IDT74LVC4245ASO [ETC]
Single 8-bit Bus Transceiver ; 一个8位总线收发器\n
| 型号： | IDT74LVC4245ASO |
| 厂家： | 
ETC |
| 描述： | Single 8-bit Bus Transceiver
|
| 文件： | 总8页 (文件大小：146K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CMOS OCTAL BUS
IDT74LVC4245A
TRANSCEIVER AND 3.3V TO 5V
SHIFTER WITH 3-STATE OUT-
PUTS AND 5 VOLT TOLERANT I/O
DESCRIPTION:
FEATURES:
–
–
–
–
–
–
–
–
0.5 MICRON CMOS Technology
VCCA = 5V ±0.5V
VCCB = 2.7V to 3.6V
CMOS power levels (0.4µW typ. static)
Rail-to-Rail output swing for increased noise margin
All inputs, outputs and I/O are 5 Volt tolerant
Supports hot insertion
The LVC4245A is manufactured using advanced dual metal CMOS
technology.Thisoctalnoninvertingbustransceivercontainstwoseparate
supply rails; B port has VCCB, which is set at 3.3V, and A port has VCCA,
which is set at 5V. This allows for translation from a 3.3V to a 5V
environment,andvice-versa.
Thisdeviceisidealforasynchronouscommunicationbetweentwobuses
(AandB).Thedirectioncontrolpin(DIR)controlsthedirectionofdataflow.
The output enable pin (OE) overrides the direction control and disables
both ports. All inputs are designed with hysteresis for improved noise
margin.
Available in SOIC, SSOP, QSOP, and TSSOP packages
Drive Features for LVC4245A:
–
–
High Output Drivers: ±24mA
Reduced system switching noise
The LVC4245A has been designed with a ±24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining
speedperformance.
APPLICATIONS:
• 5V and 3.3V mixed voltage systems
• Data communication and telecommunication systems
FUNCTIONALBLOCKDIAGRAM
2
DIR
22
OE
3
A1
21
B1
4
A2
20
B2
5
A3
19
B3
6
A4
18
B4
7
A5
17
B5
8
A6
16 B6
9
A7
15
B7
10
A8
14
B8
INDUSTRIAL TEMPERATURE RANGE
JULY 2000
1
c
1999 Integrated Device Technology, Inc.
DSC-4754/-
IDT74LVC4245A
CMOSOCTALBUSTRANSCEIVERAND3.3VTO5VSHIFTER
INDUSTRIALTEMPERATURERANGE
PINCONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(1)
FOR VCCA
Symbol
VTERM
TSTG
Description
Terminal Voltage with Respect to GND
Storage Temperature
Max.
Unit
V
24
23
22
21
20
19
18
17
16
15
14
13
1
2
VCCB (3.3V)
(5V) VCCA
DIR
– 0.5 to +6.5
– 65 to +150
– 50 to +50
– 50
VCCB (3.3V)
°C
IOUT
DC Output Current
mA
mA
OE
B1
A1
A2
3
4
IIK
Continuous Clamp Current,
VI < 0 or VO < 0
IOK
ICC
ISS
Continuous Current through
each VCC or GND
±100
mA
B2
A3
A4
A5
5
6
7
8
9
SO24-2
SO24-7
SO24-8
SO24-9
B3
B4
B5
A6
A7
ABSOLUTE MAXIMUM RATINGS
B6
(1)
FOR VCCB
B7
A8
10
11
12
Symbol
VTERM
TSTG
Description
Terminal Voltage with Respect to GND
Storage Temperature
Max.
Unit
V
– 0.5 to +6.5
– 65 to +150
– 50 to +50
– 50
B8
GND
GND
°C
GND
IOUT
DC Output Current
mA
mA
IIK
Continuous Clamp Current,
VI < 0 or VO < 0
SOIC/ SSOP/ QSOP/ TSSOP
TOP VIEW
IOK
ICC
ISS
Continuous Current through
each VCC or GND
±100
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.
PIN DESCRIPTION
Pin Names
Description
OE
DIR
Ax
Output Enable Input (Active LOW)
Direction Control Input
Port A Inputs or 3-State Outputs
Port B Inputs or 3-State Outputs
Bx
CAPACITANCE (TA = +25°C, f = 1.0MHZ)
Symbol
Parameter(1)
Conditions
VIN = 0 or VCCA
VCCA = Open
Typ. Max. Unit
FUNCTION TABLE (1)
CIN
Input Capacitance
5
—
—
—
pF
pF
pF
Inputs
CI/O
CI/O
I/O Port
Capacitance(2)
VOUT = VCCA or GND,
VCCA = 5V
11
11
OE
L
DIR
L
Outputs
Bus B Data to Bus A
I/O Port
Capacitance(3)
VOUT = VCCB or GND,
VCCB = 3.3V
L
H
Bus A Data to Bus B
High Z State
H
X
NOTES:
1. As applicable to the device type.
2. For A port only.
3. For B port only.
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
2
IDT74LVC4245A
INDUSTRIALTEMPERATURERANGE
CMOSOCTALBUSTRANSCEIVERAND3.3VTO5VSHIFTER
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (A PORT)
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: TA = – 40°C To +85°C; VCCA = 5V±0.5V(1)
Symbol
Parameter
Test Conditions
VCCA = 4.5V to 5.5V
Min.
