IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
INDUSTRIAL TEMPERATURE RANGE
CMOS OCTAL BUS
TRANSCEIVER AND 3.3V TO 5V
SHIFTER WITH 3-STATE OUT-
PUTS AND 5 VOLT TOLERANT I/O
FEATURES:
•
•
•
•
•
•
•
•
0.5 MICRON CMOS Technology
V
CCA
= 5V ± 0.5V
V
CCB
= 2.7V to 3.6V
CMOS power levels (0.4μ W typ. static)
μ
Rail-to-rail output swing for increased noise margin
All inputs, outputs, and I/O are 5V tolerant
Supports hot insertion
Available in SOIC, SSOP, QSOP, and TSSOP packages
IDT74LVC4245A
DESCRIPTION:
The LVC4245A is manufactured using advanced dual metal CMOS
technology. This octal noninverting bus transceiver contains two separate
supply rails; B port has V
CCB
, which is set at 3.3V, and A port has V
CCA
, which
is set at 5V. This allows for translation from a 3.3V to a 5V environment, and
vice-versa.
This device is ideal for asynchronous communication between two buses
(A and B). The direction control pin (DIR) controls the direction of data flow.
The output enable pin (OE) overrides the direction control and disables both
ports. All inputs are designed with hysteresis for improved noise margin.
The LVC4245A has been designed with a ±24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining
speed performance.
DRIVE FEATURES:
• High Output Drivers: ±24mA
• Reduced system switching noise
APPLICATIONS:
• 5V and 3.3V mixed voltage systems
• Data communication and telecommunication systems
FUNCTIONAL BLOCK DIAGRAM
DIR
2
22
OE
A
1
3
21
4
20
B
1
A
2
B
2
A
3
5
19
6
B
3
A
4
5V Port
B
4
A
5
7
17
8
16
B
5
A
6
B
6
A
7
9
15
10
B
7
A
8
14
B
8
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
© 2006 Integrated Device Technology, Inc.
3.3V Port
18
February 20, 2009
DSC-4754/3
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
(5V) V
CCA
DIR
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CCB
(3.3V)
V
CCB
(3.3V)
OE
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
GND
ABSOLUTE MAXIMUM RATINGS
FOR V
CCB
OR V
CCB
(1)
Symbol
V
TERM
T
STG
I
OUT
I
IK
I
OK
I
CC
I
SS
Description
Terminal Voltage with Respect to GND
Storage Temperature
DC Output Current
Continuous Clamp Current,
V
I
< 0 or V
O
< 0
Continuous Current through each
V
CC
or GND
Max
–0.5 to +6.5
–65 to +150
–50 to +50
–50
±100
Unit
V
°C
mA
mA
mA
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
CAPACITANCE
(T
A
= +25°C, F = 1.0MHz)
Symbol
C
IN
Parameter
(1)
Input Capacitance
Conditions
V
IN
= 0V or V
CCA
V
CCA
= Open
C
I/O
I/O Port Capacitance
(2)
V
OUT
= V
CCA
or GND
V
CCA
= 5V
I/O Port Capacitance
(3)
V
IN
= V
CCB
or GND
V
CCB
= 3.3V
NOTES:
1. As applicable to the device type.
2. For A port only.
3. For B port only.
Typ.
5
Max.
—
Unit
pF
11
—
pF
SOIC/ SSOP/ QSOP/ TSSOP
TOP VIEW
C
I/O
11
—
pF
PIN DESCRIPTION
Pin Names
OE
DIR
Ax
Bx
Description
Output Enable Input (Active LOW)
Direction Control Input
Port A Inputs or 3-State Outputs
Port B Inputs or 3-State Outputs
FUNCTION TABLE
(1)
Inputs
OE
L
L
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
DIR
L
H
X
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
High Z state
2
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (A PORT)
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= –40°C to +85°C, V
CCA
= 5V ± 0.5V
(1)
Symbol
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
H
I
CCL
I
CCH
I
CCZ
ΔI
CC
High Impedance Output Current
(3-State Output pins)
Input Hysteresis
Quiescent Power Supply Current
V
CCA
= 5V
V
CCA
= 5.5V
V
IN
= GND or V
CCA
—
—
100
—
—
80
mV
µA
V
CCA
= 5.5V
V
O
= 0 to 5.5V
—
—
±5
µA
Parameter
Input HIGH Voltage Level
Input LOW Voltage Level
Input Leakage Current
V
CCA
= 4.5V to 5.5V
V
CCA
= 4.5V to 5.5V
V
CCA
= 5.5V
V
I
= 0 to 5.5V
Test Conditions
Min.
2
—
—
Typ.
(2)
—
—
—
Max.
—
0.8
±1
Unit
V
V
µA
Quiescent Power Supply Current
Variation
One input at 3.4V, other inputs at V
CCA
or GND
V
CCA
= 4.5V to 5.5V
—
—
1.5
mA
NOTES:
1. V
CCB
= 2.7V to 3.6V.
