SSP3485

Short Description:

The SSP3485 is a half-duplex high speed transceiver for RS-485 and RS422 communication. IC contains one driver and one receiver. The SSP3485 has a fail-safe circuit. It has a slew-rate-limited driver that reduces EMI and reflection due to improperly matched terminal cables, and achieves error-free data transmission of up to 10Mbps. Each driver output and receiver input is protected against ±15kV electrostatic discharge (HBM) (ESD)shocks. The SSP3485 receiver has 1/8 unit load input impedance, allows up to 256 devices can be attached to the bus. Mainly used in RS-485/RS-422 communication system.

Tags: Low Power transceiver, MBUS, Meter-Bus Transceiver, Transceiver IC

Product Detail

Features

I/O pin ESD protection：+15kV HBM

Other pins have level 3 ESD protection：>+8kV HBM

Fractional unit load allows up to 256 devices on the bus
+ 5V operating voltage
Data transmission up to 10Mbps
SOP8 and MSOP8 package

Applications

Intelligent instrument
Industrial process control
Building automation network
Motor control
EMI sensitive transceiver application

Parameter table

Absolute Maximum Ratings

Unless specified otherwise, Tamb= 25℃

Parameter	Symbol	Value	Unit
Supply Voltage	V_DD	-0.3~7	V
Input / Output Voltage	V_IN/V_OUT	GND-0.3~V_DD+0.3	V
A/B Input / Output Voltage	V_INA/B/V_OUTA/B	-13~13	V
Operating Temperature	T_amb	-40~85	℃
Storage Temperature	T	-65~150	℃

Electrical Characteristics

DC Electrical Characteristics

Unless specified otherwise，VDD=5V±5%，Tamb= 25℃

Parameter	Symbol	Test Conditions			Min	Typ	Max	Unit
Driver
Differential driver output	V_OD1	No load					VDD	V
Differential driver output	V_OD2	R=50Ω（RS-422）⁽¹⁾			2.0			V
Differential driver output	V_OD2	R=27Ω（RS-485）⁽¹⁾			1.8			V
Change in magnitude of driver differential output voltage for complementary output states	ΔV_OD	R=50Ω or 27Ω⁽¹⁾					0.2	V
Driver common-mode output voltage	V_OC	R=50Ω or 27Ω⁽¹⁾					3	V
Change in magnitude of driver common-mode output voltage for complementary output states	ΔV_OC	R=50Ω or 27Ω⁽¹⁾					0.2	V
Input high voltage	V_IH1	DE、、DI			2.0			V
Input low voltage	V_IL1	DE、、DI					0.8	V
Input current	I_IN1	DE、、DI			-2		2	mA
DI Input hysteresis voltage	V_hys					100		mA
Input current (A, B)	I_IN2	DE=GND，V_DD=GND or 5.25V		Vin=12V			150	mA
Input current (A, B)	I_IN2	DE=GND，V_DD=GND or 5.25V		Vin=-7V	-150			mA
Driver short-circuit current	I_OD1	-7V≤V_OUT≤V_DD			-100			mA
		0V≤V_OUT≤12V					100	mA
		0V≤V_OUT≤V_DD			±25			mA
Receiver
Differential threshold voltage	V_TH	-7V≤V_CM≤12V			-200	-125	-50	mV
input hysteresis voltage	ΔV_TH					40		mV
output high voltage	V_OH	I_O=-4mA，V_ID=-50mV			VDD-1			V
output low voltage	V_OL	I_O=4mA，V_ID=-200mV					0.4	V
3-state(high impedance) output current at receiver	I_OZR	0.4V≤V_O≤2.4V					±1	mA
input resistance	R_IN	-7V≤V_CM≤12V			96			kΩ
Receiver short-circuit current	I_OSR	0V≤V_RO≤V_DD			±7		±100	mA
Supply Current	I_CC	No load，=DI =GND or V_DD	DE=V_DD			450	1100	mA
Supply Current	I_CC	No load，=DI =GND or V_DD	DE=GND			450	1000	mA
Supply Current in Shutdown	I_SHDN	DE=GND，=V_DD					10	mA
ESD Protection（A/B）	ESD	Human Body Model				±15		kV

