54F 74F545 Octal Bidirectional Transceiver with TRI-STATE Outputs
May 1995
54F 74F545 Octal Bidirectional
Transceiver with TRI-STATE Outputs
General Description
The ’F545 is an 8-bit TRI-STATE high-speed transceiver It
provides bidirectional drive for bus-oriented microprocessor
and digital communications systems Straight through bidi-
rectional transceivers are featured with 24 mA (20 mA Mil)
bus drive capability on the A ports and 64 mA (48 mA Mil)
bus drive capability on the B ports
One input Transmit Receive (T R) determines the direction
of logic signals through the bidirectional transceiver Trans-
mit enables data from A ports to B ports Receive enables
data from B ports to A ports The Output Enable input dis-
ables both A and B ports by placing them in a TRI-STATE
condition
Features
Y
Y
Y
Y
Y
Y
Y
Higher drive than 8304
8-bit bidirectional data flow reduces system package
count
TRI-STATE inputs outputs for interfacing with bus-ori-
ented systems
24 mA (20 mA Mil) and 64 mA (48 mA Mil) bus drive
capability on A and B ports respectively
Transmit Receive and Output Enable simplify control
logic
Guaranteed 4000V minimum ESD protection
Pin for Pin compatible with Intel 8286
Commercial
74F545PC
Military
Package
Number
N20A
Package Description
20-Lead (0 300 Wide) Molded Dual-In-Line
20-Lead Ceramic Dual-In-Line
20-Lead (0 300 Wide) Molded Small Outline JEDEC
20-Lead (0 300 Wide) Molded Small Outline EIAJ
20-Lead Cerpack
20-Lead Ceramic Leadless Chip Carrier Type C
54F545DM (Note 2)
74F545SC (Note 1)
74F545SJ (Note 1)
54F545FM (Note 2)
54F545LM (Note 2)
J20A
M20B
M20D
W20A
E20A
Note 1
Devices also available in 13 reel Use suffix
e
SCX and SJX
Note 2
Military grade device with environmental and burn-in processing Use suffix
e
DMQB FMQB and LMQB
Logic Symbols
TL F 9556 – 3
IEEE IEC
TL F 9556 – 5
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 9556
RRD-B30M105 Printed in U S A
Connection Diagrams
Pin Assignment for
DIP SOIC and Flatpak
Pin Assignment
for LCC
TL F 9556 – 2
TL F 9556– 1
Truth Table
Inputs
OE
L
L
H
T R
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
High Z
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
Z
e
High Impedance
Outputs
Unit Loading Fan Out
54F 74F
Pin Names
OE
T R
A
0
–A
7
B
0
–B
7
Description
UL
HIGH LOW
Input I
IH
I
IL
Output I
OH
I
OL
Output Enable Input (Active LOW)
10 20
20
mA
b
1 2 mA
Transmit Receive Input
10 20
20
mA
b
1 2 mA
Side A TRI-STATE Inputs or
3 5 1 083
70
mA
b
650
mA
TRI-STATE Outputs
150 40 (33 3)
b
3 mA 24 mA (20 mA)
Side B TRI-STATE Inputs or
3 5 1 083
70
mA
b
650
mA
TRI-STATE Outputs
600 106 6 (80)
b
12 mA 64 mA (48 mA)
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
b
65 C to
a
150 C
Storage Temperature
Ambient Temperature under Bias
Junction Temperature under Bias
Plastic
V
CC
Pin Potential to
Ground Pin
Input Voltage (Note 2)
Input Current (Note 2)
Voltage Applied to Output
in HIGH State (with V
CC
e
0V)
Standard Output
TRI-STATE Output
Current Applied to Output
in LOW State (Max)
ESD Last Passing Voltage (Min)
b
55 C to
a
125 C
b
55 C to
a
175 C
b
55 C to
a
150 C
b
0 5V to
a
7 0V
b
0 5V to
a
7 0V
b
30 mA to
a
5 0 mA
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
Recommended Operating
Conditions
Free Air Ambient Temperature
Military
Commercial
