NSC 54FCT245LMQB

54FCT245
Octal Bidirectional Transceiver with TRI-STATE ® Outputs
General Description
Features
The ’FCT245 contains eight non-inverting bidirectional buffers with TRI-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 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 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
DS100950-1
TRI-STATE ® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS100950
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54FCT245 Octal Bidirectional Transceiver with TRI-STATE Outputs
August 1998
Connection Diagrams
Pin Assignment for DIP
and Flatpak.
Pin Assignment for LCC
DS100950-3
Pin Descriptions
DS100950-5
Pin Names
Description
OE
Output Enable Input (Active LOW)
T/R
Transmit/Receive Input
A0–A7
Side A Inputs or TRI-STATE Outputs
B0–B7
Side B Inputs or TRI-STATE Outputs
Truth Table
Inputs
OE
Output
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
DS100950-4
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2
Absolute Maximum Ratings (Note 1)
in the HIGH State
Current Applied to Output
in LOW State (Max)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature
Ambient Temperature under Bias
Junction Temperature under Bias
Ceramic
VCC Pin Potential to
Ground Pin
Input Voltage (Note 2)
Input Current (Note 2)
Voltage Applied to Any Output
in the Disabled or
Power-off State
−0.5V to VCC
twice the rated IOL (mA)
Recommended Operating
Conditions
−65˚C to +150˚C
−55˚C to +125˚C
Free Air Ambient Temperature
Military
Supply Voltage
Military
−55˚C to +175˚C
−0.5V to +7.0V
−0.5V to +7.0V
−30 mA to +5.0 mA
−55˚C to +125˚C
+4.5V to +5.5V
Note 1: Absolute maximum ratings 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.
−0.5V to 5.5V
DC Electrical Characteristics
Symbol
Parameter
FCT245
Min
Max
Units
VCC
VIH
Input HIGH Voltage
VIL
Input LOW Voltage
VCD
Input Clamp Diode Voltage
VOH
Output HIGH
Voltage
54FCT
4.3
V
Min
54FCT
2.4
V
Min
Output LOW
Voltage
54FCT
0.2
V
Min
54FCT
0.55
V
Min
µA
Max
µA
Max
VOL
IIH
2.0
Input HIGH Current
V
Recognized HIGH Signal
0.8
V
−1.2
V
Recognized LOW Signal
IIN = −18 mA (OE, T/R)
5
5
Min
IBVIT
Input HIGH Current Breakdown Test
(I/O)
IIL
Input LOW Current
−5
µA
Max
IOS
Output Short-Circuit Current
−60
mA
Max
ICCQ
Power Supply Current
1.5
mA
Max
∆ICC
Power Supply Current
2.0
mA
Max
ICCT
Total Power Supply Current
6.0
mA
5.5
mA
Max
0.4
mA/
MHz
Max
ICCD
20
Dynamic ICC
(Note 3)
Conditions
IOH = −300 uA (An, Bn)
IOH = −12 mA (An, Bn)
IOL = 300 uA (An, Bn)
IOL = 48 mA (An, Bn)
VIN = 2.7V (OE, T/R)
VIN = VCC (OE, T/R)
VIN = 5.5V (An, Bn)
VIN = 0.0V (OE, T/R)
VOUT = 0.0V (An, Bn)
VIN = 0.2V or VIN = 5.3V, VCC =
5.5V
VCC = 5.5V, VIN = 3.4V
VIN = 3.4V or VIN = GND, OE =
T/R = GND, VCC = 5.5V, fI =
10Mhz, outputs open, one bit
toggling - 50% duty cycle
VIN = 5.3V or VIN = 0.2V,OE =
T/R = GND, VCC = 5.5V, fI =
10Mhz, outputs open, one bit
toggling - 50% duty cycle
Outputs Open, OE = GND, T/R =
GND or VCC One Bit Toggling,
50% Duty Cycle
Note 3: Guaranteed but not tested.
3
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AC Electrical Characteristics
Symbol
Parameter
54FCT
TA = −55˚C to +125˚C
VCC = 4.5V–5.5V
Units
Fig.
No.
CL = 50 pF
Min
Max
7.5
tPLH
Propagation Delay
1.5
tPHL
Data to Outputs
1.5
7.5
tPZH
Output Enable
1.5
10.0
tPZL
Time
1.5
10.0
tPHZ
Output Disable
1.5
10.0
tPLZ
Time
1.5
10.0
ns
Figure
4
ns
Figure
5
ns
Figure
5
Capacitance
Symbol
Parameter
Max
Units
CIN
Input Capacitance
10.0
pF
CI/O (Note 4)
I/O Capacitance
12.0
pF
Conditions
TA = 25˚C
VCC = 0V (OE , T/R)
VCC = 5.0V (An, Bn)
Note 4: CI/O is measured at frequency f = 1 MHz, per MIL-STD-883B, Method 3012.
AC Loading
DS100950-6
DS100950-7
*Includes jig and probe capacitance
FIGURE 2. Test Input Signal Levels
FIGURE 1. Standard AC Test Load
Amplitude
Rep. Rate
tw
tr
tf
3.0V
1 MHz
500 ns
2.5 ns
2.5 ns
FIGURE 3. Test Input Signal Requirements
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4
AC Waveforms
DS100950-8
DS100950-10
FIGURE 4. Propagation Delay Waveforms
for Inverting and Non-Inverting Functions
FIGURE 5. TRI-STATE Output HIGH
and LOW Enable and Disable Times
5
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6
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
7
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54FCT245 Octal Bidirectional Transceiver with TRI-STATE Outputs
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
20-Lead Ceramic Flatpak (F)
NS Package Number W20A
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be reasonably expected to result in a significant injury
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