Typ.(2)
Max.
Unit
VIH
Input HIGH Voltage Level
2
—
—
V
VIL
Input LOW Voltage Level
VCCA = 4.5V to 5.5V
VCCA = 5.5V
—
—
—
—
0.8
±1
V
IIH
Input Leakage Current (control inputs)
VI = 0 to 5.5V
VO = 0 to 5.5V
µA
IIL
IOZH
High Impedance Output Current
(3-State Output pins)
VCCA = 5.5V
—
—
±5
µA
IOZL
VH
Input Hysteresis
VCCA = 5.0V
VCCA = 5.5V
—
—
100
—
—
80
mV
µA
ICCL
ICCH
ICCZ
Quiescent Power Supply Current
VIN = GND or VCCA
∆ICC
Quiescent Power Supply Current Variation
One input at 3.4V, other inputs at VCCA or GND
VCCA = 4.5V to 5.5V
—
—
1.5
mA
NOTES:
1. VCCB = 2.7V to 3.6V
2. Typical values are at VCCA = 5.0V, +25°C ambient.
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (B PORT)
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: TA = – 40°C To +85°C; VCCB = 2.7V To 3.6V (1)
Symbol
Parameter
Test Conditions
VCCB = 2.7V to 3.6V
Min.
Typ.(2)
Max.
Unit
VIH
Input HIGH Voltage Level
2
—
—
V
VIL
Input LOW Voltage Level
High Impedance Output Current
(3-State Output pins)
VCCB = 2.7V to 3.6V
VCCB = 3.6V
—
—
—
—
0.8
±5
V
IOZH
IOZL
VH
VO = 0 to VCCB
µA
Input Hysteresis
VCCB = 3.3V
VCCB = 3.6V
—
—
100
—
—
50
mV
µA
ICCL
ICCH
ICCZ
∆ICC
Quiescent Power Supply Current
VIN = GND or VCCB
Quiescent Power Supply Current Variation
One input at VCCB – 0.6V, other inputs at VCCB or GND
VCCB = 2.7V to 3.6V
—
—
500
µA
NOTES:
1. VCCA = 5V ± 0.5V
2. Typical values are at VCCB = 3.3V, +25°C ambient.
3
IDT74LVC4245A
CMOSOCTALBUSTRANSCEIVERAND3.3VTO5VSHIFTER
INDUSTRIALTEMPERATURERANGE
OUTPUT DRIVE CHARACTERISTICS, VCCA = 5V±0.5V (A PORT)
Symbol
Parameter
Output HIGH Voltage
Test Conditions(1)
Min.
Max.
Unit
VOH
VCCA = 4.5V
VCCA = 5.5V
VCCA = 4.5V
VCCA = 5.5V
VCCA = 4.5V
VCCA = 5.5V
VCCA = 4.5V
VCCA = 5.5V
IOH = – 0.1mA
4.3
—
V
(B port to A port)
5.3
3.7
4.7
—
—
—
IOH = – 24mA
IOL = 0.1mA
IOL = 24mA
—
VOL
Output LOW Voltage
(B port to A port)
0.2
0.2
0.55
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. T A = –40°C to +85°C, VCCB = 2.7V to 3.6V.
OUTPUT DRIVE CHARACTERISTICS, VCCB = 2.7V TO 3.6V (B PORT)
Symbol
Parameter
Output HIGH Voltage
Test Conditions(1)
Min.
Max.
Unit
VOH
VCCB = 2.7V to 3.6V
IOH = – 0.1mA
IOH = – 12mA
VCC – 0.2
—
V
(A port to B port)
VCCB = 2.7V
VCCB = 3.0V
VCCB = 3.0V
VCCB = 2.7V to 3.6V
VCCB = 2.7V
2.2
2.4
2
—
—
IOH = – 24mA
IOL = 0.1mA
IOL = 12mA
IOL = 24mA
—
VOL
Output LOW Voltage
(A port to B port)
—
—
—
0.2
0.4
0.55
V
VCCB = 3.0V
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. T A = –40°C to +85°C, VCCA = 5V ± 0.5V.
OPERATING CHARACTERISTICS, T = 25°C
A
VCCA = 5V, VCCB = 3.3V
Unit
pF
Symbol
Parameter
Test Conditions
Typical
CPD
Power dissipation capacitance per transceiver Outputs enabled
CL = 0pF, f = 10Mhz
39.5
CPD
Power dissipation capacitance per transceiver Outputs disabled
5
pF
4
IDT74LVC4245A
INDUSTRIALTEMPERATURERANGE
CMOSOCTALBUSTRANSCEIVERAND3.3VTO5VSHIFTER
SWITCHING CHARACTERISTICS (1)
VCCA = 5V±0.5V,
VCCB = 2.7V to 3.6V
Symbol
tPHL
Parameter
Min
1
Max.
