DS232AS datasheet(5/10 Pages) DALLAS

5 / 10 page

DS232A

5 of 10

DC ELECTRICAL CHARACTERISTICS (continued)

°C to 70°C)

RS-232 Receivers

RS-232 Input Voltage Operating Range

VIR

±25

±30

RS-232 Input Threshold Low

VRTL

0.8

1.3

RS-232 Input Threshold High

VRTH

1.8

2.4

RS-232 Input Hysteresis

VHY

0.2

0.5

RS-232 Input Resistance

RIN

Ω

TTL/CMOS Output Voltage Low

VROL

0.2

0.4

TTL/CMOS Output Voltage High

VROH

3.5

VCC-0.2

TTL/CMOS Output Short Circuit

Current (VOUT=GND)

IRSC

-2

-10

TTL/CMOS Output Short Circuit

Current (VOUT=VCC)

IRSC

AC ELECTRICAL CHARACTERISTICS

°C to 70°C)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Transition Slew Rate

tSR

612

µs

Transmitter Propagation

Delay TTL to RS-232

tPHLT

tPLHT

1.3

1.5

3.5

µs

Receiver Propagation

Delay RS-232 to TTL

tPHLR

tPLHR

0.5

0.6

µs

Transmitter + to - Propagation

Delay Difference

tPHLT

-tPLHT

300

Receiver + to - Propagation

Delay Difference

tPHLR

-tPLHR

100

NOTES:

1. All voltages are referenced to ground.

2. All transmitter outputs loaded with 3 k

Ω=to ground

3. VCC = V+ = V- = 0V; VOUT =

±2V.

4. VOUT = 0V.

5. IOUT = 3.2 mA.

6. IOUT = -1.0 mA.

7. CL = 50 pF - 2500 pF; RL = 3 k

Ω=- 7 kΩ; V

CC = 5V; TA = 25

°C.

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