V, VIN = VDD or VSS VDD = 15V, VIN = VDD or VSS VOL LOW Level Output Voltage |IO| < 1 A, VIL = 0V, VIH = VDD VDD = 5V VDD = 10V VDD = 15V VOH HIGH Level Output Voltage |IO| < 1 A, VIL = 0V, VIH = VDD VDD = 5V VDD = 10V VDD = 15V VIL LOW Level Input Voltage |IO| < 1 A VDD = 5V, VO = 0.5V or 4.5V VDD = 10V, VDD = 15V, VIH HIGH Level Input Voltage |IO| < 1 A VDD = 5V, VO = 0.5V or 4.5V VDD = 10V, VDD = 15V, IOL LOW Level Output Current (Note 3) VO = 1V or 9V VO = 1.5V or 13.5V 3.5 7.0 11.0 0.52 1.3 3.6 -0.2 -0.5 -1.4 -0.3 0.3 3.5 7.0 11.0 0.44 1.1 3.0 -0.16 -0.4 -1.2 0.88 2.2 6.0 -0.32 -0.8 -3.5 -0.3 0.3 3.5 7.0 11.0 0.36 0.9 2.4 -0.12 -0.3 -1.0 -1.0 1.0 V V V mA mA mA mA mA mA A A VO = 1V or 9V VO = 1.5V or 13.5V 1.5 3.0 4.0 2.25 4.5 6.75 1.5 3.0 4.0 1.5 3.0 4.0 V V V 4.95 9.95 14.95 4.95 9.95 14.95 5 10 15 4.95 9.95 14.95 V V V 0.05 0.05 0.05 0 0 0 0.05 0.05 0.05 0.05 0.05 0.05 V V V -40C Min Max 20 40 80 Min +25C Typ 0.01 0.01 0.02 Max 20 40 80 +85C Min Max 150 300 600 Units A A A
VIH = VDD, VIL = 0V VDD = 5V, VO = 0.4V VDD = 10V, VDD = 15V, VO = 0.5V VO = 1.5V
IOH
HIGH Level Output Current (Note 3)
VIH = VDD, VIL = 0V VDD = 5V, VO = 4.6V VDD = 10V, VDD = 15V, VO = 9.5V VO = 13.5V VIN = 0V VIN = 15V
IIN
Input Current
VDD = 15V, VDD = 15V,
Note 3: IOL and IOH are tested one output at a time.
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CD4028BC
AC Electrical Characteristics
Symbol tPHL or tPLH Parameter Propagation Delay Time
(Note 4)
Conditions Min Typ 240 100 70 175 75 60 5 Max 480 200 140 350 150 110 7.5 Units ns ns ns ns ns ns pF
TA = 25C, CL = 50 pF, RL = 200k, Input tr = tf = 20 ns, unless otherwise specified VCC = 5V VCC = 10V VCC = 15V tTHL or tTLH Transition Time VCC = 5V VCC = 10V VCC = 15V CIN Input Capacitance Any Input
Note 4: AC Parameters are guaranteed by DC correlated testing.
Switching Time Waveforms
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CD4028BC
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Body Package Number M16A
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CD4028BC BCD-to-Decimal Decoder
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N16E
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 1. Life support devices or systems are devices or systems device or system whose failure to perform can be reawhich, (a) are intended for surgical implant into the sonably expected to cause the failure of the life support body, or (b) support or sustain life, and (c) whose failure device or system, or to affect its safety or effectiveness. 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 www.fairchildsemi.com user.
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.

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