74LCXH2245 Low Voltage Bidirectional Transceiver with Bushold and 26: Series Resistors in B Outputs
October 2000
Revised March 2005
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
2.3V–3.6V 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
P
A I
CC
max
3.0V)
s
Power down high impedance outputs
s
r
12 mA output drive B Port (V
CC
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:
Order Number
74LCXH2245WM
74LCXH2245SJ
74LCXH2245MSA
74LCXH2245MTC
Package Number
M20B
M20D
MSA20
MTC20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Pb-Free 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
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Pb-Free package per JEDEC J-STD-020B.
Logic Symbol
Connection Diagram
Pin Descriptions
Pin Names
OE
T/R
A
0
–A
7
B
0
–B
7
Description
Output Enable Input
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs (Bushold)
Side B Inputs or 3-STATE Outputs (Bushold)
GTO
¥
is a trademark of Fairchild Semiconductor Corporation.
© 2005 Fairchild Semiconductor Corporation
DS500409
www.fairchildsemi.com
74LCXH2245
Absolute Maximum Ratings
(Note 1)
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
STG
Parameter
Supply Voltage
T/R, OE,
I/O Ports
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Source/Sink Current
DC Supply Current per Supply Pin
DC Ground Current per Ground Pin
Storage Temperature
Value
Conditions
Units
V
V
Output in HIGH or LOW State (Note 2)
V
I
GND
V
O
GND
V
O
!
V
CC
V
mA
mA
mA
mA
mA
0.5 to
7.0
0.5 to
7.0
0.5 to V
CC
0.5
0.5 to V
CC
0.5
50
50
50
r
50
r
100
r
100
65 to
150
q
C
Recommended Operating Conditions
(Note 3)
Symbol
V
CC
V
I
V
O
I
OH
/I
OL
Supply Voltage
Input Voltage
Output Voltage
Output Current in I
OH
/I
OL
- A Outputs
HIGH or LOW State
3-STATE
V
CC
V
CC
V
CC
Output Current in I
OH
/I
OL
- B Outputs
V
CC
V
CC
V
CC
T
A
Free-Air Operating Temperature
Input Edge Rate, V
IN
0.8V
2.0V, V
CC
3.0V
3.0V
3.6V
2.7V - 3.0V
2.3V - 2.7V
3.0V
3.6V
2.7V - 3.0V
2.3V - 2.7V
Parameter
Operating
Data Retention
Min
2.0
1.5
0
0
0
Max
3.6
3.6
V
CC
V
CC
5.5
Units
V
V
V
r
24
r
12
r
8
r
12
r
8
r
4
40
0
85
10
mA
mA
q
C
ns/V
'
t/
'
V
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
V
IH
V
IL
V
OH
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
A Outputs
I
OH
I
OH
I
OH
I
OH
I
OH
V
OH
HIGH Level Output Voltage
B Outputs
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
Conditions
V
CC
(V)
2.3
2.7
2.7
3.6
2.3
2.7
2.7 - 3.6
T
A
Min
1.7
2.0
0.7
0.8
V
CC
0.2
1.8
2.2
2.4
2.2
V
CC
0.2
1.8
2.2
2.4
2.0
2.0
V
V
40
q
C to
85
q
C
Max
Units
V
V
100
P
A
8 mA
12 mA
16 mA
24 mA
100
P
A
4 mA
4 mA
6 mA
8 mA
12 mA
2.3 - 3.6
2.3
2.7
3.0
3.0
2.3 - 3.6
2.3
2.7
3.0
2.7
3.0
3
www.fairchildsemi.com
74LCXH2245
DC Electrical Characteristics
Symbol
V
OL
Parameter
LOW Level Output Voltage
A Outputs
I
OL
I
OL
I
OL
I
OL
I
OL
V
OL
LOW Level Output Voltage
B Outputs
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
I
I
I(HOLD)
Input Leakage Current
Bushold Input Minimum
Drive Hold Current
V
I
V
IN
V
IN
V
IN
V
IN
I
I(OD)
Bushold Input Over-Drive
Current to Change State
(Continued)
V
CC
(V)
100
P
A
8 mA
12 mA
16 mA
24 mA
100
P
A
4 mA
4 mA
6 mA
8 mA
12 mA
2.3
3.6
2.3
2.7
3.0
3.0
2.3
3.6
2.3
2.7
3.0
2.7
3.0
2.3
3.6
2.3
3.0
2.7
3.6
2.3
3.6
2.3
3.6
2.3
3.6
2.3 - 3.6
45
T
A
Min
Conditions
40
q
C to
85
q
C
Max
0.2
0.6
0.4
0.4
0.55
0.2
0.6
0.4
0.55
0.6
0.8
Units
V
V
V
CC
or GND
0.7V
1.7V
0.8V
2.0V
r
5.0
45
75
P
A
P
A
75
300
(Note 5)
(Note 6)
(Note 5)
(Note 6)
300
450
P
A
450
r
5.0
10
I
OZ
I
CC
3-STATE I/O Leakage
Quiescent Supply Current
Increase in I
CC
per Input
V
O
V
I
V
I
V
IH
V
CC
or GND
V
IH
or V
IL
V
CC
or GND
V
CC
0.6V
P
A
P
A
P
A
3.6V
d
V
I
, V
O
d
5.5V (Note 4)
r
10
500
'
I
CC
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
T
A
Symbol
Parameter
V
CC
C
L
Min
t
PHL
t
PLH
t
PHL
t
PLH
t
PZL
t
PZH
t
PZL
t
PZH
t
PLZ
t
PHZ
t
PLZ
t
PHZ
t
OSHL
t
OSLH
Propagation Delay
A to B
Propagation Delay
B to A
Output Enable Time
A to B
Output Enable Time
B to A
Output Disable Time
A to B
Output Disable Time
B to A
Output to Output Skew
(Note 7)
1.5
1.5
1.5
1.5
1.5
1.5
3.3V
r
0.3V
50 pF
Max
8.0
7.0
9.5
8.5
7.5
7.5
1.0
40
q
C to
85
q
C, R
L
V
CC
C
L
Min
1.5
1.5
1.5
1.5
1.5
1.5
2.7V
50 pF
Max
9.0
8.0
10.5
9.5
8.5
8.5
500
:
V
CC
C
L
Min
1.5
1.5
1.5
1.5
1.5
1.5
2.5V
r
0.2V
30 pF
Max
9.6
8.4
11.0
10.5
9.0
9.0
ns
ns
ns
ns
ns
ns
ns
Units
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
).
www.fairchildsemi.com
4
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
