DS1646-120 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Nonvolatile Timekeeping RAM

19-5595; Rev 10/10
DS1646/DS1646P
Nonvolatile Timekeeping RAM
www.maxim-ic.com
FEATURES
 Integrates 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 are
Resident in the Eight Top RAM Locations
 Totally Nonvolatile with Over 10 Years of
Operation in the Absence of Power
 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% V_CC Power Supply Tolerance
 DS1646 only (DIP Module)
PIN CONFIGURATIONS
N.C. 1
A16 ₂
A14 3
A12 4
A7 5
A6 6
A5 7
A4 8
A3 9
A2 10
A1 11
A0 ¹²
DQ0 ¹³
DQ1 14
DQ2 15
GND 16
32
V_CC
31 A15
30 N.C.
29 WE
28 A13
27 A8
26 A9
25 A11
24 ^OE
23 A10
22
CE
21 DQ7
20 DQ6
19 DQ5
18 DQ4
17 DQ3
32-Pin Encapsulated Package
Standard JEDEC Bytewide 128k x 8 RAM
Pinout
 DS1646P 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
Underwriters Laboratories (UL) Recognized
N.C.
A15
A16
PFO
V_CC
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
V_BAT
X2
20
19
17
18
N.C.
N.C.
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
ORDERING INFORMATION
34-Pin PowerCap Module Board
(Uses DS9034PCX+ or DS9034I-PCX+ PowerCap)
PART
VOLTAGE
RANGE (V)
TEMP RANGE PIN-PACKAGE TOP MARK
DS1646-120+
5.0
0°C to +70°C 32 EDIP (0.740a) DS1646+120
DS1646P-120+
5.0
0°C to +70°C
+Denotes a lead(Pb)-free/RoHS-compliant package.
*DS9034-PCX+ or DS9034I-PCX+ required (must be ordered separately).
34 PowerCap*
DS1646P+120
A “+" indicates a lead(Pb)-free product. The top mark will include a “+" symbol on lead(Pb)-free devices.
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