The LSTTL/MSI SN74LS18 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-4 decoder using just three LS18 devices or to a 1-of- decoder using four LS18s and one inverter. The LS18 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all ON Semiconductor TTL families. Demultiplexing Capability Multiple Input nable for asy xpansion Typical Power Dissipation of mw Active Low Mutually xclusive Outputs Input Clamp Diodes Limit High Speed Termination ffects GUARANTD OPRATING RANGS Symbol Parameter Min Typ Max Unit VCC Supply Voltage 4.75 5.0 5.5 V TA Operating Ambient Temperature Range 0 5 70 C IOH Output Current High 0.4 ma IOL Output Current Low 8.0 ma 16 LOW POWR SCHOTTKY 1 PLASTIC N SUFFIX CAS 648 16 1 SOIC D SUFFIX CAS 751B 16 1 SOIAJ M SUFFIX CAS 966 ORDRING INFORMATION Device Package Shipping SN74LS18N 16 Pin DIP 000 Units/Box SN74LS18D SOIC 16 8 Units/Rail SN74LS18DR SOIC 16 500/Tape & Reel SN74LS18M SOIAJ 16 See Note 1 SN74LS18ML SOIAJ 16 See Note 1 1. For ordering information on the IAJ version of the SOIC package, please contact your local ON Semiconductor representative. Semiconductor Components Industries, LLC, 001 October, 001 Rev. 7 1 Publication Order Number: SN74LS18/D
CONNCTION DIAGRAM DIP (TOP VIW) LOADING (Note a) PIN NAMS HIGH LOW LOGIC SYMBOL 1 456 A0 A1 A 15 14 1 1 11 10 9 7 VCC = PIN 16 GND = PIN 8 LOGIC DIAGRAM A A1 A0 1 VCC = PIN 16 GND = PIN 8 = Pin Numbers O7 O6 O5 O4 O O O1 O0
FUNCTIONAL DSCRIPTION The LS18 is a high speed 1-of-8 Decoder/Demultiplexer fabricated with the low power Schottky barrier diode process. The decoder accepts three binary weighted inputs (A0, A1, A) and when enabled provides eight mutually exclusive active LOW Outputs (O0 O7). The LS18 features three nable inputs, two active LOW (1, ) and one active HIGH (). All outputs will be HIGH unless 1 and are LOW and is HIGH. This multiple enable function allows easy parallel expansion of the device to a 1-of- (5 lines to lines) decoder with just four LS18s and one inverter. (See Figure a.) The LS18 can be used as an 8-output demultiplexer by using one of the active LOW nable inputs as the data input and the other nable inputs as strobes. The nable inputs which are not used must be permanently tied to their appropriate active HIGH or active LOW state. INPUTS TRUTH TABL OUTPUTS 1 A0 A1 A O0 O1 O O O4 O5 O6 O7 H X X X X X H H H H H H H H X H X X X X H H H H H H H H X X L X X X H H H H H H H H L L H L L L L H H H H H H H L L H H L L H L H H H H H H L L H L H L H H L H H H H H L L H H H L H H H L H H H H L L H L L H H H H H L H H H L L H H L H H H H H H L H H L L H L H H H H H H H H L H L L H H H H H H H H H H H L H = HIGH Voltage Level L = LOW Voltage Level X = Don t Care A0 A1 A A LS04 A4 LS18 LS18 LS18 LS18 O0 Figure a O1
DC CHARACTRISTICS OVR OPRATING TMPRATUR RANG (unless otherwise specified) Limits Symbol Parameter Min Typ Max Unit Test Conditions VIH Input HIGH Voltage.0 V Guaranteed Input HIGH Voltage for All Inputs VIL Input LOW Voltage 0.8 V Guaranteed Input LOW Voltage for All Inputs VIK Input Clamp Diode Voltage 0.65 1.5 V VCC = MIN, IIN = 18 ma VOH Output HIGH Voltage.7.5 V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table VOL Output LOW Voltage 0.5 0.4 V IOL = 4.0 ma VCC = VCC MIN, VIN = VIL or VIH 0.5 0.5 V IOL = 8.0 ma per Truth Table IIH Input HIGH Current 0 µa VCC = MAX, VIN =.7 V 0.1 ma VCC = MAX, VIN = 7.0 V IIL Input LOW Current 0.4 ma VCC = MAX, VIN = 0.4 V IOS Short Circuit Current (Note ) 0 100 ma VCC = MAX ICC Power Supply Current 10 ma VCC = MAX. Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTRISTICS (TA = 5 C) Symbol Propagation Delay Address to Output Propagation Delay Address to Output Parameter Propagation Delay 1 or nable to Output Propagation Delay nable to Output Levels of Limits Delay Min Typ Max Unit Test Conditions 1 7 18 6 1 1 17 5 0 41 7 9 18 6 8 ns ns ns ns VCC = 5.0 V CL = 15 pf AC WAVFORMS VIN VIN VOUT VOUT Figure 1. Figure. 4
PACKAG DIMNSIONS N SUFFIX PLASTIC PACKAG CAS 648 08 ISSU R H A G B F C S K D 16 PL T J L M 5
PACKAG DIMNSIONS D SUFFIX PLASTIC SOIC PACKAG CAS 751B 05 ISSU J T G A D 16 PL K B P 8 PL R X 45 C M J F 6
PACKAG DIMNSIONS M SUFFIX SOIAJ PACKAG CAS 966 01 ISSU O e Z D b L H M VIW P A A1 L DTAIL P Q1 c 7
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