Texas Instruments TRS3318E Datasheet

1 2 3 4 5 6 7 8 9 10

20 19 18 17 16 15 14 13 12 11

READY

C1+

V+ C1− C2+ C2−

V−

DOUT2

RIN2

ROUT2

FORCEOFF V

GND DOUT1 RIN1 ROUT1 FORCEON DIN1 DIN2 INVALID

DB OR PW PACKAGE

(TOP VIEW)

TRS3318E

www.ti.com

2.5-V 460-kbps RS-232 TRANSCEIVER WITH ±15-kV ESD PROTECTION

Check for Samples: TRS3318E

FEATURES

• ESD Protection for RS-232 I/O Pins – ±15 kV (Human-Body Model) – ±8 kV (IEC 61000-4-2, Contact Discharge) – ±15 kV (IEC 61000-4-2, Air-Gap Discharge)

• 300-µA Operating Supply Current

• 1-µA Low-Power Standby Mode (With Receivers Active)

• Designed to Transmit at a Data Rate of 460 kbps

• Auto-Powerdown Plus Option Features Flexible Power-Saving Mode

• Operates From a Single 2.25-V to 3-V V Supply

• Designed to be Interchangeable With Industry Standard '3318 Devices

APPLICATIONS

• Battery-Powered Systems

• PDAs

• Cellular Phones

• Notebooks

• Hand-Held Equipment

• Pagers

SLLS805B –APRIL 2007–REVISED OCTOBER 2013

DESCRIPTION

The TRS3318E is a dual-driver, dual-receiver, RS232-compatible transceiver. The device features auto-powerdown plus and enhanced electrostatic discharge (ESD) protection integrated into the chip. Driver output and receiver input are protected to ±15 kV using the IEC 61000-4-2 Air-Gap Discharge method, ±8 kV using the IEC 61000-4-2 Contact Discharge method, and ±15 kV using the HumanBody Model (HBM).

The device operates at a data rate of 460 kbps. The transceiver has a proprietary low-dropout driver output stage, enabling RS-232-compatible operation from a 2.25-V to 3-V supply with a dual charge pump. The charge pump requires only four 0.1-µF capacitors and features a logic-level output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting.

The TRS3318E achieves a 1-µA supply current using the auto-powerdown feature. This device automatically enters a low-power power-down mode when the RS-232 cable is disconnected or the drivers of the connected peripherals are inactive for more than 30 s. The device turns on again when it senses a valid transition at any driver or receiver input. Autopowerdown saves power without changes to the existing BIOS or operating system.

This device is available in two space-saving packages: 20-pin SSOP and 20-pin TSSOP.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

TRS3318E

SLLS805B –APRIL 2007–REVISED OCTOBER 2013

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

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 published specifications.

www.ti.com

DETAILED DESCRIPTION

Flexible control options for power management are featured when the serial port and driver inputs are inactive. The auto-powerdown plus feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for approximately 30 s, the built-in charge pump and drivers are powered down, reducing the supply current to 1 µA. By disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown plus enabled, the device activates automatically when a valid signal is applied to any receiver or driver input. INVALID is high (valid data) if any receiver input voltage is greater than 2.7 V or less than –2.7 V, or has been between –0.3 V and 0.3 V for less than 30 µs (typical number). INVALID is low (invalid data) if all receiver input voltage are between –0.3 V and 0.3 V for more than 30 µs (typical number).

FUNCTION TABLE

INPUT CONDITIONS OUTPUT STATES

RECEIVER

FORCEON FORCEOFF LEVEL DRIVER RECEIVER INVALID READY

H H No No Active Active L H auto-powerdown

H H No Yes Active Active H H auto-powerdown

L H Yes No Active Active L H auto-powerdown

L H Yes Yes Active Active H H auto-powerdown

L H No No Z Active L L auto-powerdown

L H No Yes Z Active H L auto-powerdown

X L X No Z Active L L

X L X Yes Z Active H L

INVALID INVALID X No Z Active L L auto-powerdown

INVALID INVALID X Yes Active Active H H auto-powerdown

(1) H = high level, L = low level, X = irrelevant, Z = high impedance

OR DRIVER

EDGE

WITHIN 30 s

VALID

RS-232

PRESENT AT

RECEIVER

Auto-Powerdown Plus Conditions

Auto-Powerdown Conditions

(1)