Transmission characteristics

Unless specified otherwise，VDD=5V±5%，Tamb= 25℃

Parameter	Symbol	Test Conditions	Min.	Typ.	Max.	Unit
slew-rate-limited
Driver Input to Output	t_DPLH	R_DIFF=54Ω，C_L1=C_L2=100pF⁽²⁾		30	60	ns
Driver Input to Output	t_DPHL	R_DIFF=54Ω，C_L1=C_L2=100pF⁽²⁾		30	60	ns
\|t_DPLH-t_DPHL\|	t_DSKEW	R_DIFF=54Ω，CL1=CL2=100pF⁽²⁾			20	ns
Driver Rise or Fall Time	t_DR,t_DF	R_DIFF=54Ω，C_L1=C_L2=100pF⁽²⁾		30		ns
Maximum Data Rate	f_MAX		10			Mbps
Driver Enable to Output High	t_DZH	C_L=100pF，S2 closed⁽³⁾			70	ns
Driver Enable to Output Low	t_DZL	C_L=100pF，S1 closed⁽³⁾			70	ns
Driver Disable Time from Low	t_DLZ	C_L=15pF，S1 closed⁽³⁾			70	ns
Driver Disable Time from Low	t_DHZ	C_L=15pF，S2 closed⁽³⁾			70	ns
Receiver Input to Output	t_RPLH	\|V_ID\|≥2.0V Rise or Fall Time≤15ns⁽⁴⁾		90	250	ns
Receiver Input to Output	t_RPHL	\|V_ID\|≥2.0V Rise or Fall Time≤15ns⁽⁴⁾		90	250	ns
\|t_RPLH-t_RPHL\|	t_RSKD	\|V_ID\|≥2.0V Rise or Fall Time≤15ns⁽⁴⁾		30		ns
Receiver Enable to Output Low	t_RZL	C_L=100pF，S1 closed⁽⁵⁾		30	70	ns
Receiver Enable to Output High	t_RZH	C_L=100pF，S2 closed⁽⁵⁾		30	70	ns
Receiver Disable Time from Low	t_RLZ	C_L=100pF，S1 closed⁽⁵⁾		30	70	ns
Receiver Disable Time from High	t_RHZ	C_L=100pF，S2 closed⁽⁵⁾		30	70	ns
Time to Shutdown	t_SHDN			200	600	ns

Note：

Test circuit is shown in Figure 1
Test circuit is shown in Figure 2
Test circuit is shown in Figure 3
Test circuit is shown in Figure 4
Test circuit is shown in Figure 5

Order specification

Part No	Package	Manner of Packing	Devices per bag/reel
SSP3485	SOP8	Reel	3500
SSP3485U	MSOP8	Reel	5000

SSP3485

Product Catgories

Core Ties, New Future

Selection application reference for LDO voltage regulator chip

Application of three-phase voltage measurement based on SSP1839

Application of Siproin SST-MRAM in Smart Meters

Tech Gala Unveils New Era in Electronics Industry

STT-MRAM Non-volatile magnetic random access memory

Short Description:

Product Detail

Parameter table

Tell me what you need

Related Products

Tell me what you need

SSP3485

Product Catgories

Core Ties, New Future

Selection application reference for LDO voltage regulator chip

Application of three-phase voltage measurement based on SSP1839

Application of Siproin SST-MRAM in Smart Meters

Tech Gala Unveils New Era in Electronics Industry

STT-MRAM Non-volatile magnetic random access memory

Short Description:

Product Detail

Parameter table

Tell me what you need

Related Products

SSP6206

SSP8810

SSP3085

Tell me what you need