M48T201V-85MH1TR STMicroelectronics, M48T201V-85MH1TR Datasheet - Page 22

• Manufacturer Part Number: M48T201V-85MH1TR
• Manufacturer: STMicroelectronics

Specifications of M48T201V-85MH1TR

• Bus Type: Parallel
• User Ram: 512KB
• Operating Supply Voltage (typ): 3.3V
• Package Type: SOH
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 44
• Mounting: Surface Mount
• Date Format: DW:DM:M:Y
• Time Format: HH:MM:SS
• Lead Free Status / RoHS Status: Not Compliant

Clock operation
3.8
3.9
3.10
22/37
Power-on reset
The M48T201Y/V continuously monitors V
point, the RST pulls low (open drain) and remains low on power-up for t
passes V
to V
Reset inputs (RSTIN1 & RSTIN2)
The M48T201Y/V provides two independent inputs which can generate an output reset. The
duration and function of these resets is identical to a reset generated by a power cycle.
Figure 9
than t
pulled up to V
Figure 9.
Table 8.
1. Valid for ambient operating temperature: T
2. C
Calibrating the clock
The M48T201Y/V is driven by a quartz controlled oscillator with a nominal frequency of
32,768 Hz. The devices are factory calibrated at 25°C and tested for accuracy. Clock
accuracy will not exceed ±35 ppm (parts per million) oscillator frequency error at 25°C,
which equates to about ±1.53 minutes per month. When the calibration circuit is properly
employed, accuracy improves to better than +1/–2 ppm at 25°C.
t
t
Symbol
R1HRZ
R2HRZ
noted).
CC
L
t
t
R1
= 5 pF (see
R1
R2
should be chosen to control rise time.
RSTIN1
RSTIN2
RST
and t
(2)
(2)
and
PFD
RSTIN1 and RSTIN2 timing waveforms
Reset AC characteristics
Table 8
(max). The RST pin is an open drain output and an appropriate pull-up resistor
R2
CC
RSTIN1 low to RST low
RSTIN2 low to RST low
RSTIN1 high to RST Hi-Z
RSTIN2 high to RST Hi-Z
Figure 13 on page
will not generate a reset condition. RSTIN1 and RSTIN2 are each internally
through a 100 K
illustrate the AC reset characteristics of this function. Pulses shorter
tR1
28).
Parameter
resistor.
A
= 0 to 70°C; V
(1)
CC
tR1HRZ
. When V
Hi-Z
tR2
CC
= 4.5 to 5.5 V or 3.0 to 3.6 V (except where
CC
falls to the power fail detect trip
Min
50
20
40
40
M48T201Y, M48T201V
REC
tR2HRZ
Hi-Z
Max
200
100
200
200
after V
AI01679
CC
Unit
ms
ms
ms
ns