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دیتاشیت - Dallas - Y2KC Nonvolatile Timekeeping RAM

شماره قطعه DS1743
شرح مفصل Y2KC Nonvolatile Timekeeping RAM
تولید کننده Dallas 
آرم Dallas 


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DS1743 شرح
DS1743/DS1743P
Y2KC Nonvolatile Timekeeping RAM
www.dalsemi.com
FEATURES
Integrated NV SRAM, real time clock, crystal, power-
fail control circuit and lithium energy source
Clock registers are accessed identical to the static
RAM. These registers are resident in the eight top
RAM locations.
Century byte register
Totally nonvolatile with over 10 years of operation in
the absence of power
BCD coded century, year, month, date, day, hours,
minutes, and seconds with automatic leap year
compensation valid up to the year 2100
Battery voltage level indicator flag
Power-fail write protection allows for ±10% VCC
power supply tolerance
Lithium energy source is electrically disconnected to
retain freshness until power is applied for the first time
DIP Module only
Standard JEDEC bytewide 8k x 8 static RAM
pinout
PowerCapModule Board only
Surface mountable package for direct connection
to PowerCap containing battery and crystal
Replaceable battery (PowerCap)
Power-On Reset Output
Pin for pin compatible with other densities of
DS174XP Timekeeping RAM
ORDERING INFORMATION
DS1743P-XXX (5V)
-70 70 ns access
-100 100 ns access
blank 28-pin DIP Module
P 34-pin PowerCap Module
board*
*DS1743WP-XXX
(3.3V)
-120 120 ns access
-150 150 ns access
blank 28-pin DIP Module
P 34-pin PowerCap Module
board*
*DS9034PCX (PowerCap) Required:
(must be ordered separately)
PIN ASSIGNMENT
NC
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VCC
27 WE
26 CE2
25 A8
24 A9
23 A11
22 OE
21 A10
20 CE
19 DQ7
18 DQ6
17 DQ5
16 DQ4
15 DQ3
28-Pin Encapsulated Package
(700-mil Extended)
NC
NC
NC
RST
VCC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
1 34
2 33
3 32
4 31
5 30
6 29
7 28
8 27
9 26
10 25
11 24
12 23
13 22
14 21
15
16
X1 GND VBAT X2
20
19
17 18
34-Pin Powercap Module Board
(Uses DS9034PCX Powercap)
NC
NC
NC
NC
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
PIN DESCRIPTION
A0-A12
- Address Input
CE - Chip Enable
CE2 - Chip Enable 2 (DIP
Module only)
OE - Output Enable
WE - Write Enable
VCC
GND
- Power Supply Input
- Ground
DQ0-DQ7 - Data Input/Output
NC - No Connection
RST - Power-On Reset Output
(PowerCap Module board only)
X1, X2
- Crystal Connection
VBAT
- Battery Connection
1 of 17
022301

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