RS245

Octal Bus Transceiver with 3-State Outputs
1 FEATURES

3 DESCRIPTIONSPower-Supply Range:1.65V to 5.5V

The RS245 is designed for asynchronous communication

VCC Isolation: If VCC is at GND, Both Ports
are in the High-Impedance Statebetween two data buses. The logic levels of the directioncontrol (DIR) input and the output-enable ( ̅̅̅̅OE ) input

IOFF: Supports Partial-Power-Down Mode

activate either the B-port outputs or the A-port outputs orOperation

place both output ports into the high-impedance mode. The

Extended Temperature: -40°C to +125°Cdevice transmits data from the A bus to the B bus when the

B-port outputs are activated, and from the B bus to the Abus when the A-port outputs are activated. The input

2 APPLICATIONS

Handset

Smartphone

Tablet

Desktop PC

circuitry on both A and B ports is always active and musthave a logic HIGH or LOW level applied to prevent excess
ICC and ICCZ.
This device is fully specified for partial-power-down
applications using IOFF. The IOFF circuitry disables theoutputs, preventing damaging current backflow through thedevice when it is powered down.
The VCC isolation feature ensures that if either VCC input isat GND, all outputs are in the high-impedance state.
To ensure the high-impedance state during power up or̅̅̅̅ should be tied to VCC through a pullup
power down, OE
resistor, the minimum value of the resistor is determined by
the current-sinking capability of the driver.
It operates over an ambient temperature range of -40°C to+125°C.

Device Information (1)PART NUMBERRS245(1)REV A.4

PACKAGEBODY SIZE (NOM)

TSSOP206.50mm×4.40mm

SOP20

12.80mm×7.50mm

For all available packages, see the orderable addendum at the end ofthe data sheet.

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RS245
4 Functional Block Diagram
DIR

A0119OE

218B0

A1 317B1A2 416B2A3 515 B3
A4 614 B4A5 713 B5A6 812 B6

A7 911 B7Function Table
CONTROL INPUTSOUTPUT CIRCUITSOPERATION

̅̅̅̅𝐎𝐄DIR

A PORT

B PORTLLEnabled

Hi-Z

B data to A bus

LH

Hi-Z

EnabledA data to B bus

HXHi-Z

Hi-ZIsolationNOTE:
H=HIGH voltage level
L=LOW voltage level
X=don’t care
Z=high impedance OFF-state

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RS245
Table of Contents
1 FEATURES ............................................................................................................................................................................... 1
2 APPLICATIONS ...................................................................................................................................................................... 1
3 DESCRIPTIONS ...................................................................................................................................................................... 1
4 Functional Block Diagram .................................................................................................................................................... 25 Revision History ..................................................................................................................................................................... 4
6 PACKAGE/ORDERING INFORMATION (1) ..................................................................................................................... 57 PIN CONFIGURATIONS ...................................................................................................................................................... 6
8 SPECIFICATIONS ................................................................................................................................................................... 7
8.1 Absolute Maximum Ratings .......................................................................................................................................... 7
8.2 ESD Ratings ...................................................................................................................................................................... 7
8.3 Recommended Operating Conditions ......................................................................................................................... 8
8.4 Electrical Characteristics ................................................................................................................................................ 9
8.5 Switching Characteristics.............................................................................................................................................108.6 Operating Characteristics ............................................................................................................................................108.7 Typical Characteristics .................................................................................................................................................109 Parameter Measurement Information ............................................................................................................................1110 Application Information ...................................................................................................................................................1211 PACKAGE OUTLINE DIMENSIONS .............................................................................................................................1312 TAPE AND REEL INFORMATION .................................................................................................................................153 / 16

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RS2455 Revision History
Note: Page numbers for previous revisions may different from page numbers in the current version.
VERSION

Change Date

Change Item

A.1

2021/02/26

A.2

2021/08/18

A.3

2023/09/06

A.3.1

2024/02/26

Initial version completed
1.Fix Switching Characteristics mistake in Page 9、10@A.1 Version.
2.Fix Application Information mistake in Page 13@A.1 Version.
1. Update ESD Ratings on Page5@RevA.2
2. Add Package thermal impedance on Page5@RevA.2
3. Update PACKAGE OUTLINE DIMENSIONS
Modify packaging naming

A.4

2024/05/17

Update KEY PARAMETER LIST OF TAPE AND REEL

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RS245
6 PACKAGE/ORDERING INFORMATION (1)PRODUCT
RS245

ORDERING
NUMBER
RS245YTSS20

TEMPERATURE
RANGE-40°C ~+125°C

PACKAGELEADTSSOP20

PACKAGEMARKING (2)RS245

RS245YS20-40°C ~+125°C

SOP20

RS245

MSL(3)

PACKAGE OPTIONMSL3Tape and Reel,4000

MSL3Tape and Reel,1500

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.

