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参数资料
| 型号： | M48T513V-85CS1 |
| 厂商： | 意法半导体 |
| 英文描述： | 3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| 中文描述： | 3.3 - 5V的4兆位的SRAM 512KB的x8计时器 |
| 文件页数： | 10/23页 |
| 文件大小： | 145K |
| 代理商： | M48T513V-85CS1 |
M48T513Y, M48T513V
10/23
Table 10. Write Mode AC Characteristics
(T
A
= 0 to 70
°
C)
Note: 1. C
L
= 5pF.
2. If E goes low simultaneously with W going low, the outputs remain in the high impedance state.
Symbol
Parameter
M48T513Y
M48T513V
Unit
-70
-85
Min
Max
Min
Max
t
AVAV
Write Cycle Time
70
85
ns
t
AVWL
Address Valid to Write Enable Low
0
0
ns
t
AVEL
Address Valid to Chip Enable Low
0
0
ns
t
WLWH
Write Enable Pulse Width
50
60
ns
t
ELEH
Chip Enable Low to Chip Enable High
55
65
ns
t
WHAX
Write Enable High to Address Transition
5
5
ns
t
EHAX
Chip Enable High to Address Transition
10
15
ns
t
DVWH
Input Valid to Write Enable High
30
35
ns
t
DVEH
Input Valid to Chip Enable High
30
35
ns
t
WHDX
Write Enable High to Input Transition
5
5
ns
t
EHDX
Chip Enable High to Input Transition
10
15
ns
t
WLQZ(1, 2)
Write Enable Low to Output Hi-Z
25
30
ns
t
AVWH
Address Valid to Write Enable High
60
70
ns
t
AVEH
Address Valid to Chip Enable High
60
70
ns
t
WHQX(1, 2)
Write Enable High to Output Transition
5
5
ns
If theprocessor does notreset the timer within the
specified period, the M48T513Y/V sets the WDF
(Watchdog Flag) and generates a watchdog inter-
rupt or a microprocessor reset. WDF is reset by
reading theFlags Register (Address7FFF0h). The
most significantbit of the Watchdog Register is the
Watchdog Steering Bit (WDS). When set to a ’0’,
the watchdog will activate the IRQ/FT pin when
timed-out. WhenWDS is set to a ’1’, the watchdog
will output a negative pulse on the RST pin for 40
to 200 ms. The Watchdog register and the FT bit
will reset to a ’0’ at the endof a Watchdog time-out
when theWDS bit is set toa ’1’. The watchdog tim-
er can be reset by two methods: 1) a transition
(high-to-low or low-to-high) can be applied to the
Watchdog Input pin (WDI) or 2) the microproces-
sor can perform a write of the Watchdog Register.
The time-out period then starts over. The WDI pin
should be tied to V
SS
if not used. The watchdog
will be reset on each transition (edge) seen by the
WDI pin. In the order to perform a software reset
of the watchdog timer, the original time-out period
can be written into the Watchdog Register, effec-
tively restarting the count-down cycle.
Should the watchdog timer time-out,and theWDS
bit is programmed to output an interrupt, a value of
00h needs to be written to the Watchdog Register
in order to clear the IRQ/FT pin. This will also dis-
able the watchdog function until it is again pro-
grammed correctly. A read of the Flags Register
will reset the Watchdog Flag (Bit D7; Register
7FFF0h).
The watchdog function is automatically disabled
upon power-down and the Watchdog Register is
cleared. If the watchdog function is set to output to
the IRQ/FT pin and the frequency test function is
activated, the watchdog or alarm function prevails
and the frequency test function is denied.
POWER-ON RESET
The M48T513Y/V continuously monitors V
CC
.
When V
CC
falls to the power fail detect trip point,
the RSTpulls low (open drain) and remains low on
power-up for 40 to 200ms after V
CC
passes V
PFD
.
The RSTpin is anopen drain output and an appro-
priate pull-up resistor to V
CC
should be chosen to
control the rise time.
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| M48T559YSH | Hook-Up Wire; Conductor Size AWG:24; No. Strands x Strand Size:Solid; Jacket Color:Yellow; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T513V-85PM1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513VPM | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513VSH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513Y-70CS1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
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