M48T58Y-70PC1 STMicroelectronics, M48T58Y-70PC1 Datasheet - Page 20

• Manufacturer Part Number: M48T58Y-70PC1
• Description: IC TIMEKPR NVRAM 64KBIT 5V 28DIP
• Manufacturer: STMicroelectronics
• Series: Timekeeper®r
• Type: Clock/Calendar/NVSRAMr

Specifications of M48T58Y-70PC1

• Memory Size: 64K (8K x 8)
• Time Format: HH:MM:SS (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP Module (600 mil), 28-EDIP
• Function: Clock/Calendar/NV Timekeeping RAM/Battery Backup
• Rtc Memory Size: 8192 Byte
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: Through Hole
• Rtc Bus Interface: Parallel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-2859-5; M48T58Y-70PC1

Clock operations
6.7
20/33
V
I
fluctuations, resulting in spikes on the V
capacitors are used to store energy which stabilizes the V
bypass capacitors will be released as low going spikes are generated or energy will be
absorbed when overshoots occur. A bypass capacitor value of 0.1 µF (as shown in
Figure
In addition to transients that are caused by normal SRAM operation, power cycling can
generate negative voltage spikes on V
one volt. These negative spikes can cause data corruption in the SRAM while in battery
backup mode. To protect from these voltage spikes, it is recommended to connect a
Schottky diode from V
1N5817 is recommended for through hole and MBRS120T3 is recommended for surface
mount.
Figure 10. Supply voltage protection
CC
CC
transients, including those produced by output switching, can produce voltage
noise and negative going transients
10) is recommended in order to provide the needed filtering.
CC
to V
V CC
SS
Doc ID 2412 Rev 7
(cathode connected to V
0.1µF
CC
CC
that drive it to values below V
bus. These transients can be reduced if
V CC
V SS
DEVICE
CC
CC
, anode to V
bus. The energy stored in the
SS
SS
M48T58, M48T58Y
by as much as
). Schottky diode
AI02169