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BQ4850YMA-85 Datasheet

  • BQ4850YMA-85

  • RTC Module With 512Kx8 NVSRAM

  • 16頁

  • TI

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bq4850Y
RTC Module With 512Kx8 NVSRAM
Features
廬
Integrated SRAM, real-time
clock, crystal, power-fail control
circuit, and battery
廬
Real-Time Clock counts seconds
through years in BCD format
廬
RAM-like clock access
廬
Pin-compatible with industry-
standard 512K x 8 SRAMs
廬
Unlimited write cycles
廬
10-year minimum data retention
and clock operation in the absence
of power
廬
Automatic power-fail chip dese-
lect and write-protection
廬
Software clock calibration for
g r e a t e r t ha n
鹵
1 m inut e pe r
month accuracy
General Description
The bq4850Y RTC Module is a non-
volatile 4,194,304-bit SRAM organ-
ized as 524,288 words by 8 bits with
an integral accessible real-time
clock.
The device combines an internal lith-
ium battery, quartz crystal, clock and
power-fail chip, and a full CMOS
SRAM in a plastic 32-pin DIP mod-
ule. The RTC Module directly re-
places industry-standard SRAMs and
also fits into many EPROM and EE-
PROM sockets without any require-
ment for special write timing or limi-
tations on the number of write cycles.
Registers for the real-time clock,
alarm and other special functions
are located in registers 7FFF8h鈥?/div>
7FFFFh of the memory array.
The clock and alarm registers are
dual-port read/write SRAM loca-
tions that are updated once per sec-
ond by a clock control circuit from
the internal clock counters. The
dual-port registers allow clock up-
dates to occur without interrupting
normal access to the rest of the
SRAM array.
The bq4850Y also contains a power-
fail-detect circuit. The circuit dese-
lects the device whenever V
CC
falls
below tolerance, providing a high de-
gree of data security. The battery is
electrically isolated when shipped
from the factory to provide maxi-
mum battery capacity. The battery
remains disconnected until the first
application of V
CC
.
Pin Connections
Pin Names
A
0
鈥揂
18
CE
WE
OE
DQ
0
鈥揇Q
7
V
CC
V
SS
Address input
Chip enable
Write enable
Output enable
Data in/data out
+5 volts
Ground
A18
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VCC
A15
A17
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
32-Pin DIP Module
PN485001.eps
Aug. 1996
1

BQ4850YMA-85 產(chǎn)品屬性

  • Clock Basics in 10 minutes or less

  • 12

  • 集成電路 (IC)

  • 時鐘/計時 - 實時時鐘

  • -

  • 時鐘/日歷

  • 警報器

  • -

  • HH:MM:SS（24 小時）

  • YY-MM-DD-dd

  • 并聯(lián)

  • 4.5 V ~ 5.5 V

  • -

  • 0°C ~ 70°C

  • 通孔

  • 32-DIP 模塊（0.61"，15.49mm）

  • 32-DIP 模塊（18.42x42.8）

  • 托盤

  • 296-6543-5

BQ4850YMA-85相關(guān)型號PDF文件下載

  • 型號
    版本
    描述
    廠商
    下載
  • 英文版
    Parallel RTC With CPU Supervisor
    TI
  • 英文版
    Parallel RTC With CPU Supervisor
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    RTC Module With CPU Supervisor
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    集成了電池和晶體的 SNAPHAT
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    RTC Module With 8Kx8 NVSRAM
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  • 英文版
    RTC Module With 32Kx8 NVSRAM
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  • 英文版
    RTC Module With 32Kx8 NVSRAM
    TI [Texas ...
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    RTC Module With 32Kx8 NVSRAM
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  • 英文版
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    RTC Module With 128Kx8 NVSRAM
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  • 英文版
    RTC Module With 128Kx8 NVSRAM
    TI [Texas ...
  • 英文版
    Parallel RTC With CPU Supervisor
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  • 英文版
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    RTC Module With CPU Supervisor
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  • 英文版
    RTC Module With CPU Supervisor
  • 英文版
    RTC Module With 512Kx8 NVSRAM
    TI

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