BCT0102
2-Bit Bidirectional
Voltage-Level Translator
BCT0102
2-Bit Bidirectional Voltage-Level Translator
GENERAL DESCRIPTION
FEATURES
This two-bit non-inverting translator is a
bidirectional voltage-level translator and can be
used to establish digital switching compatibility
between mixed-voltage systems. It uses two
separate configurable power-supply rails, with the
A ports supporting operating voltages from 1.65V
to 5.5V while it tracks the VCCA supply, and the B
ports supporting operating voltages from 2.3V to
5.5V while it tracks the VCCB supply. This allows
the support of both lower and higher logic signal
levels while providing bidirectional translation
capabilities between any of the 1.8V, 2.5V, 3.3V,
and 5V voltage nodes.
When the output-enable (OE) input is low, all
I/Os are placed in the high-impedance state,
which significantly reduces the power-supply
quiescent current consumption. OE has an
internal pull-down current source, as long as
VCCA is powered.
To ensure the high-impedance state during
power up or power down, OE should be tied to
GND through a pull-down resistor; the minimum
value of the resistor is determined by the
current-sourcing capability of the driver.
No Direction-Control Signal Needed
Data Rates
24Mbps (Push-Pull)
2Mbps (Open-Drain)
1.65V to 5.5V on A Ports and 2.3V to 5.5V on
B Ports (VCCA ≤ VCCB)
VCC Isolation: If Either VCC is at GND, Both
Ports are in the High-Impedance State
No Power-Supply Sequencing Required,
Either VCCA or VCCB can be Ramped First
IOFF: Supports Partial-Power-Down Mode
Operation
Available in TSOT23-8, XTDFN1.4X1.0-8L,
QFN1.4X1.2-8L package.
APPLICATIONS
I2C BUS
Portable POS Systems
Smart Card Readers
Cell-Phones
GPS
Portable Communication Devices
ORDERING INFORMATION
Order Number
Package Type
Temperature Range
Marking
QTY/Reel
BCT0102EDA-TR
TSOT23-8
-40°C to +85°C
SAXX
4000
BCT0102ETA-TR
XTDFN1.4X1.0-8L
-40°C to +85°C
SAXX
3000
BCT0102EGA-TR
QFN1.4X1.2-8L
-40°C to +85°C
SAXX
3000
Note 1: "SA" in Marking is product short code for BCT0102.
"XX" in Marking will be appeared as the batch code.
REV2.4
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1
BCT0102
2-Bit Bidirectional
Voltage-Level Translator
PIN CONFIGURATION (Top View)
1
B1
2
B2
3
OE
4
MARKING
VCCB
VCCA
1
8
VCCB
A1
A1
2
7
B1
6
A2
A2
3
6
B2
5
GND
GND
4
5
OE
8
VCCA
7
TSOT23-8
XTDFN1.4X1.0-8L
VCCA
1
A1
2
8
A2
3
7
B1
GND
4
6
B2
VCCB
5
OE
QFN1.4X1.2-8L
PIN DESCRIPTION
PIN
NAME
FUNCTION
SOT
DFN/QFN
1
8
VCCB
2
7
B1
Input/Output B. Referenced to VCCB.
3
6
B2
Input/Output B. Referenced to VCCB.
4
5
OE
5
4
GND
6
3
A2
Input/Output A. Referenced to VCCA.
7
2
A1
Input/Output A. Referenced to VCCA.
8
1
VCCA
B-Port Supply Voltage. 2.3V≤VCCB≤5.5V.
Output Enable (Active High). Pull OE low to place all outputs in 3-state
mode. Referenced to VCCA.
Ground.
A-Port Supply Voltage. 1.65V≤VCCA≤5.5V and VCCA≤VCCB.
