DatasheetQ Logo
Electronic component search and free download site.
Transistors,MosFET ,Diode,Integrated circuits

M48T201Y-85MH View Datasheet(PDF) - STMicroelectronics

Part Name
Description
Manufacturer
M48T201Y-85MH
ST-Microelectronics
STMicroelectronics ST-Microelectronics
M48T201Y-85MH Datasheet PDF : 35 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Operation
M48T201Y, M48T201V
Note:
Table 2. Operating modes
Mode
VCC
E
G
W
Deselect
WRITE
READ
4.5V to 5.5V
or
3.0V to 3.6V
VIH
X
X
VIL
X
VIL
VIL
VIL
VIH
READ
VIL
VIH
VIH
Deselect VSO to VPFD (min)(1)
X
X
X
Deselect
≤ VSO(1)
X
X
X
1. See Table 14 on page 29 for details.
X = VIH or VIL; VSO = Battery Back-up Switchover Voltage
DQ7-
DQ0
High-Z
DIN
DOUT
High-Z
High-Z
High-Z
Power
Standby
Active
Active
Active
CMOS Standby
Battery Back-Up
2.2
Read mode
The M48T201Y/V executes a READ Cycle whenever W (WRITE Enable) is high and E (Chip
Enable) is low. The unique address specified by the address inputs (A0-A18) defines which
one of the on-chip TIMEKEEPER® registers or external SRAM locations is to be accessed.
When the address presented to the M48T201Y/V is in the range of 7FFFFh-7FFF0h, one of
the on-board TIMEKEEPER registers is accessed and valid data will be available to the
eight data output drivers within tAVQV after the address input signal is stable, providing that
the E and G access times are also satisfied. If they are not, then data access must be
measured from the latter occurring signal (E or G) and the limiting parameter is either tELQV
for E or tGLQV for G rather than the address access time. When one of the on-chip
TIMEKEEPER registers is selected for READ, the GCON signal will remain inactive
throughout the READ Cycle.
When the address value presented to the M48T201Y/V is outside the range of
TIMEKEEPER registers, an external SRAM location will be selected. In this case the G
signal will be passed to the GCON pin, with the specified delay times of tAOEL or tOERL.
Figure 4. GCON timing when switching between RTC and external SRAM
ADDRESS 7FFF0h - 7FFFFh
RTC
G
00000h - 7FFEFh
External SRAM
GCON
E
tAOEL
7FFF0h - 7FFFFh
RTC
00000h - 7FFEFh
External SRAM
tAOEH tOERL
tRO
AI02333
10/35
 

Share Link: 

datasheetq.com  [ Privacy Policy ]Request Datasheet ] [ Contact Us ]