74LVXC3245 — 8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs
February 2009
74LVXC3245
8-Bit Dual Supply Configurable Voltage Interface
Transceiver with 3-STATE Outputs
Features
■
Bidirectional interface between 3V and 3V-to-5V buses
■
Control inputs compatible with TTL level
■
Outputs source/sink up to 24 mA
■
Guaranteed simultaneous switching noise level and
dynamic threshold performance
■
Implements
proprietary
EMI reduction circuitry
■
Flexible V
CCB
operating range
■
Allows B Port and V
CCB
to float simultaneously when OE
is HIGH
■
Functionally compatible with the 74 series 245
General Description
The LVXC3245 is a 24-pin dual-supply, 8-bit configurable
voltage interface transceiver suited for PCMCIA and other
real time configurable I/O applications. The V
CCA
pin
accepts a 3V supply level. The A Port is a dedicated 3V
port. The V
CCB
pin accepts a 3V-to-5V supply level. The B
Port is configured to track the V
CCB
supply level respec-
tively. A 5V level on the V
CC
pin will configure the I/O pins
at a 5V level and a 3V V
CC
will configure the I/O pins at a
3V level. The A Port should interface with a 3V host system
and the B Port to the card slots. This device will allow the
V
CCB
voltage source pin and I/O pins on the B Port to float
when OE is HIGH. This feature is necessary to buffer data
to and from a PCMCIA socket that permits PCMCIA cards
to be inserted and removed during normal operation.
Ordering Code:
Order Number
74LVXC3245WM
74LVXC3245QSC
74LVXC3245MTC
Package Number
M24B
MQA24
MTC24
Package Description
224-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide
24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol/s
Connection Diagram/s
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
Side B Inputs or 3-STATE Outputs
© 1994 Fairchild Semiconductor Corporation
www.fairchildsemi.com
74LVXC3245 — 8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CCA
, V
CCB
)
DC Input Voltage (V
I
) @ OE, T/R
DC Input/Output Voltage (V
I/O
)
@ A
n
@ B
n
DC Input Diode Current (I
IK
)
@ OE, T/R
DC Output Diode (I
OK
) Current
DC Output Source or Sink Current (I
O
)
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
and Max Current
Storage Temperature Range (T
STG
)
DC Latch-Up Source or Sink Current
±50
mA
±200
mA
−65°C
to
+150°C
±300
mA
±20
mA
±50
mA
±50
mA
−0.5V
to V
CCA
+0.5V
−0.5V
to V
CCB
+0.5V
−0.5V
to
+7.0V
−0.5V
to V
CCA
+0.5V
Recommended Operating
Conditions
(Note 2)
Supply Voltage
V
CCA
V
CCB
Input Voltage (V
I
) @ OE, T/R
Input Output Voltage (V
I/O
)
@ A
n
@ B
n
Free Air Operating Temperature (T
A
)
Minimum Input Edge Rate (Δt/ΔV)
V
IN
from 30% to 70% of V
CC
V
CC
@ 3.0V, 4.5V, 5.5V
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 “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Note 2:
The A Port unused pins (inputs or I/Os) must be held HIGH or
LOW. They may not float.
2.7V to 3.6V
3.0V to 5.5V
0V to V
CCA
0V to V
CCA
0V to V
CCB
−40°C
to
+85°C
8 ns/V
DC Electrical Characteristics
Symbol
V
IHA
Parameter
Minimum HIGH
Level Input
Voltage
V
IHB
A
n
,
OE
T/R
B
n
V
CCA
(V)
2.7
3.0
3.6
2.7
3.0
3.6
V
ILA
Maximum LOW
Level Input
Voltage
V
ILB
A
n
,
OE
T/R
B
n
2.7
3.0
3.6
2.7
3.0
3.6
V
OHA
Minimum HIGH Level
Output Voltage
3.0
3.0
3.0
2.7
2.7
V
OHB
3.0
3.0
3.0
3.0
V
OLA
Maximum LOW Level
Output Voltage
3.0
3.0
2.7
2.7
V
OLB
3.0
3.0
3.0
I
IN
Maximum Input
Leakage Current @
OE, T/R
3.6
3.6
V
CCB
(V)
3.0
3.6
5.5
3.0
3.6
5.5
3.0
3.6
5.5
3.0
3.6
5.5
3.0
3.0
3.0
3.0
4.5
3.0
3.0
3.0
4.5
3.0
3.0
3.0
4.5
3.0
3.0
4.5
3.6
5.5
2.99
2.85
2.65
2.5
2.3
2.99
2.85
2.65
4.25
0.002
0.21
0.11
0.22
0.002
0.21
0.18
T
A
=
25°C
Typ
2.0
2.0
2.0
2.0
2.0
3.85
0.8
0.8
0.8
0.8
0.8
1.65
2.9
2.56
2.35
2.3
2.1
2.9
2.56
2.35
3.86
0.1
0.36
0.36
0.42
0.1
0.36
0.36
±0.1
±0.1
T
A
= −40°C
to
+85°C
Guaranteed Limits
2.0
2.0
2.0
2.0
2.0
3.85
0.8
0.8
0.8
0.8
0.8
1.65
2.9
2.46
2.25
2.2
2.0
2.9
2.46
2.25
3.76
0.1
0.44
0.44
0.5
0.1
0.44
0.44
±1.0
±1.0
μA
V
V
V
V
I
OUT
= −100 μA
I
OH
= −12
mA
I
OH
= −24
mA
I
OH
= −12
mA
I
OH
= −24
mA
I
OUT
= −100 μA
I
OH
= −12
mA
I
OH
= −24
mA
I
OH
= −24
mA
I
OUT
=
100
μA
I
OL
=
24 mA
I
OL
=
12 mA
I
OL
=
24 mA
I
OUT
=
100
μA
I
OL
=
24 mA
I
OL
=
24 mA
V
I
=
V
CCA
, GND
V
V
OUT
≤
0.1V
or
≥V
CC
−
0.1V
V
Units
Conditions
V
OUT
≤
0.1V
or
≥V
CC
−
0.1V
3
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