INDUSTRIAL TEMPERATURE RANGE
IDT74LVCH2245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
1
OCTOBER 1999
INDUSTRIAL TEMPERATURE RANGE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
1999 Integrated Device Technology, Inc.
DSC-4937/1
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS:
5V and 3.3V mixed voltage systems
Data communication and telecommunication systems
DRIVE FEATURES:
Balanced Output Drivers: 12mA (B Port)
High Output Drivers: 24mA (A Port)
IDT74LVCH2245A
DESCRIPTION:
This bus transceiver is built using advanced dual metal CMOS technol-
ogy. The LVCH2245A device is designed for asynchronous communica-
tion between data buses. The device transmits data from the A bus to the
B bus or from the B bus to the A bus, depending on the logic level at the
direction-control (DIR) input. The output-enable (OE) input can be used to
disable the device so the buses are effectively isolated.
Inputs can be driven from either 3.3V or 5V devices. This feature allows
the use of this device as a translator in a mixed 3.3V/5V environment.
The LVCH2245A has series resistors in the output structure of the "B"
port, which will significantly reduce line noise when used with light loads. The
driver has been designed to drive 12mA at the designated threshold
levels. The "A" port has a 24mA driver.
The LVCH2245A has "bus-hold" which retains the inputs' last state
whenever the input goes to a high-impedance. This prevents floating inputs
and eliminates the need for pull-up/down resistors.
3.3V CMOS OCTAL BUS
TRANSCEIVER WITH 3-STATE
OUTPUTS, 5 VOLT TOLERANT I/O,
AND BUS-HOLD
DIR
A
1
B
1
OE
1
2
19
18
TO SEVEN OTHER CHANNELS
FEATURES:
0.5 MICRON CMOS Technology
ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
V
CC
= 3.3V 0.3V, Normal Range
V
CC
= 2.7V to 3.6V, Extended Range
CMOS power levels (0.4
W typ. static)
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
INDUSTRIAL TEMPERATURE RANGE
2
IDT74LVCH2245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
PIN CONFIGURATION
NOTE:
1. As applicable to the device type.
Symbol
Parameter
(1)
Conditions
Typ.
Max.
Unit
C
IN
Input Capacitance
V
IN
= 0V
4.5
6
pF
C
OUT
Output Capacitance
V
OUT
= 0V
5.5
8
pF
C
I/O
I/O Port Capacitance
V
IN
= 0V
6.5
8
pF
CAPACITANCE
(T
A
= +25C, F = 1.0MHz)
Symbol
Description
Max
Unit
V
TERM
Terminal Voltage with Respect to GND
0.5 to +6.5
V
T
STG
Storage Temperature
65 to +150
C
I
OUT
DC Output Current
50 to +50
mA
I
IK
Continuous Clamp Current,
50
mA
I
OK
V
I
< 0 or V
O
< 0
I
CC
Continuous Current through each
100
mA
I
SS
V
CC
or GND
ABSOLUTE MAXIMUM RATINGS
(1)
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.
SOIC/ SSOP/ QSOP/ TSSOP
TOP VIEW
NOTE:
1. H = HIGH Voltage Level
X = Don't Care
L = LOW Voltage Level
Inputs
OE
DIR
Outputs
L
L
B Data to A Bus
L
H
A Data to B Bus
H
X
Isolation
FUNCTION TABLE
(1)
Pin Names
Description
OE
Output Enable Input (Active LOW)
DIR
Direction Control Output
A x
Side A Inputs or 3-State Outputs
(1)
B x
Side B Inputs or 3-State Outputs
(1)
PIN DESCRIPTION
NOTE:
1. These pins have "Bus-Hold". All other pins are standard inputs, outputs, or I/Os.
2
3
1
A
1
V
CC
16
15
14
B
4
B
3
B
5
B
1
B
2
11
B
7
B
6
B
8
19
18
20
17
13
12
DIR
5
6
A
6
7
A
4
A
5
4
A
2
A
3
8
9
GND
10
A
7
A
8
OE
INDUSTRIAL TEMPERATURE RANGE
IDT74LVCH2245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
3
Symbol
Parameter
Test Conditions
Min.
Typ.
(1)
Max.
Unit
V
IH
Input HIGH Voltage Level
V
CC
= 2.3V to 2.7V
1.7
--
--
V
V
CC
= 2.7V to 3.6V
2
--
--
V
IL
Input LOW Voltage Level
V
CC
= 2.3V to 2.7V
--
--
0.7
V
V
CC
= 2.7V to 3.6V
--
--
0.8
I
IH
Input Leakage Current
V
CC
= 3.6V
V
I
= 0 to 5.5V
--
--
5
A
I
IL
I
OZH
High Impedance Output Current
V
CC
= 3.6V
V
O
= 0 to 5.5V
--
--
10
A
I
OZL
(3-State Output pins)
I
OFF
Input/Output Power Off Leakage
V
CC
= 0V, V
IN
or V
O
5.5V
--
--
50
A
V
IK
Clamp Diode Voltage
V
CC
= 2.3V, I
IN
= 18mA
--
0.7
1.2
V
V
H
Input Hysteresis
V
CC
= 3.3V
--
100
--
mV
I
CCL
Quiescent Power Supply Current
V
CC
= 3.6V
V
IN
= GND or V
CC
--
--
10
A
I
CCH
I
CCZ
3.6
V
IN
5.5V
(2)
--
--
10
I
CC
Quiescent Power Supply Current
One input at V
CC
- 0.6V, other inputs at V
CC
or GND
--
--
500
A
Variation
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= 40C to +85C
NOTES:
1. Typical values are at V
CC
= 3.3V, +25C ambient.
