IL485W
Driver Section
Electrical specifications are Tmin to Tmax and VDD = 4.5 V to = 5.5 V unless otherwise stated.
Parameters
Input Clamp Voltage
Symbol
VIK
Min.
Typ.(5)
Max.
−1.5
Units
V
Test Conditions
IL = −18 mA
Output voltage
VO
0
6
6
5
5
V
V
V
V
IO = 0
IO = 0
Differential Output Voltage(2)
Differential Output Voltage(2)
Differential Output Voltage(2)(6)
Change in Magnitude of Differential
Output Voltage(7)
|VOD1
|VOD2
VOD3
|
|
1.5
1.5
1.5
2.5
RL = 54 Ω, VDD = 5 V
RL = 54 Ω, VDD = 4.5 V
Δ|VOD|
VOC
±0.2
V
V
RL = 54 Ω or 100 Ω
RL = 54 Ω or 100 Ω
RL = 54 Ω or 100 Ω
3
−1
Common Mode Output Voltage
Change in Magnitude of Common
Mode Output Voltage(7)
Output Current(4) Output Disabled
Δ|VOC|
IO
±0.2
V
1
−0.8
10
−10
250
−150
−250
VO = 12 V
VO = −7 V
VI = 3.5 V
VI = 0.4 V
VO = −6 V
VO = 0 V
VO = 8 V
No Load
(Outputs Enabled)
mA
High Level Input Current
Low Level Input Current
IIH
IIL
μA
μA
Short-circuit Output Current
Supply Current
IOS
IDD1
mΑ
4
6
mA
Switching Specifications
Parameters
Maximum Data Rate
Symbol
Min.
35
Typ.(5)
Max.
Units
Mbps
ns
ns
ns
ns
ns
ns
ns
Test Conditions
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
Differential Output Prop Delay
tD(OD)
tS(P)
tT(OD)
tPZH
tPZL
tPHZ
16
1
8
31
22
28
16
2
25
6
Pulse Skew(10)
Differential Output Rise & Fall Time
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
Skew Limit(3)
10
65
35
50
32
12
tPLZ
tSK(LIM)
ns
Notes (apply to both driver and receiver sections):
1. All voltage values are with respect to network ground except differential I/O bus voltages.
2. Differential input/output voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
3. Skew limit is the maximum propagation delay difference between any two devices at 25°C.
4. The power-off measurement in ANSI Standard EIA/TIA-422-B applies to disabled outputs only and
is not applied to combined inputs and outputs.
5. All typical values are at VDD1,VDD2 = 5 V or VDD1= 3.3 V and TA = 25°C.
6. The minimum VOD2 with a 100 Ω load is either ½ VOD1 or 2 V, whichever is greater.
7. Δ|VOD| and Δ|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from one logic state to
the other.
8. This applies for both power on and power off, refer to ANSI standard RS-485 for exact condition.
The EIA/TIA-422-B limit does not apply for a combined driver and receiver terminal.
9. Includes 8 ns read enable time. Maximum propagation delay is 25 ns after read assertion.
10. Pulse skew is defined as |tPLH – tPHL| of each channel.
11. The relevant test and measurement methods are given in the Electromagnetic Compatibility section on p. 6.
12. External magnetic field immunity is improved by this factor if the field direction is “end-to-end” rather than to “pin-to-pin” (see diagram on p. 6).
4
RHOPOINT [ RHOPOINT COMPONENTS ]
