Fa a a Ek ee MOTOROLA SC {LOGIC} D2 DEP b3u7a52 oosoz0L 3 Af , MOTOROLA T-lbb-O1se ms SEMICONDUCTOR soa TECHNICAL DATA MC54/74HC138 1-of-8 Decoder/Demultiplexer High-Performance Silicon-Gate CMOS J SUFFIX ij M i CERAMIC The MC54/74HC138 is identical in pinout to the L$138. The device inputs.are 16 Y CASE 620-69 compatible with standard CMOS outputs; with pullup resistors, they are compatible ' with LSTTL outputs. : N SUFFIX The HC138 decodes a three-bit Address to one-of-eight active-low outputs. This PLASTIC device features three Chip Select inputs, two active-low and one active-high to fa- CASE 648-06 cilitate the demultiplexing, cascading, and chip-selecting functions. The demultiplex- 16 ing function is accomplished by using the Address inputs to select the desired 1 device output; one of the Chip Selects is used as a data input while the other Chip D SUFFIX Selects are held in their active states. Ds vr . soic @ Output Drive Capability: 10 LSTTL Loads i. Phd CASE 7518-03 @ Outputs Directly Interface to CMOS, NMOS, and TTL @ Operating Voltage Range: 2 to6 V @ Low Input Current: 1 pA . ORDERING INFORMATION @ High Noise immunity Characteristic of CMOS Devices - @ In Compliance with the Requirements Defined by JEDEC Standard No. 7A ~ MC74HCXXXN Plastic @ Chip Complexity: 116 FETs or 29 Equivalent Gates MCB4HCXXXS Ceramic MC74HCXXXD soic TA= 65 to 125C for all packages. Dimensions in Chapter 7. LOGIC DIAGRAM ao ! 18 vo - PIN ASSIGNMENT nous. Al 2 4 ov / Ao fie Voc Al YO ag 34 b 13 y 4 2 A2q Yi p Y3 Active-Low cs2 g y2 " Outputs p Y4 cs3 3 b!9. v5 cst g Y4 9 \ Y7 q Y5 7 GND Y6 b 7 6 | FUNCTION TABLE csi Chip- 4 , Select cS2. _______ Inputs Outputs Inputs css 2 CS1 CS2 cs3lA2 A1 Adl Yo Y1 Y2 Y3 Y4 Y5 Y6 Y7 xX X H|X X X/H HHHHHHH Pin 16=Vcc X H X]X X X}H HH HHHHH Pin 8 =GND tL XxX xX{X X X}H HHHHHHH H L LIL L LIL HHHHHHR H L LIL LH/HLHHHHHH H L LIL HLJHHLHHHHH HL Lit HH{HHHLHHHH H L LIHLLHHHHLAHH H L LHL H}HHHHHLHH H tL LH HL]IHHHHHHLH Hot LIHRHIH HHH HHH L H=high level (steady state} L= low level (steady state) X= dont care MOTOROLA HIGH-SPEED CMOS LOGIC DATA 5-142eas MOTOROLA SC {LOGIC} O82 a | bab?2Se OO80207 s He 80207 OD _ MC54/74HC138 V-lblo-a\ -55 MAXIMUM RATINGS* Symbol Parameter Value Unit This device contains protection Vec | DC Supply Voltage (Referenced to GND) -0.5 to +7.0 V circuitry to guard against damage due to high static voltages or electric Vin DC Input Voltage (Referenced to GND) 1.6 to Vec+1.5 v fields. However, precautions must Vout | DC Output Voltage (Referenced to GND) 0.5 to Vcc +0.5 v be taken to avoid applications of any lin DC Input Current, per Pin +20 mA voltage higher than maximum rated - voltages to this high-impedance fout__] PC Output Current, per Pin - 25 mA circuit. For proper operation, Vin and Icc__ | DC Supply Current, Voc and GND Pins +50 mA Vout should be constrained to the Pp Power Dissipation in Still Air, Plastic or Ceramic DIPt 750 mw range GND <(Vin or Vout) s Vcc. SOIC Packaget 500 Unused inputs must always be tied _ to an appropriate logic voltage level |_Tstg | Storage Temperature 85 to +160 << {e.g., either GND or Voc). Unused TL Lead Temperature, 1.mm from Case for 10 Seconds Cc outputs must be left open. - {Plastic DIP or SOIC Package) 260 (Ceramic DIP) 300 *Maximum Ratings are those values beyond which damage to the device may occur, Functional operation should be restricted to the Recommended Operating Conditions. tDerating Plastic DIP: 10 mW/C from 65 to 126C Ceramic DIP: 10 mW/C from 100 to 125C SOIC Package: 7 mW/C from 65 to 125C For high frequency or heavy load considerations, sea Chapter 4. RECOMMENDED OPERATING CONDITIONS. Symbol! Parameter Min Max Unit Vcc _| DC Supply Voltage (Referanced to GND) 2.0 6.0 v Vin-Vout | DC Input Voltage, Output Voltage (Referenced to GND) 0 Vcc Vv Ta Operating Temperature, All Package Types 55 +125 c tr, tg | Input Rise and Fall Time Vec=2.0V 0 1000 ns (Figure 2) Vec=45V| 0 500 Vec=6.0V} 0 400 DC ELECTRICAL CHARACTERISTICS (Voltages Referenced to GND) Vv Guaranteed Limit Symbol Parameter Test Conditions cc Unit Y Vi | C to | asec |