SP485E. Enhanced Low Power Half-Duplex RS-485 Transceivers

SP481E/SP485E ® Enhanced Low Power Half-Duplex RS-485 Transceivers ■ +5V Only ■ Low Power BiCMOS ■ Driver/Receiver Enable for Multi-Drop configurati...
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SP481E/SP485E

®

Enhanced Low Power Half-Duplex RS-485 Transceivers ■ +5V Only ■ Low Power BiCMOS ■ Driver/Receiver Enable for Multi-Drop configurations ■ Low Power Shutdown Mode (SP481E) ■ Enhanced ESD Specifications: +15KV Human Body Model +15KV IEC1000-4-2 Air Discharge +8KV IEC1000-4-2 Contact Discharge

DESCRIPTION The SP481E and the SP485E are a family of half-duplex transceivers that meet the specifications of RS-485 and RS-422 serial protocols with enhanced ESD performance. The ESD tolerance has been improved on these devices to over +15KV for both Human Body Model and IEC1000-4-2 Air Discharge Method. These devices are pin-to-pin compatible with Sipex's SP481 and SP485 devices as well as popular industry standards. As with the original versions, the SP481E and the SP485E feature Sipex's BiCMOS design allowing low power operation without sacrificing performance. The SP481E and SP485E meet the requirements of the RS-485 and RS-422 protocols up to 10Mbps under load. The SP481E is equipped with a low power Shutdown mode.

RO 1

8 Vcc

R

RE 2

7B

DE 3

6A

DI 4

D

5 GND

SP481E and SP485E

Rev. 5/16/03

SP481E Low Power Half-Duplex RS485 Transceivers

1

© Copyright 2003 Sipex Corporation

ABSOLUTE MAXIMUM RATINGS 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. VCC............................................................................................................+7V Input Voltages Logic........................................................-0.3V to (VCC+0.5V) Drivers..................................................-0.3V to (VCC+0.5V) Receivers................................................................. ±15V

Output Voltages 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 per Package 8-pin NSOIC (derate 6.60mW/oC above +70oC)...........................550mW 8-pin PDIP (derate 11.8mW/oC above +70oC)............................1000mW

SPECIFICATIONS TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.

PARAMETERS SP481E/SP485E DRIVER DC Characteristics Differential Output Voltage Differential Output Voltage

MIN.

TYP.

MAX.

UNITS

CONDITIONS

GND 2

VCC VCC

Volts Volts

Differential Output Voltage Change in Magnitude of Driver Differential Output Voltage for Complimentary States Driver Common-Mode Output Voltage Input High Voltage Input Low Voltage Input Current Driver Short-Circuit Current VOUT = HIGH VOUT = LOW SP481E/SP485E DRIVER AC Characteristics Maximum Data Rate

1.5

VCC

Volts

Unloaded; R = ∞ ; see Figure 1 with load; R = 50Ω; (RS-422); see Figure 1 with load; R = 27Ω; (RS-485);see Figure 1

0.2

Volts

R = 27Ω or R = 50Ω; see Figure 1

3 0.8 ±10

Volts Volts Volts µA

R = 27Ω or R = 50Ω; see Figure 1 Applies to DE, DI, RE Applies to DE, DI, RE Applies to DE, DI, RE

±250 ±250

mA mA

-7V ≤ VO ≤ +12V -7V ≤ VO ≤ +12V

Mbps

Driver Input to Output

20

30

60

ns

Driver Input to Output (SP485EMN ONLY)

20

30

80

ns

RE = 5V, DE = 5V; RDIFF = 54Ω, CL1 = CL2 = 100pF tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; see Figures 3 and 5 tPLH; RDIFF = 54Ω, CLI = CL2 = 100pF; See Figures 3 and 5

Driver Input to Output

20

30

60

ns

Driver Input to Output (SP485EMN ONLY) Driver Skew

20

30

80

ns

5

10

ns

Driver Rise or Fall Time

3

15

40

ns

40

70

ns

tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; see Figures 3 and 5 tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; see Figures 3 and 5 see Figures 3 and 5, tSKEW = | tDPLH - tDPHL | From 10% to 90%; RDIFF = 54Ω, CL1 = CL2 = 100pF; see Figures 3 & 6 CL = 100pF; see Figures 4 & 6; S2

