MAX3238

3V TO 5.5V MULTICHANNEL RS232 LINE DRIVER/RECEIVER

WITH ±15kV ESD (HBM) PROTECTION

SLLS349J − JUNE 1999 − REVISED MARCH 2004

7

POST OFFICE BOX 655303

AUTO-POWERDOWN PLUS SECTION

electrical characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Figure 5)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VT+(valid)

Receiver input threshold

for INVALID high-level output voltage

FORCEON = GND,

FORCEOFF = VCC

2.7

V

VT−(valid)

Receiver input threshold

for INVALID high-level output voltage

FORCEON = GND,

FORCEOFF = VCC

−2.7

V

VT(invalid)

Receiver input threshold

for INVALID low-level output voltage

FORCEON = GND,

FORCEOFF = VCC

−0.3

0.3

V

VOH

INVALID high-level output voltage

IOH = −1 mA, FORCEON = GND,

FORCEOFF = VCC

VCC−0.6

V

VOL

INVALID low-level output voltage

IOL = 1.6 mA, FORCEON = GND,

FORCEOFF = VCC

0.4

V

† All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25°C.

switching characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Figure 5)

PARAMETER

MIN

TYP†

MAX

UNIT

tvalid

Propagation delay time, low- to high-level output

0.1

µs

tinvalid

Propagation delay time, high- to low-level output

50

µs

ten

Supply enable time

25

µs

tdis

Receiver or driver edge to auto-powerdown plus

15

30

60

s

† All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25°C.

PARAMETER MEASUREMENT INFORMATION

50

Ω

TEST CIRCUIT

VOLTAGE WAVEFORMS

−3 V

−3 V

3 V

3 V

0 V

3 V

Output

Input

VOL

VOH

tTLH

Generator

(see Note B)

RL

3 V

FORCEOFF

RS-232

Output

tTHL

CL

(see Note A)

SR(tr)

+

6V

t

NOTES: A. CL includes probe and jig capacitance.

B. The pulse generator has the following characteristics: PRR = 250 kbit/s, ZO = 50 Ω, 50% duty cycle, tr ≤ 10 ns, tf ≤ 10 ns.

Figure 1. Driver Slew Rate