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Diodes Semiconductor Electronic Components Datasheet

74LVCH245A Datasheet

OCTAL BUS TRANSCEIVER

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74LVCH245A pdf
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
ƒ Exceeds 200-V Machine Model (A115)
ƒ Exceeds 2000-V Human Body Model (A114)
ƒ Exceeds 1000-V Charged Device Model (C101)
Latch-Up Exceeds 250mA per JESD 78, Class I
All devices are:
ƒ Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2)
ƒ Halogen and Antimony Free. “Green” Device (Note 3)
Applications
General Purpose Logic
Bus Driving
Power Down Signal Isolation
Wide array of products such as:
ƒ PCs, Notebooks, Netbooks, Ultrabooks
ƒ Networking Computer Peripherals, Hard Drives, CD/DVD
ROM
ƒ 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


Diodes Semiconductor Electronic Components Datasheet

74LVCH245A Datasheet

OCTAL BUS TRANSCEIVER

No Preview Available !

74LVCH245A pdf
74LVCH245A
Ordering Information
74 LVC H245A xxx -13
Logic Device
74 : Logic Prefix
Function
H245 :
OCTAL BUS
TRANSCEIVER
WITH BUS
HOLD / 3
STATE
OUTPUTS
Package
T20 : TSSOP-20
Q20 : QFN-20
Packing
-13 : 13” Tape & Reel
Part Number
Package
Code
74LVCH245AT20-13
T20
74LVCH245AQ20-13
Q20
Package
(Note 4 & 5)
TSSOP-20
V-QFN4525-20
Package
Size
6.4mm X 6.5mm X 1.2mm
0.65 mm lead pitch
2.5mm X 4.5mm X 0.95mm
0.50 mm lead pitch
13” Tape and Reel
Quantity
Part Number Suffix
2500/Tape & Reel
-13
2500/Tape & Reel
-13
Notes:
4. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
5. V-QFN4525-20 is a JEDEC recognized naming convention that specifies the package thickness category as V and the number 4525 describes the
package as 4.5mm X 2.5mm.
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin
Name
DIR
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
2A1
1Y4
2A2
1Y3
2A3
1Y2
2A4
1Y1
2OE
Vcc
Description
Direction Control
Data Input
Data Output
Data Input
Data Output
Data Input
Data Output
Data Input
Data Output
Ground
Data Input
Data Output
Data Input
Data Output
Data Input
Data Output
Data Input
Data Output
Output Enable 2
Supply Voltage
Logic Diagram
Function Table
INPUTS
OE DIR
LL
LH
HX
Operation
B Data to A Bus
A Data to B Bus
Bus Isolation
74LVCH245A
Document number: DS35891 Rev. 1 - 2
2 of 10
www.diodes.com
July 2014
© Diodes Incorporated


Part Number 74LVCH245A
Description OCTAL BUS TRANSCEIVER
Maker Diodes
Total Page 10 Pages
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