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
ABSOLUTE MAXIMUM RATINGS
VCCA, Supply Voltage Range....................................................................................................................... -0.3V to 6V
VCCB, Supply Voltage Range....................................................................................................................... -0.3V to 6V
VI, A Port, B Port, OE Input Voltage Range (2)........................................................................................... -0.3V to 6V
VO, Voltage Range Applied to Any Output in the High- Impedance or Power-Off State (2)
A
Port....................................................................................................................................................... -0.3V to 6V
B
Port....................................................................................................................................................... -0.3V to 6V
VO, Voltage Range Applied to Any Output in the High or Low State (2) (3)
A Port........................................................................................................................................... -0.3V to VCCA + 0.3V
B Port........................................................................................................................................... -0.3V to VCCB + 0.3V
IIK, Input Clamp Current (VI < 0) ....................................................................................................................... -50mA
IOK, Output Clamp Current (VO < 0) ................................................................................................................. -50mA
IO, Continuous Output Current.......................................................................................................................... ±50mA
Continuous Current through VCCA, VCCB, or GND...................................................................................… ±100mA
Operating Temperature Range............................................................................................................. -40℃ to +85℃
Junction Temperature.......................................................................................................................................... 150℃
Storage Temperature Range.............................................................................................................. -65℃ to +150℃
Lead Temperature (Soldering, 10sec)................................................................................................................. 260℃
ESD
HBM B Port............................................................................................................................................................8KV
HBM Other Pin.......................................................................................................................................................4KV
NOTE:
1.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not
implied. Exposure to absolute Maximum rating conditions for extended periods may affect device reliability.
2.
The input and output negative-voltage ratings may be exceeded if the input and output current ratings are observed.
3.
The value of VCCA and VCCB are provided in the recommended operating conditions table.
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
ELECTRICAL CHARACTERISTICS
(VCCA = 1.65V to 5.5V, VCCB = 2.3V to 5.5V, typical values are at TA = +25℃, unless otherwise noted)
PARAMETER
CONDITIONS
RECOMMENDED OPERATING CONDITIONS
Supply Voltage
(3)
MIN
TYP
MAX
UNITS
(1) (2)
VCCA
1.65
5.5
VCCB
2.3
5.5
VCCA = 1.65V to 1.95V, VCCB = 2.3V to 5.5V
VCCI - 0.2
VCCI
VCCA = 2.3V to 5.5V, VCCB = 2.3V to 5.5V
VCCI - 0.4
VCCI
B Port I/Os
VCCI - 0.4
VCCI
OE Input
VCCA×0.8
5.5
A Port I/Os
0
0.15
B Port I/Os
0
0.15
OE Input
0
VCCA×0.25
V
A Port I/Os
High-Level Input Voltage
(VIH)
V
Low-Level Input Voltage
V
(VIL)
Input Transition Rise or Fall Rate (Δt/ΔV)
A Port I/Os Push-Pull Driving
10
B Port I/Os Push-Pull Driving
10
Control Input
10
ns/V
ELECTRICAL CHARACTERISTICS
A Port High Level Output Voltage (VOHA)
IOH = -20µA, VIB ≥VCCB - 0.4V
A Port Low Level Output Voltage (VOLA)
IOL = 1mA, VIB ≤ 0.15V
B Port High Level Output Voltage (VOHB)
IOH = -20µA, VIA ≥VCCA - 0.4V
B Port Low Level Output Voltage (VOLB)
IOL = 1mA, VIA ≤ 0.15V
Input Leakage Current (II)
VCCA×0.7
0.4
V
VCCB×0.7
OE
0.4
0.5
Power Off Leakage
A Port
VCCA = 0V, VCCB = 0V to 5.5V
0.1
Current (IOFF)
B Port
VCCA = 0V to 5.5V, VCCB = 0V
0.1
OE = 0V
0.1
3-State Output Leakage (IOZ)
A or B Port
μA
VCCA = 1.65V to VCCB, VCCB
0.1
VI = VO = OPEN,
= 2.3V to 5.5V
IO = 0
VCCA =5.5V, VCCB = 0V
0.1
VCCA = 0V, VCCB = 5.5V
0.1
Quiescent Supply Current (ICCA)
VCCA = 1.65V to VCCB, VCCB
Quiescent Supply Current (ICCB)
Quiescent Supply Current (ICCA + ICCB)
μA
7
VI = VO = OPEN,
= 2.3V to 5.5V
IO = 0
VCCA =5.5V, VCCB = 0V
0.1
VCCA = 0V, VCCB = 5.5V
0.1
μA
VI = VO = OPEN,
VCCA = 1.65V to VCCB, VCCB
IO = 0
= 2.3V to 5.5V
μA
7.1
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
ELECTRICAL CHARACTERISTICS
(VCCA = 1.65V to 5.5V, VCCB = 2.3V to 5.5V, typical values are at TA = +25℃, unless otherwise noted)
PARAMETER
CONDITIONS
MIN
VCCA = 1.65V to VCCB,
Quiescent Supply Current (ICCZA)
TYP
MAX
UNITS
0.1
VI = VCCI, IO = 0,
VCCB = 2.3V to 5.5V
OE = GND
VCCA =5.5V, VCCB = 0V
0.1
VCCA = 0V, VCCB = 5.5V
0.1
μA
VCCA = 1.65V to VCCB,
0.1
VI = VCCI, IO = 0,
VCCB = 2.3V to 5.5V
OE = GND
VCCA =5.5V, VCCB = 0V
0.1
VCCA = 0V, VCCB = 5.5V
0.1
μA
Quiescent Supply Current (ICCZB)
OE Input Capacitance (CI)
VCCA = 3.3V, VCCB = 3.3V
Input/Output Capacitance A Port (CIO)
3.6
pF
5.4
VCCA = 3.3V, VCCB = 3.3V
Input/Output Capacitance B Port (CIO)
pF
6.3
NOTES:
