2001 Fairchild Semiconductor Corporation
DS500409
www.fairchildsemi.com
October 2000
Revised September 2001
7
4
LCXH
2
245 Low
V
o
lt
age Bi
dir
ect
ional
T
r
anscei
ver
wit
h
Bush
old
and 2
6
Seri
es R
e
sist
ors in
B O
u
t
puts
74LCXH2245
Low Voltage Bidirectional Transceiver with Bushold
and 26
Series Resistors in B Outputs
General Description
The LCXH2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus ori-
ented applications. The device is designed for low voltage
(2.5V and 3.3V) V
CC
applications. The T/R input deter-
mines the direction of data flow through the device. The OE
input disables both the A and B ports by placing them in a
high impedance state. The 26
series resistor in the B Port
output helps reduce output overshoot and undershoot.
The LCXH2245 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing CMOS low power dissipation.
The LCXH2245 data inputs include active bushold circuitry,
eliminating the need for external pull-up resistors to hold
unused or floating data inputs at a valid logic level.
Features
s
5V tolerant control inputs
s
2.3V3.6V V
CC
specifications provided
s
Bushold on inputs eliminates the need for external
pull-up/pull-down resistors
s
7.0 ns t
PD
max (V
CC
=
3.3V), 10
A I
CC
max
s
Power down high impedance outputs
s
12 mA output drive B Port (V
CC
=
3.0V)
s
Implements patented noise/EMI reduction circuitry
s
Latch-up performance exceeds 500 mA
s
Equivalent 26
series resistor on B Port outputs
s
ESD performance:
Human body model
>
2000V
Machine model
>
200V
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Logic Symbol
Pin Descriptions
Connection Diagram
GTO
is a trademark of Fairchild Semiconductor Corporation.
Order Number
Package Number
Package Description
74LCXH2245WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74LCXH2245SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LCXH2245MSA
MSA20
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74LCXH2245MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pin Names
Description
OE
Output Enable Input
T/R
Transmit/Receive Input
A
0
A
7
Side A Inputs or 3-STATE Outputs (Bushold)
B
0
B
7
Side B Inputs or 3-STATE Outputs (Bushold)
3
www.fairchildsemi.com
74
L
C
X
H
22
4
5
Absolute Maximum Ratings
(Note 1)
Recommended Operating Conditions
(Note 3)
Note 1: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated
at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The "Recom-
mended Operating Conditions" table will define the conditions for actual device operation.
Note 2: I
O
Absolute Maximum Rating must be observed.
Note 3: Floating or unused control inputs must be HIGH or LOW.
DC Electrical Characteristics
Symbol
Parameter
Value
Conditions
Units
V
CC
Supply Voltage
-
0.5 to
+
7.0
V
V
I
T/R, OE,
-
0.5 to
+
7.0
V
I/O Ports
-
0.5 to V
CC
+
0.5
V
O
DC Output Voltage
-
0.5 to V
CC
+
0.5
Output in HIGH or LOW State (Note 2)
V
I
IK
DC Input Diode Current
-
50
V
I
<
GND
mA
I
OK
DC Output Diode Current
-
50
V
O
<
GND
mA
+
50
V
O
>
V
CC
I
O
DC Output Source/Sink Current
50
mA
I
CC
DC Supply Current per Supply Pin
100
mA
I
GND
DC Ground Current per Ground Pin
100
mA
T
STG
Storage Temperature
-
65 to
+
150
C
Symbol
Parameter
Min
Max
Units
V
CC
Supply Voltage
Operating
2.0
3.6
V
Data Retention
1.5
3.6
V
I
Input Voltage
0
V
CC
V
V
O
Output Voltage
HIGH or LOW State
0
V
CC
V
3-STATE
0
5.5
I
OH
/I
OL
Output Current in I
OH
/I
OL
- A Outputs
V
CC
=
3.0V
-
3.6V
24
mA
V
CC
=
2.7V - 3.0V
12
V
CC
=
2.3V - 2.7V
8
Output Current in I
OH
/I
OL
- B Outputs
V
CC
=
3.0V
-
3.6V
12
mA
V
CC
=
2.7V - 3.0V
8
V
CC
=
2.3V - 2.7V
4
T
A
Free-Air Operating Temperature
-
40
85
C
t/
V
Input Edge Rate, V
IN
=
0.8V
-
2.0V, V
CC
=
3.0V
0
10
ns/V
Symbol
Parameter
Conditions
V
CC
T
A
=
-
40
C to
+
85
C
Units
(V)
Min
Max
V
IH
HIGH Level Input Voltage
2.3
-
2.7
1.7
V
2.7
-
3.6
2.0
V
IL
LOW Level Input Voltage
2.3
-
2.7
0.7
V
2.7 - 3.6
0.8
V
OH
HIGH Level Output Voltage
I
OH
=
-
100
A
2.3 - 3.6
V
CC
-
0.2
V
A Outputs
I
OH
=
-
8 mA
2.3
1.8
I
OH
=
-
12 mA
2.7
2.2
I
OH
=
-
16 mA
3.0
2.4
I
OH
=
-
24 mA
3.0
2.2
V
OH
HIGH Level Output Voltage
I
OH
=
-
100
A
2.3 - 3.6
V
CC
-
0.2
V
B Outputs
I
OH
=
-
4 mA
2.3
1.8
I
OH
=
-
4 mA
2.7
2.2
I
OH
=
-
6 mA
3.0
2.4
I
OH
=
-
8 mA
2.7
2.0
I
OH
=
-
12 mA
3.0
2.0
www.fairchildsemi.com
4
74LCXH2245
DC Electrical Characteristics
(Continued)
Note 4: Outputs disabled or 3-STATE only.
