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PDF 54ACT245 Data sheet ( Hoja de datos )
| Número de pieza | 54ACT245 | |
| Descripción | Octal Bidirectional Transceiver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 1998
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.
Features
n ICC and IOZ reduced 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
IEEE/IEC
DS100283-1
Pin
Names
OE
T/R
A0– A7
B0– B7
Description
Output Enable Input
Transmit/Receive Input
Side A TRI-STATE Inputs or TRI-STATE Outputs
Side B TRI-STATE Inputs or TRI-STATE Outputs
DS100283-2
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
1 page  
DC Characteristics for ’ACT Family Devices (Continued)
Symbol
Parameter
IOZT
Maximum I/O
Leakage Current
54ACT
VCC
TA =
(V) −55˚C to +125˚C
Guaranteed
Limits
5.5 ±5.0
Units
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.
Conditions
VI (OE) = VIL, VIH
VI = VCC, GND
VO = VCC, GND
AC Electrical Characteristics
Symbol
Parameter
tPLH
tPHL
tPZH
Propagation Delay
An to Bn or Bn to An
Propagation Delay
An to Bn or Bn to An
Output Enable Time
tPZL Output Enable Time
tPHZ Output Disable Time
tPLZ Output Disable Time
Note 8: Voltage Range 3.3 is 3.3V ±0.3V
Voltage Range 5.0 is 5.0V ±0.5V
VCC
(V)
(Note 8)
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
54AC
TA = −55˚C
to +125˚C
CL = 50 pF
Min Max
1.0 11.5
1.0 8.5
1.0 10.0
1.0 7.5
1.0 13.5
1.0 10.0
1.0 14.5
1.0 10.5
1.0 13.5
1.0 10.5
1.0 14.0
1.0 10.5
Units
ns
ns
ns
ns
ns
ns
Fig.
No.
AC Electrical Characteristics
Symbol
Parameter
tPLH Propagation Delay
An to Bn or Bn to An
tPHL Propagation Delay
An to Bn or Bn to An
tPZH
Output Enable Time
tPZL Output Enable Time
tPHZ Output Disable Time
tPLZ Output Disable Time
Note 9: Voltage Range 5.0 is 5.0V ±0.5V
VCC
(V)
(Note 9)
5.0
5.0
5.0
5.0
5.0
5.0
54ACT
TA = −55˚C
to +125˚C
CL = 50 pF
Min Max
1.0 9.0
1.0 10.0
1.0 12.0
1.0 13.0
1.0 12.0
1.0 12.0
Units
ns
ns
ns
ns
ns
ns
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 54ACT245.PDF ] | |
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