2. Typical values are at V
CCA
= 5V, +25°C ambient.
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (B PORT)
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= –40°C to +85°C, V
CCB
= 2.7V to 3.6V
(1)
Symbol
V
IH
V
IL
I
OZH
I
OZL
V
H
I
CCL
I
CCH
I
CCZ
ΔI
CC
Parameter
Input HIGH Voltage Level
Input LOW Voltage Level
High Impedance Output Current
(3-State Output pins)
Input Hysteresis
Quiescent Power Supply Current
V
CCB
= 3.3V
V
CCB
= 3.6V
V
IN
= GND or V
CCB
—
—
100
—
—
50
mV
µA
V
CCB
= 2.7V to 3.6V
V
CCB
= 2.7V to 3.6V
V
CCB
= 3.6V
V
O
= 0 to V
CCB
Test Conditions
Min.
2
—
—
Typ.
(2)
—
—
—
Max.
—
0.8
±5
Unit
V
V
µA
Quiescent Power Supply Current
Variation
One input at V
CCB
- 0.6V, other inputs at V
CCB
or GND
V
CCB
= 2.7V to 3.6V
—
—
500
µA
NOTES:
1. V
CCA
= 5V ± 0.5V.
2. Typical values are at V
CCB
= 3.3V, +25°C ambient.
3
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
INDUSTRIAL TEMPERATURE RANGE
OUTPUT DRIVE CHARACTERISTICS, V
CCA
= 5V ± 0.5V (A PORT)
Symbol
V
OH
Parameter
Output HIGH Voltage
(B Port to A Port)
V
CCA
= 4.5V
V
CCA
= 5.5V
V
CCA
= 4.5V
V
CCA
= 5.5V
V
OL
Output LOW Voltage
(B Port to A Port)
V
CCA
= 4.5V
V
CCA
= 5.5V
V
CCA
= 4.5V
V
CCA
= 5.5V
I
OL
= 24mA
I
OL
= 0.1mA
I
OH
= – 24mA
Test Conditions
(1)
I
OH
= – 0.1mA
Min.
4.3
5.3
3.7
4.7
—
—
—
—
Max.
—
—
—
—
0.2
0.2
0.55
0.55
V
Unit
V
NOTE:
1. V
IH
and V
IL
must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate V
CC
range.
T
A
= – 40°C to + 85°C, V
CCB
= 2.7V to 3.6V.
OUTPUT DRIVE CHARACTERISTICS, V
CCB
= 2.7V TO 3.6V (B PORT)
Symbol
V
OH
Parameter
Output HIGH Voltage
(A Port to B Port)
V
CCB
= 2.7V
V
CCB
= 3V
V
CCB
= 3V
V
OL
Output LOW Voltage
(A Port to B Port)
V
CCB
= 2.7V to 3.6V
V
CCB
= 2.7V
V
CCB
= 3V
I
OH
= – 24mA
I
OL
= 0.1mA
I
OL
= 12mA
I
OL
= 24mA
Test Conditions
(1)
V
CCB
= 2.7V to 3.6V
I
OH
= – 0.1mA
I
OH
= – 12mA
Min.
V
CC
– 0.2
2.2
2.4
2
—
—
—
Max.
—
—
—
—
0.2
0.4
0.55
V
Unit
V
NOTE:
1. V
IH
and V
IL
must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate V
CC
range.
T
A
= – 40°C to + 85°C, V
CCA
= 5V ± 0.5V.
OPERATING CHARACTERISTICS, T
A
= 25°C
V
CCA
= 5V, V
CCB
= 3.3V
Symbol
C
PD
C
PD
Parameter
Power Dissipation Capacitance per Transceiver Outputs enabled
Power Dissipation Capacitance per Transceiver Outputs disabled
Test Conditions
C
L
= 0pF, f = 10Mhz
Typical
39.5
5
Unit
pF
4
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS
(1)
V
CCA
= 5V ± 0.5V
V
CCB
= 2.7V to 3.6V
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PZL
t
PLZ
t
PZL
t
PLZ
t
PLZ
t
PHZ
t
PLZ
t
PHZ
Parameter
Propagation Delay
Ax to Bx
Propagation Delay
Bx to Ax
Output Enable Time
OE
to Bx
Output Enable Time
OE
to Ax
Output Disable Time
OE
to Bx
Output Disable Time
OE
to Ax
Min.
1
1
1
1
1
1
1
1
1
1
1
1
Max.
6.3
6.7
6.1
5
8.8
9.8
9
8.1
7.7
7.8
7
5.8
ns
ns
ns
ns
ns
Unit
ns
NOTE:
1. See TEST CIRCUITS AND WAVEFORMS. T
A
= – 40°C to + 85°C.
5
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