74FR16245 16-Bit Transceiver with 3-STATE Outputs
October 1989
Revised August 1999
74FR16245
16-Bit Transceiver with 3-STATE Outputs
General Description
The 74FR16245 contains sixteen non-inverting bidirec-
tional 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 device is byte controlled.
Each byte has separate control inputs which can be
shorted together for full 16-bit operation. The transmit/
receive (T/R
n
) inputs determine the direction of data flow
through the transceiver. The output enable (OE
n
) inputs
disable both A and B Ports by placing them in an high
impedance state.
Features
s
Non-inverting buffers
s
Bidirectional data paths
s
A and B output sink capability of 64 mA, source
capability of 15 mA
s
Separate control pins for each byte
s
Guaranteed pin-to-pin skew
s
Low 3-STATE I
IL
s
16-Bit version of the 74F245 or 74F645
Ordering Code:
Order Number
74FR16245QC
74FR16245SSC
Package Number
V44A
MS48A
Package Description
44-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.650 Square
48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagrams
Pin Assignment for SSOP
Pin Assignment for PLCC
Logic Symbol
© 1999 Fairchild Semiconductor Corporation
DS010614
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74FR16245
Pin Descriptions
Pin Names
OE
n
T/R
n
A
0
–A
15
B
0
–B
15
Description
Output Enable Input
Transmit/Receive Input
A Bus Inputs/3-STATE Outputs
B Bus Inputs/3-STATE Outputs
Truth Table
Inputs
Byte1 (0:7)
OE
1
L
L
H
H
L
L
H
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Output Operating Mode
Byte2 (8:15)
OE
2
H
H
L
L
L
L
H
T/R
2
X
X
L
H
L
H
X
Byte1 (0:7)
Bus B Data to A
Bus A Data to B
High Z State
High Z State
Bus B Data to A
Bus A Data to B
High Z State
Byte2 (8:15)
High Z State
High Z State
Bus B Data to A
Bus A Data to B
Bus B Data to A
Bus A Data to B
High Z State
T/R
1
L
H
X
X
L
H
X
Logic Diagram
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74FR16245
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 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
Symbol
V
IH
V
IL
V
CD
V
OH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp
Diode Voltage
Output HIGH
Voltage
V
OL
I
IH
I
BVI
I
BVIT
I
IL
Output LOW
Voltage
Input HIGH Current
Input HIGH Current
Break-Down Test
Input HIGH Current
Breakdown Test (I/O)
Input LOW
Current
I
OS
I
IH
+
I
OZH
I
IL
+
I
OZL
I
CEX
V
ID
I
OD
I
ZZ
I
CCH
I
CCL
I
CCZ
C
IN
Output Short-Circuit
Current
Output Leakage
Current
Output Leakage
Current
Output HIGH Leakage
Current
Input Leakage
Test
Output Circuit
Leakage Current
Bus Drainage
Test
Power Supply Current
Power Supply Current
Power Supply Current
Input Capacitance
70
127
71
8.0
17.0
4.75
3.75
100
105
165
105
−100
0
−20
2.4
2.0
2.8
2.44
V
Min
Min
2.0
0.8
−1.2
Typ
Max
Units
V
V
V
Min
V
CC
Conditions
Recognized as a HIGH Signal
Recognized as a LOW Signal
I
IN
= −18
mA
I
OH
= −
3 mA
I
OH
= −
15 mA
(A
n
, B
n
)
0.45
0.55
5.0
7.0
0.1
−150
−100
−225
25
−150
50
V
µA
µA
mA
µA
µA
mA
µA
µA
µA
V
µA
µA
mA
mA
mA
pF
pF
Min
Max
Max
Max
Max
Max
Max
Max
Max
Max
0.0
0.0
0.0
Max
Max
Max
5.0
5.0
I
OL
=
64 mA
(A
n
, B
n
)
V
IN
=
2.7V
V
IN
=
7.0V
(OE
n
, T/R
n
)
V
IN
=
5.5V
(A
n
, B
n
)
V
IN
=
0.5V (T/R
n
, A
n
, B
n
)
V
IN
=
0.5V (OE
n
)
V
OUT
=
0V
(A
n
, B
n
)
V
OUT
=
2.7V
(A
n
, B
n
)
V
OUT
=
0.5V
(A
n
, B
n
)
V
OUT
=
V
CC
(A
n
, B
n
)
I
ID
=
1.9
µA
All Other Pins Grounded
V
IOD
=
150 mV
All Other Pins Grounded
V
OUT
=
5.25V
(A
n
, B
n
)
V
O
=
HIGH
V
O
=
LOW
V
O
=
HIGH Z
OE, T/R
A
n
, B
n
3
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74FR16245
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
1.3
1.3
3.9
3.9
1.8
1.8
V
CC
= +5.0V
C
L
=
50 pF
Typ
2.7
2.2
6.9
9.7
3.9
4.4
Max
4.3
4.3
13.9
13.9
6.3
6.3
T
A
=
0°C to
+70°C
V
CC
= +5.0V
C
L
=
50 pF
Min
1.3
1.3
3.9
3.9
1.8
1.8
Max
4.3
4.3
13.9
13.9
6.3
6.3
ns
ns
ns
Unit
Extended AC Characteristics
T
A
=
0°C to
+70°C
V
CC
= +5.0V
Symbol
Parameter
C
L
=
50 pF
16 Outputs Switching
(Note 4)
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
OSHL
(Note 3)
t
OSLH
(Note 3)
t
OST
(Note 3)
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
1.3
1.3
3.9
3.9
1.8
1.8
Max
5.8
5.8
14.6
14.6
6.3
6.3
1.2
2.2
2.5
Min
3.2
3.2
(Note 5)
Max
8.2
8.2
ns
ns
ns
ns
ns
ns
T
A
=
0°C to
+70°C
V
CC
= +5.0V
C
L
=
250 pF
Unit
Note 3:
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.
Note 4:
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 5:
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.
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74FR16245
Physical Dimensions
inches (millimeters) unless otherwise noted
44-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.650 Square
Package Number V44A
5
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