Supply Voltage
Military
Commercial
b
55 C to
a
125 C
0 C to
a
70 C
a
4 5V to
a
5 5V
a
4 5V to
a
5 5V
b
0 5V to V
CC
b
0 5V to
a
5 5V
twice the rated I
OL
(mA)
4000V
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
CD
V
OH
Parameter
Min
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH
Voltage
54F 10% V
CC
54F 10% V
CC
54F 10% V
CC
74F 10% V
CC
74F 10% V
CC
74F 10% V
CC
74F 5% V
CC
74F 5% V
CC
54F 10% V
CC
54F 10% V
CC
74F 10% V
CC
74F 10% V
CC
54F
74F
54F
74F
54F
74F
54F
74F
74F
74F
4 75
3 75
b
1 2
54F 74F
Typ
Max
20
08
b
1 2
Units
V
V
V
V
CC
Conditions
Recognized as a HIGH Signal
Recognized as a LOW Signal
Min
I
IN
e b
18 mA (OE T R)
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OL
I
OL
I
OL
I
OL
e
e
e
e
e
e
e
e
e
e
e
e
b
1 mA (A
n
)
b
3 mA (A
n
)
b
12 mA (B
n
)
b
1 mA (A
n
)
b
3 mA (A
n
)
b
15 mA (B
n
)
b
1 mA (A
n
)
b
3 mA (A
n
)
25
24
20
25
24
20
27
27
05
0 55
05
0 55
20 0
50
100
70
10
05
250
50
V
Min
V
OL
Output LOW
Voltage
V
Min
20 mA (A
n
)
48 mA (B
n
)
24 mA (A
n
)
64 mA (B
n
)
I
IH
I
BVI
I
BVIT
I
CEX
V
ID
I
OD
I
IL
I
IH
a
I
OZH
I
IL
a
I
OZL
I
OS
Input HIGH
Current
Input HIGH Current
Breakdown Test
Input HIGH Current
Breakdown (I O)
Output HIGH
Leakage Current
Input Leakage
Test
Output Leakage
Circuit Current
Input LOW Current
mA
mA
mA
mA
V
mA
mA
mA
mA
mA
Max
Max
Max
Max
00
00
Max
Max
Max
Max
V
IN
e
2 7V (OE T R)
V
IN
e
7 0V (OE T R)
V
IN
e
5 5V (A
n
B
n
)
V
OUT
e
V
CC
I
ID
e
1 9
mA
All Other Pins Grounded
V
IOD
e
150 mV
All Other Pins Grounded
V
IN
e
0 5V (OE T R)
V
OUT
e
2 7V (A
n
B
n
)
V
OUT
e
0 5V (A
n
B
n
)
V
OUT
e
0V (A
n
)
V
OUT
e
0V (B
n
)
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
b
60
b
100
70
b
650
b
150
b
225
3
DC Electrical Characteristics
(Continued)
Symbol
I
ZZ
I
CCH
I
CCL
I
CCZ
Parameter
Min
Bus Drainage Test
Power Supply Current
Power Supply Current
Power Supply Current
70
95
85
54F 74F
Typ
Max
500
90
120
110
mA
mA
mA
mA
Units
V
CC
0 0V
Max
Max
Max
Conditions
V
OUT
e
5 25V
V
O
e
HIGH
V
O
e
LOW
V
O
e
HIGH Z
AC Electrical Characteristics
74F
Symbol
Parameter
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
A
n
to B
n
or B
n
to A
n
Output Enable Time
Output Disable Time
25
25
30
35
30
20
T
A
e a
25 C
V
CC
e a
5 0V
C
L
e
50 pF
Typ
42
46
53
60
50
50
Max
60
60
70
80
65
65
54F
T
A
V
CC
e
Mil
C
L
e
50 pF
Min
20
20
25
30
25
20
Max
75
75
90
10 0
90
10 0
74F
T
A
V
CC
e
Com
C
L
e
50 pF
Min
25
25
30
35
30
20
Max
70
70
80
90
75
75
ns
Units
ns
Logic Diagram
TL F 9556 – 4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
Ordering Information
The device number is used to form part of a simplified purchasing code where the package type and temperature range are
defined as follows
74F 545 S C X
Temperature Range Family
74F
e
Commercial
54F
e
Military
Device Type
Package Code
P
e
Plastic DIP
D
e
Ceramic DIP
F
e
Flatpak
L
e
Leadless Chip Carrier (LCC)
S
e
Small Outline SOIC JEDEC
SJ
e
Small Outline SOIC EIAJ
4
Special Variations
QB
e
Military grade device with
environmental and burn-in
processing
X
e
Devices shipped in 13 reel
Temperature Range
C
e
Commercial (0 C to
a
70 C)
M
e
Military (
b
55 C to
a
125 C)
Physical Dimensions
inches (millimeters)
20-Lead Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
20-Lead Ceramic Dual-In-Line Package (D)
NS Package Number J20A
5
电源技术
