SSP485

Product Catgories

Short Description:

The SSP485 is a half-duplex high speed transceiver for RS-485 and RS422 communication. IC contains one driver and one receiver. The SSP485 has a fail-safe circuit. Each driver output and receiver input is protected against ±15kV electrostatic discharge (HBM) (ESD)shocks. The SSP485 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: Active component, Communication circuit, receiver, RS-485 Transceivers

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 (For + 3.3v power supply, recommend the maximum transmission rate is 500Kbps)
Data transmission up to 2Mbps
Low current shutdown mode operating current：1nA
Current limiting and thermal turn-off function can be used for driver overload protection

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				5	V
Differential driver output	V_OD2	R=50Ω（RS-422）⁽¹⁾		2.0			V
Differential driver output	V_OD2	R=27Ω（RS-485）⁽¹⁾		1.5			V
Change in magnitude of driver differential output voltage for complementary output states	ΔV_OD	R=50Ω or 27Ω⁽¹⁾			0.01	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⁾			0.01	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
Input current (A, B)	I_IN2	DE=GND， V_DD=GND or 5.25V	Vin=12V			125	mA
Input current (A, B)	I_IN2	DE=GND， V_DD=GND or 5.25V	Vin=-7V			-75	mA
Driver short-circuit current	I_OD1	-7V≤V_OUT≤V_DD		-250			mA
		0V≤V_OUT≤12V				250	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				25		mV
output high voltage	V_OH	I_O=-4mA，V_ID=-50mV		3.5			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		±95	mA
Supply Current	I_CC	No load，=DI =GND or V_DD	DE=V_DD		450	900	mA
Supply Current	I_CC	No load，=DI =GND or V_DD	DE=GND		450	600	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
Driver Input to Output	t_DPLH	R_DIFF=54Ω，C_L1=C_L2=100pF⁽²⁾		34	60	ns
Driver Input to Output	t_DPHL	R_DIFF=54Ω，C_L1=C_L2=100pF⁽²⁾		34	60	ns
\|t_DPLH-t_DPHL\|	t_DSKEW	R_DIFF=54Ω，CL1=CL2=100pF⁽²⁾		-2.5	±10	ns
Driver Rise or Fall Time	t_DR,t_DF	R_DIFF=54Ω，C_L1=C_L2=100pF⁽²⁾		14	25	ns
Maximum Data Rate	f_MAX			2		Mbps
Driver Enable to Output High	t_DZH	C_L=100pF，S2 closed⁽³⁾			150	ns
Driver Enable to Output Low	t_DZL	C_L=100pF，S1 closed⁽³⁾			150	ns
Driver Disable Time from Low	t_DLZ	C_L=15pF，S1 closed⁽³⁾			100	ns
Driver Disable Time from Low	t_DHZ	C_L=15pF，S2 closed⁽³⁾			100	ns
Receiver Input to Output	t_RPLH	\|V_ID\|≥2.0V Rise or Fall Time≤15ns⁽⁴⁾		106	150	ns
Receiver Input to Output	t_RPHL			106	150	ns
\|t_RPLH-t_RPHL\|	t_RSKD	\|V_ID\|≥2.0V Rise or Fall Time≤15ns⁽⁴⁾		0	±10	ns
Receiver Enable to Output Low	t_RZL	C_L=100pF，S1 closed⁽⁵⁾		20	50	ns
Receiver Enable to Output High	t_RZH	C_L=100pF，S2 closed⁽⁵⁾		20	50	ns
Receiver Disable Time from Low	t_RLZ	C_L=100pF，S1 closed⁽⁵⁾		20	50	ns
Receiver Disable Time from High	t_RHZ	C_L=100pF，S2 closed⁽⁵⁾		20	50	ns
Time to Shutdown	t_SHDN		50	200	600	ns
Driver Enable from Shutdown to Output High	t_DZH(SHDN)	C_L=15pF，S2 closed⁽³⁾			250	ns
Driver Enable from Shutdown to Output Low	t_DZL(SHDN)	C_L=15pF，S1 closed⁽³⁾			250	ns
Receiver Enable from Shutdown to Output High	t_RZH(SHDN)	C_L=100pF，S2 closed⁽³⁾			3500	ns
Receiver Enable from Shutdown to Output Low	t_RZL(SHDN)	C_L=100pF，S1 closed⁽³⁾			3500	ns

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SSP485

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