ISL4485E Datasheet, PDF (4/11 Pages) Intersil Corporation – ±15kV ESD Protected, 20Mbps, 5V, Low Power, RS-485/RS-422 Transceiver

ISL4485E
Electrical Specifications
Test Conditions: V_CC
Typicals are at V_CC =
= 4.5V
5V, T_A
to
=
5.5V; Unless
25^oC, Note 2
Otherwise Specified.
(Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(^oC) MIN TYP MAX UNITS
SWITCHING CHARACTERISTICS
Driver Input to Output Delay
t_PLH, t_PHL R_DIFF = 54Ω, C_L = 100pF, (Figure 2)
Driver Output Skew
t_SKEW R_DIFF = 54Ω, C_L = 100pF, (Figure 2)
Driver Differential Rise or Fall Time t_R, t_F R_DIFF = 54Ω, C_L = 100pF, (Figure 2)
Driver Enable to Output High
t_ZH
C_L = 100pF, SW = GND, (Figure 3)
Driver Enable to Output Low
t_ZL
C_L = 100pF, SW = V_CC, (Figure 3)
Driver Disable from Output High
t_HZ
C_L = 15pF, SW = GND, (Figure 3)
Driver Disable from Output Low
t_LZ
C_L = 15pF, SW = V_CC, (Figure 3)
Driver Maximum Data Rate
f_MAXD V_OD ≥ 1.5V , (Figure 4, Note 6)
Receiver Input to Output Delay
t_PLH, t_PHL Figure 5
Receiver Skew | t_PLH - t_PHL |
t_SKD Figure 5
Receiver Enable to Output High
t_ZH
C_L = 15pF, SW = GND, (Figure 6)
Receiver Enable to Output Low
t_ZL
C_L = 15pF, SW = V_CC, (Figure 6)
Receiver Disable from Output High
t_HZ
C_L = 15pF, SW = GND, (Figure 6)
Receiver Disable from Output Low
t_LZ
C_L = 15pF, SW = V_CC, (Figure 6)
Receiver Maximum Data Rate
f_MAXR C_L = 15pF, V_ID ≥ 1.5V (Note 6)
ESD PERFORMANCE
Full 15
30
50
ns
Full
-
1.3
5
ns
Full
3
11
25
ns
Full
-
17
30
ns
Full
-
14
30
ns
Full
-
19
30
ns
Full
-
13
30
ns
Full 20
-
-
Mbps
Full 20
40
70
ns
Full
-
3
10
ns
Full
-
9
25
ns
Full
-
9
25
ns
Full
-
9
25
ns
Full
-
9
25
ns
Full 20
-
-
Mbps
RS-485 Pins (A/Y, B/Z)
Human Body Model
25
-
±15
-
kV
All Other Pins
25
-
>±7
-
kV
NOTE:
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. Devices meeting these limits are denoted as “single unit load (1 UL)” transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus.
6. Guaranteed by characterization, but not tested.
Test Circuits and Waveforms
V_CC ^DE
DI
Z
D
Y
V_OD
R
R
V_OC
FIGURE 1. DRIVER V_OD AND V_OC
4