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参数资料
| 型号： | M48T559 |
| 厂商： | 意法半导体 |
| 英文描述： | 64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADDRESS/DATA MULTIPLEXED |
| 中文描述： | 64千位8KB的x8 SRAM的计时与地址/数据复用 |
| 文件页数： | 3/18页 |
| 文件大小： | 147K |
| 代理商： | M48T559 |
3/18
M48T559Y
mation once per second. The information can be
accessed by the user in the same manner as any
other location in the static memory array.
The M48T559Y also has its own Power-fail Detect
circuit. The control circuitry constantly monitors
the single 5V supply for an out of tolerance condi-
tion.
Table 3. Operating Modes
(1)
Mode
Note: 1. X = V
IH
or V
IL
; V
SO
= Battery Back-up Switchover Voltage.
2. See Table 7 for details.
3. AD0-AD7, AS0, AS1 active when E is high and V
CC
> V
PFD
.
V
CC
E
R
W
AD0-AD7
Power
Deselect
4.5V to 5.5V
V
IH
X
X
High Z
Standby
(3)
Write
V
IL
V
IL
V
IL
V
IH
V
IL
V
IH
V
IL
V
IH
V
IH
D
IN
D
OUT
Active
Read
Active
Read
High Z
Active
Deselect
V
SO
to V
PFD
(min)
(2)
≤
V
SO
X
X
X
High Z
CMOS Standby
Deselect
X
X
X
High Z
Battery Back-up Mode
Figure 3. Block Diagram
AI01676B
LITHIUM
CELL
OSCILLATOR AND
CLOCK CHAIN
VPFD
VCC
32,768 Hz
CRYSTAL
VOLTAGE SENSE
AND
SWITCHING
CIRCUITRY
8176 x 8
SRAM ARRAY
W
R
POWER
AS1
AD0-AD7
AS0
RSTIN1
RSTIN2
RST
IRQ/FT
16 x 8 BiPORT
SRAM ARRAY
E
VSS
DATA
TRANSCEIVER
UPPER
ADDRESS
LATCH
LOWER
ADDRESS
LATCH
When V
CC
is out of tolerance, the circuit write pro-
tects the SRAM, providing a high degree of data
security in the midst of unpredictable system oper-
ation brought on by low V
CC
. As V
CC
falls below
approximately 3V, the control circuitry connects
the battery which maintains data and clock opera-
tion until valid power returns.
相关PDF资料 |
PDF描述 |
|---|---|
| M48T559YMH1 | MOD. CONN, M,RJ-11, 6WIRE |
| M48T559YMH1TR | 6-WIRE COUPLER STRAIGHT-PIN |
| M48T559YMH | 64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADDRESS/DATA MULTIPLEXED |
| M48T59-70MH1 | 64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| M48T59V-70MH1 | 64 Kbit 8Kb x8 TIMEKEEPER SRAM |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T559Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADDRESS/DATA MULTIPLEXED |
| M48T559YMH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADDRESS/DATA MULTIPLEXED |
| M48T559YMH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADDRESS/DATA MULTIPLEXED |
| M48T559Y-MH1 | 功能描述:RAM其它 8KX8 TIMEKEEPR RoHS:否 制造商:Freescale Semiconductor 封装:Tray |
| M48T559YMH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADDRESS/DATA MULTIPLEXED |
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