DS1643P 반도체 회로 부품 판매점
Nonvolatile Timekeeping RAMs
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 Maxim Integrated Products |
19-5058; Rev 5/10
www.DataSheet4U.com
DS1643/DS1643P
Nonvolatile Timekeeping RAMs
www.maxim-ic.com
FEATURES
Integrated NV SRAM, Real-Time Clock,
Crystal, Power-Fail Control Circuit and
Lithium Energy Source
Clock Registers are Accessed Identically to the
Static RAM. These Registers Reside in the
Eight Top RAM Locations.
Totally Nonvolatile with Over 10 Years of
Operation in the Absence of Power
Access Times of 85ns and 100ns
BCD-Coded Year, Month, Date, Day, Hours,
Minutes, and Seconds with Leap Year
Compensation Valid Up to 2100
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
DS1643 Only (DIP Module)
Standard JEDEC Byte-Wide 8K x 8 RAM
Pinout
UL Recognized
DS1643P Only (PowerCap Module Board)
Surface Mountable Package for Direct
Connection to PowerCap Containing
Battery and Crystal
Replaceable Battery (PowerCap)
Power-Fail Output
Pin-for-Pin Compatible with Other Densities of
DS164XP Timekeeping RAM
PIN CONFIGURATIONS
N.C.
TOP VIEW A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1 28
2
3
27
DS1643 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
VCC
WE
CE2
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
Encapsulated DIP
(700-mil Extended)
N.C.
N.C.
N.C.
PFO
VCC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
1
2
3 DS1643P
4
5
6
7
8
9
10
11
12
13
14
15 X1 GND VBAT X2
16
17
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
PowerCap Module Board
(Uses DS9034PCX PowerCap)
N.C.
N.C.
N.C.
N.C.
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
ORDERING INFORMATION
PART
VOLTAGE RANGE
(V)
TEMP RANGE
PIN-PACKAGE
DS1643-85+
5.0
0°C to +70°C
28 EDIP (0.740)
DS1643-100+
5.0
0°C to +70°C
28 EDIP (0.740)
DS1643P-85+
5.0
0°C to +70°C
34-PowerCap*
DS1643P-100+
5.0
0°C to +70°C
34-PowerCap*
*DS9034I-PCX+ and DS9034-PCX+ required (must be ordered separately).
+Denotes a lead(Pb)-free/RoHS-compliant package. The top mark will include a “+” symbol on lead-free devices.
TOP MARK
DS1643+85
DS1643+100
DS1643P+85
DS1643P+100
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PIN DESCRIPTION
PIN
PDIP PowerCap
NAME
1
1, 2, 3,
31–34
N.C.
2 30 A12
3 25 A7
4 24 A6
5 23 A5
6 22 A4
7 21 A3
8 20 A2
9 19 A1
10 18 A0
21 28 A10
23 29 A11
24 27 A9
25 26 A8
11 16 DQ0
12 15 DQ1
13 14 DQ2
15 13 DQ3
16 12 DQ4
17 11 DQ5
18 10 DQ6
19 9 DQ7
20 8 CE
22 7 OE
26 — CE2
27 6 WE
28 5 VCC
— 4 PFO
14 17 GND
—
X1, X2,
VBAT
No Connection
FUNCTION
Address Inputs
Data Input/Output
Active-Low Chip-Enable Input
Active-Low Output-Enable Input
Chip-Enable 2 Input (Active High)
Active-Low Write-Enable Input
Power-Supply Input
Active-Low Power-Fail Output. This open-drain pin requires a
pullup resistor for proper operation.
Ground
Crystal Connection, Battery Connection
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제조업체: Maxim Integrated Products
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DS1643P data
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국내 전력반도체 판매점
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전화번호 : 051-319-2877
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