LT1080, LT1081
ADVANCED LOW-POWER
5-V DUAL EIA-232 DRIVER/RECEIVERS
SLLS050A – D3121, SEPTEMBER 1989 – REVISED FEBRUARY 1991
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature, V
I
= 3 V (unless otherwise noted)
driver section
PARAMETER
VOM +
VOM –
IIH
IIL
IOHS
IOLS
IOZ
Positive-peak output voltage
Negative-peak output voltage
High-level input current
Low-level input current
Output short-circuit current (sourcing)
Output short-circuit current (sinking)
High-impedance output current
TEST CONDITIONS
RL = 3 kΩ to GND
RL = 3 kΩ to GND
VI = 2 V to 5.5 V
VI
≤
0.8 V
VI = 0,
VI = 2 V,
Shutdown mode,
VO = 0,
VO = 0,
VO =
±
30 V
TA = 25°C
TA = 25°C
–7
7
MIN
5
–5
TYP†
7.5
– 6.5
5
–5
12
– 12
100
20
– 20
MAX
UNIT
V
V
µA
µA
mA
mA
µA
receiver section
PARAMETER
VT +
VT –
Vhys
ri
VOH
VOL
IOSH
IOSL
IOZ
Positive-going
Positive going input threshold voltage
Negative-going
Negative going input threshold voltage
Input hysteresis
Input resistance
High-level output voltage
Low-level output voltage
Output short-circuit current (sourcing)
Output short-circuit current (sinking)
High-impedance output current
TA = 25°C
IOH = – 160
µA,
IOL = 1.6 mA
VI = 3 V,
VI = 3 V,
Shutdown mode,
VCC = 5 V
VO = 0,
VO = VCC,
VO = 0 to VCC
TA = 25°C
TA = 25°C
TEST CONDITIONS
LT1080C, LT1081C
LT1080I, LT1081I
LT1080C, LT1081C
LT1080I, LT1081I
0.8
0.2
0.1
3
3.5
– 0.6
10
MIN
TYP†
1.7
1.7
1.3
1.3
0.4
5
4.8
0.2
–1
20
10
0.4
1
7
MAX
2.4
3
UNIT
V
V
V
kΩ
V
V
mA
mA
µA
power supply section, V
CC
= 5 V, driver outputs low (unless otherwise noted)
PARAMETER
VS +
Supply output voltage
IS = 0,
IS = 10 mA,
IS = 15 mA,
IS = 0,
VS –
ICC
ICC(off)
II
Supply output voltage
Supply current
Off-state supply current (LT1080)
Input current (ON/OFF) (LT1080)
ON/OFF at 0.4 V
VI = 5 V
VI = 0 V
IS = 10 mA,
IS = 15 mA,
TEST CONDITIONS
TA = 25°C
TA = 25°C
TA = 25°C
TA = 25°C
TA = 25°C
TA = 25°C
MIN
8
7
6.5
– 7.5
– 5.5
–5
TYP†
9
8
7.5
– 8.5
– 6.5
–6
10
22
100
80
– 15
mA
µA
µA
V
V
MAX
UNIT
† All typical values are at VCC = 5 V, TA = 25°C.
operating characteristics over recommended range of supply voltage, V
I
= 3 V, T
A
= 25
°
C
PARAMETER
SR
Driver slew rate
TEST CONDITIONS
RL = 3 kΩ to 7 kΩ,
CL = 560 pF,
See Note 2
MIN
4
TYP
15
MAX
30
UNIT
V/µs
tr(supply)
Supply rise time (see Note 3)
C1 – C4 = 1
µF
1
ms
NOTES: 2. Meets EIA-232-D specifications for capacitive loads greater than 560 pF.
3. Time from either shutdown input ON/OFF (LT1080) goes active high or VCC power on (LT1081) until the output voltages reach
VS+
≥
6 V and VS –
≤
– 6 V.
2–4
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•
DALLAS, TEXAS 75265
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