SP481E

Part: SP481E / SP485E — Exar Type: Half-Duplex RS-485 Transceiver Description: +5V only, low power BiCMOS half-duplex RS-485/RS-422 transceivers with enhanced ESD protection up to +/-15kV IEC1000-4-2 Air Discharge and 10Mbps transmission rate.

Operating Conditions:

• Supply voltage: +4.75V to +5.25V
• Operating temperature: -40 to +125 °C (suffix-dependent — see Electrical Characteristics for grade-specific ranges)
• Max transmission rate: 10 Mbps

Absolute Maximum Ratings:

• Max supply voltage: +7V
• Max driver/receiver input voltage: +/-15V
• Max storage temperature: -65°C to +150°C

Key Specs:

• Differential Output Voltage (unloaded): GND to Vcc Volts
• Differential Output Voltage (R=27Ω): 1.5 Volts min
• Driver Short Circuit Current: +/-250 mA
• Receiver Differential Input Threshold: -0.2V to +0.2V
• Receiver Input Hysteresis: 20 mV
• Receiver Input Resistance: 12 kΩ min, 15 kΩ typ
• Supply Current (no load, SP485E): 900 μA typ
• Supply Current (shutdown mode, SP481E): 10 μA max

Features:

• +5V Only operation
• Low Power BiCMOS design
• Driver / Receiver Enable for Multi-Drop configurations
• Low Power Shutdown mode (SP481E only)
• Enhanced ESD Specifications: +/- 5kV Human Body Model, +/-15kV IEC1000-4-2 Air Discharge, +/-8kV IEC1000-4-2 Contact Discharge
• Pin-to-pin compatible with SP481 and SP485 devices

Applications:

• Multi-drop applications
• Long-distance interfaces

Package:

• 8-pin NSOIC
• 8-pin PDIP

Pin  - RO - Receiver Output

Pin 2 - RE - Receiver Output Enable Active LOW

Pin 3 - DE - Driver Output Enable Active HIGH

Pin 4 DI - Driver Input

Pin 5 - GND - Ground Connection

Pin 6 - A - Driver Output / Receiver input Non-Inverting

Pin 7 - B - Driver Output / Receiver Input Inverting

Pin 8 - Vcc - Positive Supply 4.75V ≤ Vcc ≤ 5.25V

to T

and V

= +5.0V +/-5% unless otherwise noted.

PARAMETERS	MIN.	TYP.	MAX.	UNITS	CONDITIONS
SP481E/SP485E DRIVER	SP481E/SP485E DRIVER	SP481E/SP485E DRIVER	SP481E/SP485E DRIVER	SP481E/SP485E DRIVER	SP481E/SP485E DRIVER
DC Characteristics	DC Characteristics	DC Characteristics	DC Characteristics	DC Characteristics	DC Characteristics
Differential Output Voltage	GND		Vcc	Volts	Unloaded; R = ∞ ; see Figure 1
Differential Output Voltage	2		Vcc	Volts	With Load; R = 50Ω (RS-422); see Figure 1
Differential Output Voltage	.5		Vcc	Volts	With Load; R = 27Ω (RS-485); see Figure 1
Change in Magnitude of Driver Differential Output Voltage for Complimentary states			0.2	Volts	R = 27Ω or R = 50Ω; see Figure 1
Driver Common Mode Output Voltage			3	Volts	R = 27Ω or R = 50Ω; see Figure 1
Input High Voltage	2.0			Volts	Applies to DE, DI, RE
Input Low Voltage			0.8	Volts	Applies to DE, DI, RE
Input Current			+/-0	μA	Applies to DE, DI, RE
Driver Short Circuit Current
V OUT = HIGH			+/-250	mA	-7V ≤ V O ≤ +12V
V OUT = LOW			+/-250	mA	-7V ≤ V O ≤ +12V
SP481E/SP485E DRIVER	SP481E/SP485E DRIVER	SP481E/SP485E DRIVER	SP481E/SP485E DRIVER	SP481E/SP485E DRIVER	SP481E/SP485E DRIVER
AC Characteristics	AC Characteristics	AC Characteristics	AC Characteristics	AC Characteristics	AC Characteristics
Max. Transmission Rate	0			Mbps	RE = 5V, DE = 5V; R DIFF = 54Ω, C L = C L2 = 00pF
Driver Input to Output, t PLH		30	60	ns	See Figures 3 & 5, R DIFF = 54Ω, C L = C L2 = 00pF
Driver Input to Output, t PLH (SP485EMN ONLY)		30	80	ns	See Figures 3 & 5, R DIFF = 54Ω, C L = C L2 = 00pF
Driver Input to Output, t PHL		30	60	ns	See Figures 3 & 5, R DIFF = 54Ω, C L = C L2 = 00pF
Driver Input to Output, t PHL (SP485EMN ONLY)		30	80	ns	See Figures 3 & 5, R DIFF = 54Ω, C L = C L2 = 00pF
Driver Skew		5	0	ns	see Figures 3 and 5, t SKEW = \
Driver Rise or Fall Time		5	40	ns	From 0%-90%; R DIFF = 54Ω C L = C L2 = 100pF; see Figures 3 and 6

