STR750F datasheet(44/73 Pages) STMICROELECTRONICS

部件名	STR750F

功能描述	ARM7TDMI-S, 32-bit MCU with Flash, SMI, 3 std 16-bit timers PWM timer, fast 10-bit ADC, I2C, UART, SSP, USB and CAN

PDF	73 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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44 / 73 page

Electrical parameters

STR750F

44/71

XRTC1 external Clock source

Subject to general operating conditions for VDD_IO, and TA.

Figure 20.

Typical application with an external Clock source

Table 20.

XRTC1 external Clock source

Symbol

Parameter

Conditions(1)

Data based on typical application software.

Min

Typ

Max

Unit

fXRTC1

External clock source

frequency

see Figure 20

32.768

500

kHz

VXRTC1H

XRTC1 input pin high

level voltage

0.7xVDD_IO

VDD_IO

VXRTC1L

XRTC1 input pin low level

voltage

VSS

0.3xVDD_IO

tw(XRTC1H)

tw(XRTC1L)

XRTC1 high or low time(2)

Data based on design simulation and/or technology characteristics, not tested in production.

990

tr(XRTC1)

tf(XRTC1)

XRTC1 rise or fall time(2)

XRTCx Input leakage

current

VSS≤VIN≤VDD_I

±1

µA

XT1

XT2

fOSC4M

EXTERNAL

STR750

CLOCK SOURCE

VXT1L

VXT1H

tr(XT1)

tf(XT1)

tw(XT1H)

tw(XT1L)

90%

10%

TXT1

hi-Z

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