LT1237_15 datasheet(3/8 Pages) LINER

Part #	LT1237

Description	5V RS232 Transceiver with Advanced Power Management and One Receiver Active in Shutdown

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Manufacturer	LINER [Linear Technology]

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LT1237

ELECTRICAL C

C

HARA TERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Any Driver

Output Voltage Swing

Load = 3k to GND

Positive

q

5.0

7.5

V

Negative

q

– 6.3

– 5.0

V

Logic Input Voltage Level

Input Low Level (VOUT = High)

q

1.4

0.8

V

Input High Level (VOUT = Low)

q

2.0

1.4

V

Logic Input Current

0.8V

≤ VIN ≤ 2V

q

520

µA

Output Short-Circuit Current

VOUT = 0V

±917

mA

Output Leakage Current

Shutdown VOUT = ±30V (Note 4)

q

10

100

µA

Data Rate (Note 7)

RL = 3k, CL = 2500pF

120

kBaud

RL = 3k, CL = 1000pF

250

kBaud

Slew Rate

RL = 3k, CL = 51pF

15

30

V/

µs

RL = 3k, CL = 2500pF

4

7

V/

µs

Propagation Delay

Output Transition tHL High to Low (Note 5)

0.6

1.3

µs

Output Transition tLH Low to High

0.5

1.3

µs

Any Receiver

Input Voltage Thresholds

Input Low Threshold (VOUT = High)

0.8

1.3

V

Input High Threshold (VOUT = Low)

1.7

2.4

V

Hysteresis

q

0.1

0.4

1.0

V

Input Resistance

VIN = ±10V

3

5

7

k

Ω

Output Leakage Current

Shutdown (Note 4) 0

≤ VOUT ≤ VCC

q

110

µA

Receivers 1, 2, 3, 4

Output Voltage

Output Low, IOUT = – 1.6mA

q

0.2

0.4

V

Output High, IOUT = 160µA (VCC = 5V)

q

3.5

4.2

V

Output Short-Circuit Current

Sinking Current, VOUT = VCC

–10

– 20

mA

Sourcing Current, VOUT = 0V

10

20

mA

Propagation Delay

Output Transition tHL High to Low (Note 6)

250

600

ns

Output Transition tLH Low to High

350

600

ns

Receiver 5 (LOW ISUPPLY RX)

Output Voltage

Output Low, IOUT = – 500µA

q

0.2

0.4

V

Output High, IOUT = 160µA (VCC = 5V)

q

3.5

4.2

V

Output Short-Circuit Current

Sinking Current, VOUT = VCC

–2

–4

mA

Sourcing Current, VOUT = 0V

2

4

mA

Propagation Delay

Output Transition tHL High to Low (Note 6)

1.0

3

µs

Output Transition tLH Low to High

0.6

3

µs

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: Testing done at VCC = 5V and VON/OFF = 3V, unless otherwise

specified.

Note 3: Supply current is measured as the average over several charge

pump burst cycles. C+ = 1.0

µF, C– = 0.1µF, C1 = C2 = 0.2µF. All outputs

are open, with all driver inputs tied high.

Note 4: Measurements in shutdown are performed with VON/OFF ≤ 0.1V.

Supply current measurements using driver disable are performed with

VDRIVER DISABLE ≥ 3V.

Note 5: For driver delay measurements, RL = 3k and CL = 51pF. Trigger

points are set between the driver’s input logic threshold and the output

transition to the zero crossing (tHL = 1.4V to 0V and tLH = 1.4V to 0V).

Note 6: For receiver delay measurements, CL = 51pF. Trigger points are

set between the receiver’s input logic threshold and the output transition

to standard TTL/CMOS logic threshold (tHL = 1.3V to 2.4V and tLH = 1.7V

to 0.8V).

Note 7: Data rate operation guaranteed by slew rate, short-circuit current

and propagation delay tests.

The q denotes specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. (Note 2)

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