THVD14X6

Half-Duplex RS-485 Transceiver

The THVD14X6 is a half-duplex rs-485 transceiver from Texas Instruments. View the full THVD14X6 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

THVD14X6 shares its datasheet with THVD1406, whose page lists every part number it covers.

Official THVD14X6 datasheet (PDF) — the source this page was extracted from.

Manufacturer

Texas Instruments

THVD14X6 Key Specifications

Parameter	Value
Case/Package	SOIC
Data Rate	500kbps
Duplex	Half
Height	1.75 mm
Length	4.9 mm
Lifecycle Status	Production (Last Updated: 2 days ago)
Manufacturer Lifecycle Status	ACTIVE (Last Updated: 2 days ago)
Mounting Type	Surface Mount
Number of Drivers/Receivers	1/1
Number of Pins	8
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Protocol	RS422, RS485
Receiver Hysteresis	50 mV
RoHS	Compliant
Supplier Device Package	8-SOIC
Thickness	1.58 mm
Type	Transceiver
Supply Voltage	3V ~ 5.5V
Width	3.91 mm

THVD14X6 Overview

Part: THVD1406 / THVD1426 (THVD1406DR) — Texas Instruments

Type: Half-Duplex RS-485 Transceiver with Auto-Direction Control

Description: 3–5.5 V half-duplex RS-422/RS-485 transceiver with auto-direction control on the data input pin, ±12 kV IEC 61000-4-2 contact ESD protection, and signaling rates of 500 kbps (THVD1406) or 12 Mbps (THVD1426).

Operating Conditions:

Supply voltage: 3–5.5 V
Operating ambient temperature: -40 to 125 °C
Input voltage at any bus terminal: -7 to 12 V
Signaling rate: up to 500 kbps (THVD1406), up to 12 Mbps (THVD1426)

Absolute Maximum Ratings:

Max supply voltage: 7 V
Voltage at A or B: -16 to 16 V
Input voltage at logic pins (D, SHDN, RE): -0.3 to 5.7 V
Receiver output current: ±24 mA
Max junction temperature: 170 °C
Storage temperature: -65 to 150 °C

Key Specs:

Driver differential output |VOD|, RL = 54 Ω, 4.5 V ≤ VCC ≤ 5.5 V: 2.1 V min, 3 V typ
Driver short-circuit output current |IOS|: ±250 mA max
Receiver thresholds: VIT- -200 mV min, -150 mV typ; hysteresis 30 mV min, 50 mV typ
Bus input current at VI = 12 V: 75 μA typ, 100 μA max
Quiescent ICC, VCC = 5.5 V, driver and receiver enabled: 1700 μA typ, 3000 μA max
Shutdown ICC, VCC = 5.5 V: 3 μA typ, 6.9 μA max
THVD1406 driver propagation delay: 275 ns typ, 500 ns max
THVD1426 driver propagation delay: 17 ns typ, 35 ns max
Thermal resistance RθJA: 126.0 °C/W (SOIC), 112.2 °C/W (SOT)

Features:

Meets or exceeds TIA/EIA-485A requirements
Auto-direction control using the data input pin
Bus I/O protection: ±16 kV HBM, ±12 kV IEC contact, ±15 kV IEC air-gap, ±4 kV IEC EFT
±16 V bus fault protection
Large receiver hysteresis for noise rejection
Glitch-free power-up/power-down for hot plug-in
Open, short, and idle bus fail-safe
1/8 unit load (up to 256 bus nodes)
Thermal shutdown protection

Applications:

Factory automation and control
Building automation
HVAC systems
Video surveillance
Smart meters

Package:

SOIC-8 (D): 4.90 mm × 3.91 mm (THVD1406)
SOT-8 (DRL): 2.10 mm × 1.20 mm (THVD1426)

THVD14X6 Features

Meets or exceeds the requirements of the TIA/ EIA-485A standard
3-V to 5.5-V Supply voltage
Auto-direction control using the data input pin
Half-duplex RS-422/RS-485
Data rates
Bus I/O protection
-±16-kV HBM ESD
-±12-kV IEC 61000-4-2 Contact discharge
-±15-kV IEC 61000-4-2 Air gap discharge
-±4-kV IEC 61000-4-4 Fast transient burst
±16-V bus fault protection
Small, space-saving 8-Pin SOT package option (2.1 mm x 1.2 mm)
-See the layout example for co-layout with standard SOIC-8 package
Extended industrial temperature range: -40°C to 125°C
Large receiver hysteresis for noise rejection
Low power consumption
-Low standby supply current: 3μA (typ)
-Quiescent current during operation: 1.7 mA (typ)
Glitch-free power-up, power-down for hot plug-in capability
Open, short, and idle bus fail-safe
1/8 Unit load (Up to 256 bus nodes)
THVD1406: 500 kbps
THVD1426: 12 Mbps

