TI 54ACT245

54AC245,54ACT245
54AC245 54ACT245 Octal Bidirectional Transceiver with TRI-STATE
Inputs/Outputs
Literature Number: SNOS099
54AC245 • 54ACT245
Octal Bidirectional Transceiver with TRI-STATE ®
Inputs/Outputs
General Description
Features
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 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 A and B ports by placing them in a HIGH
Z condition.
n
n
n
n
n
n
ICC and IOZ reduced by 50%
Noninverting buffers
Bidirectional data path
A and B outputs source/sink 24 mA
’ACT245 has TTL-compatible inputs
Standard Microcircuit Drawing (SMD)
— ’AC245: 5962-87758
— ’ACT245: 5962-87663
Logic Symbols
IEEE/IEC
DS100283-1
DS100283-2
Pin
Description
Names
OE
Output Enable Input
T/R
Transmit/Receive Input
A0–A7
Side A TRI-STATE Inputs or TRI-STATE Outputs
B0–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.
© 1998 National Semiconductor Corporation
DS100283
www.national.com
54AC245 • 54ACT245 Octal Bidirectional Transceiver with TRI-STATE Inputs/Outputs
August 1998
Connection Diagrams
Pin Assignment for
DIP and Flatpak
Pin Assignment for LCC
DS100283-4
Truth Table
Inputs
OE
DS100283-3
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
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2
Outputs
T/R
Absolute Maximum Ratings (Note 1)
Recommended Operating
Conditions
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VCC)
DC Input Diode Current (IIK)
VI = −0.5V
VI = VCC + 0.5V
DC Input Voltage (VI)
DC Output Diode Current (IOK)
VO = −0.5V
VO = VCC + 0.5V
DC Output Voltage (VO)
DC Output Source
or Sink Current (IO)
DC VCC or Ground Current
per Output Pin (ICC or IGND)
Storage Temperature (TSTG)
Junction Temperature (TJ)
CDIP
Supply Voltage (VCC)
’AC
’ACT
Input Voltage (VI)
Output Voltage (VO)
Operating Temperature (TA)
54AC/ACT
Minimum Input Edge Rate (∆V/∆t)
’AC Devices
VIN from 30% to 70% of VCC
VCC @ 3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (∆V/∆t)
’ACT Devices
VIN from 0.8V to 2.0V
VCC @ 4.5V, 5.5V
−0.5V to +7.0V
−20 mA
+20 mA
−0.5V to VCC + 0.5V
−20 mA
+20 mA
−0.5V to VCC + 0.5V
± 50 mA
± 50 mA
−65˚C to +150˚C
2.0V to 6.0V
4.5V to 5.5V
0V to VCC
0V to VCC
−55˚C to +125˚C
125 mV/ns
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.
175˚C
DC Characteristics for ’AC Family Devices
Symbol
Parameter
VCC
54AC
TA =
(V)
−55˚C to +125˚C
Units
Conditions
Guaranteed
Limits
VIH
VIL
VOH
Minimum High
3.0
2.1
Level Input
4.5
3.15
Voltage
5.5
3.85
Maximum Low
3.0
0.9
Level Input
4.5
1.35
Voltage
5.5
1.65
Minimum High
3.0
2.9
Level Output
4.5
4.4
Voltage
5.5
5.4
VOUT = 0.1V
V
or VCC − 0.1V
VOUT = 0.1V
V
or VCC − 0.1V
IOUT = −50 µA
V
(Note 2)
VIN = VIL or VIH
VOL
3.0
2.4
4.5
3.7
5.5
4.7
Maximum Low
3.0
0.1
Level Output
4.5
0.1
Voltage
5.5
0.1
−12 mA
V
IOH
−24 mA
−24 mA
IOUT = 50 µA
V
(Note 2)
VIN = VIL or VIH
IIN
Maximum Input
3.0
0.50
4.5
0.50
5.5
0.50
5.5
± 1.0
12 mA
V
IOL
µA
24 mA
VI = VCC, GND
24 mA
Leakage Current
3
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DC Characteristics for ’AC Family Devices
Symbol
Parameter
(Continued)
VCC
54AC
TA =
(V)
−55˚C to +125˚C
Units
Conditions
Guaranteed
Limits
IOLD
IOHD
(Note 3) Minimum
Dynamic Output
Current
ICC
Maximum Quiescent
5.5
50
mA
VOLD = 1.65V Max
5.5
−50
mA
VOHD = 3.85V Min
5.5
80.0
µA
VIN = VCC
µA
or GND
VI(OE) = VIL, VIH
VI = VCC, GND
Supply Current
IOZT
Maximum I/O
Leakage Current
± 5.5
5.5
VO = VCC, GND
Note 2: All outputs loaded; thresholds on input associated with output under test.
