M48T58Y-70MH1 STMicroelectronics, M48T58Y-70MH1 Datasheet - Page 11

• Manufacturer Part Number: M48T58Y-70MH1
• Description: Real Time Clock 64K (8Kx8) 70ns
• Manufacturer: STMicroelectronics

Specifications of M48T58Y-70MH1

• Function: Clock, Calendar, NV Timekeeping RAM, Battery Backup
• Rtc Memory Size: 8192 B
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Parallel
• Package / Case: SOIC-28
• Time Format: HH:MM:SS
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

M48T58, M48T58Y
4
Figure 6.
A0-A12
E1
E2
W
DQ0-DQ7
WRITE mode
The M48T58/Y is in the WRITE mode whenever W and E1 are low and E2 is high. The start
of a WRITE is referenced from the latter occurring falling edge of W or E1, or the rising edge
of E2. A WRITE is terminated by the earlier rising edge of W or E1, or the falling edge of E2.
The addresses must be held valid throughout the cycle. E1 or W must return high or E2 low
for a minimum of t
initiation of another READ or WRITE cycle. Data-in must be valid t
WRITE and remain valid for t
avoid bus contention; although, if the output bus has been activated by a low on E1 and G
and a high on E2, a low on W will disable the outputs t
WRITE enable controlled, WRITE AC waveform
E1HAX
tAVE1L
tAVE2H
tAVWL
or t
tWLQZ
E2LAX
WHDX
Doc ID 2412 Rev 7
tAVWH
from chip enable or t
tWLWH
afterward. G should be kept high during WRITE cycles to
VALID
tAVAV
tDVWH
DATA INPUT
tWHDX
WHAX
WLQZ
from WRITE enable prior to the
after W falls.
tWHQX
DVWH
tWHAX
prior to the end of
WRITE mode
AI00963
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