RS1T34

1-Bit Dual-Supply Unidirectional Bus Transceiver
1 FEATURES•

3 DESCRIPTIONSPower-Supply Range:
VCCA and VCCB: 1.65V to 5.5V•

VCC Isolation: If Either VCC is at GND, Both
Ports are in the High-Impedance State•

Low power consumption, 4μA Max•

Output drive up to ±24mA@3.0V•

No Power-Supply Sequencing Required:
Either VCCA or VCCB can be Ramped First•

IOFF: Supports Partial-Power-Down Mode•

Extended Temperature: -40°C to +125°C

Operation

Industrial•

Enterprise•

Telecom, such as VOIP•

Personal electronic

The RS1T34 is designed for asynchronous communication
between two data buses. The A bus is input side, the B bus
is output side.
The RS1T34 is fully specified for partial power-down
applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device
when it is powered down.

2 APPLICATIONS•The RS1T34 is 1-bit non-inverting bus transceiver uses two
separate configurable power supply rails. The A port isdesigned to track VCCA, which supporting operating voltages
from 1.65V to 5.5V, and the B port supporting operating
voltages from 1.65V to 5.5V while it tracks the VCCB
supply. This allows for universal low-voltage unidirectionaltranslation between any of the 1.8V, 2.5V, 3.3V and 5V
voltage nodes.

The RS1T34 is available in Green SOT23-5 and SC70-5
packages. It operates over an ambient temperature rangeof -40°C to +125°C.

Device Information (1)PART NUMBER

PACKAGEBODY SIZE (NOM)

SOT23-5

2.92mm×1.60mm

SC70-52.10mm×1.25mm

RS1T34(1) For all available packages, see the orderable addendum at the endof the data sheet.

4 Functional Block Diagram

A

B

VCCB

VCCA

REV A.3

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RS1T34
Table of Contents
1 FEATURES ............................................................................................................................................................................... 1
2 APPLICATIONS ...................................................................................................................................................................... 1
3 DESCRIPTIONS ...................................................................................................................................................................... 1
4 Functional Block Diagram .................................................................................................................................................... 1
5 Revision History ..................................................................................................................................................................... 3
6 PACKAGE/ORDERING INFORMATION (1) ..................................................................................................................... 4
7 PIN CONFIGURATIONS ...................................................................................................................................................... 5
7.1 PIN DESCRIPTION.......................................................................................................................................................... 5
7.2 Function Table (2) ............................................................................................................................................................. 5
8 SPECIFICATIONS ................................................................................................................................................................... 6
8.1 Absolute Maximum Ratings .......................................................................................................................................... 6
8.2 ESD Ratings ...................................................................................................................................................................... 6
8.3 Recommended Operating Conditions ......................................................................................................................... 7
8.4 Electrical Characteristics ................................................................................................................................................ 8
8.5 Timing Requirements ...................................................................................................................................................... 9
8.5.1 VCCA=1.8V± 0.15 V .................................................................................................................................................. 9
8.5.2 VCCA=2.5V± 0.2 V .................................................................................................................................................... 9
8.5.3 VCCA=3.3V± 0.3 V .................................................................................................................................................... 9
8.5.4 VCCA=5V± 0.5 V ........................................................................................................................................................ 9
8.6 Operating Characteristics .............................................................................................................................................. 9
8.7 Typical Characteristics .................................................................................................................................................10
9 Parameter Measurement Information ............................................................................................................................11
10 Application Information ...................................................................................................................................................12
11 PACKAGE OUTLINE DIMENSIONS .............................................................................................................................13
12 TAPE AND REEL INFORMATION .................................................................................................................................15

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RS1T34
5 Revision History
Note: Page numbers for previous revisions may different from page numbers in the current version.
VERSION

Change Date

Change Item

A.1

2021/09/29

A.2

2022/12/14

A.2.1

2024/02/23

Initial version completed
1. Update PACKAGE MARKING on Page 5@RevA.1
2. Update ESD Ratings on Page 4@RevA.1
3. Changed Recommended Operating Conditions and Timing Requirements andOperating Characteristics
Modify packaging naming

A.3

2024/04/01

Update PACKAGE note

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RS1T34
6 PACKAGE/ORDERING INFORMATION (1)PRODUCT
RS1T34ORDERING
NUMBER
RS1T34XF5
RS1T34XC5TEMPERATURE
RANGE-40°C ~+125°C

PACKAGELEAD
SOT23-5

PACKAGEMARKING (2)
1T34-40°C ~+125°C

SC70-5 (4)1T34

MSL (3)

PACKAGE OPTIONMSL3Tape and Reel, 3000

MSL3

Tape and Reel, 3000

NOTE:
(1) This information is the most current data available for the designated devices. This data is subject to change without notice and revisionof this document. For browser-based versions of this data sheet, refer to the right-hand navigation.
(2) There may be additional marking, which relates to the lot trace code information (data code and vendor code), the logo or theenvironmental category on the device.
(3) MSL, The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications.
(4) Equivalent to SOT353.

