74F245 — Octal Bidirectional Transceiver with 3-STATE Outputs
January 2008
74F245
Octal Bidirectional Transceiver with 3-STATE Outputs
Features
■
Non-inverting buffers
■
Bidirectional data path
■
A outputs sink 24mA
■
B outputs sink 64mA
General Description
The 74F245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus-
oriented applications. Current sinking capability is
24mA at the A Ports and 64mA at the B Ports. The
Transmit/Receive (T/R) input determines the direction
of data flow through the bidirectional transceiver. Trans-
mit (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.
Ordering Information
Order
Number
74F245SC
74F245SJ
74F245MSA
74F245MTC
74F245PC
Package
Number
M20B
M20D
MSA20
MTC20
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
All packages are lead free per JEDEC: J-STD-020B standard.
©1988 Fairchild Semiconductor Corporation
74F245 Rev. 1.4.0
www.fairchildsemi.com
74F245 — Octal Bidirectional Transceiver with 3-STATE Outputs
Connection Diagram
Logic Symbols
IEEE/IEC
Truth Table
Inputs
OE
L
L
H
T/R
L
H
X
Output
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Unit Loading/Fan Out
Pin Names
OE
T/R
A
0
–A
7
B
0
–B
7
Description
Output Enable Input (Active LOW)
Transmit/Receive Input
Side A Inputs or
3-STATE Outputs
Side B Inputs or
3-STATE Outputs
U.L.
HIGH/LOW
1.0/2.0
1.0/2.0
3.5/1.083
150/40 (38.3)
3.5/1.083
600/106.6 (80)
Input I
IH
/I
IL
Output I
OH
/I
OL
20µA/–1.2mA
20µA/–1.2mA
70 µA/–0.65mA
–3 mA/24mA (20mA)
70µA/–0.65mA
–12mA/64mA (48mA)
©1988 Fairchild Semiconductor Corporation
74F245 Rev. 1.4.0
www.fairchildsemi.com
2
74F245 — Octal Bidirectional Transceiver with 3-STATE Outputs
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
T
STG
T
A
T
J
V
CC
V
I
I
I
Storage Temperature
Parameter
Ambient Temperature Under Bias
Junction Temperature Under Bias
V
CC
Pin Potential to Ground Pin
Input Voltage
(1)
Input Current
(1)
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.)
Rating
–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
–30mA to +5.0mA
–0.5V to V
CC
–0.5V to +5.5V
twice the rated I
OL
(mA)
4000V
Note:
1. Either voltage limit or current limit is sufficient to protect inputs.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
T
A
V
CC
Free Air Ambient Temperature
Supply Voltage
Parameter
Rating
0°C to +70°C
+4.5V to +5.5V
©1988 Fairchild Semiconductor Corporation
74F245 Rev. 1.4.0
www.fairchildsemi.com
3
74F245 — Octal Bidirectional Transceiver with 3-STATE Outputs
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
CD
V
OH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
10% V
CC
10% V
CC
5% V
CC
V
CC
Conditions
Recognized as a HIGH
Signal
Recognized as a LOW
Signal
Min.
2.0
Typ.
Max.
Units
V
0.8
–1.2
2.4
2.0
2.7
0.5
0.55
5.0
7.0
0.5
50
4.75
3.75
–1.2
70
–650
–60
–100
70
95
85
–150
–225
500
90
120
110
V
V
V
Min.
Min.
I
IN
=
–18mA
I
OH
=
–3mA (A
n
)
I
OH
=
–15mA (B
n
)
I
OH
=
–3mA (A
n
)
V
OL
I
IH
I
BVI
I
BVIT
I
CEX
V
ID
I
OD
I
IL
I
IL
+ I
OZL
I
OS
I
ZZ
I
CCH
I
CCL
I
CCZ
Output LOW Voltage
Input HIGH Current
10% V
CC
10% V
CC
Min.
Max.
Max.
Max.
Max.
0.0
0.0
Max.
Max.
Max.
Max.
0.0V
Max.
Max.
Max.
I
OL
=
24mA (A
n
)
I
OL
=
64mA (B
n
)
V
IN
=
2.7V
V
IN
=
7.0V (OE, T/R)
V
IN
=
5.5V (A
n
, B
n
)
V
OUT
=
V
CC
(A
n
, B
n
)
I
ID
=
1.9µA, All Other
Pins Grounded
V
IOD
=
150mV, All Other
Pins Grounded
V
IN
=
0.5V (T/R, OE)
V
OUT
=
2.7V (A
n
, B
n
)
V
OUT
=
0.5V (A
n
, B
n
)
V
OUT
=
0V (A
n
)
V
OUT
=
0V (B
n
)
V
OUT
=
5.25V(A
n
, B
n
)
V
O
=
HIGH
V
O
=
LOW
V
O
=
HIGH Z
V
µA
µA
mA
µA
V
µA
mA
µA
µA
mA
µA
mA
mA
mA
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
Output Leakage Current
Output Short-Circuit Current
Bus Drainage Test
Power Supply Current
Power Supply Current
Power Supply Current
I
IH
+ I
OZH
Output Leakage Current
©1988 Fairchild Semiconductor Corporation
74F245 Rev. 1.4.0
www.fairchildsemi.com
4
74F245 — Octal Bidirectional Transceiver with 3-STATE Outputs
AC Electrical Characteristics
T
A
=
+25°C,
V
CC
=
+5.0V,
C
L
=
50pF
Symbol
t
PLH
, t
PHL
t
PZH
, t
PZL
t
PHZ
, t
PLZ
T
A
=
– 55°C to +125°C, T
A
=
0°C to +70°C,
C
L
=
50pF
C
L
=
50pF
Min.
2.0
2.0
2.5
3.0
2.0
2.0
Parameter
Propagation Delay,
A
n
to B
n
or B
n
to A
n
Output Enable Time
Output Disable Time
Min.
2.5
2.5
3.0
3.5
2.0
2.0
Typ.
4.2
4.2
5.3
6.0
5.0
5.0
Max.
6.0
6.0
7.0
8.0
6.5
6.5
Max.
7.5
7.5
9.0
10.0
9.0
10.0
Min.
2.0
2.0
2.5
3.0
2.0
2.0
Max.
7.0
7.0
8.0
9.0
7.5
7.5
Units
ns
ns
ns
©1988 Fairchild Semiconductor Corporation
74F245 Rev. 1.4.0
www.fairchildsemi.com
5
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