40

70

ns

CL = 100pF; see Figures 4 & 6; S1

40

70

ns

CL = 100pF; see Figures 4 & 6; S1

40

70

ns

CL = 100pF; see Figures 4 & 6; S2

Driver Enable to Output High closed Driver Enable to Output Low closed Driver Disable Time from Low closed Driver Disable Time from High closed

Rev. 5/16/03

2.0

10

SP481E Low Power Half-Duplex RS485 Transceivers

2

© Copyright 2003 Sipex Corporation

SPECIFICATIONS (continued) TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.

PARAMETERS MIN. SP481E/SP485E RECEIVER DC Characteristics Differential Input Threshold -0.2 Differential Input Threshold -0.4 (SP485EMN ONLY) Input Hysteresis Output Voltage High 3.5 Output Voltage Low Three-State (High Impedance) Output Current Input Resistance 12 Input Current (A, B); VIN = 12V Input Current (A, B); VIN = -7V Short-Circuit Current 7 SP481E/SP485E RECEIVER AC Characteristics Maximum Data Rate 10 Receiver Input to Output 20 Receiver Input to Output

20

Diff. Receiver Skew ItPLH-tPHLI

MAX.

UNITS

CONDITIONS

+0.2 +0.4

Volts Volts

-7V ≤ VCM ≤ +12V -7V ≤ VCM ≤ +12V

0.4

mV Volts Volts

VCM = 0V IO = -4mA, VID = +200mV IO = +4mA, VID = -200mV

+1.0 -0.8 95

µA kΩ mA mA mA

0.4V ≤ VO ≤ 2.4V; RE = 5V -7V ≤ VCM ≤ +12V DE = 0V, VCC = 0V or 5.25V, VIN = 12V DE = 0V, VCC = 0V or 5.25V, VIN = -7V 0V ≤ VO ≤ VCC

45

100

Mbps ns

45

100

ns

RE = 0V, DE = 0V tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 7 tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 7 RDIFF = 54Ω; CL1 = CL2 = 100pF; Figures 3 & 7

20

±1 15

13

Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable from Low Receiver Disable from High SP481E Shutdown Timing Time to Shutdown 50 Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Output Low POWER REQUIREMENTS Supply Voltage +4.75 Supply Current SP481E/485E No Load SP481E Shutdown Mode ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) 0 Industrial (_E_) -40 (_M_) -40 Storage Temperature -65 Package Plastic DIP (_P) NSOIC (_N) Rev. 5/16/03

TYP.

ns

45

70

ns

CRL = 15pF; Figures 2 & 8; S1 closed

45 45 45

70 70 70

ns ns ns

CRL = 15pF; Figures 2 & 8; S2 closed CRL = 15pF; Figures 2 & 8; S1 closed CRL = 15pF; Figures 2 & 8; S2 closed

200

600

ns

RE = 5V, DE = 0V

40

100

ns

CL = 100pF; See Figures 4 & 6; S2 closed

40

100

ns

CL = 100pF; See Figures 4 & 6; S1 closed

300

1000

ns

CL = 15pF; See Figures 2 & 8; S2 closed

300

1000

ns

CL = 15pF; See Figures 2 & 8; S1 closed

+5.25

Volts

900 600

µA µA

RE, DI = 0V or VCC; DE = VCC RE = 0V, DI = 0V or 5V; DE = 0V

10

µA

DE = 0V, RE=VCC

+70 +85 +125 +150

°C °C °C °C

SP481E Low Power Half-Duplex RS485 Transceivers

3

© Copyright 2003 Sipex Corporation

PIN FUNCTION R

Pin 1 – RO – Receiver Output.

8

VCC

RE 2

7

B

DE 3

6

A

5

GND

RO 1

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.

D DI 4

SP485

Pin 6 – A – Driver Output/Receiver Input Non-inverting.

Top View

Pin 7 – B – Driver Output/Receiver Input Inverting.

SP481E and SP485E Pinout (Top View)

Pin 8 – Vcc – Positive Supply 4.75V