OPERATING

MODE

Normal operation, plus disabled

Normal operation, plus enabled

Power down, plus enabled

Manual power down

Power down, enabled

Normal operation, enabled

Product Folder Links: TRS3318E

DIN2

DIN1

DOUT2

DOUT1

Auto-powerdown Plus

INVALID

RIN1

RIN2

FORCEOFF

FORCEON

ROUT1

ROUT2

5 k

Ω

READY

TRS3318E

www.ti.com

SLLS805B –APRIL 2007–REVISED OCTOBER 2013

LOGIC DIAGRAM (POSITIVE LOGIC)

TERMINAL FUNCTIONS

TERMINAL

NAME NO.

C1+ 2 Positive voltage-doubler charge-pump capacitor C1– 4 Negative voltage-doubler charge-pump capacitor C2+ 5 Positive inverting charge-pump capacitor C2– 6 Negative inverting charge-pump capacitor DIN 12, 13 CMOS driver inputs DOUT 8, 17 RS-232 driver outputs

FORCEOFF 20

FORCEON 14 GND 18 Ground INVALID 11

READY 1 RIN 9, 16 RS-232 receiver inputs

ROUT 10, 15 CMOS receiver outputs V+ 3 2 × VCCgenerated by the charge pump V– 7 –2 × VCCgenerated by the charge pump V

Force-off input, active low. Drive low to power down transmitters and charge pump. This overrides autopowerdown and FORCEON (see Function Table).

Force-on input, active high. Drive high to override auto-powerdown, keeping transmitters on (FORCEOFF must be high) (see Function Table).

Valid signal detector output, active low. A logic high indicates that a valid RS-232 level is present on a receiver input.

Ready to transmit output, active high. READY is enabled high when V– goes below –3.5 V and the device is ready to transmit.

19 2.25-V to 3-V single-supply voltage

DESCRIPTION

Product Folder Links: TRS3318E

TRS3318E

SLLS805B –APRIL 2007–REVISED OCTOBER 2013

Absolute Maximum Ratings

(1)

www.ti.com

over operating free-air temperature range (unless otherwise noted)

MIN MAX UNIT

VCCto GND –0.3 6 V V+ to GND V– to GND V+ + IV–I

Input voltage V

Output voltage V

Short-circuit duration DOUT to GND Continuous

Continuous power dissipation (TA= 70°C) mW

Storage temperature range –65 150 °C Lead temperature (soldering, 10 s) 300 °C

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings

(2) V+ and V– can have maximum magnitudes of 7 V, but their absolute difference cannot exceed 13 V.

(2) (2)

(2)

DIN, FORCEON, FORCEOFF to GND –0.3 6 RIN to GND ±25 DOUT to GND ±13.2 ROUT, INVALID, READY to GND –0.3 VCC+ 0.3

20-pin SSOP (derate 8 mW/°C above 70°C) 640 20-pin TSSOP (derate 7 mW/°C above 70°C) 559

only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

–0.3 7 V

–7 0.3 V

13 V

Recommended Operating Conditions

See Figure 4

MIN NOM MAX UNIT

Supply voltage 2.25 2.5 3 V

VIHDriver and control high-level input voltage VCC= 2.5 V to 3 V 0.7 × V

VILDriver and control low-level input voltage VCC= 2.5 V to 3 V 0 0.3 × V VIReceiver input voltage –25 25 V

TAOperating free-air temperature °C

DIN, FORCEOFF, FORCEON

TRS3318EC 0 70 TRS3318EI –40 85

5.5 V

Product Folder Links: TRS3318E

TRS3318E

www.ti.com

SLLS805B –APRIL 2007–REVISED OCTOBER 2013

Supply Current Section Electrical Characteristics

over recommended ranges of supply voltage and operating free-air temperature, VCC= 2.25 V to 3 V, C1–C4 = 0.1 µF, TA= T

PARAMETER TEST CONDITIONS MIN TYP

DC Characteristics (VCC= 2.5 V, TA= 25°C)

Auto-powerdown plus supply current FORCEON = GND, FORCEOFF = VCC, All RIN and DIN idle 1 10 µA Auto-powerdown supply current FORCEOFF = GND 1 10 µA Supply current FORCEON = FORCEOFF = VCC, No load 0.3 2 mA

(1) Typical values are at VCC= 2.5 V, TA= 25°C.

