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SN54/74LS245 OCTAL BUS TRANSCEIVER
The SN54 / 74LS245 is an Octal Bus Transmitter/Receiver designed for 8-line asynchronous 2-way data communication between data buses. Direction Input (DR) controlstransmission of Data from bus A to bus B or bus B to bus A depending upon its logic level. The Enable input (E) can be used to isolate the buses.

OCTAL BUS TRANSCEIVER
LOW POWER SCHOTTKY

• • ••

Hysteresis Inputs to Improve Noise Immunity 2-Way Asynchronous Data Bus Communication Input Diodes Limit High-Speed Termination Effects ESD > 3500 Volts LOGIC AND CONNECTION DIAGRAMS DIP (TOPVIEW)
VCC 20 E 19 B1 18 B2 17 B3 16 B4 15 B5 14 B6 13 B7 12 B8 11
20 1

J SUFFIX CERAMIC CASE 732-03

1 DIR

2 A1

3 A2

4 A3

5 A4

6 A5

7 A6

8 A7

9 A8

10 GND

20 1

NSUFFIX PLASTIC CASE 738-03

TRUTH TABLE
INPUTS OUTPUT E L L H DIR L H X Bus B Data to Bus A Bus A Data to Bus B Isolation

20 1

DW SUFFIX SOIC CASE 751D-03

ORDERING INFORMATION
SN54LSXXXJCeramic SN74LSXXXN Plastic SN74LSXXXDW SOIC

H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial

GUARANTEED OPERATING RANGES
Symbol VCC TA IOH Supply Voltage Operating Ambient TemperatureRange Output Current — High Parameter 54 74 54 74 54, 74 54 74 IOL Output Current — Low 54 74 Min 4.5 4.75 – 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 – 3.0 – 12 – 15 12 24 Unit V °C mA mA mAFAST AND LS TTL DATA 5-1

SN54/74LS245
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol S b l VIH VIL VT+–VT– VIK VOH Parameter P Input HIGH Voltage 54Input LOW Voltage 74 Hysteresis Input Clamp Diode Voltage 54, 74 Output HIGH Voltage 54, 74 54, 74 VOL IOZH IOZL Output LOW Voltage 74 Output Off Current HIGH Output Off Current LOW A or B, DR or EIIH Input HIGH C I Current DR or E A or B IIL IOS Input LOW Current Output Short Circuit Current (Note 1) Power Supply Current Total, Output HIGH ICC Total, Output LOW Total at HIGH Z – 40 0.35 0.5 20...
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