MIN

MAX

CC

PARAMETERS	MIN.	TYP.	MAX.	UNITS	CONDITIONS
SP481E/SP485E DRIVER (continued)	SP481E/SP485E DRIVER (continued)	SP481E/SP485E DRIVER (continued)	SP481E/SP485E DRIVER (continued)	SP481E/SP485E DRIVER (continued)	SP481E/SP485E DRIVER (continued)
AC Characteristics	AC Characteristics	AC Characteristics	AC Characteristics	AC Characteristics	AC Characteristics
Driver Enable to Output High		40	70	ns	C L = 100pF, see Figures 4 and 6, S 2 closed
Driver Enable to Output Low		40	70	ns	C L = 100pF, see Figures 4 and 6, S  closed
Driver Disable Time from High		40	70	ns	C L = 100pF, see Figures 4 and 6, S 2 closed
Driver Disable Time from Low		40	70	ns	C L = 100pF, see Figures 4 and 6, S  closed
SP481E/SP485E RECEIVER	SP481E/SP485E RECEIVER	SP481E/SP485E RECEIVER	SP481E/SP485E RECEIVER	SP481E/SP485E RECEIVER	SP481E/SP485E RECEIVER
DC Characteristics	DC Characteristics	DC Characteristics	DC Characteristics	DC Characteristics	DC Characteristics
Differential Input Threshold	-0.2		+0.2	Volts	-7V ≤ V CM ≤ +12V
Differential Input Threshold (SP485EMN ONLY)	-0.4		+0.4	Volts	-7V ≤ V CM ≤ +12V
Input Hysteresis		20		mV	V CM = 0V
Output Voltage High	3.5			Volts	I O = -4mA, V ID = +200mV
Output Voltage Low			0.4	Volts	I O = +4mA, V ID = +200mV
Three-State ( High Impedance) Output Current			+/-	μA	0.4V ≤ V O ≤ 2.4V; RE = 5V
Input Resistance	2	5		kΩ	-7V ≤ V CM ≤ +12V
Input Current (A, B); V IN = 2V			+.0	mA	DE = 0V, V CC = 0V or 5.25V, V IN = 2V
Input Current (A, B); V IN = -7V			-0.8	mA	DE = 0V, V CC = 0V or 5.25V, V IN = -7V
Short Circuit Current	7		95	mA	0V ≤ V O ≤ V CC
SP481E/SP485E RECEIVER	SP481E/SP485E RECEIVER	SP481E/SP485E RECEIVER	SP481E/SP485E RECEIVER	SP481E/SP485E RECEIVER	SP481E/SP485E RECEIVER
AC Characteristics	AC Characteristics	AC Characteristics	AC Characteristics	AC Characteristics	AC Characteristics
Max. Transmission Rate	0			Mbps	RE = 0V, DE = 0V
Receiver Input to Output	20	45	00	ns	t PLH ; See Figures 3 & 7, R DIFF = 54Ω, C L = C L2 = 00pF
Receiver Input to Output	20	45	00	ns	t PHL ; See Figures 3 & 7, R DIFF = 54Ω, C L = C L2 = 00pF
Differential Receiver Skew \	t PHL - t PLH \			3
Receiver Enable to Output Low		45	70	ns	C RL = 15pF, Figures 2 & 8; S  Closed
Receiver Enable to Output High		45	70	ns	C RL = 15pF, Figures 2 & 8; S 2 Closed
Receiver Disable from LOW		45	70	ns	C RL = 15pF, Figures 2 & 8; S  Closed
Receiver Disable from High		45	70	ns	C RL = 15pF, Figures 2 & 8; S 2 Closed

