ILX485 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers

Size: px

Start display at page:

Download "ILX485 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers"

Britton Harvey
5 years ago
Views:

1 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers General Description The ILX485 is low-power transceivers for RS-485 and RS- 422 communication. I contains one driver and one receiver. The driver slew rates of the ILX485 is not limited, allowing them to transmit up to 2.5Mbps. These transceivers draw between 120µA and 500µA of supply current when unloaded or fully loaded with disabled drivers. All parts operate from a single 5V supply. Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit. The MAX485 is designed for half-duplex applications. Features Low Quiescent urrent: 300µA -7V to +12V ommon-mode Input Voltage Range Three-State Outputs 30ns Propagation Delays, 5ns Skew Full-Duplex and Half-Duplex Versions Available Operate from a Single 5V Supply Allows up to 32 Transceivers on the Bus Data rate: 2,5 Mbps urrent-limiting and Thermal Shutdown for Driver Overload Protection Pinning 1

2 ABSOLUTE MAXIMUM RATINGS Supply Voltage (V) 12V ontinuous Power Dissipation (TA= +70 ) ontrol Input Voltage -0.5V to (V + 0.5V) 8-Pin Plastic DIP (derate 9.09mW/ above +70 ) 727mW Driver Input Voltage (DI) -0.5V to (V+ 0.5V) 8-Pin SO (derate 5.88mW/ above +70 ) 471mW Driver Output Voltage (A, B) -8V to +12.5V Operating Temperature Ranges0 to +70 Receiver Input Voltage (A, B) -8V to +12.5V Storage Temperature Range -65 to +160 Receiver Output Voltage (RO) -0.5V to (V+0.5V) Lead Temperature (soldering, 10sec) +300 D ELETRIAL HARATERISTIS (V = 5V ±5%, T A = T MIN to T MAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL ONDITIONS MIN TYP MAX UNITS Differential Driver Output (no V OD1 5 V load) Differential Driver Output (with load) hange in Magnitude of Driver Differential Output Voltage for omplementary Output States Driver ommon-mode Output Voltage hange in Magnitude of Driver ommon-mode Output Voltage for omplementary Output States V OD2 R = 50 (RS-422) 2 V R = 27 (RS-485), Figure V OD R = 27 or 50, Figure V V O R = 27 or 50, Figure 4 3 V V OD R = 27 or 50, Figure V Input High Voltage V IH DE, DI, RE 2.0 V Input Low Voltage V IL DE, DI, RE 0.8 V Input urrent I IN1 DE, DI, RE ±2 µa Input urrent I IN2 DE = 0V; V IN = 12V 1.0 ma (A, B) V = 0V or 5.25V, V IN = -7V -0.8 Receiver Differential Threshold V TH -7V VM 12V V Voltage Receiver Input Hysteresis V TH V M = 0V 70 mv Receiver Output High Voltage V OH I O = -4mA, VID = 200mV 3.5 V Receiver Output Low Voltage V OL I O = 4mA, VID = -200mV 0.4 V Three-State (high impedance) Output urrent at Receiver I OZR 0.4V V O 2.4V ±1 µa Receiver Input Resistance R IN -7V V M 12V 12 k 2

3 D ELETRIAL HARATERISTIS (continued) (V = 5V ±5%, T A = T MIN to T MAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL ONDITIONS MIN TYP MAX UNITS No-Load Supply urrent (Note 3) I DE = V RE = 0V or V µa DE = 0V Driver Short-ircuit urrent, I OSD1-7V V O 12V (Note 4) ma V O = High Driver Short-ircuit urrent, I OSD2-7V V O 12V (Note 4) ma V O = Low Receiver Short-ircuit urrent I OSR 0V V O V 7 95 ma SWITHING HARATERISTIS (V = 5V ±5%, T A = T MIN to T MAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL ONDITIONS MIN TYP MAX UNITS Driver Input to Output t PLH R DIFF = 54, ns t PHL 1 = 2 = 100pF Driver Output Skew to Output t SKEW R DIFF = 54, L1 = L2 = 100pF 5 10 ns Driver Enable to Output High t ZH = 100pF, S2 closed ns Driver Enable to Output Low t ZL = 100pF, S1 closed ns Driver Disable Time from Low t LZ = 15pF, S1 closed ns Driver Disable Time from High t HZ = 15pF, S2 closed ns tplh - tphl Differential t SKD R DIFF = 54, 13 ns Receiver Skew 1 = 2 = 100pF Receiver Enable to Output Low t ZL = 15pF, S1 closed ns Receiver Enable to Output High t ZH = 15pF, S2 closed ns Receiver Disable Time from t LZ = 15pF, S1 closed ns Low Receiver Disable Time from High t HZ = 15pF, S2 closed ns Maximum Data Rate f MAX 2.5 Mbps 3

4 Operation timing diagrams of ILX 485. Table of ILX 485 operation. Transmission Receipt Inputs Outputs Inputs Outputs RE DE DI Z Y RE DE A-B RO X V 1 X V X Z Z 0 0 open X Z Z 1 0 X Z X-don t care Z-high resistance 4

5 N SUFFIX PLASTIK SOP (MS-012AA) D 8 5 E1 H 1 4 hx45 A1 c e L 0,25 (0,010) b M Note: dimensions D, E1 do not include flash which shall not be more than 0.25 (0.010) per one side. Fig. 9 Package overall dimensions Table 6 Package dimensions D E1 H b e A A1 c L h Mm min max Inch min max

6 D E1 b2 A E A1 e b L c 0,25 (0,010) M Note: D, E1 Dimensions do not include flash wich shall not be more than 0.25 (0.010) per one side Package overall dimensions D E1 A b b2 e L E c A1 Mm min max Inch min max

ILX485. Low-Power, RS-485/RS-422 Transceivers TECHNICAL DATA

ILX485. Low-Power, RS-485/RS-422 Transceivers TECHNICAL DATA TECHNICAL DATA Low-Power, RS-485/RS-422 Transceivers ILX485 Description The ILX485 is low-power transceivers for RS-485 and RS- 422 communication. IC contains one driver and one receiver. The driver slew