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RS1T34
7 PIN CONFIGURATIONSTOP VIEW
VCCA

1

A

2

GND

3

5

VCCB

4

B

SOT23-5/SC70-5

7.1 PIN DESCRIPTION
PIN

(1)

(1)

NAME

TYPE

1

VCCA

P

A Port Supply Voltage.1.65V ≤ VCCA ≤ 5.5V

2

A

I

Input A. Reference to VCCA.

3

GND

‒

Ground.

4

B

O

Output B. Reference to VCCB.

5

VCCB

P

B Port Supply Voltage.1.65V ≤ VCCB ≤ 5.5V.

SOT23-5/SC70-5

FUNCTION

I=input, O=output, P=power.

7.2 Function Table (2)INPUT (1)OUTPUT

A PORT (3)B PORT (3)

H

H

L

L

Note:
(1) The input circuit of the data I/O is always active.
(2) When either VCCA or VCCB is at GND level, the device goes into suspend mode.
(3) H=High voltage level, L=Low voltage level.

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RS1T348 SPECIFICATIONS
8.1 Absolute Maximum Ratings
Over operating free-air temperature range (unless otherwise noted) (1)SYMBOLPARAMETER

MIN

MAX

UNIT

Supply Voltage Range

-0.5

6.5

V

Supply Voltage Range

-0.5

6.5

V

A port

-0.5

6.5

V

B port-0.5

VCCB+0.5

V

VI<0

-50

mA

Vo<0

-50

mA

Continuous output current

±50

mA

Continuous current through VCCA, VCCB or GND

±100

mA

(3)

VCCB (3)
VI (2)

IIK

Input Voltage Range
Voltage range applied to any output in the highimpedance or power-off state
Input clamp current

IOK

Output clamp current

IO

VCCA

VO (2)

SOT23-5230

SC70-5376

θJA

Package thermal impedance (4)TJ

Junction temperature (5)

-40

150

Tstg

Storage temperature

-65

+150

°C/W
°C

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only,
which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated 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.
(4) The package thermal impedance is calculated in accordance with JESD-51.
(5) The maximum power dissipation is a function of TJ(MAX), RθJA, and TA. The maximum allowable power dissipation at any ambient
temperature is PD = (T J(MAX) - TA) / RθJA. All numbers apply for packages soldered directly onto a PCB.

8.2 ESD Ratings
The following ESD information is provided for handling of ESD-sensitive devices in an ESD protected area only.

V(ESD)

Electrostatic discharge

VALUE

UNIT

Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)

±2000

V

Charged-device model (CDM), per ANSI/ESDA/JEDEC JS-002 (2)

±1500

V

Machine Model (MM)

±200

V

(1) JEDEC document JEP155 states that 500 V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250 V CDM allows safe manufacturing with a standard ESD control process.

ESD SENSITIVITY CAUTION
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric changes could cause the device not to meet its publishedspecifications.

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RS1T34
8.3 Recommended Operating Conditions
VCCA is the supply voltage associated with the input port. VCCB is the supply voltage associated with the output port.
PARAMETER
Supply voltage (1)High-level input
Voltage

Low-level input
Voltage

VCCA (1)

MIN

TYP

MAX

VCCA

1.65

5.5

VCCB

1.65

5.5

VIH (4)

VIL (4)

Input voltage

VI

Output voltage

VO

1.65V to 1.95V

VCCA x 0.75

2.3V to 2.7V

VCCA x 0.7

3V to 3.6V

VCCA x 0.7

4.5V to 5.5V

VCCA x 0.7
VCCA x 0.35

2.3V to 2.7V

VCCA x 0.3

3V to 3.6V

VCCA x 0.3

4.5V to 5.5V

VCCA x 0.3

Low-level output current (IOL)

Data inputs (3)

UNIT
V

V

1.65V to 1.95V

High-level output current (IOH)

Input transition
rise or fallrate(Δt/Δv)

VCCB (2)

V

0

5.5

V

0

VCCB

V

1.65V to 1.95V-4

2.3V to 2.7V

-8

3V to 3.6V

-24

4.5V to 5.5V

-32

1.65V to 1.95V

4

2.3V to 2.7V

8

3V to 3.6V

24

4.5V to 5.5V

32

1.65V to 1.95V

20

2.3V to 2.7V

20

3V to 3.6V

10

4.5V to 5.5V

mA

mA

ns/V

5

TA Operating free-air temperature

-40

125

°C

(1) VCCA is the VCC associated with the data input port.
(2) VCCB is the VCC associated with the output port.
(3) All unused or driven (floating) data inputs (I/Os) of the device must be held at logic HIGH or LOW (preferably V CCI or GND) to ensure
proper device operation and minimize power.
(4) For VCCA values not specified in the data sheet, VIH min = VCCA × 0.7 V, VIL max = VCCA × 0.3 V.