6.3
6.7
6.1
5
Unit
ns
.
Propagation Delay
Ax to Bx
tPLH
tPHL
tPLH
tPZL
tPZH
tPZL
tPZH
tPLZ
tPHZ
tPLZ
tPHZ
1
Propagation Delay
Bx to Ax
1
ns
ns
ns
ns
ns
1
Output Enable Time
1
8.8
9.8
9
1
OE to Bx
Output Enable Time
1
1
8.1
7.7
7.8
7
OE to Ax
Output Disable Time
1
1
OE to Bx
Output Disable Time
1
1
5.8
OE to Ax
NOTE:
1. See test circuits and waveforms. TA = – 40°C to + 85°C.
5
IDT74LVC4245A
CMOSOCTALBUSTRANSCEIVERAND3.3VTO5VSHIFTER
INDUSTRIALTEMPERATURERANGE
LOADCIRCUITANDVOLTAGEWAVEFORMS
PARAMETERMEASUREMENTINFORMATION(APORT)
TESTCONDITIONS
LOADCIRCUIT
2 x VCC
Open
GND
TEST
S1
500Ω
S1
tPLH / tPHL
tPLZ / tPZL
tPHZ / tPZH
Open
2 x VCC
GND
From Output
Under Test
CL = 50pF
(see Note A)
500Ω
VOLTAGEWAVEFORMS
PULSEDURATION
VOLTAGEWAVEFORMS
ENABLEANDDISABLETIMES
LOW-ANDHIGH-LEVELENABLING
tW
3V
0V
Output
Control
VCC
0V
1.5V
1.5V
Input
1.5V
1.5V
tPZL
tPLZ
tPHZ
Output
Waveform 1
S1 at 2 X VCC
(see Note B)
VCC
50% VCC
VOL+0.3V
VOL
VOLTAGEWAVEFORMS
PROPAGATIONDELAYTIMES
NONINVERTINGOUTPUTS
t
PZH
50% VCC
VOH
Output
Waveform 2
S1 at GND
VOH-0.3V
0V
(see Note B)
VCC
1.5V
1.5V
Input
0V
tPHL
tPLH
VOH
50% VCC
50% VCC
Output
VOL
NOTES:
A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with intetnal conditions such that the output is LOW except when disabled by the output control.
Waveform 2 is for an output with intetnal conditions such that the output is HIGH except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10MHz; Zo = 50Ω; tF ≤ 2.5ns; tR ≤ 2.5ns.
D. The outputs are measured one at a time with one transition per measurement.
6
IDT74LVC4245A
INDUSTRIALTEMPERATURERANGE
CMOSOCTALBUSTRANSCEIVERAND3.3VTO5VSHIFTER
LOADCIRCUITANDVOLTAGEWAVEFORMS
PARAMETERMEASUREMENTINFORMATION(BPORT)
TESTCONDITIONS
LOADCIRCUIT
7V
Open
500Ω
TEST
S1
Open
7V
S1
From Output
Under Test
tPLH / tPHL
tPLZ / tPZL
tPHZ / tPZH
GND
CL = 50pF
(see Note A)
GND
500Ω
VOLTAGEWAVEFORMS
PULSEDURATION
VOLTAGEWAVEFORMS
ENABLEANDDISABLETIMES
LOW-ANDHIGH-LEVELENABLING
tW
3V
0V
Output
Control
3V
0V
1.5V
1.5V
Input
1.5V
1.5V
tPZL
tPLZ
tPHZ
Output
Waveform 1
S1 at 7V
3.5V
1.5V
VOL+0.3V
VOL
(see Note B)
VOLTAGEWAVEFORMS
PROPAGATIONDELAYTIMES
NONINVERTINGOUTPUTS
t
PZH
VOH
Output
Waveform 2
S1 at GND
1.5V
VOH-0.3V
0V
(see Note B)
3V
1.5V
1.5V
Input
0V
tPHL
tPLH
VOH
1.5V
1.5V
Output
VOL
NOTES:
A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with intetnal conditions such that the output is LOW except when disabled by the output control.
Waveform 2 is for an output with intetnal conditions such that the output is HIGH except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10MHz; Zo = 50Ω; tF ≤ 2.5ns; tR ≤ 2.5ns.
D. The outputs are measured one at a time with one transition per measurement.
7
IDT74LVC4245A
CMOSOCTALBUSTRANSCEIVERAND3.3VTO5VSHIFTER
INDUSTRIALTEMPERATURERANGE
ORDERINGINFORMATION
IDT
XX
LVC
X
XXXX
XX
Device Type Package
Temp. Range
Bus-Hold
Small Outline IC (gull wing) (SO24-2)
SO
PY
Q
Shrink Small Outline Package (SO24-7)
Quarter Size Small Outline Package (SO24-8)
Thin Shrink Small Outline Package (SO24-9)
PG
4245A
Octal Bus Transceiver and 3.3V to 5V Shifter with 3-State
Outputs, ±24mA
Blank
74
No Bus-hold
–40°C to +85°C
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The IDT logo is a registered trademark of Integrated Device Technology, Inc.
8
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