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參數(shù)資料
| 型號(hào)： | STK1743-D25 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | NV TIME 8K X 8 AUTOSTORE NVSRAM WITH REAL - TIME CLOCK |
| 中文描述： | 內(nèi)華達(dá)州時(shí)間8K的乘八與實(shí)時(shí)自動(dòng)存儲(chǔ)非易失性SRAM -時(shí)間時(shí)鐘 |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大小： | 253K |
| 代理商： | STK1743-D25 |
STK1743
March 1999
7-7
The STK1743 is an 8K x 8 nonvolatile static
RAM
with a full-function real-time clock (
RTC
). The data
integrity is secured in
EEPROM
, not subject to bat-
tery or capacitor discharge. The real-time clock reg-
isters reside in the eight uppermost
RAM
locations,
and contain century, year, month, date, day, hour,
minute and second data in 24-hour
BCD
format. Cor-
rections for the day of the month and leap years are
made automatically. This nonvolatile time-keeping
RAM
is functionally similar to any
JEDEC
standard
8K x 8
SRAM
.
The
RTC
registers are double-buffered to avoid
access of incorrect data that could otherwise occur
during clock update cycles. The double-buffered
system prevents time loss by maintaining internal
clock operation while time register data is accessed.
The STK1743 contains integral power-fail circuitry
that deselects the device when V
CC
drops below
V
SWITCH
.
The STK1743 is a pin-compatible replacement for
the ST Microelectronics M48T08 and the Dallas
Semiconductor DS1743, but without the limitations
of an embedded lithium battery. The Simtek device
uses a double-layer high-value capacitor to maintain
RTC
operation on power down for at least 30 days.
The part can be soldered directly onto printed circuit
boards and handled without concern for damaging
or discharging internal batteries. Unlike some other
RTC
s, the STK1743 is Year 2000-compliant.
NOISE CONSIDERATIONS
Note that the STK1743 is a high-speed memory and
so must have a high-frequency bypass capacitor of
approximately 0.1
μ
F connected between V
CC
and
V
SS
, using leads and traces that are as short as pos-
sible. As with all high-speed
CMOS
ICs, normal care-
ful routing of power, ground and signals will help
prevent noise problems.
SRAM AND RTC READ
The STK1743 performs a
READ
cycle whenever E
and G are low and W is high. The address specified
on pins A
0-12
determines which of the 8,192 data
bytes will be accessed. When the
READ
is initiated
by an address transition, the outputs will be valid
after a delay of t
AVQV
(
READ
cycle #1). If the
READ
is
initiated by E or G, the outputs will be valid at t
ELQV
or
at t
GLQV
, whichever is later (
READ
cycle #2). The data
outputs will repeatedly respond to address changes
within the t
AVQV
access time without the need for tran-
sitions on any control input pins, and will remain valid
until another address change or until E or G is
brought high or W is brought low.
Note that the eight most significant bytes of the
address space are reserved for accessing the
RTC
registers, as shown in the Register Map below.
While the double-buffered
RTC
register structure
reduces the chance of reading incorrect data from the
clock, the user should halt internal updates to the
DEVICE OPERATION
RTC REGISTER MAP
ADDRESS
(HEXADECIMAL)
BCD DATA
FUNCTION/RANGE
D7
D6
D5
D4
D3
D2
D1
D0
1FF8
W
R
10 Centuries
Centuries
Centuries: 00-39, Control
1FF9
X
10 Seconds
Seconds
Seconds: 00 - 59
1FFA
X
10 Minutes
Minutes
Minutes:
00 - 59
1FFB
X
X
10 Hours
Hours
Hours:
00 - 23
1FFC
1
FT
X
X
X
Days
Days:
01 - 07
1FFD
X
X
10 Dates
Dates
Dates:
01 - 31
1FFE
X
X
X
10 Mos.
Months
Months:
01 - 12
1FFF
10 Years
Years
Years:
00 - 99
Key:
R = Read Bit
W = Write Bit
1
= Battery Flag High (no battery to fail)
FT = Frequency Test Bit
X
= Don’t Care
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| STK1743-D45I | NV TIME 8K X 8 AUTOSTORE NVSRAM WITH REAL - TIME CLOCK |
| STK1743-D25I | NV TIME 8K X 8 AUTOSTORE NVSRAM WITH REAL - TIME CLOCK |
| STK1743-D35 | NV TIME 8K X 8 AUTOSTORE NVSRAM WITH REAL - TIME CLOCK |
| STK1743-D35I | NV TIME 8K X 8 AUTOSTORE NVSRAM WITH REAL - TIME CLOCK |
| STK1743-D45 | NV TIME 8K X 8 AUTOSTORE NVSRAM WITH REAL - TIME CLOCK |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| STK17T88-RF25 | 功能描述:NVRAM 32Kbx8+RTC 2.7-3.6V RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)總線寬度:8 bit 存儲(chǔ)容量:1024 Kbit 組織:128 K x 8 接口類型:Parallel 訪問(wèn)時(shí)間:70 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 工作電流:85 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 封裝 / 箱體:EDIP 封裝:Tube |
| STK17T88-RF25I | 功能描述:NVRAM 32Kbx8+RTC 2.7-3.6V RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)總線寬度:8 bit 存儲(chǔ)容量:1024 Kbit 組織:128 K x 8 接口類型:Parallel 訪問(wèn)時(shí)間:70 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 工作電流:85 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 封裝 / 箱體:EDIP 封裝:Tube |
| STK17T88-RF25ITR | 功能描述:NVRAM 32Kbx8+RTC 2.7-3.6V RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)總線寬度:8 bit 存儲(chǔ)容量:1024 Kbit 組織:128 K x 8 接口類型:Parallel 訪問(wèn)時(shí)間:70 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 工作電流:85 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 封裝 / 箱體:EDIP 封裝:Tube |
| STK17T88-RF25TR | 功能描述:NVRAM 32Kbx8+RTC 2.7-3.6V RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)總線寬度:8 bit 存儲(chǔ)容量:1024 Kbit 組織:128 K x 8 接口類型:Parallel 訪問(wèn)時(shí)間:70 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 工作電流:85 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 封裝 / 箱體:EDIP 封裝:Tube |
| STK17T88-RF45 | 功能描述:NVRAM 32Kbx8+RTC 2.7-3.6V RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)總線寬度:8 bit 存儲(chǔ)容量:1024 Kbit 組織:128 K x 8 接口類型:Parallel 訪問(wèn)時(shí)間:70 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 工作電流:85 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 封裝 / 箱體:EDIP 封裝:Tube |
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