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RS245
7 PIN CONFIGURATIONS(TOP VIEW)
DIR

120A0219 OE

A1318B0A2417B1A3516B2A4615B3A5714B4A6813B5A7912B6GND

1011B7VCCTSSOP20/SOP20PIN DESCRIPTION
PIN

NAME

TYPE (1)

2

A0

I/O

Input/output

3

A1

I/O

Input/output

4

A2

I/O

Input/output

5

A3

I/O

Input/output

6

A4

I/O

Input/output

7

A5

I/O

Input/output

8

A6

I/O

Input/output

9

A7I/O

Input/output

11

B7I/O

Input/output

12B6I/O

Input/output

13

B5

I/O

Input/output

14

B4

I/O

Input/output

15

B3

I/O

Input/output

16

B2

I/O

Input/output

17

B1

I/O

Input/output

18

B0

I/O

Input/output

1

DIR

I

direction control

10

GND

G19

̅̅̅̅
OE

I

20

VCC

P

Ground.
Output Enable (Active Low). Pull ̅̅̅̅OE high to place all outputs in 3state mode.
supply voltage. 1.65V≤VCC≤5.5V

TSSOP20/SOP20(1)FUNCTION

I=input, O=output, I/O=input and output, P=power

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RS2458 SPECIFICATIONS8.1 Absolute Maximum Ratings
Over operating free-air temperature range (unless otherwise noted) (1)SYMBOLVCCVI(2)

PARAMETERMINMAXUNIT

-0.5

6.5

VA port-0.5

6.5

B port-0.5

6.5

Control inputs

-0.5

6.5

Supply Voltage Range
Input Voltage Range

VO(2)Voltage range applied to any output in the highimpedance or power-off state

A port-0.5

6.5

B port-0.5

6.5

VO(2)(3)Voltage range applied to any output in the high orlow state

A port-0.5

VCC+0.5

B port-0.5

VCC+0.5VVVIIKInput clamp current

VI<0-50mAIOKOutput clamp current

Vo<0-50mAIO

Continuous output current±50mA±100mA

Continuous current through VCC or GND
TSSOP2040

SOP2040

θJAPackage thermal impedance (4)TJ

Junction Temperature (5)-40150Tstg

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 VCC 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), MIL-STD-883K METHOD 3015.9±1000

V

Charged-Device Model (CDM), ANSI/ESDA/JEDEC JS-002-2018±1500

VMachine Model (MM), JESD22-A115±200

V

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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RS245
8.3 Recommended Operating Conditions
VCC is the supply voltage associated with the input port and output port.(1)(2)
PARAMETER
Supply voltage
High-level input
Voltage (VIH)

Low-level input
Voltage (VIL)

VCC

MIN

1.65V to 1.95V

VCC x0.65

2.3V to 2.7V

1.7

3V to 3.6V

24.5V to 5.5V

VCC x0.7

VCC

Inputs (3)Inputs (3)

1.65

TYP

MAXUNIT

5.5VV

1.65V to 1.95V

VCCx0.35

2.3V to 2.7V

0.7

3V to 3.6V

0.8

4.5V to 5.5V

VCCx0.3

V

Input voltage (VI)

Input voltage

0

5.5

V

Input/output voltage(VI/O)

Active state

0

VCC

V

3-state0

5.5

VHigh-level output current (IOH)

Low-level output current (IOL)

Input transition riseor fall rate(Δt/Δv)

Data inputs

1.65V to 1.95V-4

2.3V to 2.7V-8

3V to 3.6V-244.5V to 5.5V-32

1.65V to 1.95V

4

2.3V to 2.7V

8

3V to 3.6V24

4.5V to 5.5V32

1.65V to 1.95V

20

2.3V to 2.7V

20

3V to 3.6V

10

4.5V to 5.5V

5

TA Operating free-air temperature-40

125mAmA

ns/V°C(1) All unused or driven (floating) data inputs (I/Os) of the device must be held at logic HIGH or LOW (preferably V CC or GND) to ensure
proper device operation and minimize power.
(2) All unused control inputs must be held at VCC or GND to ensure proper device operation and minimize power consumption.
(3) For VCC values not specified in the data sheet, VIH min = VCC × 0.7 V, VIL max = VCC × 0.3 V.

