ISL31480E_11 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 Disable from Output
t_LZ
R_L = 1kΩ, C_L = 15pF, SW = V_CC (Figure 8)
Full
-
Low
(Note 18)
-
50
ns
Receiver Disable from Output
t_HZ
R_L = 1kΩ, C_L = 15pF, SW = GND (Figure 8)
Full
-
High
(Note 18)
-
50
ns
Time to Shutdown
t_SHDN (Notes 13, 18)
Full
60
160
600
ns
Receiver Enable from
t_ZH(SHDN) R_L = 1kΩ, C_L = 15pF, SW = GND (Figure 8),
Full
-
Shutdown to Output High
(Notes 13, 15, 18)
-
2000
ns
Receiver Enable from
t_ZL(SHDN) R_L = 1kΩ, C_L = 15pF, SW = V_CC (Figure 8),
Full
-
Shutdown to Output Low
(Notes 13, 15, 18)
-
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 16.
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. Tested according to TIA/EIA-485-A, Section 4.2.6 (±80V for 15ms at a 1% duty cycle).
18. Does not apply to the ISL31485E. The ISL31485E has no Rx enable function, and thus no SHDN function.
19. See “Caution” statement under the “Recommended Operating Conditions” section on page 8.
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
V_OD
V_OC
R_L/2
375Ω
V_CM
375Ω
FIGURE 3A. V_OD AND V_OC
FIGURE 3. DC DRIVER TEST CIRCUITS
FIGURE 3B. 1B
11
FN7638.2