LS138

SL74LS138 SLS | Alldatasheet

Document overview

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Technical content

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

TA = 0° to 70° C for all packages PIN ASSIGNMENT FUNCTION TABLE Inputs Outputs CS1 CS2 CS3 A2 A1 A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X H X H X L X X X X X X X X X X X H H H H H H H H H H H H H H H H H H H H H H H H H L L H L L H L L H L L L L L L L H L H L L 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 L H H H H H L L H L L H L L H L L H L L H L H H H L 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 L H = high level (steady state) L = low level (steady state) X = don’t care LOGIC DIAGRAM PIN 16 =VCC PIN 8 = GND

MAXIMUM RATINGS* Symbol Parameter Value Unit VCC Supply Voltage 7.0 V VIN Input Voltage 7.0 V VOUT Output Voltage 5.5 V Tstg Storage Temperature Range -65 to +150 °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 Parameter Min Max Unit VCC Supply Voltage 4.75 5.25 V VIH High Level Input Voltage 2.0 V VIL Low Level Input Voltage 0.8 V IOH High Level Output Current -0.4 mA IOL Low Level Output Current 8.0 mA TA Ambient Temperature Range 0 +70 °C DC ELECTRICAL CHARACTERISTICS over full operating conditions Guaranteed Limit Symbol Parameter Test Conditions Min Max Unit VIK Input Clamp Voltage VCC = min, IIN = -18 mA -1.5 V VOH High Level Output Voltage VCC = min, IOH = -0.4 mA 2.7 V VOL Low Level Output Voltage VCC = min, IOL = 4 mA 0.4 V VCC = min, IOL = 8 mA 0.5 IIH High Level Input Current VCC = max, VIN = 2.7 V 20 µA VCC = max, VIN = 7.0 V 0.1 mA IIL Low Level Input Current VCC = max, VIN = 0.4 V -0.4 mA IO Output Short Circuit Current VCC = max, VO = 0 V (Note 1) -20 -100 mA ICC Supply Current VCC = max Outputs enabled and open 10 mA Note 1: Not more than one output should be shorted at a time, and duration should not exceed one second.