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RS245
8.4 Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER

VOH

VOL

CONDITIONSVCCIOH = –100 µ A VI =VIH

VCC -0.1

1.65V

1.2

IOH = –8mA

VI =VIH

2.3V

1.9

IOH = –24mA

VI =VIH

3V

2.4

IOH = –32mA

VI =VIH

4.5V

IOL = 100 µ A

VI =VIL

1.65V to 4.5V

IOL = 4mA

VI =VIL

1.65V

0.45

IOL = 8mA

VI =VIL

2.3V

0.3

IOL = 24mA

VI =VIL

3V

0.55

IOL = 32mA

VI =VIL

4.5V
1.65V to 5.5V

Ioff

A or B Port

VI or VO= 0 to 5.5V

0V

IOZ (3)A or B PortVO = VCC or GND,
̅̅̅̅=VIH
OE

ICC

VCC supplycurrent

VI = VCC or GND (4)IO = 0DIR
CI
CIO

Controlinputs

MAX(1)

1.65V to 4.5V

VI = VCC or GND

B portTYP(2)

VI =VIH

DIR

ΔICC

MIN(1)

IOH = –4mA

IIA port

TEMP

One A port at VCC –0.6 V, DIR at VCC,
B port = open
One B port at VCC –0.6 V, DIR at GND,
A port = open
DIR at VCC – 0.6 V,
B port = open
A port at VCC or GND

1.65V to 5.5V
1.65V to 5.5V
0V

3V to 5.5V

Full

UNIT

V

3.8
0.1
V

0.55+25C±1

Full±2+25C±1+25C±1

Full±2+25C

1

Full

5

Full-2

Full50µA

Full50µA

Full50µA

VI = VCC or GND

3.3V+25C4A port

3.3V+25C8.5B port

3.3V+25C

8.5

µA
µA
µA

µA

pFpF

(1) Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlations using statisticalquality control (SQC) method.
(2) 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.
(3) For I/O ports, the parameter IOZ includes the input leakage current.
(4) Hold all unused data inputs of the device at VCCI or GND to assure proper device operation.

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RS245
8.5 Switching Characteristics
PARAMETER
tPLH
tPHL
tPLH
tPHL
tPHZ
tPLZ
tPHZ
tPLZ
tPZH
tPZL
tPZH
tPZL

FROM
(INPUT)TO(OUTPUT)An

VCC=1.8V±0.15V

VCC=2.5V±0.2V

VCC=3.3V±0.3V

VCC=5V
±0.5V

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

MIN

MAX

Bn

1.7

21.6

1.3

9.1

1.0

7.4

0.8

7.1

ns

Bn

An

0.9

23.5

0.8

23.6

0.7

23.3

0.7

23.3

ns̅̅̅̅OE

An

1.5

29.5

1.5

29.4

1.5

29.3

1.4

29.1

ns̅̅̅̅
OE

Bn

2.4

32.2

1.9

12.9

1.7

12.0

1.3

10.2

ns̅̅̅̅
OE

An

0.4

23.8

0.4

23.7

0.4

23.7

0.4

23.7

ns̅̅̅̅
OE

Bn

1.8

31.9

1.5

16

1.2

12.6

0.9

10.8

ns

8.6 Operating Characteristics
TA=25°C
PARAMETER
A-port input, B-port output

Cpd (1)(1)

B-port input, A-port output

TEST
CONDITIONSVCC=1.8V

VCC=2.5V

VCC=3.3V

VCC=5V

TYP

TYP

TYP

TYP

CL=0,
f=10MHz,
tr=tf=1ns222342424344UNITpF

Power dissipation capacitance per transceiver.

8.7 Typical Characteristics
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.
At TA = +25°C, VCC=5V, unless otherwise noted.
2.5

5.2

24.8

5VOH Voltage(V)VOL Voltage(V)

4.6
1.5
125°C
125°C
-40°C

0.5
0020406080

4.4
4.2
43.8

3.625°C
125°C
-40°C

3.4
3.2
3100

020406080100

IOH Current(mA)

IOL Current(mA)

Figure 1. Voltage vs Current

Figure 2. Voltage vs Current

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RS2459 Parameter Measurement Information
RL

