IDT74LVC245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
AND 5 VOLT TOLERANT I/O
IDT74LVC245A
FEATURES:
DESCRIPTION:
• 0.5 MICRON CMOS Technology
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• VCC = 3.3V ± 0.3V, Normal Range
• VCC = 2.7V to 3.6V, Extended Range
μ W typ. static)
• CMOS power levels (0.4μ
• 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
This octal bus transceiver is built using advanced dual metal CMOS
technology. This high-speed, low power transceiver is ideal for asynchronous communication between two busses (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 LVC245A has been designed with a ±24mA output driver. This driver
is capable of driving a moderate to heavy load while maintaining speed
performance.
All pins 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 supply system.
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
1
19
OE
A1
2
18
B1
3
A2
17
B2
A3
4
16
A4
B3
5
15
B4
A5
6
14
B5
A6
7
13
B6
A7
8
12
B7
A8
9
11
B8
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
OCTOBER 2008
1
© 2006 Integrated Device Technology, Inc.
DSC-4496/4
IDT74LVC245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS(1)
PIN CONFIGURATION
Symbol
Description
Max
VTERM
Terminal Voltage with Respect to GND
–0.5 to +6.5
V
TSTG
Storage Temperature
–65 to +150
°C
IOUT
DC Output Current
–50 to +50
mA
Continuous Clamp Current,
VI < 0 or VO < 0
–50
mA
Continuous Current through each
VCC or GND
±100
mA
DIR
1
20
A1
2
19
OE
IIK
IOK
A2
3
18
B1
ICC
ISS
A3
4
17
B2
A4
5
16
B3
A5
6
15
B4
A6
7
14
B5
A7
8
13
B6
A8
9
12
B7
VCC
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 (TA = +25°C, F = 1.0MHz)
Parameter(1)
Symbol
GND
10
11
Unit
B8
Conditions
Typ.
Input Capacitance
VIN = 0V
4.5
6
pF
COUT
Output Capacitance
VOUT = 0V
5.5
8
pF
CI/O
I/O Port Capacitance
VIN = 0V
6.5
8
pF
PIN DESCRIPTION
Pin Names
Description
OE
Output Enable Input (Active LOW)
DIR
Direction Control Input
Ax
Side A Inputs or 3-State Outputs
Bx
Side B Inputs or 3-State Outputs
FUNCTION TABLE(1)
Inputs
OE
DIR
Outputs
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
Z
NOTES:
1. H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level
Z = High-Impedance
2
Unit
CIN
NOTE:
1. As applicable to the device type.
SOIC/ SSOP/ QSOP/ TSSOP
TOP VIEW
Max.
IDT74LVC245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: TA = –40°C to +85°C
Symbol
VIH
VIL
Min.
Typ.(1)
Max.
Unit
VCC = 2.3V to 2.7V
1.7
—
—
V
VCC = 2.7V to 3.6V
2
—
—
VCC = 2.3V to 2.7V
—
—
0.7
VCC = 2.7V to 3.6V
—
—
0.8
Parameter
Input HIGH Voltage Level
Input LOW Voltage Level
Test Conditions
V
Input Leakage Current
VCC = 3.6V
VI = 0 to 5.5V
—
—
±5
µA
IOZH
High Impedance Output Current
VCC = 3.6V
VO = 0 to 5.5V
—
—
±10
µA
IOZL
(3-State Output pins)
IOFF
Input/Output Power Off Leakage
VCC = 0V, VIN or VO ≤ 5.5V
—
—
±50
µA
VIK
Clamp Diode Voltage
VCC = 2.3V, IIN = –18mA
—
–0.7
–1.2
V
VH
ICCL
ICCH
ICCZ
ΔICC
Input Hysteresis
Quiescent Power Supply Current
VCC = 3.3V
VCC = 3.6V
VIN = GND or VCC
—
—
100
—
—
10
mV
µA
3.6 ≤ VIN ≤ 5.5V(2)
One input at VCC - 0.6V, other inputs at VCC or GND
—
—
—
—
10
500
µA
IIH
IIL
Quiescent Power Supply Current
Variation
NOTES:
1. Typical values are at VCC = 3.3V, +25°C ambient.
2. This applies in the disabled state only.
OUTPUT DRIVE CHARACTERISTICS
Symbol
VOH
Test Conditions(1)
Parameter
Output HIGH Voltage
Output LOW Voltage
Max.
Unit
VCC – 0.2
—
V
VCC = 2.3V to 3.6V
IOH = – 0.1mA
VCC = 2.3V
IOH = – 6mA
2
—
VCC = 2.3V
IOH = – 12mA
1.7
—
VCC = 2.7V
2.2
—
VCC = 3V
2.4
—
2.2
—
VCC = 3V
VOL
Min.
