LTC485
3
485fm
For more information www.linear.com/LTC485
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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.
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V ±5%, unless otherwise noted. (Notes 2 and 3)
SWITCHING CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V ±5%, unless otherwise noted. (Notes 2 and 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ICC Supply Current No Load, Pins 2, 3, 4 = 0V or 5V Outputs Enabled
Outputs Disabled
l
l
500
300
900
500
μA
μA
IOSD1 Driver Short-Circuit Current, VOUT = HIGH VO = – 7V l 35 100 250 mA
IOSD2 Driver Short-Circuit Current, VOUT = LOW VO = 10V l 35 100 250 mA
IOSR Receiver Short-Circuit Current 0V ≤ VO ≤ VCC l 7 85 mA
tPLH Driver Input to Output RDIFF = 54Ω, CL1 = CL2 = 100pF,
(Figures 3 and 5)
l 10 30 50 ns
tPHL Driver Input to Output l 10 30 50 ns
tSKEW Driver Output to Output l 5 10 ns
tr, tf Driver Rise or Fall Time l3 15 25 ns
tZH Driver Enable to Output High CL = 100pF (Figures 4 and 6) S2 Closed l40 70 ns
tZL Driver Enable to Output Low CL = 100pF (Figures 4 and 6) S1 Closed l40 70 ns
tLZ Driver Disable Time from Low CL = 15pF (Figures 4 and 6) S1 Closed l 40 70 ns
tHZ Driver Disable Time from High CL = 15pF (Figures 4 and 6) S2 Closed l40 70 ns
tPLH Receiver Input to Output RDIFF = 54Ω, CL1 = CL2 = 100pF,
(Figures 3 and 7)
l30 90 200 ns
tPHL l30 90 200 ns
tSKD |tPLH – tPHL| Differential Receiver Skew l 13 ns
tZL Receiver Enable to Output Low CRL = 15pF (Figures 2 and 8) S1 Closed l 20 50 ns
tZH Receiver Enable to Output High CRL = 15pF (Figures 2 and 8) S2 Closed l20 50 ns
tLZ Receiver Disable from Low CRL = 15pF (Figures 2 and 8) S1 Closed l20 50 ns
tHZ Receiver Disable from High CRL = 15pF (Figures 2 and 8) S2 Closed l20 50 ns
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIH Input High Voltage DE, DI, RE l 2 V
VIL Input Low Voltage DE, DI, RE l 0.8 V
IIN1 Input Current DE, DI, RE l ±2 μA
IIN2 Input Current (A, B) DE = 0, VCC = 0V or 5.25V VIN = 12V
C-, I-Grade VIN = –7V
l
l
1
–0.8
mA
mA
M-Grade VIN = 12V
VIN = –7V
l
l
2
–1.6
mA
mA
VTH Differential Input Threshold Voltage for Receiver –7V ≤ VCM ≤ 12V l –0.2 0.2 V
ΔVTH Receiver Input Hysteresis VCM = 0V l 70 mV
VOH Receiver Output High Voltage IO = –4mA, VID = 200mV l 3.5 V
VOL Receiver Output Low Voltage IO = 4mA, VID = –200mV l0.4 V
IOZR Three-State (High Impedance) Output Current
at Receiver
VCC = Max, 0.4V ≤ VO ≤ 2.4V l ±1 μA
RIN Receiver Input Resistance –7V ≤ VCM ≤ 12V (C-, I-Grade)
(M-Grade)
l
l
12
6
kΩ
kΩ
Note 3: All typicals are given for VCC = 5V and TA = 25°C.
Note 4: The LTC485 is guaranteed by design to be functional over a supply
voltage range of 5V ±10%. Data sheet parameters are guaranteed over the
tested supply voltage range of 5V ±5%.