m41t94 STMicroelectronics, m41t94 Datasheet - Page 31

• Manufacturer Part Number: m41t94
• Description: Serial Real-time Clock With 44 Bytes Nvram And Reset
• Manufacturer: STMicroelectronics

Table 13.
1. Valid for ambient operating temperature: T
2. RSTIN1 and RSTIN2 internally pulled-up to V
3. Outputs deselected.
4. For rechargeable back-up, V
5. For SQW pin (CMOS).
6. For IRQ/FT/OUT, RST pins (open drain): if pulled-up to supply other than V
Table 14.
1. Load capacitors are integrated within the M41T94. Circuit board layout considerations for the 32.768 kHz
2. STMicroelectronics recommends the KDS DT-38: 1TA/1TC252E127, Tuning Fork Type (thru-hole) or the
Symb.
I
V
V
I
I
I
LO
V
V
I
V
Symbol
LI
V
CC1
CC2
V
BAT
V
to, or less than 3.0V when V
crystal of minimum trace lengths and isolation from RF generating signals should be taken into account.
These characteristics are externally supplied.
DMX-26S: 1TJS125FH2A212, (SMD) quartz crystal for industrial temperature operations. For contact
information on this crystal type, see
PFD
BAT
OH
OL
SO
(2)
IH
IL
SS
(3)
R
C
f
0
S
L
through 100K
Battery current OSC on
Battery current OSC off
Supply current
Supply current (standby)
Input leakage current
Output leakage current
Input high voltage
Input low voltage
Battery voltage
Output high voltage
Output low voltage
Output low voltage
(open drain)
Pull-up supply voltage
(open drain)
Power fail deselect (THS = V
Power fail deselect (THS = V
Battery back-up switchover
DC characteristics
Crystal electrical characteristics (externally supplied)
Resonant frequency
Series resistance
Load capacitance
Parameter
resistor.
(6)
Parameter
(5)
CC
BAT
(5)
= 0V (during battery back-up mode).
(max) may be considered V
Section 9: References on page
CC
SS
(1)(2)
)
A
)
= –40 to 85°C; V
CC
RST, IRQ/FT/OUT
Test condition
T
0V
through 100K
0V
A
0V, V
I
OH
I
I
SCL, SDI =
= 25°C, V
V
OL
OL
f = 2 MHz
CC
V
= –1.0mA
= 3.0mA
V
= 10mA
BAT
OUT
– 0.3V
IN
= 3V
CC
CC
V
CC
V
.
CC
32.768
CC
= 2.7 to 5.5V (except where noted).
resistor. WDI internally pulled-down to
(1)
12.5
Typ
=
39.
0.7V
–0.3
4.20
2.55
Min
2.5
2.4
CC
CC
Min
, this supply must be equal
4.40
2.60
Typ
400
2.5
50
Max
50
V
0.3V
CC
3.5
Max
4.50
2.70
500
1.4
0.4
0.4
5.5
±1
±1
2
+ 0.3
(4)
CC
Unit
kHz
k
pF
31/41
Unit
mA
mA
nA
nA
µA
µA
V
V
V
V
V
V
V
V