54act245 National Semiconductor Corporation, 54act245 Datasheet

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54act245

Manufacturer Part Number
54act245
Description
Octal Bidirectional Transceiver With Tri-state Inputs/outputs
Manufacturer
National Semiconductor Corporation
Datasheet

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© 1998 National Semiconductor Corporation
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 the A and B ports. The Transmit/Receive (T/R)
input determines the direction of data flow through the bidi-
rectional 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 A and B ports by placing them in a HIGH
Z condition.
Logic Symbols
TRI-STATE
FACT
®
is a registered trademark of Fairchild Semiconductor Corporation.
®
is a registered trademark of National Semiconductor Corporation.
OE
T/R
A
B
0
0
Names
–A
–B
Pin
7
7
DS100283
DS100283-1
Output Enable Input
Transmit/Receive Input
Side A TRI-STATE Inputs or TRI-STATE Outputs
Side B TRI-STATE Inputs or TRI-STATE Outputs
Description
Features
n I
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
CC
and I
OZ
reduced by 50%
IEEE/IEC
®
DS100283-2
www.national.com
August 1998

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54act245 Summary of contents

Page 1

... 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 both the A and B ports. The Transmit/Receive (T/R) input determines the direction of data flow through the bidi- rectional transceiver. Transmit (active-HIGH) enables data from A ports to B ports ...

Page 2

Connection Diagrams Pin Assignment for DIP and Flatpak DS100283-3 www.national.com Pin Assignment for LCC DS100283-4 Truth Table Inputs OE T Bus B Data to Bus Bus A Data to Bus HIGH-Z State ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( Input Diode Current ( −0. ...

Page 4

DC Characteristics for ’AC Family Devices Symbol Parameter I (Note 3) Minimum OLD Dynamic Output I OHD Current I Maximum Quiescent CC Supply Current I Maximum I/O OZT Leakage Current Note 2: All outputs loaded; thresholds on input associated with ...

Page 5

DC Characteristics for ’ACT Family Devices Symbol Parameter I Maximum I/O OZT Leakage Current Note 5: All outputs loaded; thresholds on input associated with output under test. Note 6: Maximum test duration 2.0 ms, one output loaded at a time. ...

Page 6

Capacitance Symbol Parameter C Input Capacitance IN C Input/Output I/O Capacitance C Power Dissipation PD Capacitance www.national.com Typ Units Conditions = OPEN 4 5.0V 15 5.0V 45 ...

Page 7

Physical Dimensions inches (millimeters) unless otherwise noted 20 Terminal Ceramic Leadless Chip Carrier (L) 20-Lead Ceramic Dual-In-Line Package (D) NS Package Number E20A NS Package Number J20A 7 www.national.com ...

Page 8

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR ...

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