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54FCT245
Octal Bidirectional Transceiver with TRI-STATE
®
Outputs
General Description
The ’FCT245 contains eight non-inverting bidirectional buffers withTRI-STATE outputs and is intended for bus-oriented
applications. Current sinking capability is 48 mA on 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 datafromAports 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 TTL input and output level compatible
n A and B output sink capability of 48 mA, source
capability of 12 mA
n CMOS power consumption
n Standard Microcircuit Drawing (SMD) 5962-8762901
Ordering Code:
Military Package Package Description
Number
54FCT245DMQB J20A 20-Lead Ceramic Dual-In-Line
54FCT245FMQB W20A 20-Lead Cerpak
54FCT245LMQB E20A 20-Lead Ceramic Leadless Chip Carrier, Type C
Logic Symbol
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
DS100950-1
August 1998
54FCT245 Octal Bidirectional Transceiver with TRI-STATE Outputs
© 1998 National Semiconductor Corporation DS100950 www.national.com
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Connection Diagrams
Pin Descriptions
Pin Names Description
OE
Output Enable Input (Active LOW)
T/R
Transmit/Receive Input
A
0–A7
Side A Inputs or TRI-STATE Outputs
B
0–B7
Side B Inputs or TRI-STATE Outputs
Truth Table
Inputs Output
OE
T/R
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
Logic Diagram
Pin Assignment for DIP
and Flatpak.
DS100950-5
Pin Assignment for LCC
DS100950-3
DS100950-4
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature −65˚C to +150˚C
Ambient Temperature under Bias −55˚C to +125˚C
Junction Temperature under Bias
Ceramic −55˚C to +175˚C
V
CC
Pin Potential to
Ground Pin −0.5V to +7.0V
Input Voltage (Note 2) −0.5V to +7.0V
Input Current (Note 2) −30 mA to +5.0 mA
Voltage Applied to Any Output
in the Disabled or
Power-off State −0.5V to 5.5V
in the HIGH State −0.5V to V
CC
Current Applied to Output
in LOW State (Max) twice the rated I
OL
(mA)
Recommended Operating
Conditions
Free Air Ambient Temperature
Military −55˚C to +125˚C
Supply Voltage
Military +4.5V to +5.5V
Note 1: Absolutemaximumratings are values beyond which the device may
be damaged or have its useful life impaired. Functional operation under these
conditions is not implied.
Note 2: Either voltage limit or current limit is sufficient to protect inputs.
DC Electrical Characteristics
Symbol Parameter FCT245
Units V
CC
Conditions
Min Max
V
IH
Input HIGH Voltage 2.0 V Recognized HIGH Signal
V
IL
Input LOW Voltage 0.8 V Recognized LOW Signal
V
CD
Input Clamp Diode Voltage −1.2 V Min I
IN
=
−18 mA (OE, T/R)
V
OH
Output HIGH
Voltage
54FCT 4.3 V Min I
OH
=
−300 uA (A
n,Bn
)
54FCT 2.4 V Min I
OH
=
−12 mA (A
n,Bn
)
V
OL
Output LOW
Voltage
54FCT 0.2 V Min I
OL
=
300 uA (A
n,Bn
)
54FCT 0.55 V Min I
OL
=
48 mA (A
n,Bn
)
I
IH
Input HIGH Current 5
µA Max
V
IN
=
2.7V (OE, T/R)
5V
IN
=
V
CC
(OE, T/R)
I
BVIT
Input HIGH Current Breakdown Test
(I/O)
20 µA Max
V
IN
=
5.5V (A
n,Bn
)
I
IL
Input LOW Current −5 µA Max V
IN
=
0.0V (OE, T/R)
I
OS
Output Short-Circuit Current −60 mA Max V
OUT
=
0.0V (A
n,Bn
)
I
CCQ
Power Supply Current
1.5 mA Max
VIN= 0.2V or VIN= 5.3V, VCC=
5.5V
∆I
CC
Power Supply Current 2.0 mA Max VCC= 5.5V, VIN= 3.4V
I
CCT
Total Power Supply Current
6.0 mA
V
IN
=
3.4V or V
IN
= GND, OE =
T/R = GND, VCC= 5.5V, fI=
10Mhz, outputs open, one bit
toggling - 50%duty cycle
5.5 mA Max
V
IN
=
5.3V or V
IN
= 0.2V,OE =
T/R = GND, VCC= 5.5V, fI=
10Mhz, outputs open, one bit
toggling - 50%duty cycle
I
CCD
Dynamic I
CC
(Note 3) 0.4
mA/
MHz
Max
Outputs Open, OE=GND, T/R
=
GND or VCCOne Bit Toggling,
50%Duty Cycle
Note 3: Guaranteed but not tested.
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AC Electrical Characteristics
Symbol Parameter 54FCT Units Fig.
No.
T
A
=
−55˚C to +125˚C
V
CC
=
4.5V–5.5V
C
L
=
50 pF
Min Max
t
PLH
Propagation Delay 1.5 7.5
ns
Figure
4
t
PHL
Data to Outputs 1.5 7.5
t
PZH
Output Enable 1.5 10.0
ns
Figure
5
t
PZL
Time 1.5 10.0
t
PHZ
Output Disable 1.5 10.0
ns
Figure
5
t
PLZ
Time 1.5 10.0
Capacitance
Symbol Parameter Max Units Conditions
T
A
=
25˚C
C
IN
Input Capacitance 10.0 pF V
CC
=
0V (OE , T/R)
C
I/O
(Note 4) I/O Capacitance 12.0 pF V
CC
=
5.0V (A
n,Bn
)
Note 4: C
I/O
is measured at frequency f=1 MHz, per MIL-STD-883B, Method 3012.
AC Loading
DS100950-6
*
Includes jig and probe capacitance
FIGURE 1. Standard AC Test Load
DS100950-7
FIGURE 2. Test Input Signal Levels
Amplitude Rep. Rate t
w
t
r
t
f
3.0V 1 MHz 500 ns 2.5 ns 2.5 ns
FIGURE 3. Test Input Signal Requirements
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AC Waveforms
DS100950-8
FIGURE 4. Propagation Delay Waveforms
for Inverting and Non-Inverting Functions
DS100950-10
FIGURE 5. TRI-STATE Output HIGH
and LOW Enable and Disable Times
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Physical Dimensions inches (millimeters) unless otherwise noted
20-Terminal Ceramic Chip Carrier (L)
NS Package Number E20A
20-Lead Ceramic Dual-In-Line Package (D)
NS Package Number J20A
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into
the body, or (b) supportor sustain life, and whose failure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to resultin asignificant injury
to the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be reasonably expected to cause the failureof the life support
device or system, or toaffect itssafety or effectiveness.
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Tel: 1-800-272-9959
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20-Lead Ceramic Flatpak (F)
NS Package Number W20A
54FCT245 Octal Bidirectional Transceiver with TRI-STATE Outputs
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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