NSC 5962R8766301SSA, 5962R8766301SRA, 5962R8766301S2A, 5962R8766301BSA, 5962R8766301BRA Datasheet
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54AC245•54ACT245
Octal Bidirectional Transceiver with TRI-STATE
®
Inputs/Outputs
General Description
The ’AC/’ACT245 contains eight non-inverting bidirectional
buffers with TRI-STATE outputs and is intended for
bus-oriented applications. Current sinking capability is
24 mA at both theAand B ports. The Transmit/Receive (T/R)
input determines the direction of data flow through the bidirectional transceiver. Transmit (active-HIGH) enables data
from A ports to B ports; Receive (active-LOW) enables data
from B ports to A ports. The Output Enable input, when
HIGH, disables both Aand B ports by placing them in a HIGH
Z condition.
Features
n ICCand IOZreduced by 50
%
n Noninverting buffers
n Bidirectional data path
n A and B outputs source/sink 24 mA
n ’ACT245 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’AC245: 5962-87758
— ’ACT245: 5962-87663
Logic Symbols
Pin Description
Names
OE
Output Enable Input
T/R
Transmit/Receive Input
A
0–A7
Side A TRI-STATE Inputs or TRI-STATE Outputs
B
0–B7
Side B TRI-STATE Inputs or TRI-STATE Outputs
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
FACT
®
is a registered trademark of Fairchild Semiconductor Corporation.
DS100283-1
IEEE/IEC
DS100283-2
August 1998
54AC245
•
54ACT245 Octal Bidirectional Transceiver with TRI-STATE Inputs/Outputs
© 1998 National Semiconductor Corporation DS100283 www.national.com
Connection Diagrams
Truth Table
Inputs Outputs
OE
T/R
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X HIGH-Z State
H=HIGH Voltage Level
L=LOW Voltage Level
X=Immaterial
Pin Assignment for
DIP and Flatpak
DS100283-3
Pin Assignment for LCC
DS100283-4
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
) −0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
=
−0.5V −20 mA
V
I
=
V
CC
+ 0.5V +20 mA
DC Input Voltage (V
I
) −0.5V to VCC+ 0.5V
DC Output Diode Current (I
OK
)
V
O
=
−0.5V −20 mA
V
O
=
V
CC
+ 0.5V +20 mA
DC Output Voltage (V
O
) −0.5V to VCC+ 0.5V
DC Output Source
or Sink Current (I
O
)
±
50 mA
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
±
50 mA
Storage Temperature (T
STG
) −65˚C to +150˚C
Junction Temperature (T
J
)
CDIP 175˚C
Recommended Operating
Conditions
Supply Voltage (VCC)
’AC 2.0V to 6.0V
’ACT 4.5V to 5.5V
Input Voltage (V
I
) 0VtoV
CC
Output Voltage (VO) 0VtoV
CC
Operating Temperature (TA)
54AC/ACT −55˚C to +125˚C
Minimum Input Edge Rate (∆V/∆t)
’AC Devices
V
IN
from 30%to 70%of V
CC
V
CC
@
3.3V, 4.5V, 5.5V 125 mV/ns
Minimum Input Edge Rate (∆V/∆t)
’ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@
4.5V, 5.5V 125 mV/ns
Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. National does not recommend operation of FACT
®
circuits outside databook specifications.
DC Characteristics for ’AC Family Devices
54AC
Symbol Parameter V
CC
T
A
=
Units Conditions
(V) −55˚C to +125˚C
Guaranteed
Limits
V
IH
Minimum High 3.0 2.1 V
OUT
=
0.1V
Level Input 4.5 3.15 V or V
CC
− 0.1V
Voltage 5.5 3.85
V
IL
Maximum Low 3.0 0.9 V
OUT
=
0.1V
Level Input 4.5 1.35 V or V
CC
− 0.1V
Voltage 5.5 1.65
V
OH
Minimum High 3.0 2.9 I
OUT
=
−50 µA
Level Output 4.5 4.4 V
Voltage 5.5 5.4
(Note 2)
V
IN
=
V
IL
or V
IH
3.0 2.4 −12 mA
4.5 3.7 V I
OH
−24 mA
5.5 4.7 −24 mA
V
OL
Maximum Low 3.0 0.1 I
OUT
=
50 µA
Level Output 4.5 0.1 V
Voltage 5.5 0.1
(Note 2)
V
IN
=
V
IL
or V
IH
3.0 0.50 12 mA
4.5 0.50 V I
OL
24 mA
5.5 0.50 24 mA
I
IN
Maximum Input 5.5
±
1.0 µA V
I
=
V
CC
, GND
Leakage Current
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