SSP485N

Product Catgories

Short Description:

The SSP485N is a half-duplex high speed transceiver for RS-485 communication. IC contains one driver and one receiver, It has adaptive function. The SSP485N has a fail-safe circuit，ensure logical high level of receiver output when receiver input is open or short. The SSP485N receiver has 1/8 unit load input impedance, allows up to 256 devices can be attached to the bus.

Tags: Communication circuit, Low Power transceiver, MBUS, Meter-Bus Transceiver, receiver, RS-485 Transceivers, transceiver

Product Detail

Features

I/O pin ESD protection: +15kV HBM IEC 61000-4-2

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

Fractional unit load allows up to 256devices on the bus
Adaptive connection function:reverse connection communication of communication ports A and B is realized, polarity recognition time is 78ms
Operating voltage: +5V(Typical.)
Low current shutdown mode operating current：1nA
Current limiting and thermal turn-off function can be used for driver overloadprotection
SOP8package

Applications

Intelligent instrument
Industrial process control
Building automation network
Motor control

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	-13~15	V
Operating Temperature	T_amb	-40~85	℃
Storage Temperature	T_stg	-65~150	℃

DC Electrical Characteristics

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

Parameter	Symbol	Test Conditions			Min	Typ	Max	Unit
Operating voltage	V_CC				4.5		5.5	V
Driver
Differential driver output	V_OD1	No load					5	V
Differential driver output	V_OD2	R=50Ω⁽¹⁾			2.0	3.5		V
Differential driver output	V_OD2	R=27Ω⁽¹⁾			1.5	2.7		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⁾				2.2		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			75	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			-100	-50	100	mV
input hysteresis voltage	ΔV_TH					25		mV
output high voltage	V_OH	I_O=-4mA，V_ID=-50mV			4.5			V
output low voltage	V_OL	I_O=4mA，V_ID=-200mV					0.2	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			520	600	mA
Supply Current	I_CC	No load，=DI =GND or V_DD	DE=GND			430	600	mA
Polarity Discrimination Time	Tdtect					78		ms

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		500			kbps
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⁾		127	200	ns
Receiver Input to Output	t_RPHL	\|V_ID\|≥2.0V Rise or Fall Time≤15ns⁽⁴⁾		127	200	ns
\|t_RPLH-t_RPHL\|	t_RSKD	\|V_ID\|≥2.0V Rise or Fall Time≤15ns⁽⁴⁾		3	±30	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

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

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Product Detail

Parameter table

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SSP485N

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