74FR9245 9-Bit Bidirectional Transceiver with 3-STATE Outputs
April 1991
Revised August 1999
74FR9245
9-Bit Bidirectional Transceiver with 3-STATE Outputs
General Description
The 74FR9245 contains nine non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus-ori-
ented 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 bidirec-
tional 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.
Features
s
Non-inverting buffers
s
Bidirectional data path
s
A and B output sink capability of 64 mA, source
capability of 15 mA
s
Guaranteed pin-to-pin skew, multiple output switching
and 250 pf delay
Ordering Code:
Order Number
74FR9245SC
74FR9245MSA
74FR9245SPC
Package Number
M24B
MSA24
N24C
Package Description
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
24-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 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
© 1999 Fairchild Semiconductor Corporation
DS010914
www.fairchildsemi.com
74FR9245
Pin Descriptions
Pin Names
OE
T/R
A
0
–A
8
B
0
–B
8
Description
Output Enable Input (Active-LOW)
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
Truth Table
Inputs
OE
L
L
H
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Output
T/R
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
Logic Diagram
www.fairchildsemi.com
2
74FR9245
Absolute Maximum Ratings
(Note 1)
Storage Temperature
Ambient Temperature under Bias
Junction Temperature under Bias
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
=
0V)
Standard Output
3-STATE Output
Current Applied to Output
in LOW State (Max)
ESD Last Passing Voltage (Min)
twice the rated I
OL
(mA)
4000V
−0.5V
to V
CC
−0.5V
to
+5.5V
−65°C
to
+150°C
−55°C
to
+125°C
−55°C
to
+150°C
−0.5V
to
+7.0V
−0.5V
to
+7.0V
−30
mA to
+5.0
mA
Recommended Operating
Conditions
Free Air Ambient Temperature
Supply Voltage
0°C to
+70°C
+4.5V
to
+5.5V
Note 1:
Absolute maximum ratings are value 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
V
IH
V
IL
V
CD
V
OH
V
OL
I
IH
I
BVI
I
BVIT
I
IL
V
ID
I
OD
I
IH
+
I
OZH
I
IL
+
I
OZL
I
OS
I
CEX
I
ZZ
I
CCH
I
CCL
I
CCZ
C
IN
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
Output LOW Voltage
Input HIGH Current
Input HIGH Current
Breakdown Test
Input HIGH Current
Breakdown Test (I/O)
Input LOW Current
Input Leakage Test
Output Circuit
Leakage Current
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Output HIGH Leakage Current
Bus Drainage Test
Power Supply Current
Power Supply Current
Power Supply Current
Input Capacitance
55
75
65
8.0
17.0
−100
4.75
2.4
2.0
0.55
5
7
100
−250
Min
2.0
0.8
−1.2
Typ
Max
Units
V
V
V
V
V
V
µA
µA
µA
µA
V
Min
Min
Min
Min
Max
Max
Max
Max
0.0
V
CC
Conditions
Recognized HIGH Signal
Recognized LOW Signal
I
IN
= −18
mA
I
OH
= −3
mA (A
n
, B
n
)
I
OH
= −15
mA (A
n
, B
n
)
I
OL
=
64 mA (A
n
, B
n
)
V
IN
=
2.7V (OE, T/R)
V
IN
=
7.0V (OE, T/R)
V
IN
=
5.5V (A
n
, B
n
)
V
IN
=
0.5V (OE, T/R)
I
ID
=
1.9
µA
All Other Pins Grounded
3.75
25
−150
−225
50
100
80
115
85
µA
µA
µA
mA
µA
µA
mA
mA
mA
pF
pF
0.0
Max
Max
Max
Max
0.0
Max
Max
Max
5.0
5.0
V
IOD
=
150 mV
All Other Pins Grounded
V
OUT
=
2.7V (A
n
, B
n
)
V
OUT
=
0.5V (A
n
, B
n
)
V
OUT
=
0.0V (A
n
, B
n
)
V
OUT
=
V
CC
(A
n
, B
n
)
V
OUT
=
5.25V (A
n
, B
n
)
All Outputs HIGH
All Outputs LOW
Outputs 3-STATE
OE, T/R
A
n
, B
n
3
www.fairchildsemi.com
74FR9245
AC Electrical Characteristics
T
A
= +25°C
Symbol
Parameter
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Output Disable Time
Propagation Delay
A
n
to B
n
or B
n
to A
n
Output Enable Time
1.0
1.0
2.7
2.7
1.7
1.7
V
CC
= +5.0V
C
L
=
50 pF
Typ
2.6
1.7
5.0
4.3
3.7
3.6
Max
3.9
3.9
6.5
6.5
6.0
6.0
T
A
=
0°C to
+70°C
V
CC
= +50V
C
L
=
50 pF
Min
1.0
1.0
2.7
2.7
1.7
1.7
Max
3.9
3.9
6.5
6.5
6.0
6.0
ns
ns
ns
Units
Extended AC Electrical Characteristics
T
A
=
0°C to
+70°C
V
CC
= +50V
Symbol
Parameter
C
L
=
50 pF
Eight Outputs Switching
(Note 3)
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
OSHL
(Note 5)
t
OSLH
(Note 5)
t
OST
(Note 5)
Pin-to-Pin Skew
for HL Transitions
Pin-to-Pin Skew
for LH Transitions
Pin-to-Pin Skew
for HL/LH Transitions
Output Disable Time
Propagation Delay
A
n
to B
n
or B
n
to A
n
Output Enable Time
1.0
1.0
2.7
2.7
1.7
1.7
Max
5.8
5.8
8.8
8.8
7.0
7.0
2.0
1.0
3.0
Min
2.2
2.2
Max
8.1
8.1
ns
ns
ns
ns
ns
ns
T
A
=
0°C to
+70°C
V
CC
= +50V
C
L
=
250 pF
(Note 4)
Units
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-to-HIGH, 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 specifi-
cation applies to any outputs switching HIGH-to-LOW (t
OSHL
), LOW-to-HIGH (t
OSLH
), or HIGH-to-LOW and/or LOW-to-HIGH (t
OST
). Specifications guaran-
teed with all outputs switching in phase.
www.fairchildsemi.com
4
74FR9245
Physical Dimensions
inches (millimeters) unless otherwise noted
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M24B
24-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
Package Number MSA24
5
www.fairchildsemi.com
微控制器 MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
