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参数资料
| 型号： | DS12CR887 |
| 英文描述： | RTC with Constant-Voltage Trickle Charger |
| 中文描述： | 带有恒压涓流充电器的RTC |
| 文件页数： | 10/22页 |
| 文件大小： | 1093K |
| 代理商： | DS12CR887 |
D
RTC with Constant-Voltage Trickle Charger
10
____________________________________________________________________
Pin Description (continued)
PIN
EDIP
SO
BGA
NAME
FUNCTION
12
12
D5–D8,
E1–E8,
F5–F8
GND
Ground
13
13
C1
CS
Chip-Select Input. The active-low chip-select signal must be asserted low for a bus cycle
in the DS12R885 to be accessed.
CS
must be kept in the active state during DS and AS
for Motorola timing and during DS and R/
W
for Intel timing. Bus cycles that take place
without asserting
CS
latch addresses, but no access occurs. When V
CC
is below V
PF
volts,
the DS12R885 inhibits access by internally disabling the
CS
input. This action protects the
RTC data and the RAM data during power outages.
14
14
C3
AS
Address Strobe Input. A positive-going address-strobe pulse serves to demultiplex the
bus. The falling edge of AS causes the address to be latched within the DS12R885. The
next rising edge that occurs on the AS bus clears the address regardless of whether
CS
is
asserted. An address strobe must immediately precede each write or read access. If a
write or read is performed with
CS
deasserted, another address strobe must be performed
prior to a read or write access with
CS
asserted.
15
15
C2
R/
W
Read/Write Input. The R/
W
pin has two modes of operation. When the MOT pin is
connected to V
CC
for Motorola timing, R/
W
is at a level that indicates whether the current
cycle is a read or write. A read cycle is indicated with a high level on R/
W
while DS is high.
A write cycle is indicated when R/
W
is low during DS. When the MOT pin is connected to
GND for Intel timing, the R/
W
signal is an active-low signal. In this mode, the R/
W
pin
operates in a similar fashion as the write-enable signal (
WE
) on generic RAMs. Data are
latched on the rising edge of the signal.
16, 22
2, 3, 16,
20–22
A3
N.C.
No Connection. This pin should remain unconnected. On the EDIP, these pins are missing
by design.
17
17
A1
DS
D ata S r ob e or Read Inp ut. The D S p n has tw o m od es of op er ati on d ep end ng on the l evel of
the M OT p n. When the M O T p n i s connected to V
C C
, M otor ol a b us ti m ng i s sel ected In thi s
m od e, D S i s a p osi i ve p ul se d ur ng the l atter p or i on of the b us cycl e and i s cal ed d ata
str ob e. D ur ng r ead cycl es, D S si g ni i es the ti m e that the D S 12R885 i s to d ve the
b d ecti onal b us. In w e cycl es, the tr ai ng ed g e of D S causes the D S 12R885 to l atch the
w ten d ata. W hen the M O T p n i s connected to G N D Intel b us ti m ng i s sel ected D S
i d enti i es the ti m e p er od w hen the D S 12R885 d ves the b us w h r ead d ata. In thi s m od e, the
D S p n op er ates i n a si m ar fashi on as the outp ut- enab e (
O E
) si g nal on a g ener c RAM
相关PDF资料 |
PDF描述 |
|---|---|
| DS12CR887-33 | RTC with Constant-Voltage Trickle Charger |
| DS12CR887-5 | RTC with Constant-Voltage Trickle Charger |
| DS12CR885 | RTC with Constant-Voltage Trickle Charger |
| DS12CR887 | RTC with Constant-Voltage Trickle Charger |
| DS12CR887-33 | RTC with Constant-Voltage Trickle Charger |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS12CR887-33 | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12CR887-33+ | 功能描述:实时时钟 RTC w/Constant V Trickle Charger RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12CR887-5 | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12CR887-5+ | 功能描述:实时时钟 RTC w/Constant V Trickle Charger RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12R885-33 | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 114BYTE - Bulk |
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