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RS1T34
8.4 Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted) (1) (2)PARAMETER

VOH

VOL

II

Ioff

Input
leakagecurrent

A or B Port

CONDITIONS

VCCA

VCCB

IOH = –100µ A VI=VIH

1.65V to 4.5V

1.65V to 4.5V

IOH = –4mA

VI =VIH

1.65V

1.65V

IOH = –8mA

VI =VIH

2.3V

2.3V

1.9

IOH = –24mA VI =VIH

3V

3V

2.4

4.5V

4.5V

1.65V to 4.5V

1.65V to 4.5V

0.1
0.45

3.8

IOL = 4mA

VI =VIL

1.65V

1.65V

IOL = 8mA

VI =VIL

2.3V

2.3V

0.3

IOL = 24mA

VI =VIL

3V

3V

0.55

IOL = 32mA

VI =VIL

4.5V

4.5V

0.55

1.65V to 5.5V

1.65V to 5.5V

0V

0V to 5.5V

0V to 5.5V

0V

1.65V to 5.5V
5V

V

+25C

±1

Full

±2

+25C

±1

Full

±2

+25C

±1

Full

±2

1.65V to 5.5V

Full

3

0V

Full

2

0V

5V

Full

-2

1.65V to 5.5V

1.65V to 5.5V

Full

3

5V

0V

Full

-2

0V

5V

Full

2

1.65V to 5.5V

1.65V to 5.5V

Full

4

µA

3V to 5.5V

3V to 5.5V

Full

50

µA

3V to 5.5V

3V to 5.5V

Full

50

µA

VI= GND or VCCA

0V to 3.6V

0V to 3.6V

+25C

8.5

pF

VO=GND

0V to 3.6V

0V to 3.6V

+25C

8.5

pF

VI = VCCA or GND

VI or VO= 0 to 5.5V

VCCB supply
current

VI = VCCA or GND (5)IO = 0

ICCA
+
ICCB

Combined
supplycurrent

VI = VCCA or GND
IO = 0ΔICCA

A port

ΔICCB

B port

CIO

Full

UNIT

V

IOL = 100µ A VI =VIL

ICCB

Input
capacitance
OutputcapacitanceTYP(4) MAX(3)IOH = –32mA VI =VIH

VI = VCCA or GND (5)IO = 0CI

MIN(3)VCCB 0.1
1.2

VCCA supply
current

ICCA

TEMP

One A port at VCCA –0.6 V, B port = open
One B port at VCCB –0.6 V, A port = open

µA
µA
µA

µA

µA

(1) VCCA is the VCC associated with the input port.
(2) VCCB is the VCC associated with the output port.
(3) Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlations using statisticalquality control (SQC) method.
(4) Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may varyover time and will also depend on the application and configuration.
(5) Hold all unused data inputs of the device at VCCI or GND to assure proper device operation.

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RS1T34
8.5 Timing Requirements
8.5.1 VCCA=1.8V± 0.15 V

over recommended operating free-air temperature range, Full=-40°C to 125°C.
VCCB=1.8V
VCCB=2.5V
FROM
TO±0.15V (1)±0.2V (1)
PARAMETERTEMP(INPUT) (OUTPUT)MIN MAX MIN MAX
tPLH
tPHL

A

B

Full

VCCB=3.3V±0.3V (1)VCCB=5V±0.5V (1)

MIN

MAX

MIN

MAX

3.5

24.6

2.6

17.2

2

18.6

1.6

18.5

3.3

18.4

2.6

15.5

2.1

16.4

2

16.8

UNIT

ns

(1) This parameter is ensured by design and/or characterization and is not tested in production.

8.5.2 VCCA=2.5V± 0.2 V

over recommended operating free-air temperature range, Full=-40°C to 125°C.
VCCB=1.8V
VCCB=2.5V
(1)
FROM
TO
±0.15V±0.2V (1)
PARAMETERTEMP(INPUT) (OUTPUT)MIN MAX MIN MAX
tPLH
tPHL

A

B

Full

VCCB=3.3V±0.3V (1)VCCB=5V±0.5V (1)

MIN

MAX

MIN

MAX

2.7

24.5

1.8

16.5

1.5

15.4

1.3

16.6

2.5

18.4

1.6

12.7

1.5

11.3

1

10.4

UNIT

ns

(1) This parameter is ensured by design and/or characterization and is not tested in production.