Note 3: Maximum test duration 2.0 ms, one output loaded at a time.
Note 4: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC.
ICC for 54AC @ 25˚C is identical to 74AC @ 25˚C.
DC Characteristics for ’ACT Family Devices
Symbol
Parameter
VCC
54ACT
TA =
(V)
−55˚C to +125˚C
Units
Conditions
Guaranteed
Limits
VIH
VIL
VOH
Minimum High Level
4.5
2.0
Input Voltage
5.5
2.0
Maximum Low Level
4.5
0.8
Input Voltage
5.5
0.8
Minimum High Level
4.5
4.4
Output Voltage
5.5
5.4
V
VOUT = 0.1V
V
or VCC − 0.1V
VOUT = 0.1V
V
or VCC − 0.1V
IOUT = −50 µA
(Note 5)
VIN = VIL or VIH
VOL
4.5
3.70
5.5
4.70
Maximum Low Level
4.5
0.1
Output Voltage
5.5
0.1
V
IOH
−24 mA
−24 mA
V
IOUT = 50 µA
(Note 5)
VIN = VIL or VIH
IIN
ICCT
4.5
0.50
5.5
0.50
V
IOL
24 mA
Maximum Input Leakage
Current
5.5
± 1.0
µA
VI = VCC, GND
Maximum
5.5
1.6
mA
VI = VCC − 2.1V
5.5
50
mA
VOLD = 1.65V Max
5.5
−50
mA
VOHD = 3.85V Min
5.5
80.0
µA
VIN = VCC
24 mA
ICC/Input
IOLD
IOHD
(Note 6) Minimum
Dynamic Output
Current
ICC
Maximum Quiescent
Supply Current
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or GND
4
DC Characteristics for ’ACT Family Devices
Symbol
Parameter
(Continued)
VCC
54ACT
TA =
(V)
−55˚C to +125˚C
Units
Conditions
Guaranteed
Limits
IOZT
VI (OE) = VIL, VIH
VI = VCC, GND
VO = VCC, GND
Maximum I/O
Leakage Current
± 5.0
5.5
µA
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.
Note 7: ICC for 54ACT @ 25˚C is identical to 74ACT @ 25˚C.
AC Electrical Characteristics
54AC
TA = −55˚C
VCC
Symbol
Parameter
(V)
(Note 8)
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Fig.
to +125˚C
CL = 50 pF
Units
Min
Max
Propagation Delay
3.3
1.0
11.5
An to Bn or Bn to An
5.0
1.0
8.5
Propagation Delay
3.3
1.0
10.0
An to Bn or Bn to An
5.0
1.0
7.5
Output Enable Time
3.3
1.0
13.5
5.0
1.0
10.0
3.3
1.0
14.5
5.0
1.0
10.5
3.3
1.0
13.5
5.0
1.0
10.5
3.3
1.0
14.0
5.0
1.0
10.5
Output Enable Time
Output Disable Time
Output Disable Time
No.
ns
ns
ns
ns
ns
ns
Note 8: Voltage Range 3.3 is 3.3V ± 0.3V
Voltage Range 5.0 is 5.0V ± 0.5V
AC Electrical Characteristics
54ACT
TA = −55˚C
VCC
Symbol
Parameter
(V)
to +125˚C
CL = 50 pF
(Note 9)
tPLH
Propagation Delay
Units
Min
Max
5.0
1.0
9.0
ns
5.0
1.0
10.0
ns
An to Bn or Bn to An
tPHL
Propagation Delay
An to Bn or Bn to An
tPZH
Output Enable Time
5.0
1.0
12.0
ns
tPZL
Output Enable Time
5.0
1.0
13.0
ns
tPHZ
Output Disable Time
5.0
1.0
12.0
ns
tPLZ
Output Disable Time
5.0
1.0
12.0
ns
Note 9: Voltage Range 5.0 is 5.0V ± 0.5V
5
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Capacitance
Symbol
CIN
CI/O
Typ
Units
Input Capacitance
Parameter
4.5
pF
Input/Output
15.0
pF
Conditions
VCC = OPEN
VCC = 5.0V
45.0
pF
VCC = 5.0V
Capacitance
CPD
Power Dissipation
Capacitance
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6
Physical Dimensions
inches (millimeters) unless otherwise noted
20 Terminal Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
20-Lead Ceramic Dual-In-Line Package (D)
NS Package Number J20A
7
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54AC245 • 54ACT245 Octal Bidirectional Transceiver with TRI-STATE Inputs/Outputs
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
20-Lead Ceramic Flatpak (F)
NS Package Number W20A
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