3225ECPZ View Datasheet(PDF) - Intersil

Part Name

Description

Manufacturer

3225ECPZ

±15kV ESD Protected, +3V to +5.5V, 1Microamp, 1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown

Intersil 

ICL3225E, ICL3227E, ICL3245E

an RS-232 load at 1Mbps. The static transmitters were also

loaded with an RS-232 receiver.

VCC

0.1µF

+

5V/DIV.

T1IN

+

C1+

VCC

V+

C1

+

C3

C1-

ICL32XXE

+

C2+

C2

V-

+C4

C2-

TIN

TOUT

ROUT

RIN

CL

FORCEON

5k

VCC

FORCEOFF

FIGURE 12. TRANSMITTER LOOPBACK TEST CIRCUIT

5V/DIV.

T1IN

T1OUT

R1OUT

VCC = +3.3V

C1 - C4 = 0.1µF

2µs/DIV.

FIGURE 13. LOOPBACK TEST AT 250kbps (CL = 1000pF)

T1OUT

R1OUT

VCC = +3.3V

C1 - C4 = 0.1µF

0.5µs/DIV.

FIGURE 14. LOOPBACK TEST AT 1Mbps (CL = 250pF)

Interconnection with 3V and 5V Logic

The ICL32XXE directly interfaces with 5V CMOS and TTL

logic families. Nevertheless, with the ICL32XX at 3.3V, and

the logic supply at 5V, AC, HC, and CD4000 outputs can

drive ICL32XX inputs, but ICL32XX outputs do not reach the

minimum VIH for these logic families. See Table 4 for more

information.

TABLE 4. LOGIC FAMILY COMPATIBILITY WITH VARIOUS

SUPPLY VOLTAGES

SYSTEM

POWER-SUPPLY

VOLTAGE

(V)

VCC

SUPPLY

VOLTAGE

(V)

COMPATIBILITY

3.3

3.3 Compatible with all CMOS

families.

5

5

Compatible with all TTL and

CMOS logic families.

5

3.3 Compatible with ACT and HCT

CMOS, and with TTL. ICL32XX

outputs are incompatible with AC,

HC, and CD4000 CMOS inputs.

±15kV ESD Protection

All pins on ICL32XX devices include ESD protection

structures, but the ICL32XXE family incorporates advanced

structures which allow the RS-232 pins (transmitter outputs

and receiver inputs) to survive ESD events up to ±15kV. The

RS-232 pins are particularly vulnerable to ESD damage

because they typically connect to an exposed port on the

exterior of the finished product. Simply touching the port

pins, or connecting a cable, can cause an ESD event that

might destroy unprotected ICs. These new ESD structures

protect the device whether or not it is powered up, protect

without allowing any latchup mechanism to activate, and

don’t interfere with RS-232 signals as large as ±25V.

13

FN4900.9

February 27, 2006

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