参数资料
型号: DS1558Y
厂商: Maxim Integrated Products
文件页数: 11/18页
文件大小: 0K
描述: IC RTC W/NV RAM 5V 48-TQFP
标准包装: 250
类型: 时钟/日历
特点: 警报器,闰年,监视计时器,Y2K
时间格式: HH:MM:SS(24 小时)
数据格式: YY-MM-DD-dd
接口: 并联
电源电压: 4.5 V ~ 5.5 V
电压 - 电源,电池: 2.5 V ~ 3.7 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 48-LQFP
供应商设备封装: 48-LQFP(7x7)
包装: 托盘
DS1558
2 of 18
PIN DESCRIPTION
PIN
NAME
FUNCTION
1, 13, 39
N.C.
No Connection
41, 43
2
A18
3
A16
4
A14
5
A12
6
A7
7
A6
8
A5
9
A4
10
A3
11
A2
12
A1
14
A0
27
A10
29
A11
30
A9
31
A8
32
A13
36
A15
44
A17
r Ad ess Decode. T e
inputs to determine
read o write cycle should
cted to the attached SRAM or to the
Address Inputs fo
whether or not a
RTC registers.
dr
h DS1558 uses the address
r
be dire
15
DQ0
16
DQ1
17
DQ2
19
DQ3
20
DQ4
21
DQ5
22
DQ6
23
DQ7
Data Input/Outputs. Data input/output pins for the RTC registers.
18, 45,
48
GND
Ground
24
CER
Active-Low Chip-Enable RAM.
CE is passed through to CER, with an added
propagation delay. When the signals on A0–A18 match an RTC address,
CER is held
high, disabling the SRAM. If
OE is also low, the RTC outputs data on DQ0–DQ7.
25
OER
Active-Low Output-Enable RAM.
OE is passed through to OER, with an added
propagation delay. When the signals on A0–A18 match an RTC address,
CER is held
high, disabling the SRAM. If
CE is also low, the RTC outputs data on DQ0–DQ7.
26
CE
Active-Low Chip-Enable Input. Used to access the RTC and the external SRAM.
28
OE
Active-Low Output-Enable Input. Used to access the RTC and the external SRAM.
33
IRQ/FT
Active-Low Interrupt/Frequency-Test Output. This pin is used to output the alarm
interrupt or the frequency test signal. It is open drain and requires an external pullup
resistor.
34
WE
Active-Low Write Enable. Used to write data to the RTC registers.
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