ISL43485_05 Datasheet, PDF (5/11 Pages) Intersil Corporation – 3.3V, Low Power, 30Mbps, RS-485/RS-422 Transceiver

ISL43485
Electrical Specifications Test Conditions: V_CC = 3V to 3.6V; Unless Otherwise Specified. Typicals are at V_CC = 3.3V, T_A = 25°C,
Note 2 (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(°C) MIN
TYP MAX UNITS
Time to Shutdown
t_SHDN (Note 7)
Receiver Enable from Shutdown to t_ZH(SHDN) R_L = 1kΩ, C_L = 15pF, SW = GND (Figure 5),
Output High
(Notes 7, 9)
Full 80
190 300
ns
Full
-
240 400 ns
Receiver Enable from Shutdown to t_ZL(SHDN) R_L = 1kΩ, C_L = 15pF, SW = V_CC (Figure 5),
Output Low
(Notes 7, 9)
Full
-
240 400 ns
NOTES:
2. 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.
3. Supply current specification is valid for loaded drivers when DE = 0V.
4. Applies to peak current. See “Typical Performance Curves” for more information.
5. When testing this parameter, keep RE = 0 to prevent the device from entering SHDN.
6. When testing this parameter, the RE signal high time must be short enough (typically <100ns) to prevent the device from entering SHDN.
7. The ISL43485 is put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns, the parts are guaranteed
not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to have entered shutdown. See “Low-Power
Shutdown Mode” section.
8. Keep RE = VCC, and set the DE signal low time >300ns to ensure that the device enters SHDN.
9. Set the RE signal high time >300ns to ensure that the device enters SHDN.
Test Circuits and Waveforms
V_CC ^DE
DI
Z
D
Y
V_OD
R_L/2
R_L/2 VOC
V_CC ^DE
DI
Z
D
Y
V_OD
375Ω
R_L = 60Ω
V_CM
-7V TO +12V
375Ω
FIGURE 1A. V_OD AND V_OC
FIGURE 1B. V_OD WITH COMMON MODE LOAD
FIGURE 1. DC DRIVER TEST CIRCUITS
5
FN6071.1
March 15, 2005