參數(shù)資料
型號: DS1558W-TRL
廠商: Maxim Integrated Products
文件頁數(shù): 11/18頁
文件大?。?/td> 0K
描述: IC RTC W/NV RAM 3.3V 48-LQFP
標(biāo)準(zhǔn)包裝: 2,000
類型: 時鐘/日歷
特點: 警報器,閏年,監(jiān)視計時器,Y2K
時間格式: HH:MM:SS(24 小時)
數(shù)據(jù)格式: YY-MM-DD-dd
接口: 并聯(lián)
電源電壓: 2.97 V ~ 3.63 V
電壓 - 電源,電池: 2.5 V ~ 3.7 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-LQFP
供應(yīng)商設(shè)備封裝: 48-LQFP(7x7)
包裝: 帶卷 (TR)
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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