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