8.5.3 VCCA=3.3V± 0.3 V

over recommended operating free-air temperature range, Full=-40°C to 125°C.
VCCB=1.8V
VCCB=2.5V
FROM
TO±0.15V (1)±0.2V (1)
PARAMETERTEMP(INPUT) (OUTPUT)MIN MAX MIN MAX
tPLH
tPHL

A

B

Full

VCCB=3.3V±0.3V (1)VCCB=5V±0.5V (1)

MIN

MAX

MIN

MAX

2.5

23.2

1.6

16.2

0.8

15.2

0.8

15.1

2.4

15.3

1.5

12.5

0.9

10.2

0.8

10

UNIT

ns

(1) This parameter is ensured by design and/or characterization and is not tested in production.

8.5.4 VCCA=5V± 0.5 V

over recommended operating free-air temperature range, Full=-40°C to 125°C.
VCCB=1.8V
VCCB=2.5V
FROM
TO±0.15V (1)±0.2V (1)
PARAMETERTEMP(INPUT) (OUTPUT)MIN MAX MIN MAX
tPLH
tPHL

A

B

Full

VCCB=3.3V±0.3V (1)VCCB=5V±0.5V (1)

MIN

MAX

MIN

MAX

2.2

23.2

1.2

16.2

0.7

15.8

0.6

15.2

2.1

14.1

1

11.4

0.8

10.4

0.6

9.5

UNIT

ns

(1) This parameter is ensured by design and/or characterization and is not tested in production.

8.6 Operating Characteristics
TA=25°C
PARAMETER (1)

(1)

CpdA

A-port input, B-port output

CpdB

A-port input, B-port output

CONDITIONS
CL=0,
f=10MHz,
tr=tf=5ns
CL=0,
f=10MHz,
tr=tf=5ns

VCCA=VCCB=1.8V

VCCA=VCCB=2.5V

VCCA=VCCB=3.3V

VCCA=VCCB
=5V

TYP

TYP

TYP

TYP

3

4

6

9

pF

14

16

21

32

pF

UNIT

Power dissipation capacitance per transceiver.

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RS1T34
8.7 Typical Characteristics
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0

VOH Voltage(V)VOL Voltage(V)NOTE: The graphs and tables provided following this note are a statistical summary based on a limited number of samples
and are provided for informational purposes only.

25°C
125°C
-40°C
0

20

40

60

IOL Current(mA)

80

5.2
5
4.8
4.6
4.4
4.2
4
3.8
3.6
3.4
3.2
3

25°C
125°C
-40°C
0

100

20

40

60

IOH Current(mA)

80

100

Figure 2. Voltage vs Current

Figure 1. Voltage vs Current

TA = 25°C, VCCA = 1.8 V

Figure 3. Typical Propagation Delay of High-toLow (A to B) vs Load CapacitanceTA = 25°C, VCCA = 2.5 V

Figure 4. Typical Propagation Delay High-to-Low(A to B) vs Load CapacitanceTA = 25°C, VCCA = 5 V

TA = 25°C, VCCA = 3.3 V

Figure 5. Typical Propagation Delay High-to-Low(A to B) vs Load Capacitance

Figure 6. Typical Propagation Delay High-to-Low(A to B) vs Load Capacitance

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RS1T34
9 Parameter Measurement Information
RL

From Output
Under Test

2xVcco

S1

Open
GND

CL

TEST

S1

tpd

Open

RL

LOAD CIRCUIT

VCC

CL

RL

VTP

1.8V±0.15V

15pF

2kΩ

0.15V

2.5V±0.2V

15pF

2kΩ

0.15V

3.3V±0.3V

15pF

2kΩ

0.3V

5V±0.5V

15pF

2kΩ

0.3V

Input

VCCA/2VCCA
VCCA/20V
tPLH

OutputtPHL
VOH

VCCB/2

VCCB/2VOL

VOLTAGE WAVEFORMS
PROPAGA TION DELAY TIMESNOTES: A. CL includes probe and jig capacitance.
B. All input pulses are supplied by generators having the following characteristics: PRR≤10 MHz, ZO = 50Ω, dv/dt≥1V/ns.
C. The outputs are measured one at a time, with one transition per measurement.
D. tPLH and tPHL are the same as tpd.
E. VCCA is the VCC associated with the input port.
F. All parameters and waveforms are not applicable to all devices.

