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74LCXH245 Low Voltage Bidirectional Transceiver with Bushold
October 2000
Revised September 2001
74LCXH245
Low Voltage Bidirectional Transceiver with Bushold
General Description
The LCXH245 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 LCXH245 is fabricated with an advanced CMOS tech-
nology to achieve high speed operation while maintaining
CMOS low power dissipation. The LCXH16244 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
7.0 ns t
PD
max (V
CC
=
3.3V), 10
µ
A I
CC
max
s
Power down high impedance outputs
s
±
24 mA output drive (V
CC
=
3.0V)
s
Implements patented noise/EMI reduction circuitry
s
Latch-up performance exceeds 500 mA
s
Bushold on inputs eliminates the need for external
pull-up/pull-down resistors
s
ESD performance:
Human body model
>
2000V
Machine model
>
200V
Ordering Code:
Order Number
74LCXH245WM
74LCXH245SJ
74LCXH245MSA
74LCXH245MTC
Package Number
M20B
M20D
MSA20
MTC20
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), EIAJ TYPE II, 5.3mm Wide
Unused bus terminals during HIGH Z State must be held HIGH or LOW.
T/R
L
H
X
Bus B
0
– B
7
Data to Bus A
0
– A
7
Bus A
0
– A
7
Data to Bus B
0
– B
7
HIGH Z State on A
0
– A
7
, B
0
– B
7
(Note 1)
Logic Diagram
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2
74LCXH245
Absolute Maximum Ratings
(Note 2)
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 3-STATE
Output in HIGH or LOW State (Note 3)
V
I
<
GND
V
O
<
GND
V
O
>
V
CC
−
0.5 to
+
7.0
0.5 to
+
7.0
−
0.5 to V
CC
+
0.5
−
0.5 to
+
7.0
−
0.5 to V
CC
+
0.5
−
50
−
50
+
50
±
50
±
100
±
100
−
65 to
+
150
V
mA
mA
mA
mA
mA
°
C
Recommended Operating Conditions
(Note 4)
Symbol
V
CC
V
I
V
O
I
OH
/I
OL
Supply Voltage
Input Voltage
Output Voltage
Output Current
HIGH or LOW State
3-STATE
V
CC
=
3.0V
−
3.6V
V
CC
=
2.7V - 3.0V
V
CC
=
2.3V - 2.7V
T
A
Free-Air Operating Temperature
Input Edge Rate, V
IN
=
0.8V
−
2.0V, V
CC
=
3.0V
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
±
24
±
12
±
8
−
40
0
85
10
mA
°
C
ns/V
∆
t/
∆
V
Note 2:
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 3:
I
O
Absolute Maximum Rating must be observed.
Note 4:
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
I
OH
= −100 µA
I
OH
= −8
mA
I
OH
= −12
mA
I
OH
= −18
mA
I
OH
= −24
mA
V
OL
LOW Level Output Voltage
I
OL
=
100
µA
I
OL
=
8mA
I
OL
=
12 mA
I
OL
=
16 mA
I
OL
=
24 mA
I
I
Input Leakage Current
V
I
=
V
CC
or GND
Conditions
V
CC
(V)
2.3
−
2.7
2.7
−
3.6
2.3
−
2.7
2.7 - 3.6
2.3 - 3.6
2.3
2.7
3.0
3.0
2.3
−
3.6
2.3
2.7
3.0
3.0
2.3
−
3.6
V
CC
−
0.2
1.8
2.2
2.4
2.2
0.2
0.6
0.4
0.4
0.55
±5.0
µA
V
V
T
A
= −40°C
to
+85°C
Min
1.7
2.0
0.7
0.8
Max
Units
V
V
3
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74LCXH245
DC Electrical Characteristics
Symbol
I
I(HOLD)
Parameter
Bushold Input Minimum
Drive Hold Current
(Continued)
V
CC
(V)
T
A
= −40°C
to
+85°C
Min
45
−45
75
−75
300
−300
450
−450
±5.0
10
±10
500
µA
µA
µA
µA
µA
Max
Conditions
V
IN
=
0.7V
V
IN
=
1.7V
V
IN
=
0.8V
V
IN
=
2.0V
Units
2.3
3.0
2.7
3.6
2.3
−
3.6
2.3
−
3.6
2.3
−
3.6
2.3 - 3.6
I
I(OD)
Bushold Input Over-Drive
Current to Change State
(Note 6)
(Note 7)
(Note 6)
(Note 7)
I
OZ
I
CC
∆I
CC
3-STATE I/O Leakage
Quiescent Supply Current
Increase in I
CC
per Input
V
O
=
V
CC
or GND
V
I
=
V
CC
or GND
3.6V
≤
V
I
, V
O
≤
5.5V (Note 5)
V
IH
=
V
CC
−0.6V
Note 5:
Outputs disabled or 3-STATE only.
Note 6:
An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 7:
An external driver must sink at least the specified current to switch from HIGH-to-LOW.
AC Electrical Characteristics
T
A
= −40°C
to
+85°C,
R
L
=
500Ω
Symbol
Parameter
V
CC
=
3.3V
±
0.3V
C
L
=
50 pF
Min
t
PHL
t
PLH
t
PZL
t
PZH
t
PLZ
t
PHZ
t
OSHL
t
OSLH
Output to Output Skew
(Note 8)
Output Disable Time
Propagation Delay
A
n
to B
n
or B
n
to A
n
Output Enable Time
1.5
1.5
1.5
1.5
1.5
1.5
Max
7.0
7.0
8.5
8.5
7.5
7.5
1.0
1.0
Min
1.5
1.5
1.5
1.5
1.5
1.5
V
CC
=
2.7V
C
L
=
50 pF
Max
8.0
8.0
9.5
9.5
8.5
8.5
Min
1.5
1.5
1.5
1.5
1.5
1.5
8.4
8.4
10.5
10.5
9.0
9.0
V
CC
=
2.5V
±
0.2V
C
L
=
30 pF
Max
ns
ns
ns
ns
Units
Note 8:
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
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