參數(shù)資料
型號(hào)： DS1644P
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： XO, clock
英文描述： Nonvolatile Timekeeping RAM(非易失性計(jì)時(shí)RAM)
中文描述： 0 TIMER(S), REAL TIME CLOCK, DMA34
封裝： POWERCAP MODULE-34
文件頁(yè)數(shù)： 1/12頁(yè)
文件大小： 131K
代理商： DS1644P
DS1644/DS1644P
Nonvolatile Timekeeping RAM
DS1644/DS1644P
031698 1/12
FEATURES
Integrated NV SRAM, real time clock, crystal, power–
fail control circuit and lithium energy source
Clock registers are accessed identical to the static
RAM. These registers are resident in the eight top
RAM locations.
Totally nonvolatile with over 10 years of operation in
the absence of power
Access time of 120 ns and 150 ns
BCD coded year, month, date, day, hours, minutes,
and seconds with leap year compensation valid up to
2100
Power–fail write protection allows for
±
10% V
CC
pow-
er supply tolerance
DS1644 only (DIP Module)
– Upward compatible with the DS1643 Timekeep-
ing RAM to achieve higher RAM density
– Standard JEDEC Byte–wide 32K x 8 static RAM
pinout
DS1644P only (PowerCap Module Board)
– Surface mountable package for direct connec-
tion to PowerCap containing battery and crystal
– Replaceable battery (PowerCap)
– Power–fail Output
– Pin for pin compatible with other densities of
DS164XP Timekeeping RAM
ORDERING INFORMATION
DS1644–XXX
–120
–150
120 ns access
150 ns access
*DS1644P–XXX
–120
–150
120 ns access
150 ns access
28–pin DIP module
34–pin PowerCap Module Board
*DS9034PCX
(Power Cap) Required;
must be ordered separately
PIN ASSIGNMENT
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
WE
PFO
V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
VCC
A13
A8
A9
A11
A10
DQ7
DQ6
DQ5
DQ4
DQ3
WE
OE
CE
28–PIN ENCAPSULATED PACKAGE
(720 MIL EXTENDED)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
NC
NC
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
NC
NC
NC
34(USES DS9034PCX POWERCAP)
X1
GND
V
BAT
X2
PIN DESCRIPTION
A0–A14
CE
OE
WE
V
CC
GND
DQ0–DQ7
NC
PFO
X1, X2
V
BAT
– Address Input
– Chip Enable
– Output Enable
– Write Enable
– +5 Volts
– Ground
– Data Input/Output
– No Connection
– Power–fail Output (DS1644P only)
– Crystal Connection
– Battery Connection
相關(guān)PDF資料
PDF描述
DS1646 Nonvolatile Timekeeping RAM(非易失性計(jì)時(shí)RAM)
DS1646P Nonvolatile Timekeeping RAM(非易失性計(jì)時(shí)RAM)
DS1670 Portable System Controller(便攜式系統(tǒng)控制器)
DS1673 Portable System Controller(便攜式系統(tǒng)控制器)
DS1678 Real-Time Event Recorder
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1644P+120 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM
DS1644P-120 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1644P120+ 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM
DS1644P-120+ 功能描述:實(shí)時(shí)時(shí)鐘 NV Timekeeping RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1644P-150 制造商:Maxim Integrated Products 功能描述:
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