1. VCCI is the VCC associated with the input port.
2. VCCO is the VCC associated with the output port.
3. VCCA must be less than or equal to VCCB, and VCCA must not exceed 5.5V.
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
TIMING REQUIREMENTS
(typical values are at TA = +25℃, unless otherwise noted)
VCCB = 2.5V
VCCB = 3.3V
VCCB = 5V
TYP
TYP
TYP
Push-Pull Driving
21
22
24
Open-Drain Driving
2
2
2
47
45
41
500
500
500
20
22
24
2
2
2
50
45
41
500
500
500
23
24
2
2
43
41
500
500
UNITS
(TA = +25℃ , VCCA = 1.8V, unless otherwise noted.)
Data Rate
Mbps
Push-Pull Driving
Pulse Duration (tW)
Data Inputs
Open-Drain Driving
ns
(TA = +25℃, VCCA = 2.5V, unless otherwise noted.)
Push-Pull Driving
Data Rate
Mbps
Open-Drain Driving
Push-Pull Driving
Pulse Duration (tW)
Data Inputs
Open-Drain Driving
ns
(TA = +25℃, VCCA = 3.3V, unless otherwise noted.)
Push-Pull Driving
Data Rate
Mbps
Open-Drain Driving
Push-Pull Driving
Pulse Duration (tW)
Data Inputs
Open-Drain Driving
ns
(TA = +25℃, VCCA = 5V, unless otherwise noted.)
Push-Pull Driving
24
Data Rate
Mbps
Open-Drain Driving
2
Push-Pull Driving
Pulse Duration (tW)
41
Data Inputs
Open-Drain Driving
ns
500
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
SWITCHING CHARACTERISTICS
(VCCA = 1.8V, typical values are at TA = +25℃, unless otherwise noted)
FROM
TO
TEST
(INPUT)
(OUTPUT)
CONDITIONS
PARAMETER
tPHL
A
VCCB = 3.3V
VCCB = 5V
Push-Pull Driving
2.4
3.0
4.3
Open-Drain Driving
26.0
26.3
26.7
Push-Pull Driving
4.0
3.6
3.5
Open-Drain Driving
175
145
110
Push-Pull Driving
2.0
1.9
2.1
Open-Drain Driving
26.0
26.1
26.2
Push-Pull Driving
1.7
1.5
1.4
Open-Drain Driving
133
69
51
B
tPLH
tPHL
B
VCCB = 2.5V
UNITS
ns
A
ns
tPLH
tEN (tPZH & tPZL)
OE
A or B
17
15
14
tDIS (tPHZ & tPLZ)
OE
A or B
614
616
626
Push-Pull Driving
6.6
5.8
5.4
Open-Drain Driving
89
31
10
Push-Pull Driving
5.6
4.6
3.9
Open-Drain Driving
128
98
58
Push-Pull Driving
2.9
2.7
2.6
Open-Drain Driving
1.9
1.7
1.6
Push-Pull Driving
4.6
5.9
8.0
Open-Drain Driving
2.2
2.3
2.9
0.5
0.5
0.5
Push-Pull Driving
21
22
24
Open-Drain Driving
2
2
2
ns
trA
A Port Rise Time
trB
B Port Rise Time
tfA
ns
A Port Fall Time
tfB
tsk(0)
ns
ns
B Port Fall Time
ns
Channel-to-Channel Skew
Data Rate
Mbps
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
SWITCHING CHARACTERISTICS
(VCCA = 2.5V, typical values are at TA = +25℃, unless otherwise noted)
FROM
TO
TEST
(INPUT)
(OUTPUT)
CONDITIONS
PARAMETER
VCCB = 2.5V
VCCB = 3.3V
VCCB = 5V
Push-Pull Driving
2.7
3.3
4.8
Open-Drain Driving
26.2
26.4
26.7
Push-Pull Driving
2.6
2.4
2.3
Open-Drain Driving
169
144
110
Push-Pull Driving
2.4
2.3
2.4
Open-Drain Driving
26.3
26.4
26.5
Push-Pull Driving
2.0
1.9
1.8
Open-Drain Driving
165
118
55
UNITS
tPHL
A
B
ns
tPLH
tPHL
B
A
ns
tPLH
tEN (tPZH & tPZL)
OE
A or B
14
13
12
tDIS (tPHZ & tPLZ)
OE
A or B
630
635
640
Push-Pull Driving
3.2
2.8
2.6
Open-Drain Driving
120
70
10
Push-Pull Driving
4.5
3.4
2.6
Open-Drain Driving
122
96
62
Push-Pull Driving
4.9
5.0
4.8
Open-Drain Driving
2.0
1.9
1.7