IOH = – 24mA
VCC = 2.3V to 3.6V
IOL = 0.1mA
—
0.2
VCC = 2.3V
IOL = 6mA
—
0.4
IOL = 12mA
—
0.7
VCC = 2.7V
IOL = 12mA
—
0.4
VCC = 3V
IOL = 24mA
—
0.55
V
NOTE:
1. VIH and VIL must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate VCC range.
TA = – 40°C to + 85°C.
3
IDT74LVC245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
OPERATING CHARACTERISTICS, VCC = 3.3V ± 0.3V, TA = 25°C
Symbol
Parameter
CPD
Power Dissipation Capacitance per Transceiver Outputs enabled
CPD
Power Dissipation Capacitance per Transceiver Outputs disabled
Test Conditions
Typical
Unit
CL = 0pF, f = 10Mhz
47
pF
2
SWITCHING CHARACTERISTICS(1)
VCC = 2.7V
Symbol
VCC = 3.3V ± 0.3V
Parameter
Min.
Max.
Min.
Max.
Unit
tPLH
Propagation Delay
—
7.3
1.5
6.3
ns
—
9.5
1.5
8.5
ns
—
8.5
1.7
7.5
ns
—
—
—
1
ns
tPHL
Ax to Bx, Bx to Ax
tPZH
Output Enable Time
tPZL
OE to Ax or Bx
tPHZ
Output Disable Time
tPLZ
OE to Ax or Bx
tSK(o)
Output Skew(2)
NOTES:
1. See TEST CIRCUITS AND WAVEFORMS. TA = – 40°C to + 85°C.
2. Skew between any two outputs of the same package and switching in the same direction.
4
IDT74LVC245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
Symbol
VCC(1)= 3.3V±0.3V VCC(1)= 2.7V
VIH
VT
0V
VOH
VT
VOL
SAME PHASE
INPUT TRANSITION
VCC(2)= 2.5V±0.2V
Unit
VLOAD
6
6
2 x Vcc
V
VIH
2.7
2.7
Vcc
V
VT
1.5
1.5
Vcc / 2
V
VLZ
300
300
150
mV
VHZ
300
300
150
mV
CL
50
50
30
pF
tPLH
tPHL
tPLH
tPHL
OUTPUT
VIH
VT
0V
OPPOSITE PHASE
INPUT TRANSITION
LVC Link
Propagation Delay
VLOAD
VCC
VIN
Pulse (1, 2)
Generator
tPZL
VOUT
D.U.T.
OUTPUT
SWITCH
NORMALLY
VLOAD
LOW
tPZH
OUTPUT SWITCH
NORMALLY
GND
HIGH
500Ω
RT
VIH
VT
0V
CONTROL
INPUT
GND
500Ω
DISABLE
ENABLE
Open
CL
LVC Link
Test Circuit for All Outputs
tPLZ
VLOAD/2
VT
VLOAD/2
VOL+VLZ
VOL
tPHZ
VOH
VOH-VHZ
0V
VT
0V
LVC Link
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
Enable and Disable Times
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
NOTES:
1. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.
2. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2ns; tR ≤ 2ns.
SWITCH POSITION
Switch
DATA
INPUT
VLOAD
TIMING
INPUT
Disable High
Enable High
GND
ASYNCHRONOUS
CONTROL
All Other Tests
Open
SYNCHRONOUS
CONTROL
Test
Open Drain
Disable Low
Enable Low
INPUT
OUTPUT 1
tPLH1
VIH
VT
0V
tPHL1
tSK (x)
tSK (x)
tPLH2
tREM
tSU
tH
Set-up, Hold, and Release Times
VOH
VT
VOL
LOW-HIGH-LOW
PULSE
VT
tW
HIGH-LOW-HIGH
PULSE
tPHL2
VT
Pulse Width
tSK(x) = tPLH2 - tPLH1 or tPHL2 - tPHL1
Output Skew - tSK(X)
tH
LVC Link
VOH
VT
VOL
OUTPUT 2
tSU
VIH
VT
0V
VIH
VT
0V
VIH
VT
0V
VIH
VT
0V
LVC Link
NOTES:
1. For tSK(o) OUTPUT1 and OUTPUT2 are any two outputs.
2. For tSK(b) OUTPUT1 and OUTPUT2 are in the same bank.
5
LVC Link
IDT74LVC245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
X
LVC
XX
XX
XXXX
Temp. Range
Bus-Hold Device Type Package
CORPORATE HEADQUARTERS
6024 Silver Creek Valley Road
San Jose, CA 95138
SO
SOG
PY
PYG
Q
QG
PG
PGG
Small Outline IC (gull wing)
SOIC - Green
Shrink Small Outline Package
SSOP - Green
Quarter Size Small Outline Package
QSOP - Green
Thin Shrink Small Outline Package
TSSOP - Green
245A
Octal Bus Transceiver with 3-State Outputs, ±24mA
Blank
No Bus-hold
74
–40°C to +85°C
for SALES:
800-345-7015 or 408-284-8200
fax: 408-284-2775
www.idt.com
6
for Tech Support:
logichelp@idt.com
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