54ACT245 [TI]
54AC245 54ACT245 Octal Bidirectional Transceiver with TRI-STATE Inputs/Outputs; 54AC245 54ACT245八路双向收发器与三态输入/输出
| 型号： | 54ACT245 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 54AC245 54ACT245 Octal Bidirectional Transceiver with TRI-STATE Inputs/Outputs |
| 文件： | 总10页 (文件大小：197K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
54AC245,54ACT245
54AC245 54ACT245 Octal Bidirectional Transceiver with TRI-STATE
Inputs/Outputs
Literature Number: SNOS099
August 1998
54AC245 • 54ACT245
Octal Bidirectional Transceiver with TRI-STATE®
Inputs/Outputs
General Description
Features
n ICC and IOZ reduced by 50%
n Noninverting buffers
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.
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
IEEE/IEC
DS100283-1
DS100283-2
Pin
Description
Names
OE
Output Enable Input
T/R
Transmit/Receive Input
A0–A7
B0–B7
Side A TRI-STATE Inputs or TRI-STATE Outputs
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
Connection Diagrams
Pin Assignment for
DIP and Flatpak
Pin Assignment for LCC
DS100283-4
Truth Table
Inputs
Outputs
OE
L
T/R
L
DS100283-3
Bus B Data to Bus A
Bus A Data to Bus B
HIGH-Z State
L
H
H
X
=
=
=
H
L
X
HIGH Voltage Level
LOW Voltage Level
Immaterial
www.national.com
2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Recommended Operating
Conditions
Supply Voltage (VCC
)
’AC
2.0V to 6.0V
4.5V to 5.5V
0V to VCC
Supply Voltage (VCC
)
−0.5V to +7.0V
’ACT
DC Input Diode Current (IIK
)
Input Voltage (VI)
=
VI −0.5V
−20 mA
+20 mA
Output Voltage (VO
)
0V to VCC
=
VI VCC + 0.5V
Operating Temperature (TA)
54AC/ACT
DC Input Voltage (VI)
−0.5V to VCC + 0.5V
−55˚C to +125˚C
125 mV/ns
DC Output Diode Current (IOK
)
Minimum Input Edge Rate (∆V/∆t)
’AC Devices
=
VO −0.5V
−20 mA
+20 mA
=
VO VCC + 0.5V
% to 70% of V
VIN from 30
CC
DC Output Voltage (VO
DC Output Source
)
−0.5V to VCC + 0.5V
@
VCC 3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (∆V/∆t)
’ACT Devices
±
±
or Sink Current (IO
)
50 mA
DC VCC or Ground Current
per Output Pin (ICC or IGND
VIN from 0.8V to 2.0V
)
50 mA
@
VCC 4.5V, 5.5V
125 mV/ns
Storage Temperature (TSTG
Junction Temperature (TJ)
CDIP
)
−65˚C to +150˚C
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 recom-
mend operation of FACT® circuits outside databook specifications.
175˚C
DC Characteristics for ’AC Family Devices
54AC
=
Symbol
Parameter
VCC
(V)
TA
Units
Conditions
−55˚C to +125˚C
Guaranteed
Limits
2.1
=
VIH
Minimum High
Level Input
Voltage
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
VOUT 0.1V
3.15
3.85
0.9
V
V
V
or VCC − 0.1V
=
VIL
Maximum Low
Level Input
Voltage
VOUT 0.1V
1.35
1.65
2.9
or VCC − 0.1V
=
VOH
Minimum High
Level Output
Voltage
IOUT −50 µA
4.4
5.4
(Note 2)
=
VIN VIL or VIH
3.0
4.5
5.5
3.0
4.5
5.5
2.4
3.7
4.7
0.1
0.1
0.1
−12 mA
V
V
IOH
−24 mA
−24 mA
=
IOUT 50 µA
VOL
Maximum Low
Level Output
Voltage
(Note 2)
=
VIN VIL or VIH
3.0
4.5
5.5
5.5
0.50
0.50
0.50
12 mA
V
IOL
24 mA
24 mA
=
VI VCC, GND
±
IIN
Maximum Input
Leakage Current
1.0
µA
3
www.national.com
DC Characteristics for ’AC Family Devices (Continued)
54AC
=
Symbol
Parameter
VCC
(V)
TA
Units
Conditions
−55˚C to +125˚C
Guaranteed
Limits
=
VOLD 1.65V Max
IOLD
IOHD
ICC
(Note 3) Minimum
Dynamic Output
Current
5.5
5.5
5.5
50
mA
mA
µA
=
VOHD 3.85V Min
−50
=
Maximum Quiescent
Supply Current
Maximum I/O
80.0
VIN VCC
or GND
=
IOZT
VI(OE) VIL, VIH
=
±
Leakage Current
5.5
5.5
µA
VI VCC, GND
=
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:
I
and I
CC
3.0V are guaranteed to be less than or equal to the respective limit 5.5V V .
