ICL3232IVZ datasheet(13/28 Pages) RENESAS

13 / 28 page

ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243

FN4805 Rev 22.00

Page 13 of 28

September 1, 2015

Mouse Driveability

The ICL324X have been specifically designed to power a

serial mouse while operating from low voltage supplies.

Figure 9 shows the transmitter output voltages under

increasing load current. The on-chip switching regulator

ensures the transmitters will supply at least 5V during worst

case conditions (15mA for paralleled V+ transmitters, 7.3mA

for single V- transmitter). The Automatic Powerdown feature

does not work with a mouse, so FORCEOFF and

FORCEON should be connected to VCC.

High Data Rates

The ICL32XX maintain the RS-232 5V minimum transmitter

output voltages even at high data rates. Figure 10 details a

transmitter loopback test circuit, and Figure 11 illustrates the

loopback test result at 120kbps. For this test, all transmitters

were simultaneously driving RS-232 loads in parallel with

1000pF, at 120kbps. Figure 12 shows the loopback results

for a single transmitter driving 1000pF and an RS-232 load

at 250kbps. The static transmitters were also loaded with an

RS-232 receiver.

TIME (20

s/DIV)

2V/DIV

5V/DIV

VCC = +3.3V

FORCEOFF

FIGURE 8. TRANSMITTER OUTPUTS WHEN EXITING

POWERDOWN

C1 - C4 = 0.1

F

FIGURE 9. TRANSMITTER OUTPUT VOLTAGE vs LOAD

CURRENT (PER TRANSMITTER, i.e., DOUBLE

CURRENT AXIS FOR TOTAL VOUT+ CURRENT)

LOAD CURRENT PER TRANSMITTER (mA)

024

-6

-4

-2

-5

-3

-1

3579

VOUT+

VOUT -

VCC

VOUT+

VOUT -

VCC = 3.0V

ICL3241/43

FIGURE 10. TRANSMITTER LOOPBACK TEST CIRCUIT

FIGURE 11. LOOPBACK TEST AT 120kbps

FIGURE 12. LOOPBACK TEST AT 250kbps

ICL32XX

VCC

FORCEOFF

1000pF

V+

V-

TIN

ROUT

C1+

C1-

C2+

C2-

RIN

TOUT

VCC

0.1

F

VCC

SHDN OR

T1IN

T1OUT

R1OUT

s/DIV

VCC = +3.3V

5V/DIV

C1 - C4 = 0.1

F

T1IN

T1OUT

R1OUT

s/DIV.

5V/DIV.

VCC = +3.3V

C1 - C4 = 0.1

F

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