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參數(shù)資料
| 型號(hào)： | BQ4285Q |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | XO, clock |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁(yè)數(shù)： | 1/26頁(yè) |
| 文件大小： | 1079K |
| 代理商： | BQ4285Q |
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1
Features
Direct clock/calendar replace-
ment for IBM
AT-compatible
computers and other applications
Functionally compatible with the
DS1285
- Closely matches MC146818A
pin configuration
114 bytes of general nonvolatile
storage
Automatic backup and write-
protect control to external SRAM
160 ns cycle time allows fast bus
operation
Selectable Intel or Motorola bus
timing (PLCC), Intel bus timing
(DIP and SOIC)
Less than 0.5
A load under bat-
tery operation
14 bytes for clock/calendar and
control
Calendar in day of the week, day of
the month, months, and years, with
automatic leap-year adjustment
Time of day in seconds, minutes,
and hours
- 12- or 24-hour format
- Optional daylight saving
adjustment
BCD or binary format for clock
and calendar data
Programmable square wave out-
put
Three individually maskable in-
terrupt event flags:
- Periodic rates from 122 s to
500 ms
- Time-of-day alarm once per
second to once per day
- End-of-clock update cycle
24-pin plastic DIP or SOIC
General Description
The CMOS bq4285 is a low-power
microprocessor peripheral providing
a time-of-day clock and 100-year cal-
endar with alarm features and bat-
tery operation. Other features include
three maskable interrupt sources,
square wave output, and 114 bytes of
general nonvolatile storage.
The bq4285 write-protects the clock,
calendar, and storage registers dur-
ing power failure. A backup battery
then maintains data and operates
the clock and calendar.
The bq4285 is a fully compatible real-
time clock for IBM AT-compatible com-
puters and other applications. The only
external components are a 32.768kHz
crystal and a backup battery.
The bq4285 integrates a battery-
backup controller to make a standard
CMOS SRAM nonvolatile during
power-fail conditions. During power-
fail, the bq4285 automatically write-
protects the external SRAM and pro-
vides a VCC output sourced from the
clock backup battery.
PN428502.eps
28-Pin PLCC
5
6
7
8
9
10
11
25
24
23
22
21
20
19
4
3
2
1
28
27
26
12
13
14
15
16
17
18
AD0
AD1
AD2
AD3
AD4
AD5
NC
AD
6
NC
AD
7
V
SS
CS
AS
NC
CEIN
BC
INT
RST
DS
VSS
R/ W
X2
X1
MOT
V
OUT
V
CC
SQW
CE
OUT
Pin Names
AD0–AD7
Multiplexed address/data
input/output
MOT
Bus type select input
(PLCC only )
CS
Chip select input
AS
Address strobe input
DS
Data strobe input
R/W
Read/write input
INT
Interrupt request output
RST
Reset input
SQW
Square wave output
BC
3V backup cell input
X1–X2
Crystal inputs
NC
No connect
CEIN
RAM chip enable input
CEOUT
RAM chip enable output
VOUT
Supply output
VCC
+5V supply
VSS
Ground
Jan. 1999 D
1
PN428501.eps
24-Pin DIP or SOIC
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
9
10
16
15
11
12
14
13
VCC
SQW
CEOUT
BC
INT
RST
DS
VSS
R/W
AS
CS
VOUT
X1
X2
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
VSS
CEIN
Pin Connections
bq4285
Real-Time Clock (RTC) With NVRAM Control
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| BRN1-09P-TA1 | 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG |
| BRN1-09P-TA2 | 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG |
| BRN1-09P-TA3 | 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG |
| BRN1-09P-TA4 | 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG |
| BRN1-09P-TB1 | 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BQ4285Q- | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Real-Time Clock RTC With NVRAM Control |
| BQ4285S- | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Real-Time Clock RTC With NVRAM Control |
| BQ4285S-SB2 | 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC: 114x8 NVSRAM & NVSRAM Control 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 |
| BQ4285S-SB2G4 | 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC: 114x8 NVSRAM & NVSRAM Control 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 |
| BQ4285S-SB2TR | 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC: 114x8 NVSRAM & NVSRAM Control 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 |
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