Anterwell Technology Ltd.
Anterwell Technology Ltd.
Large Original stock of IC Electronics Components, Transistors, Diodes etc.
High Quality, Reasonable Price, Fast Delivery.
Anterwell Technology Ltd.
Large Original stock of IC Electronics Components, Transistors, Diodes etc.
High Quality, Reasonable Price, Fast Delivery.
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| Supply Voltage (VCC): | 7V | Control Input Voltage (RE, DE): | –0.3 V T O 7 V |
|---|---|---|---|
| Driver Input Voltage (DI): | –0.3 V To 7 V | Driver Output Voltage (A, B, Y, Z): | –7.5 V To 12 V |
| Receiver Input Voltage (A, B): | –7.5 V To 12 V | ||
| Highlight: | programming ic chips,ic programmer circuit |
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3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
General Description
The MAX3483, MAX3485, MAX3486, MAX3488, MAX3490, and MAX3491 are 3.3V, low-power transceivers for RS-485 and RS-422 communication. Each part contains one driver and one receiver. The MAX3483 and MAX3488 feature slew-rate-limited drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps. The partially slew-rate-limited MAX3486 transmits up to 2.5Mbps. The MAX3485, MAX3490, and MAX3491 transmit at up to 10Mbps. 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 both inputs are open circuit. The MAX3488, MAX3490, and MAX3491 feature fullduplex communication, while the MAX3483, MAX3485, and MAX3486 are designed for half-duplex communication.
Applications
Low-Power RS-485/RS-422 Transceivers Telecommunications Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks
Driver Output Protection
Excessive output current and power dissipation caused by faults or by bus contention are prevented by two mechanisms. A foldback current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see Typical Operating Characteristics). In addition, a thermal shutdown circuit forces the driver outputs into a high-impedance state if the die temperature rises excessively.
Propagation Delay
Figures 15–18 show the typical propagation delays. Skew time is simply the difference between the low-to-high and high-to-low propagation delay. Small driver/receiver skew times help maintain a symmetrical mark-space ratio (50% duty cycle).
The receiver skew time, |tPRLH - tPRHL|, is under 10ns (20ns for the MAX3483/MAX3488). The driver skew times are 8ns for the MAX3485/MAX3490/MAX3491, 11ns for the MAX3486, and typically under 100ns for the MAX3483/MAX3488.
| PARAMETER | SYMBOL | CONDITIONS | MIN | TYP | MAX | UNITS |
| Driver Differential Output Delay | tDD | RL = 60Ω, Figure 7 | 600 | 900 | 1400 | ns |
| Driver Differential Output Transition Time | tTD | RL = 60Ω, Figure 7 | 400 | 700 | 1200 | ns |
| Driver Propagation Delay, Low-to-High Level | tPLH | RL = 27Ω, Figure 8 | 700 | 1000 | 1500 | ns |
| Driver Propagation Delay, High-to-Low Level | tPHL | RL = 27Ω, Figure 8 | 700 | 1000 | 1500 | ns |
| tPLH - tPHL| Driver Propagation Delay Skew (Note 2) | tPDS | RL = 27Ω, Figure 8 | 100 | ns | ||
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