Figure 7. Load Circuit and Voltage Waveforms

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RS1T34
10 Application Information
The RS1T34 can be used in level-translation applications for interfacing devices or systems operating at different
interface voltages with one another.

Figure 8. Typical Application Circuit

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RS1T34
11 PACKAGE OUTLINE DIMENSIONSSOT23-5 (3)
D

1.90

b

2.59

E1

E
0.99
0.69

0.95

e
e1

RECOMMENDED LAND PATTERN (Unit: mm)

0.2
A A2

c

θ
L

A1

Dimensions In Millimeters

Dimensions In Inches

Min

Max

Min

Max

A (1)

1.050

1.250

0.041

0.049

A1

0.000

0.100

0.000

0.004

A2

1.050

1.150

0.041

0.045

b

0.300

0.500

0.012

0.020

c

0.100

0.200

0.004

0.008

D (1)

2.820

3.020

0.111

0.119

E (1)

1.500

1.700

0.059

0.067

E1

2.650

2.950

0.104

0.116

Symbol0.950 (BSC) (2)e0.037 (BSC) (2)

e1

1.800

2.000

0.071

0.079

L

0.300

0.600

0.012

0.024

θ

0°

8°

0°

8°

NOTE:
1. Plastic or metal protrusions of 0.15mm maximum per side are not included.
2. BSC (Basic Spacing between Centers), "Basic" spacing is nominal.
3. This drawing is subject to change without notice.

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RS1T34
SC70-5 (3)
D

1.30
b

1.9

E1

E

0.75
0.65

0.4
Pin1
Index Areaee1

RECOMMENDED LAND PATTERN (Unit: mm)

0.2
A A2

c

θ

Symbol

L1

L

A1

Dimensions In Millimeters

Dimensions In Inches

Min

Max

Min

Max

A (1)

0.900

1.100

0.035

0.043

A1

0.000

0.100

0.000

0.004

A2

0.900

1.000

0.035

0.039

b

0.150

0.350

0.006

0.014

c

0.080

0.150

0.003

0.006

D (1)

2.000

2.200

0.079

0.087

E (1)

1.150

1.350

0.045

0.053

E1

2.150

2.450

0.085

(2)

e

0.650 (BSC)

e11.300 (BSC) (2)

L

0.260

L1
θ

0.026 (BSC)

0.051 (BSC) (2)
0.460

0.010

0.525
0°

0.096
(2)

0.018
0.021

8°

0°

8°

NOTE:
1. Plastic or metal protrusions of 0.15mm maximum per side are not included.
2. BSC (Basic Spacing between Centers), "Basic" spacing is nominal.
3. This drawing is subject to change without notice.

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RS1T34
12 TAPE AND REEL INFORMATIONREEL DIMENSIONSTAPE DIMENSION

Reel
DiameterReel Width(W1)

DIRECTION OF FEEDNOTE: The picture is only for reference. Please make the object as the standard.

KEY PARAMETER LIST OF TAPE AND REEL
SOT23-5

Reel
Diameter
7’’

Reel Width
(mm)
9.5

A0
(mm)
3.20

B0
(mm)
3.20

K0
(mm)
1.40

P0
(mm)
4.0

P1
(mm)
4.0

P2
(mm)
2.0

W
(mm)
8.0

Pin1
Quadrant
Q3

SC70-5

7’’

9.5

2.25

2.55

1.20

4.0

4.0

2.0

8.0

Q3

Package TypeNOTE:
1. All dimensions are nominal.
2. Plastic or metal protrusions of 0.15mm maximum per side are not included.

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RS1T34
IMPORTANT NOTICE AND DISCLAIMER
Jiangsu RUNIC Technology Co., Ltd. will accurately and reliably provide technical and reliability data (including
data sheets), design resources (including reference designs), application or other design advice, WEB tools, safety
information and other resources, without warranty of any defect, and will not make any express or implied
warranty, including but not limited to the warranty of merchantability Implied warranty that it is suitable for a
specific purpose or does not infringe the intellectual property rights of any third party.
These resources are intended for skilled developers designing with RUNIC products You will be solely
responsible for: (1) Selecting the appropriate products for your application; (2) Designing, validating and testing
your application; (3) Ensuring your application meets applicable standards and any other safety, security or otherrequirements; (4) RUNIC and the RUNIC logo are registered trademarks of RUNIC INCORPORATED. All
trademarks are the property of their respective owners; (5) For change details, review the revision history
included in any revised document. The resources are subject to change without notice. Our company will not beliable for the use of this product and the infringement of patents or third-party intellectual property rights due
to its use.

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