m41st87w STMicroelectronics, m41st87w Datasheet - Page 6

• Manufacturer Part Number: m41st87w
• Description: 5.0, 3.3, Or 3.0v, 1280 Bit 160 X8 Secure Serial Rtc And Nvram Supervisor With Tamper Detection
• Manufacturer: STMicroelectronics

M41ST87Y, M41ST87W
Figure 2. Logic Diagram
Note: 1. Open drain output
Figure 3. 28-pin, 300mil SOIC (MX)
Connections
Note: No Function (NF) and No Connect (NC) pins should be tied
6/42
RSTIN1
RSTIN2
SQW/FT
TP1 IN
TP2 IN
RSTIN1
RSTIN2
to V
2. Programmable output (Open drain or Full-CMOS)
SDA
PFI 1
PFI 2
SCL
WDI
PFO 2
PFO 1
EX
PFI 2
SS
V SS
WDI
NC
NC
NF
NF
NF
NF
. Pins 1, 2, 3, and 4 are internally shorted together.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V CC
M41ST87W
M41ST87Y
V SS
M41ST87W
M41ST87Y
V BAT
28
27
26
25
24
23
22
21
20
19
18
17
16
15
E CON
RST (1)
IRQ/OUT (1)
SQW/FT (2)
PFO 1 (2)
PFO 2 (2)
V OUT
F 32k
TP CLR
V CC
EX
IRQ/OUT
V OUT
TP2 IN
PFI 1
SCL
F 32k
TP1 IN
RST
TP CLR
SDA
E CON
V BAT
AI07025b
AI07023
(1)
Table 1. Signal Names
Note: 1. Open drain output
E
EX
IRQ/OUT
PFI
PFI
PFO
PFO
RST
RSTIN1
RSTIN2
SCL
SDA
SQW/FT
WDI
V
V
V
F
TP1
TP2
TP
V
NF
NC
32k
CON
CC
OUT
SS
BAT
CLR
(3)
2. Programmable output (Open drain or Full-CMOS)
3. Should be connected to V
(3)
1
2
IN
IN
(1)
(1)
1
2
(2)
(2)
(2)
(1)
Conditioned Chip Enable Output
External Chip Enable
Interrupt/Out Output
(Open drain)
Power Fail Input 1
Power Fail Input 2
Power Fail Output 1
Power Fail Output 2
Reset Output (Open Drain)
Reset 1 Input
Reset 2 Input
Serial Clock Input
Serial Data Input/Output
Square Wave Output/Frequency
Test
Watchdog Input
Supply Voltage
Voltage Output
Ground
32kHz Square Wave Output
(Open drain)
Tamper Pin 1 Input
Tamper Pin 2 Input
Tamper Pin RAM Clear
Positive Battery Pin Input
No Function
No Connect
SS
.