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MM74C48 BCD-to-7 Segment Decoder
October 1987 Revised January 1999
MM74C48 BCD-to-7 Segment Decoder
General Description
The MM74C48 BCD-to-7 segment decoder is a monolithic complementary MOS (CMOS) integrated circuit constructed with N- and P-channel enhancement transistors. Seven NAND gates and one driver are connected in pairs to make binary-coded decimal (BCD) data and its complement available to the seven decoding AND-OR-INVERT gates. The remaining NAND gate and three input buffers provide test-blanking input/ripple-blanking output, and ripple-blanking inputs.
Features
s Wide supply voltage range: s Guaranteed noise margin: s High noise immunity: fan out of 2 driving 74L s High current sourcing output (up to 50 mA) s Ripple blanking for leading or trailing zeros (optional) s Lamp test provision 3.0V to 15V 1.0V 0.45 VCC (typ.)
s Low power TTL compatibility:
Ordering Code:
Order Number MM74C48N Package Number N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Connection Diagrams
Pin Assignments for DIP Segment Identification
Numerical Designations and Resultant Displays
Top View
(c) 1999 Fairchild Semiconductor Corporation
DS005883.prf
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MM74C48
Truth 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 L = LOW Level X = Irrelevant Note 1: One BI/RBO is wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO). Note 2: The blanking input (BI) must be open when output functions 0-15 are desired. The ripple-blanking input (RBI) must be 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 LOW 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 LOW 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 and a LOW is applied to the lamp-test input, all segment outputs are HIGH.
Inputs BI/RBO 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 (Note 1) H H H H H H H H H H H H H H H H L L H a H L H H L H L H H H L L L H L L L L H b H H H H H L L H H H L L H L L L L L H c H H L H H H H H H H L H L L L L L L H
Outputs Note d H L H H L H H L H L H H L H H L L L H e H L H L L L H L H L H L L L H L L L H f H L L L H H H L H H L L H H H L L L H g L L H H H H H L H H H H H H H L L L H (Note 3) (Note 4) (Note 5) (Note 2) (Note 2)
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MM74C48
Absolute Maximum Ratings(Note 6)
Voltage at Any Pin Operating Temperature Range Storage Temperature Range Power Dissipation Dual-In-Line Small Outline Operating VCC Range 700 mW 500 mW 3.0V to 15V -0.3V to VCC + 0.3V -40C to +85C -65C to +150C
Absolute Maximum VCC Lead Temperature (Soldering, 10 seconds)
18V 260C
Note 6: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. Except for "Operating Temperature Range" they are not meant to imply that the devices should be operated at these limits. The Electrical Characteristics table provides conditions for actual device operation.
DC Electrical Characteristics
Symbol CMOS to CMOS VIN(1) VIN(0) VOUT(1) VOUT(0) IIN(1) IIN(0) ICC VIN(1) VIN(0) VOUT(1) VOUT(0) ISOURCE ISINK ISINK ISOURCE Logical "1" Input Voltage Logical "0" Input Voltage Logical "1" Output Voltage (RB Output Only) Logical "0" Output Voltage Logical "1" Input Current Logical "0" Input Current Supply Current Logical "1" Input Voltage Logical "0" Input Voltage Logical "1" Output Voltage (RB Output Only) Logical "0" Output Voltage Output Source Current (P-Channel) (RB Output Only) Output Sink Current (N-Channel) Output Sink Current (N-Channel) Output Source Current (NPN Bipolar) VCC = 4.75V, IO = 360 A VCC = 4.75V, VOUT = 0.4V VCC = 10V, VOUT = 0.5V VCC = 5.0V, VOUT = VCC TA = 25C VCC = 10V, VOUT = VCC TA = 25C VCC = 5.0V, VOUT = 3.4V VCC = 5.0V, VOUT = 3.0V VCC = 10V, VOUT = 8.4V VCC = 10V, VOUT = 8.0V -20 -20 -50 -65 -50 -65 mA mA mA mA 8.0 16 mA 1.75 3.6 0.4 -0.80 -4.0 V mA mA mA OUTPUT DRIVE (See Family Characteristics Data Sheet) VCC = 5.0V VCC = 10V VCC = 5.0V VCC = 10V VCC = 5.0V, IO = -10 A VCC = 10V, IO = -10 A VCC = 5.0V, IO = 10 A VCC = 10V, IO = 10 A VCC = 15.0V, VIN = 15V VCC = 15.0V, VIN = 0V VCC = 15V VCC = 4.75V VCC = 4.75V VCC = 4.75V, IO = -50 A 2.4 VCC - 1.5 0.8 -1.0 0.005 -0.005 0.05 300 4.5 9.0 0.5 1.0 1.0 3.5 8.0 1.5 2.0 V V V V V V V V A A A V V V Parameter Conditions Min Typ Max Units
CMOS/LPTTL INTERFACE
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MM74C48
AC Electrical Characteristics
TA = 25C, CL = 50 pF, unless otherwise specified
Symbol tpd0, tpd1 tpd0 tpd0 tpd1 tpd1 tpd0 Parameter Propagation Delay to a "1" or "0" on Segment Outputs from Data Inputs Propagation Delay to a "0" on Segment Outputs from RB Input Propagation Delay to a "0" on Segment Outputs from Blanking Input Propagation Delay to a "1" on Segment Outputs from Lamp Test Propagation Delay to a "1" on RB Output from RB Input Propagation Delay to a "0" on RB Output from RB Input
(Note 7)
Conditions VCC = 5.0V VCC = 10V VCC = 5.0V VCC = 10V VCC = 5.0V VCC = 10V VCC = 5.0V VCC = 10V VCC = 5.0V VCC = 10V VCC = 5.0V VCC = 10V Min Typ 450 160 500 180 350 140 450 160 600 250 140 50 Max 1500 500 1600 550 1200 450 1500 500 2000 800 450 150 Units ns ns ns ns ns ns ns ns ns ns ns ns
Note 7: AC Parameters are guaranteed by DC correlated testing.
Typical Applications
Typical Connection Utilizing the Ripple-Blanking Feature
First three stages will blank leading zeros, the fourth stage will not blank zeros.
Blanking Input Connection Diagram
When RBO/BI is forced LOW, all segment outputs are off regardless of the state of any other input condition.
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MM74C48
Light Emitting Diode (LED) Readout
Incandescent Readout
Fluorescent Readout
**A filament pre-warm resistor is recommended to reduce filament thermal shock and increase the effective cold resistance of the filament.
Gas Discharge Readout
Liquid Crystal (LC) Readout
Direct DC drive of LC's not recommended for life of LC readouts.
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MM74C48 BCD-to-7 Segment Decoder
Physical Dimensions inches (millimeters) unless otherwise noted
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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