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74LVX138 Low Voltage 1-of-8 Decoder/Demultiplexer
June 1993 Revised October 2003
74LVX138 Low Voltage 1-of-8 Decoder/Demultiplexer
General Description
The LVX138 is a high-speed 1-of-8 decoder/demultiplexer. This device is ideally suited for high-speed bipolar memory chip select address decoding. The multiple input enables allow parallel expansion to a 1-of-24 decoder using just three LVX138 devices or a 1-of-32 decoder using four LVX138 devices and one inverter.
Features
s Input voltage level translation from 5V to 3V s Ideal for low power/low noise 3.3V applications s Guaranteed simultaneous switching noise level and dynamic threshold performance
Ordering Code:
Order Number 74LVX138M 74LVX138SJ 74LVX138MTC Package Number M16A M16D MTC16 Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Logic Symbols
Connection Diagram
Pin Descriptions
IEEE/IEC Pin Names A0-A2 E1 - E2 E3 O0-O7 Description Address Inputs Enable Inputs Enable Input Outputs
(c) 2003 Fairchild Semiconductor Corporation
DS011615
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74LVX138
Functional Description
The LVX138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive activeLOW outputs (O0-O7). The LVX138 features three Enable inputs, two active-LOW (E1, E2) and one active-HIGH (E3). All outputs will be HIGH unless E1 and E2 are LOW and E3 is HIGH. The LVX138 can be used as an 8-output demultiplexer by using one of the active LOW Enable inputs as the data input and the other Enable inputs as strobes. The Enable inputs which are not used must be permanently tied to their appropriate active-HIGH or active-LOW state.
Truth Table
Inputs E1 H X X L L L L L L L L
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
Outputs A1 X X X L L H H L L H H A2 X X X L L L L H H H H O0 H H H L H H H H H H H O1 H H H H L H H H H H H O2 H H H H H L H H H H H O3 H H H H H H L H H H H O4 H H H H H H H L H H H O5 H H H H H H H H L H H O6 H H H H H H H H H L H O7 H H H H H H H H H H L
E2 X H X L L L L L L L L
E3 X X L H H H H H H H H
A0 X X X L H L H L H L H
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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74LVX138
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) DC Input Diode Current (IIK) VI = -0.5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO = -0.5V VO = VCC + 0.5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground Current (ICC or IGND) Storage Temperature (TSTG) Power Dissipation
-0.5V to +7.0V -20 mA -0.5V to 7V -20 mA +20 mA -0.5V to VCC + 0.5V 25 mA 75 mA -65C to +150C
180 mW
Recommended Operating Conditions (Note 2)
Supply Voltage (VCC) Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) Input Rise and Fall Time (t/V) 2.0V to 3.6V 0V to 5.5V 0V to VCC
-40C to +85C
0 ns/V to 100 ns/V
Note 1: 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. Note 2: Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol VIH Parameter HIGH Level Input Voltage VIL LOW Level Input Voltage VOH HIGH Level Output Voltage VOL LOW Level Output Voltage IIN ICC Input Leakage Current Quiescent Supply Current VCC 2.0 3.0 3.6 2.0 3.0 3.6 2.0 3.0 3.0 2.0 3.0 3.0 3.6 3.6 1.9 2.9 2.58 0.0 0.0 0.1 0.1 0.36 0.1 4.0 2.0 3.0 TA = +25C Min 1.5 2.0 2.4 0.5 0.8 0.8 1.9 2.9 2.48 0.1 0.1 0.44 1.0 40.0 A A V V Typ Max TA = -40C to +85C Min 1.5 2.0 2.4 0.5 0.8 0.8 VIN = VIL or VIH IOH = -50 A IOH = -50 A IOH = -4 mA VIN = VIL or VIH IOL = 50 A IOL = 50 A IOL = 4 mA VIN = 5.5V or GND VIN = VCC or GND V V Max Units Conditions
Noise Characteristics (Note 3)
Symbol VOLP VOLV VIHD VILD Parameter Quiet Output Maximum Dynamic VOL Quiet Output Minimum Dynamic VOL Minimum HIGH Level Dynamic Input Voltage Maximum LOW Level Dynamic Input Voltage VCC (V) 3.3 3.3 3.3 3.3 TA = 25C Typ 0.3 -0.3 Limit 0.5 -0.5 2.0 0.8 Units V V V V CL (pF) 50 50 50 50
Note 3: Input tr = tf = 3 ns
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74LVX138
AC Electrical Characteristics
Symbol tPLH tPHL Parameter Propagation Delay Time An to On tPLH tPHL Propagation Delay Time E1 or E2 to On tPLH tPHL Propagation Delay Time E3 to On tOSHL tOSLH Output to Output Skew (Note 4) 3.3 0.3 2.7 3.3 3.3 0.3 2.7 3.3 0.3 2.7 VCC (V) 2.7 Min TA = +25C Typ 7.1 9.6 5.5 8.0 8.8 11.3 6.9 9.4 8.7 11.2 6.8 9.3 Max 13.8 17.3 8.8 12.3 16.0 19.5 10.4 13.9 16.3 19.8 10.6 14.1 1.5 1.5 TA = -40C to +85C Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max 16.5 20.0 10.5 14.0 18.5 22.0 11.5 15.0 19.5 23.0 12.5 16.0 1.5 1.5 ns ns ns ns Units CL (pF) 15 50 15 50 15 50 15 50 15 50 15 50 50
Note 4: Parameter guaranteed by design. tOSLH = |tPLHm-tPLHn|, tOSHL = |tPHLm-tPHLn|
Capacitance
Symbol CIN CPD Input Capacitance Power Dissipation Capacitance (Note 5) Parameter TA = +25C Min Typ 4 34 Max 10 TA = -40C to +85C Min Max 10 Units pF pF
Note 5: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: CPD x VCC x IIN + ICC
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74LVX138
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Package Number M16A
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74LVX138
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D
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74LVX138 Low Voltage 1-of-8 Decoder/Demultiplexer
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16
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 reasonably expected to result in a significant injury to the user. 7 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com
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