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SL74LS138
3-to-8-Line Decoder/Demultiplexer
This schottky-clamped TTL MSI circuit is designed to be used in high-performance memory-decording or data-routing applications requiring very short propagation delay time. In high-performance memory systems this decode can be used to minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit the delay times of this decorder and the enable time of the memory are usually less than the typical access times of the memory. This means that the effective system delay introduced by the schottky-clampled system decoder is negligible. * Designed Specifically for High Speed Memory Decoders and Data Transmission Systems * Incorporate 3 Enabler Inputs to Simplify Cascading AND/OR Data Reception * Schottky Clamped for High Performance
ORDERING INFORMATION SL74LS138N Plastic SL74LS138D SOIC TA = 0 to 70 C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs CS1 CS2 CS3 XXH XHX LXX H H H H H H H H L L L L L L L L L L L L L L L L A2 A1 A0 XXX XXX XXX LLL LLH LHL LHH HLL HLH HHL HHH Outputs Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 H H H HHHHH H H H HHHHH H H H HHHHH L H H H H H H H H L H H H H H H H H L H H H H H H H H L H H H H H H H H H H H H H H H H H H H H
PIN 16 =VCC PIN 8 = GND
LHHH HLHH HHLH HHHL
H = high level (steady state) L = low level (steady state) X = don't care
SLS
System Logic Semiconductor
SL74LS138
MAXIMUM RATINGS *
Symbol VCC VIN VOUT Tstg
*
Parameter Supply Voltage Input Voltage Output Voltage Storage Temperature Range
Value 7.0 7.0 5.5 -65 to +150
Unit V V V C
Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol VCC VIH VIL IOH IOL TA Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Ambient Temperature Range 0 Parameter Min 4.75 2.0 0.8 -0.4 8.0 +70 Max 5.25 Unit V V V mA mA C
DC ELECTRICAL CHARACTERISTICS over full operating conditions
Guaranteed Limit Symbol VIK VOH VOL Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Test Conditions VCC = min, IIN = -18 mA VCC = min, IOH = -0.4 mA VCC = min, IOL = 4 mA VCC = min, IOL = 8 mA IIH High Level Input Current VCC = max, VIN = 2.7 V VCC = max, VIN = 7.0 V IIL IO ICC Low Level Input Current Output Short Circuit Current Supply Current VCC = max, VIN = 0.4 V VCC = max, VO = 0 V (Note 1) VCC = max Outputs enabled and open -20 2.7 0.4 0.5 20 0.1 -0.4 -100 10 A mA mA mA mA Min Max -1.5 Unit V V V
Note 1: Not more than one output should be shorted at a time, and duration should not exceed one second.
SLS
System Logic Semiconductor
SL74LS138
AC ELECTRICAL CHARACTERISTICS (TA=25C, VCC = 5.0 V, CL = 15 pF, RL = 2 k, t r =15
ns, tf = 6.0 ns) Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Parameter Maximum Propagation Delay, Input A to Output Y Maximum Propagation Delay, Input A to Output Y Maximum Propagation Delay, Input A to Output Y Maximum Propagation Delay, Input A to Output Y Maximum Propagation Delay , CS1 to Output Y Maximum Propagation Delay , CS1 to Output Y Maximum Output Transition Time , CS2 or CS3 to Output Y Maximum Output Transition Time , CS2 or CS3 to Output Y 2 32 ns 3 38 18 ns ns 3 39 26 ns ns Level 2 41 27 ns ns Min Max 20 Unit ns
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
NOTES A. CL includes probe and jig capacitance. B. All diodes are 1N916 or 1N3064. Figure 3. Switching Waveforms Figure 4. Test Circuit
SLS
System Logic Semiconductor

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