74AVCH1T45
SINGLE BIT DUAL POWER SUPPLY TRANSLATING
TRANSCEIVER WITH 3 STATE OUTPUTS
Description
The 74AVCH1T45 is a single bit, dual supply transceiver with 3-state
outputs suitable for transmitting a single logic bit across different
voltage domains. The 74AVCH1T45 is a variant of the 74AVC1T45
that includes a bus hold feature at each input. The A input/output pin
is designed to track V
CCA
while the B input/output tracks V
CCB
. This
arrangement allows for universal low-voltage translation between any
voltages from 1.2V to 3.6V. The Direction pin (DIR) controls the
direction of the transceiver and in a logic voltage related to V
CCA
.
When a high logic level is applied to DIR the A pin becomes an input
and the B pin becomes the output. Conversely the roles of A and B
are reversed when DIR is asserted low.
The 3-state feature occurs when either of the power supply voltages
are zero. This is also an Ioff feature and allows for the output to
remain in a high impedance state with both power supplies at 0V
preventing damaging backflow currents and providing power down
electrical isolation up to 3.6 V as not to interfere with any logic activity
on pin A or B.
The bus hold feature maintains the previous logic level therefore a
valid logic level is always present eliminating the need for additional
resistors for an unused or disconnected inputs.
Pin Assignments
(Top View )
Vcc(A)
1
GND
2
A
3
SOT26
SOT363
(Bottom View)
A
3
GND
2
Vcc(A)
1
6
Vcc(B)
5
DIR
4
B
(Top View )
Vcc(A)
1
GND
2
A
3
6
NEW PRODUCT
Vcc(B)
5
DIR
4
B
4
B
5
DIR
6
Vcc(B)
X1-DFN1010-6
X2-DFN0910-6
X2-DFN1410-6
X2-DFN1409-6
Chip Scale
Alternative
Features
Wide Supply Voltage Range:
V
CC
(A): from 1.2V to 3.6V
V
CC
(B): from 1.2V to 3.6V
± 12mA Output Drive at 3.3V
High Noise Immunity - (100mV hysteresis typical)
I
OFF
Supports Partial-Power-Down Mode Operation
I
OFF
controlled by either V
CC
being at 0V
Inputs accept up to 4.6V
ESD Protection Exceeds JESD 22
200-V Machine Model (A115)
2000-V Human Body Model (A114)
1000 V Charged Device Model ( C101)
Latch-Up Exceeds 100mA per JESD 78, Class I
X2-DFN1409-6 package designed as a direct replacement for
chip scale packaging.
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Voltage Level Translation:
Well suited to join logic types operating at different voltages
Power Down Signal Isolation:
If either voltage domain is turned off the signal is isolated and
there is no loading on signal lines
Wide array of products such as:
Cell Phones, Tablets, E-Readers
PCs, Notebooks, Netbooks, Ultrabooks
Networking, Routers, Gateways
Computer Peripherals, Hard Drives, CD/DVD ROMs
TVs, DVDs, DVRs, Set Top Boxes
Personal Navigation / GPS
MP3 players, Cameras, Video Recorders
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.
74AVCH1T45
Document number: DS40288 Rev. 1 - 2
1 of 17
www.diodes.com
January 2018
© Diodes Incorporated
74AVCH1T45
Logic Diagram
DIR
5
Input
A
3
Bus
Hold
Bus
Hold
NEW PRODUCT
10 k
Ω
4
B
Bus Hold Circuit
Previous Input is Latched
Input Signals must be strong
enough to override 10kΩ
V
CC
(A)
V
CC
(B)
Absolute Maximum Ratings
(Note 5) (@T
A
= +25°C, unless otherwise specified.)
Symbol
ESD HBM
ESD CDM
ESD MM
V
CC
(A), V
CC
(B)
V
I
V
O
V
O
I
IK
I
OK
I
O
T
J
T
STG
Note:
Parameter
Human Body Model ESD Protection
Charged Device Model ESD Protection
Machine Model ESD Protection
Supply Voltage Range
Input Voltage Range
Voltage Applied to Output in High Impedance or I
OFF
State
Voltage Applied to Output in High or Low State
Input Clamp Current V
I
<0
Output Clamp Current
Continuous Output Current
Continuous Current Through V
CC
or GND
Operating Junction Temperature
Storage Temperature
A pin
B pin
Rating
2
1
200
-0.5 to +4.6
-0.5 to +4.6
-0.5 to +4.6
-0.5 to V
CC
(A) +0.5
-0.5 to V
CC
(B) +0.5
-50
-50
±50
±100
-40 to +150
-65 to +150
Unit
kV
kV
V
V
V
V
V
V
mA
mA
mA
mA
°C
°C
5. 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.
74AVCH1T45
Document number: DS40288 Rev. 1 - 2
3 of 17
www.diodes.com
January 2018
© Diodes Incorporated
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