74ALVCH2245 Low Voltage Bidirectional Transceiver with Bushold
January 2002
Revised January 2002
74ALVCH2245
Low Voltage Bidirectional Transceiver with Bushold
and 26
Ω
Series Resistors in B Outputs
General Description
The ALVCH2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus ori-
ented applications. The T/R input determines the direction
of data flow. The OE input disables both the A and B Ports
by placing them in a high impedance state. The
ALVCH2245 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.
The 74ALVCH2245 is designed for low voltage (1.65V to
3.6V) V
CC
applications. The ALVCH2245 is also designed
with 26
Ω
series resistance in the B Port outputs. This
design reduces line noise in applications such as memory
address drivers, clock drivers, and bus transceivers trans-
mitters
The 74ALVCH2245 is fabricated with an advanced CMOS
technology to achieve high-speed operation while main-
taining low CMOS power dissipation.
Features
s
1.65V to 3.6V V
CC
supply operation
s
3.6V tolerant control inputs
s
Bushold on data inputs eliminates the need for external
pull-up/pull-down resistors
s
26
Ω
series resistors in B Port outputs
s
t
PD
(A to B)
4.9 ns max for 3.0V to 3.6V V
CC
6.1 ns max for 2.3V to 2.7V V
CC
9.8 ns max for 1.65V to 1.95V V
CC
s
Uses patented Quiet Series
noise/EMI reduction
circuitry
s
Latchup conforms to JEDEC JED78
s
ESD performance:
Human body model
>
2000V
Machine model
>
200V
Ordering Code:
Order Number
74ALVCH2245WM
74ALVCH2245MTC
Package Number
M20B
MTC20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" 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.
Logic Symbol
Connection Diagram
Quiet Series is a trademark of Fairchild Semiconductor Corporation.
© 2002 Fairchild Semiconductor Corporation
ds500716
www.fairchildsemi.com
74ALVCH2245
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Input Voltage (V
I
)
Output Voltage (V
O
) (Note 2)
DC Input Diode Current (I
IK
)
V
I
<
0V
DC Output Diode Current (I
OK
)
V
O
<
0V
DC Output Source/Sink Current
(I
OH
/I
OL
)
DC V
CC
or GND Current per
Supply Pin (I
CC
or GND)
Storage Temperature Range (T
STG
)
−
0.5V to
+
4.6V
−
0.5V to 4.6V
−
0.5V to V
CC
+
0.5V
−
50 mA
−
50 mA
±
50 mA
±
100 mA
−
65
°
C to
+
150
°
C
Recommended Operating
Conditions
(Note 3)
Power Supply
Operating
Input Voltage
Output Voltage (V
O
)
Free Air Operating Temperature (T
A
)
Minimum Input Edge Rate (
∆
t/
∆
V)
V
IN
=
0.8V to 2.0V, V
CC
=
3.0V
10 ns/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 Rat-
ings. The “Recommended Operating Conditions” table will define the condi-
tions for actual device operation.
Note 2:
I
O
Absolute Maximum Rating must be observed.
Note 3:
Floating or unused control inputs must be held HIGH or LOW.
1.65V to 3.6V
0V to V
CC
0V to V
CC
−
40
°
C to
+
85
°
C
DC Electrical Characteristics
Symbol
V
IH
Parameter
HIGH Level Input Voltage
Conditions
V
CC
(V)
1.65 - 1.95
2.3 - 2.7
2.7 - 3.6
V
IL
LOW Level Input Voltage
1.65 - 1.95
2.3 - 2.7
2.7 - 3.6
V
OH
HIGH Level Output Voltage
A Outputs
I
OH
= −100 µA
I
OH
= −4
mA
I
OH
= −6
mA
I
OH
= −12
mA
1.65 - 3.6
1.65
2.3
2.3
2.7
3.0
I
OH
= −24
mA
HIGH Level Output Voltage
B Outputs
I
OH
= −100 µA
I
OH
= −2
mA
I
OH
= −4
mA
I
OH
= −6
mA
I
OH
= −8
mA
I
OH
= −12
mA
V
OL
LOW Level Output Voltage
A Outputs
I
OL
=
100
µA
I
OL
=
4 mA
I
OL
=
6 mA
I
OL
=
12 mA
I
OL
=
24 mA
LOW Level Output Voltage
B Outputs
I
OL
=
100
µA
I
OL
=
2 mA
I
OL
=
4 mA
I
OL
=
6 mA
I
OL
=
8 mA
I
OL
=
12 mA
I
I
Input Leakage Current
0
≤
V
I
≤
3.6V
3.0
1.65 - 3.6
1.65
2.3
2.3
3.0
2.7
3.0
1.65 - 3.6
1.65
2.3
2.3
2.7
3.0
1.65 - 3.6
1.65
2.3
2.3
3.0
2.7
3.0
1.65 - 3.6
V
CC
- 0.2
1.2
2.0
1.7
2.2
2.4
2
V
CC
- 0.2
1.2
1.9
1.7
2.4
2
2
0.2
0.45
0.4
0.7
0.4
0.55
0.2
0.45
0.4
0.55
0.55
0.6
0.8
±5.0
µA
V
V
Min
0.65 x V
CC
1.7
2.0
0.35 x V
CC
0.7
0.8
V
V
Max
Units
3
www.fairchildsemi.com
74ALVCH2245
AC Loading and Waveforms
TABLE 1. Values for Figure 1
TEST
t
PLH
, t
PHL
t
PZL
, t
PLZ
t
PZH
, t
PHZ
SWITCH
Open
V
L
GND
FIGURE 1. AC Test Circuit
TABLE 2. Variable Matrix
(Input Characteristics: f
=
1MHz; t
r
=
t
f
=
2ns; Z
O
=
50
Ω
)
Symbol
V
mi
V
mo
V
X
V
Y
V
L
V
CC
3.3V
±
0.3V
1.5V
1.5V
V
OL
+
0.3V
V
OH
−
0.3V
6V
2.7V
1.5V
1.5V
V
OL
+
0.3V
V
OH
−
0.3V
6V
2.5
±
0.2V
V
CC
/2
V
CC
/2
V
OL
+
0.15V
V
OH
−
0.15V
V
CC
*2
1.8V
±
0.15V
V
CC
/2
V
CC
/2
V
OL
+
0.15V
V
OH
−
0.15V
V
CC
*2
FIGURE 2. Waveform for Inverting and Non-inverting Functions
FIGURE 3. 3-STATE Output High Enable and Disable Times for Low Voltage Logic
FIGURE 4. 3-STATE Output Low Enable and Disable Times for Low Voltage Logic
5
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