From Output
Under Test

VLOAD

S1Open
GND

CL

RL

TEST

S1tpd

Open

tPLZ/tPZL

VLOAD

tPHZ/tPZH

GND

LOAD CIRCUIT

VCC

VI

VM

CL

RL

VTP

1.8V±0.15V

VCC

VCC/215pF

2kΩ

0.15V

2.5V±0.2V

VCC

VCC/215pF

2kΩ

0.15V

3.3V±0.3V

2.7V

1.5V

15pF

2kΩ

0.3V

5V±0.5V

2.7V

1.5V

15pF

2kΩ

0.3V

twVIInput

VM

VM
0V

VM

VI

VM

0V
tPLH
Output

tPHL
VM

VM

VM
0V

tPZL

VOLTAGE WAVEFORMSPULSE DURA TION
Input

VI

OutputControl(low-levelenabling )VM

VOHVOL

OutputWaveform 1
S1 at 2 X VLO AD(see Note B)

OutputWaveform 2
S1 at GND
(see Note B)

VOLTAGE WAVEFORMS
PROPAGA TION DELAY TIMES

tPLZ
VI

VM

VOL + VTP

tPZH

VOL

tPHZ

VM

VOH

VTP

VOH
0V

VOLTAGE WAVEFORMSENABLE AND DISABLE TIMESNOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR≤10 MHz, ZO = 50Ω, dv/dt≥1V/ns.
D. The outputs are measured one at a time, with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
H. All parameters and waveforms are not applicable to all devices.

Figure 3. Load Circuit and Voltage Waveforms

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RS24510 Application Information
RS245 is a high drive CMOS device that can be used for a multitude of bus interface type applications whereoutput drive or PCB trace length is a concern. The inputs can accept voltages to 5.5 V at any valid VCC making it
ideal for down translation.
Regulated 1.65 V to 5.5V

RS245uC
System LogicLEDs/Relays

OEVcc
DIRA0

B0A7

B7uCSystem Logic
LEDs/Relays

GND

Figure 4. Typical Application Schematic

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RS245
11 PACKAGE OUTLINE DIMENSIONSTSSOP20 (4)
eb

5.6
E1 E

1.55

0.65

0.25

RECOMMENDED LAND PATTERN (Unit: mm)

DA2

A

H

c

A3

θ

L

A1

L1

SymbolDimensions In Millimeters

Dimensions In Inches

MinMin

Max

A (1)

Max

1.200

0.047

A10.050

0.150

0.002

0.006

A20.800

1.050

0.031

0.041

A30.390

0.490

0.015

0.020

b0.200

0.290

0.008

0.011

c0.130

0.170

0.005

0.007

D (1)

6.400

6.600

0.252

0.260

E (1)

4.300

4.500

0.169

0.177

E1

6.200

6.600

0.244

0.260

0.650(BSC) (2)

eL

0.450

Hθ
L1

0.026(BSC) (2)
0.750

0.018

0.250(TYP)
0°

0.030
0.010(TYP)

8°
1.00(REF) (3)0°8°0.039(REF) (3)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. REF is the abbreviation for Reference.
4. This drawing is subject to change without notice.

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SOP20 (4)
eb

9.3

E E12

1.27

0.6

RECOMMENDED LAND PATTERN (Unit: mm)

DA3

A2 A

A1Hc
θ

L
L1Symbol

Dimensions In Millimeters
MinMaxA (1)Dimensions In Inches
MinMax

2.650

0.104

A1

0.100

0.300

0.004

0.012

A2

2.250

2.350

0.089

0.093

A3

0.970

1.070

0.038

0.042

b0.390

0.470

0.015

0.019

c

0.250

0.290

0.010

0.011

D (1)

12.70012.900

0.500

0.508

E

10.10010.500

0.398

0.413

E1 (1)

7.400

7.600

0.291

0.299

eL

1.270(BSC) (2)
0.700

Hθ
L1

0.050(BSC) (2)
1.000

0.028

0.250(TYP)
0°

0.039
0.010(TYP)

8°

1.400(REF) (3)0°

8°0.055(REF) (3)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. REF is the abbreviation for Reference.
4. This drawing is subject to change without notice.

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RS245
12 TAPE AND REEL INFORMATIONREEL DIMENSIONSTAPE DIMENSION

ReelDiameter

Reel Width(W1)

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

KEY PARAMETER LIST OF TAPE AND REELTSSOP20

Reel
Diameter
13’’

Reel Width(mm)12.4

A0(mm)
6.75

B0(mm)
6.95

K0(mm)
1.20

P0(mm)
4.0

P1(mm)
8.0

P2(mm)
2.0

W(mm)
16.0

Pin1
Quadrant
Q1

SOP20

13’’

24.4

10.75

13.55

2.65

4.0

12.0

2.0

24.0

Q1

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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RS245IMPORTANT NOTICE AND DISCLAIMER
Jiangsu RUNIC Technology Co., Ltd. will accurately and reliably provide technical and reliability data (includingdata 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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