74F545SC

© 1999 Fairchild Semiconductor Corporation DS009556 www.fairchildsemi.com
April 1988
Revised August 1999
74F545 Octal Bidirectional Transceiver with 3-STATE Outputs
74F545
Octal Bidirectional Transceiver with 3-STATE Outputs
General Description
The 74F545 is an 8-bit, 3-STATE, high-speed transceiver. It
provides bidirectional drive for bus-oriented microproces-
sor and digital communications systems. Straight through
bidirectional transceivers are featured, with 24 mA bus
drive capability on the A Ports and 64 mA bus drive capa-
bility 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-to-B Ports; Receive enables data
from B-to-A Ports. The Output Enable input disables both A
and B Ports by placing them in a 3-STATE condition.
Features
Higher drive than 8304
8-bit bidirectional data flow reduces system package
count
3-STATE inputs/outputs for interfacing with bus-oriented
systems
24 mA and 64 mA bus drive capability on A and B Ports,
respectively
Transmit/Receive and Output Enable simplify control
logic
Guaranteed 4000V minimum ESD protection
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
IEEE/IEC
Connection Diagram
Order Number Package Number Package Description
74F545SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74F545PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
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74F545
Unit Loading/Fan Out
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Pin Names Description
U.L.
Input I
IH
/I
IL
HIGH/LOW
Output I
OH
/I
OL
OE Output Enable Input (Active LOW) 1.0/2.0 20 µA/1.2 mA
T/R
Transmit/Receive Input 1.0/2.0 20 µA/1.2 mA
A
0
–A
7
Side A 3-STATE Inputs or 3.5/1.083 70 µA/650 µA
3-STATE Outputs 150/40 (33.3) 3 mA/24 mA (20 mA)
B
0
–B
7
Side B 3-STATE Inputs or 3.5/1.083 70 µA/650 µA
3-STATE Outputs 600/106.6 (80) 12 mA/64 mA (48 mA)
Inputs Outputs
OE
T/R
L L Bus B Data to Bus A
L H Bus A Data to Bus B
HXHigh Z
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74F545
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
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.
DC Electrical Characteristics
Storage Temperature 65°C to +150°C
Ambient Temperature under Bias 55°C to +125°C
Junction Temperature under Bias 55°C to +150C
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 Output
in HIGH State (with V
CC
= 0V)
Standard Output 0.5V to V
CC
3-STATE Output 0.5V to +5.5V
Current Applied to Output
in LOW State (Max) twice the rated I
OL
(mA)
ESD Last Passing Voltage (Min) 4000V
Free Air Ambient Temperature 0°C to +70°C
Supply Voltage +4.5V to +5.5V
Symbol Parameter Min Typ Max Units
V
CC
Conditions
V
IH
Input HIGH Voltage 2.0 V Recognized as a HIGH Signal
V
IL
Input LOW Voltage 0.8 V Recognized as a LOW Signal
V
CD
Input Clamp Diode Voltage 1.2 V Min I
IN
= 18 mA (OE, T/R)
V
OH
Output HIGH 10% V
CC
2.5
VMin
I
OH
= 1 mA (A
n
)
Voltage 10% V
CC
2.4 I
OH
= 3 mA (A
n
)
10% V
CC
2.0 I
OH
= 15 mA (B
n
)
5% V
CC
2.7 I
OH
= 1 mA (A
n
)
5% V
CC
2.7 I
OH
= 3 mA (A
n
)
V
OL
Output LOW 10% V
CC
0.5
VMin
I
OL
= 24 mA (A
n
)
Voltage 10% V
CC
0.55 I
OL
= 64 mA (B
n
)
I
IH
Input HIGH
5.0 µAMaxV
IN
= 2.7V (OE, T/R)
Current
I
BVI
Input HIGH Current
7.0 µAMaxV
IN
= 7.0V (OE, T/R)
Breakdown Test
I
BVIT
Input HIGH Current
0.5 mA Max V
IN
= 5.5V (A
n
, B
n
)
Breakdown (I/O)
I
CEX
Output HIGH
50 µAMaxV
OUT
= V
CC
Leakage Current
V
ID
Input Leakage
4.75 V 0.0
I
ID
= 1.9 µA
Test All Other Pins Grounded
I
OD
Output Leakage
3.75 µA0.0
V
IOD
= 150 mV
Circuit Current All Other Pins Grounded
I
IL
Input LOW Current 1.2 mA Max
V
IN
= 0.5V (OE, T/R)
I
IH
+ I
OZH
Output Leakage Current 70 µAMaxV
OUT
= 2.7V (A
n
, B
n
)
I
IL
+ I
OZL
Output Leakage Current 650 µAMaxV
OUT
= 0.5V (A
n
, B
n
)
I
OS
Output Short-Circuit Current 60 150
mA Max
V
OUT
= 0V (A
n
)
100 225 V
OUT
= 0V (B
n
)
I
ZZ
Bus Drainage Test 500 µA0.0VV
OUT
= 5.25V
I
CCH
Power Supply Current 70 90 mA Max V
O
= HIGH
I
CCL
Power Supply Current 95 120 mA Max V
O
= LOW
I
CCZ
Power Supply Current 85 110 mA Max V
O
= HIGH Z

74F545SC

Mfr. #:
Manufacturer:
ON Semiconductor / Fairchild
Description:
Bus Transceivers Octal Bidir Trans
Lifecycle:
New from this manufacturer.
Delivery:
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Payment:
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