3
LTC2847
sn2847 2847fs
The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, VIN = 3.3V, unless otherwise noted (Notes 2, 3)
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V –
Negative Charge Pump Output Voltage
V.28 Mode, No Load
– 9.6
V
V.28 Mode, Full Load
q
– 7.5
– 8.5
V
V.35 Mode
q
– 5.5
– 6.5
V
RS530, RS530-A, X.21 Modes, Full Load
q
– 4.5
– 6.0
V
fOSC
Charge Pump Oscillator Frequency
500
kHz
tr
Charge Pump Rise Time
No-Cable Mode/Power-Off to Normal Operation
2
ms
Logic Inputs and Outputs
VIH
Logic Input High Voltage
D1, D2, D3, M0, M1, M2, DCE/DTE
q
2.0
V
VIL
Logic Input Low Voltage
D1, D2, D3, M0, M1, M2, DCE/DTE
q
0.8
V
IIN
Logic Input Current
D1, D2, D3
q
±10
A
M0, M1, M2, DCE/DTE = GND
q
– 30
– 75
– 120
A
M0, M1, M2, DCE/DTE = VIN
q
±10
A
VOH
Output High Voltage
IO = – 3mA
q
2.7
3
V
VOL
Output Low Voltage
IO = 1.6mA
q
0.2
0.4
V
IOSR
Output Short-Circuit Current
0V
≤ VO ≤ VIN
q
±50
mA
IOZR
Three-State Output Current
M0 = M1 = M2 = VIN, VO = GND
q
–30
–85
–160
A
M0 = M1 = M2 = VIN, VO = VIN
q
±10
A
V.11 Driver
VODO
Open Circuit Differential Output Voltage
RL = 1.95k (Figure 1)
q
± 5V
VODL
Loaded Differential Output Voltage
RL = 50 (Figure 1)
0.5VODO
0.67VODO
V
RL = 50 (Figure 1)
q
±2V
VOD
Change in Magnitude of Differential
RL = 50 (Figure 1)
q
0.2
V
Output Voltage
VOC
Common Mode Output Voltage
RL = 50 (Figure 1)
q
3V
VOC
Change in Magnitude of Common Mode
RL = 50 (Figure 1)
q
0.2
V
Output Voltage
ISS
Short-Circuit Current
VOUT = GND
±150
mA
IOZ
Output Leakage Current
VA and VB ≤ 0.25V, Power Off or
q
± 1
±100
A
No-Cable Mode or Driver Disabled
tr, tf
Rise or Fall Time
(Figures 2, 13)
q
215
25
ns
tPLH
Input to Output Rising
(Figures 2, 13)
q
15
40
65
ns
tPHL
Input to Output Falling
(Figures 2, 13)
q
15
40
65
ns
t
Input to Output Difference,
tPLH – tPHL (Figures 2, 13)
q
03
12
ns
tSKEW
Output to Output Skew
(Figures 2, 13)
3
ns