M41ST87YSS6F datasheet(44/54 Pages) STMICROELECTRONICS

部件名	M41ST87YSS6F

功能描述	5.0 and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM

PDF	54 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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44 / 54 page

DC and AC parameters

M41ST87W

44/54

DocID9497 Rev 11

(3)

RSTIN1andRSTIN2internallypulleduptoVCCthrough100kΩresistor.WDIinternallypulled-downtoVSSthrough100kΩ

resistor.

(4)

Outputs deselected.

(5)

External SRAM must match RTC supervisor chip VCC specification.

(6)

For

PFO1andPFO2(ifPFOD='0'),SQW/FT(ifSQWOD='0'),andTPCLRpins(CMOS).

(7)Conditioned output (E̅CON) can only sustain CMOS leakage current in the battery backup mode. Higher leakage currents will

reduce battery life.

(8)

TPCLR output can source –300 µA (typ) for VBAT = 2.9 V.

(9)

For

IRQ/OUT,SQW/FT(ifSQWOD='1'),PFO1andPFO2(ifPFOD='1'),RST,SDA,andF32kpins(opendrain).

Table 20: Crystal electrical characteristics

Symbol

Parameter

(1)

Min

Typ

Max

Units

Resonant frequency

32.768

kHz

Series resistance

(2)

kΩ

Load capacitance

12.5

Notes:

(1)

Load capacitors are integrated within the M41ST87. Circuit board layout considerations for the 32.768 kHz crystal of minimum

trace lengths and isolation from RF generating signals should be taken into account.

(2)

TA = –40 to 85 °C (guaranteed by design).

Note: Crystal: user supplied for the 20-lead SSOP package. STMicroelectronics

recommends the KDS DT-38 (3 x 8 mm) for thru-hole, or the KDS DMX-26S for surface-

mount, tuning fork-type quartz crystals.

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