ISL81487 Intersil Corporation, ISL81487 Datasheet - Page 6

• Manufacturer Part Number: ISL81487
• Description: 1/8 Unit Load, 5v, Low Power, High Speed or Slew Rate Limited, Rs-485/rs-422 Transceivers
• Manufacturer: Intersil Corporation

Electrical Specifications
NOTES:
Test Circuits and Waveforms
10. Devices meeting these limits are denoted as “1/8 unit load (1/8 UL)” transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus,
11. Devices meeting these limits are denoted as “1/4 unit load (1/4 UL)” transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus,
Driver Enable from Shutdown to
Output High
Driver Enable from Shutdown to
Output Low
Receiver Enable from Shutdown to
Output High
Receiver Enable from Shutdown to
Output Low
2. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless
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 the ISL8487 and ISL81483, keep RE = 0 to prevent the device from entering SHDN.
6. When testing the ISL8487 and ISL81483, the RE signal high time must be short enough (typically <200ns) to prevent the device from entering
7. The ISL8487 and ISL81483 are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns, the parts are
8. Keep RE = V
9. Set the RE signal high time >600ns to ensure that the device enters SHDN.
otherwise specified.
SHDN.
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” section.
so there can be 256 1/8 UL devices on a bus.
so there can be 128 1/4 UL devices on a bus.
PARAMETER
CC
, and set the DE signal low time >600ns to ensure that the device enters SHDN.
6
Test Conditions: V
(Note 2) (Continued)
t
t
t
t
SYMBOL
ZH(SHDN)
ZH(SHDN)
ZL(SHDN)
ZL(SHDN)
V
CC
DE
DI
ISL8487, ISL81483, ISL81487
C
C
C
C
L
L
L
L
CC
= 100pF, SW = GND, (Figure 3, Notes 7, 8)
= 100pF, SW = V
= 15pF, SW = GND, (Figure 5, Notes 7, 9)
= 15pF, SW = V
FIGURE 1. DRIVER V
D
= 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at V
Y
Z
TEST CONDITIONS
CC
V
CC
OD
, (Figure 5, Notes 7, 9)
, (Figure 3, Notes 7, 8)
OD
AND V
R
R
OC
V
OC
TEMP
(
Full
Full
Full
Full
o
C)
MIN
-
-
-
-
CC
1000
1000
TYP
800
800
= 5V, T
A
MAX
2000
2000
2500
2500
= 25
o
C,
UNITS
ns
ns
ns
ns