C541U 데이터 시트보기 (PDF) - Siemens AG

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C541U

8-Bit CMOS Microcontroller

Siemens AG 

C540U

C541U

VCC -0.5 V

0.2 VCC+0.9

Test Points

0.45 V

0.2 VCC -0.1

MCT00039

AC Inputs during testing are driven at VCC - 0.5 V for a logic ’1’ and 0.45 V for a logic ’0’.

Timing measurements are made at VIHmin for a logic ’1’ and VILmax for a logic ’0’.

Figure 35

AC Testing: Input, Output Waveforms

VLoad

VLoad +0.1 V

Timing Reference

Points

VOH -0.1 V

VLoad -0.1 V

VOL +0.1 V

MCT00038

For timing purposes a port pin is no longer floating when a 100 mV change from load voltage

occurs and begins to float when a 100 mV change from the loaded VOH/VOL level occurs.

IOL/IOH ≥ ± 20 mA

Figure 36

AC Testing : Float Waveforms

2.8 V

30 k Ω

Test Point

S1

1.5 k Ω *)

D.U.T

15 k Ω

CL

C L = 50 pF, full speed

C L = 50 pF, low speed (min. timing)

C L = 350 pF, low speed (max. timing)

*) 1.5 kΩ on D- (low speed) or D+ (full speed) only

Test S1

D- / LS

D+ / LS

D- / FS

D+ / FS

Close

Open

Open

Close

MCS03425

Figure 37

Load for D+/D-

Semiconductor Group

62

1997-10-01

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