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PDF 74LVCH245A Data sheet ( Hoja de datos )
| Número de pieza | 74LVCH245A | |
| Descripción | OCTAL BUS TRANSCEIVER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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74LVCH245A
OCTAL BUS TRANSCEIVER WITH BUS HOLD / 3 STATE OUTPUTS
Description
The 74LVCH245A is an octal transceiver designed for asynchronous
communication 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) pin can be used to disable the device so the buses effectively are
isolated.
The device is designed for operation with a power supply range of
1.65V to 3.6V.
The inputs are tolerant to 5.5V allowing this device to be used in a
mixed voltage environment. The device is fully specified for partial
power down applications using IOFF. The IOFF circuitry disables the
output preventing damaging current backflow when the device is
powered down.
Pin Assignments
Bus hold circuitry holds unused or undriven inputs at a high or low
logic state. The use of external pull-up or pull down resistors is not
recommended.
Features
• Supply Voltage Range from 1.65V to 3.6V
• Sinks or Sources 24ma at VCC = 3V
• CMOS Low Power Consumption
• IOFF Supports Partial Power Down Operation
• Inputs or Outputs Accept Up to 5.5V
• Inputs Can Be Driven by 3.3V or 5V Allowing for Mixed Voltage
Applications
• Schmitt Trigger Action at All Inputs
• Typical VOLP (Quiet Output Ground Bounce) Less Than 0.8V with
VCC = 3.3V and TA = +25°C
• Typical VOHV (Quiet Output dynamic VOH) Greater than 2.0V with
VCC = 3.3V and TA = +25°C
• ESD Protection Tested per JESD 22
Exceeds 200-V Machine Model (A115)
Exceeds 2000-V Human Body Model (A114)
Exceeds 1000-V Charged Device Model (C101)
• Latch-Up Exceeds 250mA per JESD 78, Class I
• All devices are:
Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
• General Purpose Logic
• Bus Driving
• Power Down Signal Isolation
• Wide array of products such as:
PCs, Notebooks, Netbooks, Ultrabooks
Networking Computer Peripherals, Hard Drives, CD/DVD
ROM
TV, DVD, DVR, Set Top Box
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen and Antimony free,
"Green" and Lead-Free.
3. Halogen and Antimony free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
74LVCH245A
Document number: DS35891 Rev. 1 - 2
1 of 10
www.diodes.com
July 2014
© Diodes Incorporated
1 page  
74LVCH245A
Switching Characteristics
Symbol
Parameter
Test
Conditions
tPD
tEN
tDIS
tsk(0)
Propagation
Delay AN to BN
or BN to AN
Figure 1
Enable Time
OE to AN
or OE to BN
Disable Time
OE to AN
or OE to BN
Output Skew
Time
Figure 1
Figure 1
VCC
1.8V ± 0.15V
2.5V ± 0.2V
2.7V
3.3V ± 0.3V
1.8V ± 0.15V
2.5V ± 0.2V
2.7V
3.3V ± 0.3V
1.8V ± 0.15V
2.5V ± 0.2V
2.7V
3.3V ± 0.3V
3.3V ± 0.3V
TA = +25°C
Min Ty Max
1 6.0 12.2
1 3.9 8.1
1 4.2 8.7
1.5 3.8 8.1
1 7 14.8
1 4.5 10
1 5.4 9.3
1.5 4.4 8.3
1 7.8 16.5
149
1 4.4 8.3
1.7 4.1 7.3
— — 1.0
TA = -40°C to
+85°C
Min Max
1 12.7
1 8.5
1 9.6
1.5 8.7
1 15.3
1 10.5
1 9.5
1.5 8.5
1 17
1 9.5
1 8.5
1.7 7.5
——
TA = -40°C to
+125°C
Min Max
1 16.9
1 9.1
1 9.9
1.5 9.2
1 22.5
1 12.4
1 12.0
1.5 11.0
1 18.4
1 10.5
1 10.0
1.7 9.0
— 1.5
Unit
ns
ns
ns
ns
Operating Characteristics
TA = +25°C
Symbol
Parameter
Test Conditions
Cpd
Power dissipation
F = 10MHz
capacitance per gate Outputs Enabled
VCC
1.8V ± 0.15V
2.5V ± 0.2V
3.3V ± 0.3V
Typ
9.9
10.2
10.6
Unit
pF
Package Characteristics
Symbol
θJA
θJC
θJA
θJC
Parameter
Thermal Resistance
Junction-to-Ambient
Thermal Resistance
Junction-to-Case
Thermal Resistance
Junction-to-Ambient
Thermal Resistance
Junction-to-Case
Package
TSSOP-20
Test Conditions
Min
Typ
Max Unit
(Note 8)
— 74 — °C/W
TSSOP-20
(Note 8)
— 15 — °C/W
V-QFN4525-20
(Note 8)
— 67 — °C/W
V-QFN4525-20
(Note 8)
— 20 — °C/W
Note:
8. Test conditions for TSSOP-20 and V-QFN4525-20: Devices mounted on 4 layer FR-4 substrate PC board, 2oz copper, with minimum recommended
pad layout per JESD 51-7.
74LVCH245A
Document number: DS35891 Rev. 1 - 2
5 of 10
www.diodes.com
July 2014
© Diodes Incorporated
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet 74LVCH245A.PDF ] | |
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