FAIRCHILD 74FR245SC

Revised August 1999
74FR245
Octal Bidirectional Transceiver with 3-STATE Outputs
General Description
Features
The 74FR245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus-oriented applications. Current sinking capability is 64 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.
■ Non-inverting buffers
■ Bidirectional data path
■ A and B output sink capability of 64 mA, source
capability of 15 mA
■ Guaranteed pin-to-pin skew
Ordering Code:
Order Number
Package Number
Package Description
74FR245SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74FR245SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74FR245PC
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Connection Diagram
Pin Descriptions
Truth Table
Pin Names
Inputs
Description
Output
OE
T/R
OE
Output Enable Input (Active-LOW)
T/R
Transmit/Receive Input
L
L
A0–A7
Side A Inputs or 3-STATE Outputs
L
H
Bus A Data to Bus B
Side B Inputs or 3-STATE Outputs
H
X
High Z State
B0–B7
© 1999 Fairchild Semiconductor Corporation
Bus B Data to Bus A
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
DS010887
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74FR245 Octal Bidirectional Transceiver with 3-STATE Outputs
August 1990
74FR245
Logic Diagram
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2
Recommended Operating
Conditions
Storage Temperature
−65°C to +150°C
Ambient Temperature under Bias
−55°C to +125°C
Free Air Ambient Temperature
Junction Temperature under Bias
−55°C to +150°C
Supply Voltage
0°C to +70°C
+4.5V to +5.5V
−0.5V to +7.0V
VCC Pin Potential to Ground Pin
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 VCC = 0V)
Standard Output
−0.5V to VCC
3-STATE Output
−0.5V 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.
Current Applied to Output
in LOW State (Max)
Note 2: Either voltage limit or current limit is sufficient to protect inputs.
twice the rated IOL (mA)
ESD Last Passing Voltage (Min)
4000V
DC Electrical Characteristics
Symbol
Parameter
Min
Typ
Max
2.0
Units
VCC
V
Conditions
VIH
Input HIGH Voltage
VIL
Input LOW Voltage
0.8
V
VCD
Input Clamp Diode Voltage
−1.2
V
Min
IIN = −18 mA
VOH
Output HIGH Voltage
V
Min
IOH = −3 mA (An, Bn)
V
Min
IOH = −15 mA (An, Bn)
VOL
Output LOW Voltage
0.55
V
Min
IOL = 64 mA (An, Bn)
5
µA
Max
VIN = 2.7V (OE, T/R)
7
µA
Max
VIN = 7.0V (OE, T/R)
100
µA
Max
VIN = 5.5V (An, B n)
−250
µA
Max
VIN = 0.5V (OE, T/R)
V
0.0
2.4
2.0
IIH
Input HIGH Current
IBVI
Input HIGH Current
IBVIT
Input HIGH Current
Breakdown Test
Breakdown Test (I/O)
IIL
Input LOW Current
VID
Input Leakage Test
4.75
Recognized HIGH Signal
Recognized LOW Signal
IID = 1.9 µA
All Other Pins Grounded
IOD
Output Circuit
Leakage Current
VIOD = 150 mV
3.75
µA
0.0
25
µA
Max
VOUT = 2.7V (An, Bn)
−150
µA
Max
VOUT = 0.5V (An, Bn)
−225
mA
Max
VOUT = 0.0V (An, Bn)
50
µA
Max
VOUT = VCC (An, Bn)
All Other Pins Grounded
IIH + IOZH
Output Leakage Current
IIL + IOZL
Output Leakage Current
IOS
Output Short-Circuit Current
ICEX
Output HIGH Leakage Current
IZZ
Bus Drainage Test
100
µA
0.0
VOUT = 5.25V (An, Bn)
ICCH
Power Supply Current
55
75
mA
Max
All Outputs HIGH
ICCL
Power Supply Current
75
110
mA
Max
All Outputs LOW
ICCZ
Power Supply Current
55
75
mA
Max
Outputs 3-STATE
CIN
Input Capacitance
−100
8.0
pF
5.0
OE, T/R
17.0
pF
5.0
An, Bn
3
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74FR245
Absolute Maximum Ratings(Note 1)
74FR245
AC Electrical Characteristics
Symbol
Parameter
TA = +25°C
TA = 0°C to +70°C
VCC = +5.0V
VCC = +5.0V
CL = 50 pF
CL = 50 pF
Min
Typ
Max
Min
Max
tPLH
Propagation Delay
1.0
2.6
3.9
1.0
3.9
tPHL
An to Bn or Bn to An
1.0
1.7
3.9
1.0
3.9
tPZH
Output Enable Time
tPZL
tPHZ
Output Disable Time
tPLZ
2.5
5.0
7.0
2.5
7.0
2.5
4.3
7.0
2.5
7.0
1.7
3.7
6.5
1.7
6.5
1.7
3.6
6.5
1.7
6.5
Units
ns
ns
ns
Extended AC Characteristics
Symbol
Parameter
TA = 0°C to +70°C
TA = 0°C to +70°C
VCC = +5.0V
VCC = +5.0V
CL = 50 pF
CL = 250 pF
Eight Outputs Switching
(Note 4)
Units
(Note 3)
Min
Max
Min
Max
tPLH
Propagation Delay
1.0
5.9
2.5
7.5
tPHL
An to Bn or Bn to An
1.0
5.9
2.5
7.5
tPZH
Output Enable Time
2.5
11.9
2.5
11.9
tPZL
tPHZ
Output Disable Time
tPLZ
tOSHL
Pin to Pin Skew
(Note 5)
for HL Transitions
tOSLH
Pin to Pin Skew
(Note 5)
for LH Transitions
tOST
Pin to Pin Skew
(Note 5)
for HL/LH Transitions
1.3
6.5
1.3
6.5
ns
ns
ns
1.7
ns
1.0
ns
3.3
ns
Note 3: This specification is guaranteed but not tested. The limits apply to propagation delays for all paths described switching in phase, i.e., all LOW-toHIGH, HIGH-to-LOW, 3-STATE-to-HIGH, etc.
Note 4: These specifications guaranteed but not tested. The limits represent propagation delays with 250 pF load capacitors in place of the 50 pF load
capacitors in the standard AC load. This specification pertains to single output switching only.
Note 5: Skew is defined as the absolute value of the difference between the actual propagation delays for any two outputs of the same device. The specification applies to any outputs switching HIGH-to-LOW (tOSHL), LOW-to-HIGH (tOSLH), or HIGH-to-LOW and/or LOW-to-HIGH (tOST). Specifications guaranteed with all outputs switching in phase.
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74FR245
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M20B
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
5
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74FR245 Octal Bidirectional Transceiver with 3-STATE Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N20A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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FAIRCHILD’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 FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
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 failure of the life support
device or system, or to affect its safety or effectiveness.
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the
user.
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