T MIN to T MAX and V CC = +5.0V +/-5% unless otherwise noted.	T MIN to T MAX and V CC = +5.0V +/-5% unless otherwise noted.	T MIN to T MAX and V CC = +5.0V +/-5% unless otherwise noted.	T MIN to T MAX and V CC = +5.0V +/-5% unless otherwise noted.	T MIN to T MAX and V CC = +5.0V +/-5% unless otherwise noted.	T MIN to T MAX and V CC = +5.0V +/-5% unless otherwise noted.
PARAMETERS	MIN.	TYP.	MAX.	UNITS	CONDITIONS
SP481E
Shutdown Timing	Shutdown Timing	Shutdown Timing	Shutdown Timing	Shutdown Timing	Shutdown Timing
Time to Shutdown	50	200	600	ns	RE = 5V, DE = 0V
Driver Enable from Shutdown to Output High		40	00	ns	C L = 100pF; See Figures 4 and 6; S 2 Closed
Driver Enable from Shutdown to Output Low		40	00	ns	C L = 100pF; See Figures 4 and 6; S  Closed
Receiver Enable from Shutdown to Output High		300	000	ns	C L = 15pF; See Figures 2 and 8; S 2 Closed
Receiver Enable from Shutdown to Output Low		300	000	ns	C L = 15pF; See Figures 2 and 8; S  Closed
POWER REQUIREMENTS	POWER REQUIREMENTS	POWER REQUIREMENTS	POWER REQUIREMENTS	POWER REQUIREMENTS	POWER REQUIREMENTS
Supply Voltage V CC	+4.75		+5.25	Volts
Supply Current
SP481E/SP485E	SP481E/SP485E	SP481E/SP485E	SP481E/SP485E	SP481E/SP485E	SP481E/SP485E
No Load		900		μA	RE, DI = 0V or V CC ; DE = V CC
		600		μA	RE = 0V, DI = 0V or 5V; DE = 0V
SP481E	SP481E	SP481E	SP481E	SP481E	SP481E
Shutdown Mode			0	μA	DE = 0V, RE = V CC
ENVIRONMENTALAND MECHANICAL	ENVIRONMENTALAND MECHANICAL	ENVIRONMENTALAND MECHANICAL	ENVIRONMENTALAND MECHANICAL	ENVIRONMENTALAND MECHANICAL	ENVIRONMENTALAND MECHANICAL
Operating Temperature	Operating Temperature	Operating Temperature	Operating Temperature	Operating Temperature	Operating Temperature
Commercial (C)	0		70	°C
Industrial (E)	-40		+85	°C
(M)	-40		+25	°C
Storage Temperature	-65		+50	°C
Package	Package	Package	Package	Package	Package
Plastic DIP (_P)	Plastic DIP (_P)	Plastic DIP (_P)	Plastic DIP (_P)	Plastic DIP (_P)	Plastic DIP (_P)
NSOIC (_N)	NSOIC (_N)	NSOIC (_N)	NSOIC (_N)	NSOIC (_N)	NSOIC (_N)

Figure 1. RS-485 Driver DC Test Load Circuit

Figure 3. RS-485 Driver/Receiver Timing Test

These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

• Logic.........................-0.3V to (Vcc + 0.5V)
• Drivers......................-0.3V to (Vcc + 0.5V)
• Receivers.........................................+/-15V

T

• Logic.........................-0.3V to (Vcc + 0.5V)
• Drivers.............................................+/-15V
• Receivers..................-0.3V to (Vcc + 0.5V)
• Storage Temperature.......................-65˚C to +150˚C
• Power Dissipation 8-pin NSOIC...................................................550mW (derate 6.60mW/ºC above +70°C)
• 8-pin PDIP....................................................000mW (derate .8mW/ºC above +70°C)