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PDF 54ACTQ245 Data sheet ( Hoja de datos )
| Número de pieza | 54ACTQ245 | |
| Descripción | Quiet Series Octal Bidirectional Transceiver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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September 1998
54ACQ245 • 54ACTQ245
Quiet Series Octal Bidirectional Transceiver with
TRI-STATE® Inputs/Outputs
General Description
The ’ACQ/’ACTQ245 contains eight non-inverting bidirec-
tional 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.
The ’ACQ/’ACTQ utilizes NSC Quiet Series technology to
guarantee quiet output switching and improve dynamic
threshold performance. FACT Quiet Series™ features
GTO™ output control and undershoot corrector in addition to
a split ground bus for superior performance.
Features
n ICC and IOZ reduced by 50%
n Guaranteed simultaneous switching noise level and
dynamic threshold performance
n Improved latch-up immunity
n TRI-STATE outputs drive bus lines or buffer memory
address registers
n Outputs source/sink 24 mA
n Faster prop delays than the standard ’ACT245
n 4 kV minimum ESD immunity (’ACQ)
n Standard Military Drawing (SMD)
— ’ACTQ245: 5962-92187
— ’ACQ245: 5962-92177
Logic Symbols
IEEE/IEC
DS100237-1
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
GTO™ is a trademark of National Semiconductor Corporation.
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACT® is a registered trademark of Fairchild Semiconductor Corporation.
FACT Quiet Series™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100237
DS100237-2
www.national.com
1 page  
DC Characteristics for ’ACTQ Family Devices (Continued)
54ACTQ
Symbol
Parameter
VCC
TA =
(V) −55˚C to +125˚C
Guaranteed Limits
ICCT
IOLD
IOHD
Maximum
ICC/Input
(Note 7) Minimum
Dynamic Output
Current
5.5
5.5
5.5
1.6
50
−50
ICC
Maximum Quiescent
5.5
Supply Current
80.0
VOLP
VOLV
Quiet Output
Maximum Dynamic
VOL
Quiet Output
Minimum Dynamic
VOL
5.0
5.0
1.65
−1.2
Note 6: All outputs loaded; thresholds on input associated with output under test.
Note 7: Maximum test duration 2.0 ms, one output loaded at a time.
Note 8: Max number of outputs defined as (n). n−1 Data Inputs are driven 0V to 3V; one output @ GND.
Units
mA
mA
mA
µA
V
V
AC Electrical Characteristics for ’ACQ Devices
Symbol
Parameter
tPHL, tPLH
tPZL, tPZH
Propagation Delay
Data to Output
Output Enable Time
tPHZ, tPLZ
Output Disable Time
Note 9: Voltage Range 5.0 is 5.0V ±0.5V
Voltage Range 3.3 is 3.3V ±0.3V
VCC
(V)
(Note 9)
3.0
4.5
3.0
4.5
3.0
4.5
54ACQ
TA = −55˚C
to +125˚C
CL = 50 pF
Min
1.5
1.5
1.5
1.5
1.5
1.5
Max
11.5
10.0
13.0
10.0
13.0
10.0
Conditions
VI = VCC − 2.1V
VOLD = 1.65V Max
VOHD = 3.85V Min
VIN = VCC
or GND
(Note 8)
(Note 8)
Units
Fig.
No.
ns
ns
ns
5 www.national.com
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 54ACTQ245.PDF ] | |
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