THVD14X6 Applications

THVD14X6 Pin Configuration

Figure 5-1. D (8-Pin SOIC) , DRL (8-Pin SOT) Top View

Table 5-1. Pin Functions

PIN - NAME	PIN - NO.	I/O	DESCRIPTION
R	1	O	Receiver data output
RE	2	I	Receiver enable, active low (internal 2-MΩ pull-up)
SHDN	3	I	Shutdown enable, active low (internal 2-MΩ pull-up)
D	4	I	Driver data input
GND	5	-	Device ground
A	6	I/O	Bus I/O port, A (complementary to B)
B	7	I/O	Bus I/O port, B (complementary to A)
V CC	8	P	3-V to 5.5-V supply For the device.

THVD14X6 Electrical Characteristics

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

	PARAMETER	TEST CONDITIONS	TEST CONDITIONS	TEST CONDITIONS	MIN	TYP	MAX	UNIT
Driver	Driver	Driver	Driver	Driver	Driver	Driver	Driver	Driver
│V OD │	Driver differential-output voltage magnitude	R L = 60 Ω, -7 V ≤ V test ≤ 12 V	R L = 60 Ω, -7 V ≤ V test ≤ 12 V	See Figure 7-1	1.5	2		V
│V OD │	Driver differential-output voltage magnitude	RL = 60 Ω, -7 V ≤ Vtest ≤ 12 V, 4.5 V ≤ Vcc ≤ 5.5 V	RL = 60 Ω, -7 V ≤ Vtest ≤ 12 V, 4.5 V ≤ Vcc ≤ 5.5 V	See Figure 7-1	2.1	3		V
│V OD │	Driver differential-output voltage magnitude	R L = 100 Ω, C L = 50 pF	R L = 100 Ω, C L = 50 pF	See Figure 7-1	2	2.5		V
│V OD │	Driver differential-output voltage magnitude	R L = 54 Ω, C L = 50 pF	R L = 54 Ω, C L = 50 pF	See Figure 7-2	1.5	2		V
│V OD │	Driver differential-output voltage magnitude	R L = 54 Ω, 4.5 V ≤ V cc ≤ 5.5 V	R L = 54 Ω, 4.5 V ≤ V cc ≤ 5.5 V	See Figure 7-1	2.1	3		V
Δ│V OD │	Change in magnitude of driver differential-output voltage				-50		50	mV
V OC(SS)	Steady-state common-mode output voltage	R L = 54 Ω or 100 Ω, C L = 50 pF	R L = 54 Ω or 100 Ω, C L = 50 pF	See Figure 7-2	1	V CC / 2	3	V
ΔV	in differential driver common-mode output voltage	OC Change	OC Change	See Figure 7-2	-50		50	mV
V OC(PP)	Peak-to-peak driver common- mode output voltage	R L = 54 Ω or 100 Ω, C L = 50 pF, V CC = 3.3 V	R L = 54 Ω or 100 Ω, C L = 50 pF, V CC = 3.3 V	See Figure 7-2		200		mV
│I OS │	Driver short-circuit output current	-7 V ≤ [V A or V B ] ≤ 12 V, or A pin shorted to B pin	-7 V ≤ [V A or V B ] ≤ 12 V, or A pin shorted to B pin	-7 V ≤ [V A or V B ] ≤ 12 V, or A pin shorted to B pin	-250		250	mA
Receiver	Receiver	Receiver	Receiver	Receiver	Receiver	Receiver	Receiver	Receiver
I	Bus input current (driver disabled)		or 5.5 V	V I = 12 V		75	100	μA
I		I	I	V I = -7 V	-97	-70		μA
V IT+	Positive-going receiver differential-input voltage threshold					-70	-45	mV
V IT-	Negative-going receiver voltage	-7 differential-input threshold	≤ 12 V	-7 differential-input threshold	-200	-150		mV
V HYS	differential-input threshold hysteresis (V IT+ - V IT- )	(1) Receiver voltage	(1) Receiver voltage	(1) Receiver voltage	30	50		mV
V OH	Receiver high-level output voltage	I OH = -4 mA	I OH = -4 mA	I OH = -4 mA	V CC - 0.4	V CC - 0.2		V
V OL	Receiver low-level output voltage	I OL = 4 mA	I OL = 4 mA	I OL = 4 mA		0.2	0.4	V
I OZ	Receiver high-impedance output current	V O = 0 V or V CC , RE = V CC	V O = 0 V or V CC , RE = V CC	V O = 0 V or V CC , RE = V CC	-1		1	μA
Logic	Logic	Logic	Logic	Logic	Logic	Logic	Logic	Logic
I	Input current (D, SHDN, RE)	IN	IN	IN	-5		5	μA
Supply	Supply	Supply	Supply	Supply	Supply	Supply	Supply	Supply
I CC	Supply current (quiescent)	V CC = 3.6 V	Driver and receiver enabled	SHDN = V CC, RE = 0 D = 0, no load		1500	1800	μA
I CC	Supply current (quiescent)	V CC = 3.6 V	Driver enabled, receiver disabled	SHDN = V CC , RE = V CC , D=0, no load		1000	1500	μA
I CC	Supply current (quiescent)	V CC = 3.6 V	Driver and receiver disabled	SHDN = 0, no load		2	4.1	μA
I CC	Supply current (quiescent)	V CC = 5.5 V	Driver and receiver enabled	SHDN = V CC, RE = 0 D = 0, no load		1700	3000	μA
I CC	Supply current (quiescent)	V CC = 5.5 V	Driver enabled, receiver disabled	SHDN = V CC , RE = V CC , D=0, no load		1300	2500	μA
I CC	Supply current (quiescent)		Driver and receiver disabled	SHDN = 0, no load		3	6.9	μA