Note 5: An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 6: An external driver must sink at least the specified current to switch from HIGH-to-LOW.
AC Electrical Characteristics
Note 7: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (t
OSHL
) or LOW-to-HIGH (t
OSLH
).
Symbol
Parameter
Conditions
V
CC
T
A
=
-
40
C to
+
85
C
Units
(V)
Min
Max
V
OL
LOW Level Output Voltage
I
OL
=
100
A
2.3
-
3.6
0.2
V
A Outputs
I
OL
=
8 mA
2.3
0.6
I
OL
=
12 mA
2.7
0.4
I
OL
=
16 mA
3.0
0.4
I
OL
=
24 mA
3.0
0.55
V
OL
LOW Level Output Voltage
I
OL
=
100
A
2.3
-
3.6
0.2
V
B Outputs
I
OL
=
4 mA
2.3
0.6
I
OL
=
4 mA
2.7
0.4
I
OL
=
6 mA
3.0
0.55
I
OL
=
8 mA
2.7
0.6
I
OL
=
12 mA
3.0
0.8
I
I
Input Leakage Current
V
I
=
V
CC
or GND
2.3
-
3.6
5.0
A
I
I(HOLD)
Bushold Input Minimum
V
IN
=
0.7V
2.3
45
A
Drive Hold Current
V
IN
=
1.7V
-
45
V
IN
=
0.8V
3.0
75
V
IN
=
2.0V
-
75
I
I(OD)
Bushold Input Over-Drive
(Note 5)
2.7
300
A
Current to Change State
(Note 6)
-
300
(Note 5)
3.6
450
(Note 6)
-
450
I
OZ
3-STATE I/O Leakage
V
O
=
V
CC
or GND
2.3
-
3.6
5.0
A
V
I
=
V
IH
or V
IL
I
CC
Quiescent Supply Current
V
I
=
V
CC
or GND
2.3
-
3.6
10
A
3.6V
V
I
, V
O
5.5V (Note 4)
2.3
-
3.6
10
I
CC
Increase in I
CC
per Input
V
IH
=
V
CC
-
0.6V
2.3 - 3.6
500
A
Symbol
Parameter
T
A
=
-
40
C to
+
85
C, R
L
=
500
Units
V
CC
=
3.3V
0.3V
V
CC
=
2.7V
V
CC
=
2.5V
0.2V
C
L
=
50 pF
C
L
=
50 pF
C
L
=
30 pF
Min
Max
Min
Max
Min
Max
t
PHL
Propagation Delay
1.5
8.0
1.5
9.0
1.5
9.6
ns
t
PLH
A to B
t
PHL
Propagation Delay
1.5
7.0
1.5
8.0
1.5
8.4
ns
t
PLH
B to A
t
PZL
Output Enable Time
1.5
9.5
1.5
10.5
1.5
11.0
ns
t
PZH
A to B
t
PZL
Output Enable Time
1.5
8.5
1.5
9.5
1.5
10.5
ns
t
PZH
B to A
t
PLZ
Output Disable Time
1.5
7.5
1.5
8.5
1.5
9.0
ns
t
PHZ
A to B
t
PLZ
Output Disable Time
1.5
7.5
1.5
8.5
1.5
9.0
ns
t
PHZ
B to A
t
OSHL
Output to Output Skew
1.0
ns
t
OSLH
(Note 7)
5
www.fairchildsemi.com
74
L
C
X
H
22
4
5
Dynamic Switching Characteristics
Capacitance
Symbol
Parameter
Conditions
V
CC
(V)
T
A
=
25
C
Units
Typical
V
OLP
Quiet Output Dynamic Peak V
OL
C
L
=
30 pF, V
IH
=
2.5V, V
IL
=
0V
2.5
0.6
V
B to A
C
L
=
50 pF, V
IH
=
3.3V, V
IL
=
0V
3.3
0.8
Quiet Output Dynamic Peak V
OL
C
L
=
30 pF, V
IH
=
2.5V, V
IL
=
0V
2.5
0.4
V
A to B
C
L
=
50 pF, V
IH
=
3.3V, V
IL
=
0V
3.3
0.5
V
OLV
Quiet Output Dynamic Valley V
OL
C
L
=
30 pF, V
IH
=
2.5V, V
IL
=
0V
2.5
-
0.6
V
B to A
C
L
=
50 pF, V
IH
=
3.3V, V
IL
=
0V
3.3
-
0.8
Quiet Output Dynamic Valley V
OL
C
L
=
30 pF, V
IH
=
2.5V, V
IL
=
0V
2.5
-
0.4
V
A to B
C
L
=
50 pF, V
IH
=
3.3V, V
IL
=
0V
3.3
-
0.5
Symbol
Parameter
Conditions
Typical
Units
C
IN
Input Capacitance
V
CC
=
Open, V
I
=
0V or V
CC
7
pF
C
I/O
Input/Output Capacitance
V
CC
=
3.3V, V
I
=
0V or V
CC
8
pF
C
PD
Power Dissipation Capacitance
V
CC
=
3.3V, V
I
=
0V or V
CC
, f
=
10 MHz
25
pF
PDF 
ZIP