2. This applies in the disabled state only.
BUS-HOLD CHARACTERISTICS
Symbol
Parameter
(1)
Test Conditions
Min.
Typ.
(2)
Max.
Unit
I
BHH
Bus-Hold Input Sustain Current
V
CC
= 3V
V
I
= 2V
75
--
--
A
I
BHL
V
I
= 0.8V
75
--
--
I
BHH
Bus-Hold Input Sustain Current
V
CC
= 2.3V
V
I
= 1.7V
--
--
--
A
I
BHL
V
I
= 0.7V
--
--
--
I
BHHO
Bus-Hold Input Overdrive Current
V
CC
= 3.6V
V
I
= 0 to 3.6V
--
--
500
A
I
BHLO
NOTES:
1. Pins with Bus-Hold are identified in the pin description.
2. Typical values are at V
CC
= 3.3V, +25C ambient.
INDUSTRIAL TEMPERATURE RANGE
4
IDT74LVCH2245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
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
= 40C to + 85C.
OUTPUT DRIVE CHARACTERISTICS (B PORT)
Symbol
Parameter
Test Conditions
(1)
Min.
Max.
Unit
V
OH
Output HIGH Voltage
V
CC
= 2.3V to 3.6V
I
OH
= 0.1mA
V
CC
0.2
--
V
V
CC
= 2.3V
I
OH
= 4mA
1.9
--
I
OH
= 6mA
1.7
--
V
CC
= 2.7V
I
OH
= 4mA
2.2
--
I
OH
= 8mA
2
--
V
CC
= 3V
I
OH
= 6mA
2.4
--
I
OH
= 12mA
2
--
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
I
OL
= 0.1mA
--
0.2
V
V
CC
= 2.3V
I
OL
= 4mA
--
0.4
I
OL
= 6mA
--
0.55
V
CC
= 2.7V
I
OL
= 4mA
--
0.4
I
OL
= 8mA
--
0.6
V
CC
= 3V
I
OL
= 6mA
--
0.55
I
OL
= 12mA
--
0.8
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
= 40C to + 85C.
OUTPUT DRIVE CHARACTERISTICS (A PORT)
Symbol
Parameter
Test Conditions
(1)
Min.
Max.
Unit
V
OH
Output HIGH Voltage
V
CC
= 2.3V to 3.6V
I
OH
= 0.1mA
V
CC
0.2
--
V
V
CC
= 2.3V
I
OH
= 6mA
2
--
V
CC
= 2.3V
I
OH
= 12mA
1.7
--
V
CC
= 2.7V
2.2
--
V
CC
= 3V
2.4
--
V
CC
= 3V
I
OH
= 24mA
2
--
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
I
OL
= 0.1mA
--
0.2
V
V
CC
= 2.3V
I
OL
= 6mA
--
0.4
I
OL
= 12mA
--
0.7
V
CC
= 2.7V
I
OL
= 12mA
--
0.4
V
CC
= 3V
I
OL
= 24mA
--
0.55
INDUSTRIAL TEMPERATURE RANGE
IDT74LVCH2245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
5
OPERATING CHARACTERISTICS, V
CC
= 3.3V 0.3V, T
A
= 25C
Symbol
Parameter
Test Conditions
Typical
Unit
C
PD
Power Dissipation Capacitance per Transceiver Outputs enabled
C
L
= 0pF, f = 10Mhz
48
pF
C
PD
Power Dissipation Capacitance per Transceiver Outputs disabled
4
SWITCHING CHARACTERISTICS (B PORT)
(1)
V
CC
= 2.7V
V
CC
= 3.3V 0.3V
Symbol
Parameter
Min.
Max.
Min.
Max.
Unit
t
PLH
Propagation Delay
--
8.1
1.5
7.1
ns
t
PHL
Ax to Bx
t
PZH
Output Enable Time
--
10
1.5
9
ns
t
PZL
OE to Bx
t
PHZ
Output Disable Time
--
9.2
1.7
8.2
ns
t
PLZ
OE to Bx
t
SK
(o)
Output Skew
(2)
--
--
--
500
ps
NOTES:
1. See TEST CIRCUITS AND WAVEFORMS. T
A
= 40C to + 85C.
2. Skew between any two outputs of the same package and switching in the same direction.
SWITCHING CHARACTERISTICS (A PORT)
(1)
V
CC
= 2.7V
V
CC
= 3.3V 0.3V
Symbol
Parameter
Min.
Max.
Min.
Max.
Unit
t
PLH
Propagation Delay
--
7.3
1.5
6.3
ns
t
PHL
Bx to Ax
t
PZH
Output Enable Time
--
9.5
1.5
8.5
ns
t
PZL
OE to Ax
t
PHZ
Output Disable Time
--
8.5
1.7
7.5
ns
t
PLZ
OE to Ax
t
SK
(o)
Output Skew
(2)
--
--
--
500
ps
NOTES:
1. See TEST CIRCUITS AND WAVEFORMS. T
A
= 40C to + 85C.
2. Skew between any two outputs of the same package and switching in the same direction.
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