ISL31480E_10 Datasheet, PDF (11/24 Pages) Intersil Corporation – Fault Protected, Extended CMR, RS-485/RS-422 Transceivers with Cable Invert

ISL31480E, ISL31483E, ISL31485E, ISL31486E
Electrical Specifications Test Conditions: V_CC = 4.5V to 5.5V, V_L = V_CC; Unless Otherwise Specified. Typicals are at
V_CC = 5V, T_A = +25°C (Note 8). Boldface limits apply over the operating temperature
range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP MIN
MAX
(°C) (Note 16) TYP (Note 16) UNITS
Receiver Skew | t_PLH -
t_PHL |
Receiver Enable to
Output Low
t_SKD
t_ZL
(Figure 5)
R_L = 1kΩ, C_L = 15pF, SW = V_CC
(Figure 6), (Notes 12, 19)
Full
-
Full
-
4
10
ns
-
50
ns
Receiver Enable to
Output High
t_ZH
R_L = 1kΩ, C_L = 15pF, SW = GND
Full
-
(Figure 6), (Notes 12, 19)
-
50
ns
Receiver Disable from
Output Low
t_LZ
R_L = 1kΩ, C_L = 15pF, SW = V_CC
(Figure 6) (Note 19)
Full
-
-
50
ns
Receiver Disable from
Output High
t_HZ
R_L = 1kΩ, C_L = 15pF, SW = GND
Full
-
(Figure 6) (Note 19)
-
50
ns
Time to Shutdown
t_SHDN (Notes 13, 19)
Receiver Enable from
t_ZH(SHDN) R_L = 1kΩ, C_L = 15pF, SW = GND
Shutdown to Output High
(Figure 6), (Notes 13, 15, 19)
Full
60
160
600
ns
Full
-
-
2000
ns
Receiver Enable from
t_ZL(SHDN) R_L = 1kΩ, C_L = 15pF, SW = V_CC
Shutdown to Output Low
(Figure 6), (Notes 13, 15, 19)
Full
-
-
2000
ns
NOTES:
8. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device
ground unless otherwise specified.
9. Supply current specification is valid for loaded drivers when DE = 0V.
10. Applies to peak current. See “Typical Performance Curves” beginning on page 18 for more information
11. Keep RE = 0 to prevent the device from entering SHDN.
12. The RE signal high time must be short enough (typically <100ns) to prevent the device from entering SHDN.
13. Transceivers (except on the ISL31485E) are put into shutdown by bringing RE high and DE low. If the inputs are in this state
for less than 60ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts
are guaranteed to have entered shutdown. See “Low Power Shutdown Mode” on page 17.
14. Keep RE = VCC, and set the DE signal low time >600ns to ensure that the device enters SHDN.
15. Set the RE signal high time >600ns to ensure that the device enters SHDN.
16. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established
by characterization and are not production tested.
17. See Figure 9 for more information, and for performance over-temperature.
18. Tested according to TIA/EIA-485-A, Section 4.2.6 (±80V for 15ms at a 1% duty cycle).
19. Does not apply to the ISL31485E. The ISL31485E has no Rx enable function, and thus no SHDN function.
20. See “Caution” statement in the “Recommended Operating Conditions” section on page 9.
Test Circuits and Waveforms
V_L OR V_CC ^DE
DI
Z
D
Y
V_OD
R_L/2
R_L/2 VOC
V_L OR ^DE
V_{CC DI}
Z
D
Y
R_L/2
375Ω
V_OD
V_OC
R_L/2
V_CM
375Ω
FIGURE 1A. V_OD AND V_OC
FIGURE 1. DC DRIVER TEST CIRCUITS
FIGURE 1B. 1B
11
FN7638.0
June 25, 2010