Document
NEW PRODUCT
74LVC245A
OCTAL BUS TRANSCEIVER WITH 3 STATE OUTPUTS
Description
The 74LVC245A 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.
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)
Pin Assignments
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.
74LVC245A
Document number: DS35890 Rev. 1 - 2
1 of 10 www.diodes.com
August 2014
© Diodes Incorporated
NEW PRODUCT
74LVC245A
Ordering Information
74 LVC 245A xxx -13
Logic Device 74 : Logic Prefix
245 :
Function
Octal Bus Transceiver with 3-state Outputs
Package
T20 : TSSOP-20 Q20 : QFN-20
Packing -13 : 13” Tape & Reel
Part Number 74LVC245AT20-13 74LVC245AQ20-13
Package Code
T20
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
Output Enable 1 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
74LVC245A
Document number: DS35890 Rev. 1 - 2
2 of 10 www.diodes.com
August 2014
© Diodes Incorporated
NEW PRODUCT
74LVC245A
Absolute Maximum Ratings (Notes 6 & 7)
Symbol ESD HBM ESD CDM ESD MM
VCC VI IIK IOK IO ICC IGND TJ TSTG PTOT
Description Human Body Model ESD Protection Charged Device Model ESD Protection Machine Model ESD Protection Supply Voltage Range Input Voltage Range note 3
Input Clamp Current VI< 0V Output Clamp Current VO< 0V Continuous Output Current -0.5V < VO VCC +0.5V Continuous Current Through VCC Continuous Current Through GND Operating Junction Temperature Storage Temperature Total Power Dissipation
Rating 2 1
200 -0.5 to +7.0 -0.5 to +7.0
-20 -50 ±50 100 -100 -40 to +150 -65 to +150 500
Unit kV kV V V V mA mA mA mA mA °C °C mW
Notes:
6. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values and device operation should be within recommend values.
7. Forcing the maximum allowed voltage could cause a condition exceeding the maximum current or conversely forcing the maximum current could cause a condition exceeding the maximum voltage. The ratings of both .