Push-Pull Driving
4.8
6.1
8.3
Open-Drain Driving
1.9
2.1
2.7
0.5
0.5
0.5
Push-Pull Driving
20
22
24
Open-Drain Driving
2
2
2
ns
trA
A Port Rise Time
trB
B Port Rise Time
tfA
ns
A Port Fall Time
tfB
tsk(0)
ns
ns
B Port Fall Time
ns
Channel-to-Channel Skew
ns
Data Rate
Mbps
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
SWITCHING CHARACTERISTICS
(VCCA = 3.3V, typical values are at TA = +25℃, unless otherwise noted)
FROM
TO
(INPUT)
(OUTPUT)
PARAMETER
TEST CONDITIONS
3.5
4.9
Open-Drain Driving
26.3
26.7
Push-Pull Driving
2.2
2.0
Open-Drain Driving
133
104
Push-Pull Driving
3.0
3.2
Open-Drain Driving
26.6
26.8
Push-Pull Driving
1.8
1.7
Open-Drain Driving
132
83
UNITS
B
ns
tPLH
tPHL
B
VCCB = 5V
Push-Pull Driving
tPHL
A
VCCB = 3.3V
A
ns
tPLH
tEN (tPZH & tPZL)
OE
A or B
12
11
tDIS (tPHZ & tPLZ)
OE
A or B
630
635
Push-Pull Driving
2.2
2.0
Open-Drain Driving
87
36
Push-Pull Driving
2.9
2.3
Open-Drain Driving
87
56
Push-Pull Driving
6.2
5.8
Open-Drain Driving
2.3
2.0
Push-Pull Driving
6.5
8.2
Open-Drain Driving
2.0
2.5
0.5
0.5
Push-Pull Driving
23
24
Open-Drain Driving
2
2
ns
trA
trB
tfA
tfB
tsk(0)
A Port Rise Time
ns
B Port Rise Time
ns
A Port Fall Time
ns
B Port Fall Time
ns
Channel-to-Channel Skew
ns
Data Rate
Mbps
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
SWITCHING CHARACTERISTICS
(VCCA = 5.0V, typical values are at TA = +25℃, unless otherwise noted)
FROM
TO
TEST
(INPUT)
(OUTPUT)
CONDITIONS
PARAMETER
tPHL
A
VCCB = 5V
Push-Pull Driving
5.4
Open-Drain Driving
26.7
Push-Pull Driving
1.9
Open-Drain Driving
120
Push-Pull Driving
5.6
Open-Drain Driving
27.3
Push-Pull Driving
1.7
Open-Drain Driving
126
UNITS
B
ns
tPLH
tPHL
B
A
ns
tPLH
tEN (tPZH & tPZL)
OE
A or B
10
tDIS (tPHZ & tPLZ)
OE
A or B
636
ns
trA
trB
tfA
tfB
tsk(0)
Push-Pull Driving
1.8
Open-Drain Driving
79
Push-Pull Driving
2.2
Open-Drain Driving
73
Push-Pull Driving
8.7
Open-Drain Driving
2.7
Push-Pull Driving
8.6
Open-Drain Driving
2.4
A Port Rise Time
ns
B Port Rise Time
ns
A Port Fall Time
ns
B Port Fall Time
ns
Channel-to-Channel Skew
0.5
Push-Pull Driving
24
Open-Drain Driving
2
ns
Data Rate
Mbps
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
APPLICATION INFORMATION
The BCT0102 can be used to bridge the digital-switching compatibility gap between two voltage nodes
to successfully interface logic threshold levels found in electronic systems. It should be used in a
point-to-point topology for interfacing devices or systems operating at different interface voltages with one
another. Its primary target application use is for interfacing with open-drain drivers on the data I/Os such
as I2C or 1-wire, where the data is bidirectional and no control signal is available. The BCT0102 can also
be used in applications where a push-pull driver is connected to the data I/Os
Block Diagram
The BCT0102 architecture (see Figure 1) is an auto-direction-sensing based translator that does not
require a direction-control signal to control the direction of data flow from A to B or from B to A.
