List of figures

Figure 1.

Pin connections ................................................................... 2

Figure 2.

Driver differential output voltage with common-mode load ...................................... 8

Figure 3.

Driver differential and common-mode output with RS-485 load ................................... 8

Figure 4.

Driver differential output rise and fall times and propagation delays ................................ 8

Figure 5.

Driver enable and disable times with active high output and pull-down load .......................... 9

Figure 6.

Driver enable and disable times with active low output and pull-up load ............................. 9

Figure 7.

Receiver output rise and fall times and propagation delay ...................................... 9

Figure 8.

Receiver enable/disable times with driver enabled........................................... 10

Figure 9.

Receiver enable/disable times with driver disabled .......................................... 10

Figure 10.

Short-circuit output current measurement................................................. 10

Figure 11.

Typical half-duplex RS485 network ..................................................... 11

Figure 12.

Driver output voltage vs. driver output current @ VCC = 5 V .................................... 12

Figure 13.

Driver differential output voltage vs. driver output current @ VCC = 5 V ............................ 12

Figure 14.

Receiver output vs. input @ VCC = 5.5 V ................................................. 12

Figure 15.

Driver output voltage vs. driver output current @ VCC = 3.3 V ................................... 12

Figure 16.

Driver differential output voltage vs. driver output current @ VCC = 3.3 V ........................... 13

Figure 17.

Receiver output vs. input @ VCC = 3 V .................................................. 13

Figure 18.

Driver output current vs. power supply with RL=54Ω ......................................... 13

Figure 19.

Supply current vs. data rate .......................................................... 13

Figure 20.

Shutdown supply current vs. temperature, DE = GND, RE = VCC, @ VCC = 3.3 V and VCC = 5 V .......... 14

Figure 21.

No-load supply current vs. temperature, DE = GND, RE = GND, @ VCC = 3.3 V and VCC = 5 V ........... 14

Figure 22.

No-load supply current vs. temperature, DE = VCC, RE = VCC, @ VCC = 3.3 and VCC = 5 V .............. 14

Figure 23.

No-load supply current vs. temperature, DE = VCC, RE = GND, @ VCC = 3.3 V and VCC = 5 V ............ 14

Figure 24.

Differential driver output voltage vs. temperature............................................ 15

Figure 25.

Driver rise and fall times vs. temperature @ VCC = 5.5 V ...................................... 15

Figure 26.

Driver propagation delay vs. temperature @ VCC = 5.5 V ...................................... 15

Figure 27.

Driver rise and fall times vs. temperature @ VCC = 3 V ....................................... 15

Figure 28.

Driver propagation delay vs. temperature @ VCC = 3 V ....................................... 15

Figure 29.

Receiver propagation delay vs. temperature, with CL = 20 pF ................................... 15

Figure 30.

Eye diagram @ VCC = 5 V, data rate 40 Mbps, d=0.1m ....................................... 16

Figure 31.

Eye diagram @ VCC = 5 V, data rate 40 Mbps, d=3m......................................... 16

Figure 32.

Shutdown supply current vs. temperature, DE = GND, RE = VCC, @ VCC = 3.3 V and VCC = 5 V .......... 17

Figure 33.

No-load supply current vs. temperature, DE = GND, RE = GND, @ VCC = 3.3 V and VCC = 5 V ........... 17

Figure 34.

No-load supply current vs. temperature, DE = VCC, RE = VCC, @ VCC = 3.3 and VCC = 5 V .............. 17

Figure 35.

No-load supply current vs. temperature, DE = VCC, RE = GND, @ VCC = 3.3 V and VCC = 5 V ............ 17

Figure 36.

Differential driver output voltage vs. temperature............................................ 18

Figure 37.

Driver rise and fall times vs. temperature @ VCC = 5.5 V ...................................... 18

Figure 38.

Driver propagation delay vs. temperature @ VCC = 5.5 V ...................................... 18

Figure 39.

Driver rise and fall times vs. temperature @ VCC = 3 V ....................................... 18

Figure 40.

Driver propagation delay vs. temperature @ VCC = 3 V ....................................... 18

Figure 41.

Receiver propagation delay vs. temperature, with CL = 20 pF ................................... 18

Figure 42.

Eye diagram @ VCC = 5 V, data rate 16 Mbps, d=3m......................................... 19

Figure 43.

Eye diagram @ VCC = 5 V, data rate 16 Mbps, d=80m........................................ 19

Figure 44.

Block diagram ................................................................... 20

Figure 45.

Hot-swap management with DE rising high before and after VCC................................. 22

Figure 46.

HBM JEDEC (left) and IEC61000-4-2 (right) generator simplified schematics ........................ 22

Figure 47.

HBM JEDEC (left) and IEC61000-4-2 (right) pulses .......................................... 23

Figure 48.

SO8 package outline ............................................................... 24

Figure 49.

SO8 recommended footprint (mm) ..................................................... 25

ST4E1216, ST4E1240

List of figures

DS14542 - Rev 2

page 30/31