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BQ4830YMA-85 Datasheet

  • BQ4830YMA-85

  • RTC Module With 32Kx8 NVSRAM

  • 16頁

  • TI

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bq4830Y
RTC Module With 32Kx8 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 32K x 8 SRAMs
廬
Unlimited write cycles
廬
10-year minimum data retention
and clock operation in the ab-
sence of power
廬
Automatic power-fail chip dese-
lect and write-protection
廬
Software clock calibration for
greater than 1 minute per month
accuracy
廬
10% tolerance of V
CC
for write-
protect
General Description
The bq4830Y RTC Module is a non-
volatile 262,144-bit SRAM organ-
ized as 32,768 words by 8 bits with
an integral accessible real-time
clock.
The device combines an internal
lithium battery, quartz crystal, clock
and power-fail chip, and a full
CMOS SRAM in a plastic 28-pin
DIP module. The RTC Module di-
rectly replaces industry-standard
SRAMs and also fits into many
EPRO M and E E P R OM s o ckets
without any requirement for special
write timing or limitations on the
number of write cycles.
Registers for the real-time clock and
clock calibration are located in regis-
ters 7FF8h鈥?FFFh of the memory ar-
ray.
The clock registers are dual-port
read/write SRAM locations that are
updated once per second by a clock
control circuit from the internal
clock counters. The dual-port regis-
ters allow clock updates to occur
without interrupting normal access
to the rest of the SRAM array.
The bq4830Y 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
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
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
Pin Names
A
0
鈥揂
14
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
28-Pin DIP Module
PN483001.eps
Sept. 1996 B
1

BQ4830YMA-85 產(chǎn)品屬性

  • Clock Basics in 10 minutes or less

  • 14

  • 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

  • 28-DIP 模塊（0.61"，15.49mm）

  • 28-DIP 模塊（18.42x37.72）

  • 托盤

  • 296-6533-5

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