SN65C23243, SN75C23243

3V TO 5.5V DUAL RS232 PORT

SLLS513A − AUGUST 2001 − REVISED MARCH 2004

11

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

TEST CIRCUIT

VOLTAGE WAVEFORMS

50

Ω

3 V

2.7 V

−2.7 V

INV

Output

Receiver

Input

Generator

(see Note B)

FORCEOFF

tvalid

ROUT

FORCEON

Auto-

powerdown

INV

DOUT

0 V

0 V

−3 V

DIN

CL = 30 pF

(see Note A)

VCC

0 V

2.7 V

−2.7 V

0.3 V

−0.3 V

0 V

Valid RS-232 Level, INV High

Indeterminate

Indeterminate

If Signal Remains Within This Region

for More Than 30

µs, INV Is Low†

Valid RS-232 Level, INV High

† Auto-powerdown disables drivers and reduces

supply current to 1

µA.

≈V+

0 V

≈V−

V+

VCC

ten

V−

NOTES: A. CL includes probe and jig capacitance.

B. The pulse generator has the following characteristics: PRR = 5 kbit/s, ZO = 50 Ω, 50% duty cycle, tr ≤ 10 ns, tf ≤ 10 ns.

50% VCC

50% VCC

2.7 V

−2.7 V

0.3 V

0.3 V

tinvalid

Supply

Voltages

Figure 6. INV Propagation Delay Times and Supply Enabling Time