Motorola SN54LS623J, SN74LS623DW, SN74LS623N Datasheet

GAB

A1

A2

B2

B1

TO OTHER SIX
TRANSCEIVERS

G

BA

BLOCK DIAGRAM

1/4 LS623

5-1

FAST AND LS TTL DATA

OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUT

The SN54/74LS623 series is an octal bus transceiver designed for
asynchronous two-way communication between data buses. Control function
implementation allows maximum timing flexibility . Enable inputs may be used
to disable the device so that buses are effectively isolated. Depending on the
Logic Levels at the enable inputs, Data transmission is allowed from the A bus
to the B bus or from the B bus to the A bus. The dual-enable configuration
gives the LS623 the capability to store data by simultaneous enabling of G

BA
and GAB. Each output reinforces its input in this transceiver configuration.
Thus, when both control inputs are enabled all other data sources to the two
sets of bus lines (16 in all) will remain at their last states.

18 17 16 15 14 13

1 2 3 4 5 6

7

20 19

8

V

CC

ENABLE

GAB

ENABLE

G

BA

B1 B2 B3 B5B4 B6

A1 A2 A3 A4 A5 A6 A7

9 10

A8 GND

12 11

B7 B8

FUNCTION TABLE

ENABLE INPUTS OPERATION

GBA GAB LS623

L L B data to A bus
H H A data to B bus
H L Isolation

L H

B data to A bus,

A data to B bus

H = HIGH Level, L = LOW Level, X = Irrelevant

SN54/74LS623

OCTAL BUS TRANSCEIVER

WITH 3-STATE OUTPUT

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC

20

1

J SUFFIX

CERAMIC

CASE 732-03

20

1

N SUFFIX

PLASTIC

CASE 738-03

20

1

DW SUFFIX

SOIC

CASE 751D-03

CONNECTION DIAGRAM (TOP VIEW)

5-2

FAST AND LS TTL DATA

SN54/74LS623

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

Supply Voltage 54

74

4.5

4.75

5.0

5.0

5.5

5.25

V

T

A

Operating Ambient Temperature Range 54

74

–55

0

25
25

125

70

°C

54, 74 –3.0 mA

OH

54
74

–12
–15

mA

I

OL

Output Current — Low 54

74

12
24

mA

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol

Parameter

Min Typ Max

Unit

Test Conditions

V

IH

Input HIGH Voltage 2.0 V

Guaranteed Input HIGH Voltage for
All Inputs

54 0.5

VILInput LOW Voltage

74 0.6

V

Guaranteed Input LOW Voltage for
All Inputs

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

IK

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

VOHOutput HIGH Voltage

54, 74 2.0 V

VCC = MIN, IOH = MAX

54, 74 0.25 0.4 V IOL = 12 mA

VOLOutput LOW Voltage

74 0.35 0.5 V IOL = 24 mA

VIN = VIL or V

IH

per Truth Table

I

OZH

Output Off Current HIGH 20 µA VCC = MAX, V

OUT

= 2.7 V

I

OZL

Output Off Current LOW –400 µA VCC = MAX, V

OUT

= 4.0 V

A, or B, GBA or
GAB

20 µA VCC = MAX, VIN = 2.7 V

IIHInput HIGH Current

GAB or GAB

0.1 mA VCC = MAX, VIN = 7.0 V

A or B

0.1 mA VCC = MAX, VIN = 5.5 V

I

IL

Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V

I

OS

Short Circuit Current (Note 1) –40 –225 mA VCC = MAX
Power Supply Current

Total Output HIGH

70

I

CC

Total Output LOW

90

mA

VCC = MAX

Total at HIGH Z

95

Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.

I

OH

Output Current — High

Guaranteed Input LOW Voltage for

VCC = VCC MIN,