MIN

to T

(unless otherwise noted)

MAX

(1)

MAX UNIT

ESD Protection

PARAMETER TEST CONDITIONS TYP UNIT

HBM ±15

RIN, DOUT IEC 61000-4-2 Air-Gap Discharge method ±15 kV

IEC 61000-4-2 Contact Discharge method ±8

Product Folder Links: TRS3318E

TRS3318E

SLLS805B –APRIL 2007–REVISED OCTOBER 2013

www.ti.com

Driver Section Electrical Characteristics

over recommended ranges of supply voltage and operating free-air temperature, VCC= 2.25 V to 3 V, C1–C4 = 0.1 µF, TA= T

PARAMETER TEST CONDITIONS MIN TYP

Driver input hysteresis 0.3 V Input leakage current FORCEON, DIN, FORCEOFF ±0.01 ±1 µA Output voltage swing All driver outputs loaded with 3 kΩ to ground ±3.7 ±4 V Output resistance VCC= 0, Driver output = ±2 V 300 10M Ω Output short-circuit current Output leakage current VCC= 0 or 2.25 V to 3 V, V

(1) Typical values are at VCC= 2.5 V, TA= 25°C. (2) Short-circuit durations should be controlled to prevent exceeding the device absolute power dissipation ratings, and not more than one

output should be shorted at a time.

(2)

MIN

to T

(unless otherwise noted) (see Figure 4)

MAX

= ±12 V, Drivers disabled ±25 µA

OUT

(1)

MAX UNIT

±25 ±60 mA

Switching Characteristics

over recommended ranges of supply voltage and operating free-air temperature, VCC= 2.25 V to 3 V, C1–C4 = 0.1 µF, TA= T

PARAMETER TEST CONDITIONS MIN TYP

Maximum data rate RL= 3 kΩ, CL= 1000 pF, One transmitter switching 460 kbps

– t

PHL

| Driver skew

PLH

Transition-region slew rate Measured from 3 V to –3 V or –3 V to 3 V, 4 30 V/µs

(2)

MIN

to T

(unless otherwise noted) (see Figure 1)

MAX

VCC= 2.5 V, TA= 25°C, RL= 3 kΩ to 7 kΩ, CL= 150 pF to 2500 pF

(1)

MAX UNIT

100 ns

(1) Typical values are at VCC= 2.5 V, TA= 25°C. (2) Pulse skew is defined as |t

PLH

– t

| of each channel of the same device.

PHL

Product Folder Links: TRS3318E

TRS3318E

www.ti.com

SLLS805B –APRIL 2007–REVISED OCTOBER 2013

Receiver Section Electrical Characteristics

over recommended ranges of supply voltage and operating free-air temperature, VCC= 2.25 V to 3 V, C1–C4 = 0.1 µF, TA= T

PARAMETER TEST CONDITIONS MIN TYP

Input voltage range –25 25 V Input threshold low TA= 25°C 0.3 × V Input threshold high TA= 25°C 0.7 × V Input hysteresis 0.3 V Input resistance TA= 25°C 3 5 7 kΩ Output leakage current ±0.05 ±10 µA Output voltage low I Output voltage high I

(1) Typical values are at VCC= 2.5 V, TA= 25°C.

= 0.5 mA 0.1 × V

OUT

= –0.5 mA 0.9 × V

OUT

MIN

to T

(unless otherwise noted) (see Figure 4)

MAX

(1)

MAX UNIT

Switching Characteristics

over recommended ranges of supply voltage and operating free-air temperature, VCC= 2.25 V to 3 V, C1–C4 = 0.1 µF (unless otherwise noted) (see Figure 4)

(1)

0.175

0.175 50 ns

t t |t

PHL PLH

PHL

Receiver propagation delay RIN to ROUT, CL= 150 pF µs

– t

| Receiver skew

PLH

PARAMETER TEST CONDITIONS TYP

(2)

V V

UNIT

(1) Typical values are at VCC= 2.5 V, TA= 25°C. (2) Pulse skew is defined as |t

PLH

– t

| of each channel of the same device.

PHL

Product Folder Links: TRS3318E

+ 15 hidden pages