THVD14X6 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)

		MIN	MAX	UNIT
V CC	Supply voltage	-0.5	7	V
V L	Input voltage at any logic pin (D, SHDN or RE)	-0.3	5.7	V
V A , V B	Voltage at A or B inputs	-16	16	V
I O	Receiver output current	-24	24	mA
T J	Junction temperature		170	°C
T STG	Storage temperature	-65	150	°C

THVD14X6 Recommended Operating Conditions

			MIN	NOM	MAX	UNIT
V CC	Supply voltage	Supply voltage	3	5	5.5	V
V ID	Differential input voltage	Differential input voltage	-12		12	V
V I	Input voltage at any bus terminal (1)	Input voltage at any bus terminal (1)	-7		12	V
V IH	High-level input voltage (D, SHDN, and RE inputs)	High-level input voltage (D, SHDN, and RE inputs)	2		5.5	V
V IL	Low-level input voltage (D, SHDN, and RE inputs)	Low-level input voltage (D, SHDN, and RE inputs)	0		0.8	V
I O	Output current	Driver	-60		60	mA
		Receiver	-8		8	mA
R L	Differential load resistance	Differential load resistance	54	60		Ω
1/t UI	Signaling rate: THVD1406	Signaling rate: THVD1406			500	kbps
1/t UI	Signaling rate: THVD1426	Signaling rate: THVD1426			12	Mbps
T J	Junction temperature	Junction temperature	-40		150	°C
T A (2)	Operating ambient temperature	Operating ambient temperature	-40		125	°C
T SHDN	Thermal shutdown threshold (temperature rising)	Thermal shutdown threshold (temperature rising)	150	170		°C
T HYS	Thermal shutdown hysteresis	Thermal shutdown hysteresis		15		°C

(2) Operation is specified for internal (junction) temperatures up to 150°C. Self-heating due to internal power dissipation should be considered for each application. Maximum junction temperature is internally limited by the thermal shut-down (TSD) circuit which disables the driver outputs when the junction temperature reaches 170°C.

THVD14X6 Thermal Information

THERMAL METRIC (1)	THERMAL METRIC (1)	THVD1406, THVD1426 - DRL (SOT) - 8 PINS	THVD1406, THVD1426 - D (SOIC) - 8 PINS	UNIT
R θJA	Junction-to-ambient thermal resistance	112.2	126.0	°C/W
R θJC(top)	Junction-to-case (top) thermal resistance	28.4	66.2	°C/W
R θJB	Junction-to-board thermal resistance	22.1	69.4	°C/W
ψ JT	Junction-to-top characterization parameter	1.2	18.7	°C/W
ψ JB	Junction-to-board characterization parameter	22.0	68.7	°C/W

THVD14X6 Typical Application

The THVD14x6 devices are half-duplex RS-485 transceivers commonly used for asynchronous data transmissions. The device can be used in auto-direction mode by tying SHDN and RE pins together to logic high and controlling the driver and receiver using the data input pin, D. This enables reducing the number of GPIO pins or the number of isolation channels required to operate the device. Please refer to Driver Function Table and Receiver Function Table for further details.

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part Number	Manufacturer	Package
THVD1406	Texas Instruments	—
THVD1406DR	Texas Instruments	8-SOIC (0.154", 3.90mm Width)
THVD1406DRLR	Texas Instruments	—
THVD1426	Texas Instruments	—

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