參數(shù)資料
型號(hào)： M48TMH1
廠商： 意法半導(dǎo)體
英文描述： 5V PC REAL TIME CLOCK
中文描述： 5V的電腦實(shí)時(shí)時(shí)鐘
文件頁(yè)數(shù)： 3/23頁(yè)
文件大?。?/td> 163K
代理商： M48TMH1
3/23
M48T86
Table 2. Absolute Maximum Ratings
(1)
Symbol
T
A
Ambient Operating Temperature
T
STG
Storage Temperature (V
CC
Off, Oscillator Off)
Note: 1. Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above those indicated in the operational section
of this specification is not implied. Exposure to the absolute maximum rating conditions for extended periods of time may affect
reliability.
2.
Soldering temperature not to exceed 260°C for 10 seconds (total thermal budget not to exceed 150°C for longer than 30 seconds).
CAUTION:
Negative undershoots below –0.3V are not allowed on any pin while in the Battery Back-up mode.
CAUTION:
Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.
Parameter
Value
Unit
0 to 70
°C
–40 to 85
°C
T
SLD (2)
V
IO
V
CC
P
D
Lead Solder Temperature for 10 seconds
260
°C
Input or Output Voltages
–0.3 to 7.0
V
Supply Voltage
–0.3 to 7.0
V
Power Dissipation
1
W
For the 28 lead SOIC, the battery/crystal package
part number is "M4T28-BR12SH1".
Automatic deselection of the device provides in-
surance that data integrity is not compromised
should V
CC
fall below specified Power-fail Dese-
lect Voltage (V
PFD
) levels. The automatic deselec-
tion of the device remains in effect upon power up
for a period of 200ms (max) after V
CC
rises above
V
PFD
, provided that the Real Time Clock is running
and the count down chain is not reset. This allows
sufficient time for V
CC
to stabilize and gives the
system clock a wake up period so that a valid sys-
tem reset can be established.
The block diagram in Figure 3 shows the pin con-
nections and the major internal functions of the
M48T86.
SIGNAL DESCRIPTION
V
CC
, V
SS
.
DC power is provided to the device on
these pins.The M48T86 utilizes a 5V V
CC
.
SQW (Square Wave Output).
During normal op-
eration (i.e. valid V
CC
), the SQW pin can output a
signal from one of 13 taps.The frequency of the
SQW pin can be changed by programming Regis-
ter A as shown in Table 10. The SQW signal can
be turned on and off using the SQWE bit (Register
B; bit 3). The SQW signal is not available when
V
CC
is less than V
PFD
.
AD0-AD7 (Multiplexed Bi-Directional Address/
Data Bus).
The M48T86 provides a multiplexed
bus in which address and data information share
the same signal path. The bus cycle consists of
two stages; first the address is latched, followed by
the data. Address/Data multiplexing does not slow
the access time of the M48T86, since the bus
change from address to data occurs during the in-
ternal RAM access time. Addresses must be valid
prior to the falling edge of AS, at which time the
M48T86 latches the address present on AD0-
AD7. Valid write data must be present and held
stable during the latter portion of the R/W pulse. In
a read cycle, the M48T86 outputs 8 bits of data
during the latter portion of the DS pulse. The read
cycle is terminated and the bus returns to a high
impedance state upon a high transition on R/W.
AS (Address Strobe Input).
A positive going
pulse on the Address Strobe (AS) input serves to
demultiplex the bus. The falling edge of AS causes
the address present on AD0-AD7 to be latched
within the M48T86.
MOT (Mode Select).
The MOT pin offers the flex-
ibility to choose between two bus types. When
connected to V
CC
, Motorola bus timing is selected.
When connected to V
SS
or left disconnected, Intel
bus timing is selected. The pin has an internal pull-
down resistance of approximately 20K ohms.
相關(guān)PDF資料
PDF描述
M48TMH1TR 5V PC REAL TIME CLOCK
M48TY-85MH1 3.3V-5V TIMEKEEPER CONTROLLER
M48TY-85MH1TR 3.3V-5V TIMEKEEPER CONTROLLER
M48TY-85PM1 3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM
M48Z02 16 Kbit 2Kb x 8 ZEROPOWER SRAM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M48TMH1TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V PC REAL TIME CLOCK
M48TPC1 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V PC REAL TIME CLOCK
M48TPC1TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V PC REAL TIME CLOCK
M4-8TP-RJ45 制造商:Hirschmann Electronics GmbH & Co Kg 功能描述:Media Module, MACH 4000, 8xRJ45 (10/100 Meg) + 8xRJ45 (10 Meg) Copper Ports
M48TV-70MH1 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*