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) controls transmission 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
• Hysteresis Inputs to Improve Noise Immunity
LOW POWER SCHOTTKY
• 2-Way Asynchronous Data Bus Communication
• Input Diodes Limit High-Speed Termination Effects
• ESD > 3500 Volts

LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)

J SUFFIX
VCC E B1 B2 B3 B4 B5 B6 B7 B8
CERAMIC
20 19 18 17 16 15 14 13 12 11 CASE 732-03
20
1

N SUFFIX
PLASTIC
CASE 738-03
20
1 2 3 4 5 6 7 8 9 10
1
DIR A1 A2 A3 A4 A5 A6 A7 A8 GND

DW SUFFIX
SOIC
TRUTH TABLE 20
CASE 751D-03
1
INPUTS
OUTPUT
E DIR
L L Bus B Data to Bus A
ORDERING INFORMATION
L H Bus A Data to Bus B
H X Isolation SN54LSXXXJ Ceramic
H = HIGH Voltage Level SN74LSXXXN Plastic
L = LOW Voltage Level SN74LSXXXDW SOIC
X = Immaterial

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 54 4.5 5.0 5.5 V
74 4.75 5.0 5.25
TA Operating Ambient Temperature Range 54 – 55 25 125 °C
74 0 25 70

IOH Output Current — High 54, 74 – 3.0 mA

54 – 12 mA
74 – 15

IOL Output Current — Low 54 12 mA

74 24

FAST AND LS TTL DATA

5-398
 SN54/74LS245

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits
Symbol Parameter Min Typ Max Unit Test Conditions
Guaranteed Input HIGH Voltage for
VIH Input HIGH Voltage 2.0 V
All Inputs
54 0.7 Guaranteed Input LOW Voltage for
VIL Input LOW Voltage V
74 0.8 All Inputs

VT+–VT– Hysteresis 0.2 0.4 V VCC = MIN

VIK Input Clamp Diode Voltage – 0.65 – 1.5 V VCC = MIN, IIN = – 18 mA
54, 74 2.4 3.4 V VCC = MIN, IOH = – 3.0 mA
VOH Output HIGH Voltage
54, 74 2.0 V VCC = MIN, IOH = MAX

54, 74 0.25 0.4 V IOL = 12 mA VCC = VCC MIN,

VOL Output LOW Voltage VIN = VIL or VIH
74 0.35 0.5 V IOL = 24 mA per Truth Table

IOZH Output Off Current HIGH 20 µA VCC = MAX, VOUT = 2.7 V

IOZL Output Off Current LOW – 200 µA VCC = MAX, VOUT = 0.4 V
A or B, DR or E 20 µA VCC = MAX, VIN = 2.7 V
IIH Input HIGH Current DR or E 0.1 mA VCC = MAX, VIN = 7.0 V
A or B 0.1 mA VCC = MAX, VIN = 5.5 V
IIL Input LOW Current – 0.2 mA VCC = MAX, VIN = 0.4 V
IOS Output Short Circuit Current (Note 1) – 40 – 225 mA VCC = MAX
Power Supply Current
Total, Output HIGH 70
ICC mA VCC = MAX
Total, Output LOW 90
Total at HIGH Z 95
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.

AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V, TRISE / TFALL ≤ 6.0 ns)

Limits
Symbol Parameter Min Typ Max Unit Test Conditions
tPLH 8.0 12
Propagation Delay, Data to Output ns
tPHL 8.0 12
CL = 45 pF,
tPZH Output Enable Time to HIGH Level 25 40 ns RL = 667 Ω
tPZL Output Enable Time to LOW Level 27 40 ns
tPLZ Output Disable Time from LOW Level 15 25 ns CL = 5.0 pF,
tPHZ Output Disable Time from HIGH Level 15 25 ns RL = 667 Ω

FAST AND LS TTL DATA

5-399
 Case 751D-03 DW Suffix
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Case 738-03 N Suffix

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FAST AND LS TTL DATA

5-400
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Literature Distribution Centers:

SYMBOL SW1 SW2
USA: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. tPZH Open Closed
EUROPE: Motorola Ltd.; European Literature Centre; 88 Tanners Drive, Blakelands, Milton Keynes, MK14 5BP, England.
JAPAN: Nippon Motorola Ltd.; 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan. tPZL Closed Open
ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong.
tPLZ Closed Closed
tPHZ Closed Closed

◊ FAST AND LS TTL DATA

5-401
This datasheet has been download from:

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