1999 Fairchild Semiconductor Corporation
DS010614
www.fairchildsemi.com
October 1989
Revised August 1999
7
4FR16245 16-Bi
t T
r
ans
ceiver
wi
th 3-ST
A
T
E
Out
puts
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:
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
Order Number
Package Number
Package Description
74FR16245QC
V44A
44-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.650 Square
74FR16245SSC
MS48A
48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
www.fairchildsemi.com
2
74FR16245
Pin Descriptions
Truth Table
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Logic Diagram
Pin Names
Description
OE
n
Output Enable Input
T/R
n
Transmit/Receive Input
A
0
A
15
A Bus Inputs/3-STATE Outputs
B
0
B
15
B Bus Inputs/3-STATE Outputs
Inputs
Output Operating Mode
Byte1 (0:7)
Byte2 (8:15)
OE
1
T/R
1
OE
2
T/R
2
Byte1 (0:7)
Byte2 (8:15)
L
L
H
X
Bus B Data to A
High Z State
L
H
H
X
Bus A Data to B
High Z State
H
X
L
L
High Z State
Bus B Data to A
H
X
L
H
High Z State
Bus A Data to B
L
L
L
L
Bus B Data to A
Bus B Data to A
L
H
L
H
Bus A Data to B
Bus A Data to B
H
X
H
X
High Z State
High Z State
3
www.fairchildsemi.com
7
4FR16245
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
+
150
C
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
-
1.2
V
Min
I
IN
=
-
18 mA
Diode Voltage
V
OH
Output HIGH
2.4
2.8
I
OH
=
-
3 mA
Voltage
2.0
2.44
V
Min
I
OH
=
-
15 mA
(A
n
, B
n
)
V
OL
Output LOW
0.45
0.55
V
Min
I
OL
=
64 mA
Voltage
(A
n
, B
n
)
I
IH
Input HIGH Current
5.0
A
Max
V
IN
=
2.7V
I
BVI
Input HIGH Current
7.0
A
Max
V
IN
=
7.0V
Break-Down Test
(OE
n
, T/R
n
)
I
BVIT
Input HIGH Current
0.1
mA
Max
V
IN
=
5.5V
Breakdown Test (I/O)
(A
n
, B
n
)
I
IL
Input LOW
-
150
A
Max
V
IN
=
0.5V (T/R
n
, A
n
, B
n
)
Current
-
100
A
Max
V
IN
=
0.5V (OE
n
)
I
OS
Output Short-Circuit
-
100
-
225
mA
Max
V
OUT
=
0V
Current
(A
n
, B
n
)
I
IH
+
Output Leakage
0
25
A
Max
V
OUT
=
2.7V
I
OZH
Current
(A
n
, B
n
)
I
IL
+
Output Leakage
-
20
-
150
A
Max
V
OUT
=
0.5V
I
OZL
Current
(A
n
, B
n
)
I
CEX
Output HIGH Leakage
50
A
Max
V
OUT
=
V
CC
Current
(A
n
, B
n
)
V
ID
Input Leakage
4.75
V
0.0
I
ID
=
1.9
A
Test
All Other Pins Grounded
I
OD
Output Circuit
3.75
A
0.0
V
IOD
=
150 mV
Leakage Current
All Other Pins Grounded
I
ZZ
Bus Drainage
100
A
0.0
V
OUT
=
5.25V
Test
(A
n
, B
n
)
I
CCH
Power Supply Current
70
105
mA
Max
V
O
=
HIGH
I
CCL
Power Supply Current
127
165
mA
Max
V
O
=
LOW
I
CCZ
Power Supply Current
71
105
mA
Max
V
O
=
HIGH Z
C
IN
Input Capacitance
8.0
pF
5.0
OE, T/R
17.0
pF
5.0
A
n
, B
n
www.fairchildsemi.com
4
74FR16245
AC Electrical Characteristics
Extended AC Characteristics
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.
Symbol
Parameter
T
A
=
+
25
C
T
A
=
0
C to
+
70
C
Unit
V
CC
=
+
5.0V
V
CC
=
+
5.0V
C
L
=
50 pF
C
L
=
50 pF
Min
Typ
Max
Min
Max
t
PLH
Propagation Delay
1.3
2.7
4.3
1.3
4.3
ns
t
PHL
A
n
to B
n
or B
n
to A
n
1.3
2.2
4.3
1.3
4.3
t
PZH
Output Enable Time
3.9
6.9
13.9
3.9
13.9
ns
t
PZL
3.9
9.7
13.9
3.9
13.9
t
PHZ
Output Disable Time
1.8
3.9
6.3
1.8
6.3
ns
t
PLZ
1.8
4.4
6.3
1.8
6.3
Symbol
Parameter
T
A
=
0
C to
+
70
C
T
A
=
0
C to
+
70
C
Unit
V
CC
=
+
5.0V
V
CC
=
+
5.0V
C
L
=
50 pF
C
L
=
250 pF
16 Outputs Switching
(Note 4)
(Note 5)
Min
Max
Min
Max
t
PLH
Propagation Delay
1.3
5.8
3.2
8.2
ns
t
PHL
A
n
to B
n
or B
n
to A
n
1.3
5.8
3.2
8.2
t
PZH
Output Enable Time
3.9
14.6
ns
t
PZL
3.9
14.6
t
PHZ
Output Disable Time
1.8
6.3
ns
t
PLZ
1.8
6.3
t
OSHL
Pin-to-Pin Skew
1.2
ns
(Note 3)
for HL Transitions
t
OSLH
Pin-to-Pin Skew
2.2
ns
(Note 3)
for LH Transitions
t
OST
Pin-to-Pin Skew
2.5
ns
(Note 3)
for HL/LH Transitions
5
www.fairchildsemi.com
7
4FR16245
Physical Dimensions
inches (millimeters) unless otherwise noted
44-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.650 Square
Package Number V44A
PDF 
ZIP