These two bidirectional channels independently determine the direction of data flow without a
direction-control signal. Each I/O pin can be automatically reconfigured as either an input or an output,
which is how this auto-direction feature is realized.
VCCA
VCCB
T1
R1
10KΩ
One
shot
One
shot
T2
Gate Bias
R2
10KΩ
B
A
N
Figure 1 Block Diagram of BCT0102 I/O Cell
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
The BCT0102 employs two key circuits to enable this voltage translation: An N-channel pass-gate
transistor topology that ties the A port to the B port. Output one-shot (O.S.) edge-rate accelerator circuitry
to detect and accelerate rising edges on the A or B ports.
Input Driver Requirements
The fall time (tfA, tfB) of a signal depends on the output impedance of the external device
driving the data I/Os of the BCT0102. Similarly, the tPHL and data rates also depend on the output
impedance of the external driver. The values for tfA, tfB, tPHL, and data rates in the datasheet
assume that the output impedance of the external driver is less than 50Ω.
Power Up
During operation, ensure that V CCA ≤ VCCB at all times. The sequencing of each power supply
will not damage the device during the power up operation, so either power supply can be ramped
up first.
Output Load Considerations
We recommend careful PCB layout practices with short PCB trace lengths to avoid
excessive capacitive loading and to ensure that proper O.S. triggering takes place. PCB signal
trace-lengths should be kept short enough such that the round trip delay of any reflection is less
than the one-shot duration. This improves signal integrity by ensuring that any reflection sees a
low impedance at the driver. The O.S. circuits have been designed to stay on for approximately
30ns. The maximum capacitance of the lumped load that can be driven also depends directly on
the one-shot duration. With very heavy capacitive loads, the one-shot can time-out before the
signal is driven fully to the positive rail. The O.S. duration has been set to best optimize trade-offs
between dynamic ICC, load driving capability, and maximum bit-rate considerations. Both PCB
trace length and connectors add to the capacitance that the BCT0102 output sees, so it is
recommended that this lumped-load capacitance be considered to avoid O.S. retriggering, bus
contention, output signal oscillations, or other adverse system-level affects.
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
Enable and Disable
The BCT0102 has an OE input that is used to disable the device by setting OE low, which places all I/Os in
the Hi-Z state. OE has an internal pull-down current source, as long as VCCA is powered. The disable time (tDIS)
indicates the delay between the time when OE goes low and when the outputs are disabled (Hi-Z). The enable
time (tEN) indicates the amount of time the user must allow for the one-shot circuitry to become operational
after OE is taken high.
Pull-up or Pull-down Resistors on I/O Lines
Each A port I/O has an internal 10kΩ pull-up resistor to VCCA, and each B port I/O has an internal 10kΩ
pull-up resistor to VCCB. If a smaller value of pull-up resistor is required, an external resistor must be added from
the I/O to VCCA or VCCB (in parallel with the internal 10kΩ resistors). Adding lower value pull-up resistors will effect
VOL levels, however. The internal pull-ups of the BCT0102 are disabled when the OE pin is low.
Typical Application Circuit
Figure 2 Typical Application Circuit
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
Test Circuits
Figure 3 Load Circuits and Voltage Waveforms
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
PACKAGE OUTLINE DIMENSIONS
TSOT23-8
Outline Drawing
REV2.4
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BCT0102
2-Bit Bidirectional
Voltage-Level Translator
XTDFN1.4X1.0-8L
Outline Drawing
REV2.4
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16
BCT0102
2-Bit Bidirectional
Voltage-Level Translator
QFN1.4X1.2-8L
Outline Drawing
REV2.4
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