M41ST87W_11 datasheet(9/54 Pages) STMICROELECTRONICS

Part #	M41ST87W

Description	5.0 V 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%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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9 / 54 page

M41ST87Y, M41ST87W

Description

Doc ID 9497 Rev 10

9/54

Table 1.

Signal names

XI(1)

Available in SSOP package only.

Oscillator input

XO(1)

Oscillator output

ECON

(2)

Available in SOX28 package only.

Conditioned chip enable output

EX(2)

External chip enable

IRQ/OUT(3)

Open drain output.

Interrupt/out output (open drain)

PFI1

Power fail input 1

PFI2

Power fail input 2

PFO1

(4)

Programmable output (open drain or full-CMOS).

Power fail output 1

PFO2

(4)

Power fail output 2

RST(3)

Reset output (open drain)

RSTIN1

Reset 1 input

RSTIN2(2)

Reset 2 input

SCL

Serial clock input

SDA

Serial data input/output

SQW/FT(4)

Square wave output/frequency test

WDI(2)

Watchdog input

VCC

Supply voltage

VOUT

Voltage output

VSS

Ground

F32k

(3)

32 kHz square wave output (open drain)

TP1IN

Tamper pin 1 input

TP2IN

Tamper pin 2 input

TPCLR

(2)

Tamper pin RAM clear

VBAT

Positive battery pin input

NF(5)

Should be connected to VSS.

No function

NC(5)

No connect

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