IN
CC
@
@
I
for 54AC 25˚C is identical to 74AC 25˚C.
CC
DC Characteristics for ’ACT Family Devices
54ACT
=
Symbol
Parameter
VCC
(V)
TA
Units
Conditions
−55˚C to +125˚C
Guaranteed
Limits
2.0
=
VIH
VIL
Minimum High Level
Input Voltage
4.5
5.5
4.5
5.5
4.5
5.5
V
V
V
VOUT 0.1V
2.0
or VCC − 0.1V
=
Maximum Low Level
Input Voltage
0.8
VOUT 0.1V
0.8
or VCC − 0.1V
=
VOH
Minimum High Level
Output Voltage
4.4
IOUT −50 µA
5.4
(Note 5)
=
VIN VIL or VIH
IOH −24 mA
−24 mA
4.5
5.5
4.5
5.5
3.70
4.70
0.1
V
V
=
VOL
Maximum Low Level
Output Voltage
IOUT 50 µA
0.1
(Note 5)
=
VIN VIL or VIH
IOL 24 mA
24 mA
VI VCC, GND
4.5
5.5
5.5
0.50
0.50
V
=
±
IIN
Maximum Input Leakage
Current
1.0
µA
=
VI VCC − 2.1V
ICCT
Maximum
5.5
1.6
mA
I
CC/Input
=
VOLD 1.65V Max
IOLD
IOHD
ICC
(Note 6) Minimum
Dynamic Output
Current
5.5
5.5
5.5
50
mA
mA
µA
=
VOHD 3.85V Min
−50
80.0
=
Maximum Quiescent
Supply Current
VIN VCC
or GND
www.national.com
4
DC Characteristics for ’ACT Family Devices (Continued)
54ACT
=
Symbol
Parameter
VCC
(V)
TA
Units
Conditions
−55˚C to +125˚C
Guaranteed
Limits
=
IOZT
Maximum I/O
Leakage Current
VI (OE) VIL, VIH
=
±
5.5
5.0
µA
VI VCC, GND
=
VO VCC, GND
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.
@ @
I for 54ACT 25˚C is identical to 74ACT 25˚C.
CC
Note 7:
AC Electrical Characteristics
54AC
=
VCC
(V)
TA −55˚C
Fig.
Symbol
Parameter
to +125˚C
Units
No.
=
CL 50 pF
(Note 8)
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Propagation Delay
An to Bn or Bn to An
Propagation Delay
An to Bn or Bn to An
Output Enable Time
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
11.5
8.5
ns
ns
ns
ns
ns
ns
10.0
7.5
13.5
10.0
14.5
10.5
13.5
10.5
14.0
10.5
Output Enable Time
Output Disable Time
Output Disable Time
±
Note 8: Voltage Range 3.3 is 3.3V 0.3V
±
Voltage Range 5.0 is 5.0V 0.5V
AC Electrical Characteristics
54ACT
=
VCC
(V)
TA −55˚C
Symbol
Parameter
to +125˚C
Units
=
CL 50 pF
(Note 9)
Min
Max
tPLH
Propagation Delay
An to Bn or Bn to An
Propagation Delay
An to Bn or Bn to An
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
5.0
1.0
9.0
ns
ns
tPHL
5.0
1.0
10.0
tPZH
tPZL
tPHZ
tPLZ
5.0
5.0
5.0
5.0
1.0
1.0
1.0
1.0
12.0
13.0
12.0
12.0
ns
ns
ns
ns
±
Note 9: Voltage Range 5.0 is 5.0V 0.5V
5
www.national.com
Capacitance
Symbol
Parameter
Typ
4.5
Units
pF
Conditions
=
VCC OPEN
CIN
Input Capacitance
Input/Output
=
VCC 5.0V
CI/O
15.0
pF
Capacitance
=
VCC 5.0V
CPD
Power Dissipation
Capacitance
45.0
pF
www.national.com
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
www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Ceramic Flatpak (F)
NS Package Number W20A
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with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
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device or system whose failure to perform can be rea-
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