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DS12CR887-5+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
General Description
The DS12R885 is a functional drop-in replacement for
the DS12885 real-time clock (RTC). The device pro-
vides an RTC/calendar, one time-of-day alarm, three
maskable interrupts with a common interrupt output, a
programmable square wave, and 114 bytes of battery-
backed static RAM. The date at the end of the month is
automatically adjusted for months with fewer than 31
days, including correction for leap years. It also oper-
ates in either 24-hour or 12-hour format with an AM/PM
indicator. A precision temperature-compensated circuit
monitors the status of V
CC
. If a primary power failure is
detected, the device automatically switches to a back-
up supply. The V
BACKUP
pin supports a rechargeable
battery or a super cap and includes an integrated,
always enabled trickle charger. The DS12R885 is
accessed through a multiplexed byte-wide interface,
which supports both Intel and Motorola modes. The
DS12CR887 and DS12R887 integrate the DS12R885
die with a crystal and battery.
Applications
Embedded Systems
Utility Meters
Security Systems
Network Hubs, Bridges, and Routers
Features
♦ Trickle-Charge Capability for a Rechargeable
Battery or Super Cap
♦ Selectable Intel or Motorola Bus Timing
♦ RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year with Leap-Year Compensation to
2100
♦ Interrupt Output with Three Independently
Maskable Interrupt Flags
♦ Time-of-Day Alarm is Once-per-Second to Once-
per-Day
♦ Periodic Rates from 122µs to 500ms
♦ End-of-Clock Update Cycle Flag
♦ 14 Bytes of Clock and Control Registers
♦ 114 Bytes of General-Purpose Battery-Backed NV
RAM with Clear Input
♦ Programmable Square-Wave Output
♦ Automatic Power-Fail Detect and Switch Circuitry
♦ +5.0V or +3.3V Operation
♦ Industrial Temperature Range
♦ DS12CR887 Encapsulated DIP (EDIP) Module with
Integrated Battery and Crystal
♦ DS12R887 BGA Module Surface-Mountable
Package with Integrated Crystal and
Rechargeable Battery
DS12R885/DS12CR887/DS12R887
RTCs with Constant-Voltage Trickle Charger
______________________________________________
Maxim Integrated Products
1
DS12R885
DS83C520
±
R/W
AS
GND
X2X1
V
CC
V
CC
CRYSTAL
DS
V
BACKUP
SUPER
CAP
AD(0–7) SQW
RESET
IRQ
RCLR
CS
MOT
Typical Operating Circuit
19-5217; Rev 6; 4/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE
PIN-
PACKAGE
TOP MARK*
DS12R885S-5+ -40°C to +85°C
24 SO
(300 mils)
DS12R885-5
DS12R885S-5+
T&R
-40°C to +85°C
24 SO
(300 mils)
DS12R885-5
DS12R885S-33+ -40°C to +85°C
24 SO
(300 mils)
DS12R885-33
DS12R885S-33+
T&R
-40°C to +85°C
24 SO
(300 mils)
DS12R885-33
DS12CR887-5+ -40°C to +85°C
24 EDIP
(700 mils)
DS12CR887-5
DS12CR887-33+ -40°C to +85°C
24 EDIP
(700 mils)
DS12CR887-33
DS12R887-5 -40°C to +85°C 48 BGA DS12R887-5
DS12R887-33 -40°C to +85°C 48 BGA DS12R887-33
Pin Configurations appear at end of data sheet.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*
A “+” anywhere on the top mark indicates a lead(Pb)-free
device.
Ordering Information
DS12R885/DS12CR887/DS12R887
RTCs with Constant-Voltage Trickle Charger
2 _____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage Range on V
CC
Pin Relative to Ground .....-0.3V to +6.0V
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range
EDIP, BGA ........................................................-40°C to +85°C
SO...................................................................-55°C to +125°C
Lead Temperature (soldering, 10s) .................................+260°C
(Note: EDIP is hand or wave-soldered only.)
Soldering Temperature (reflow)
SO .................................................................................+260°C
BGA...............................................................................+240°C
DC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
-33 2.97 3.3 3.63
Supply Voltage (Note 2) V
CC
-5 4.5 5.0 5.5
V
V
BACKUP
Input Voltage
(DS12R885 Only)
V
BACKUP
(Note 2) 2.0 V
OUT
V
Input Logic 1 V
IH
(Note 2) 2.2
V
CC
+
0.3
V
Input Logic 0 V
IL
(Note 2) -0.3 +0.8 V
-33 0.7 2
V
CC
Power-Supply Current
(Note 3)
I
CC1
-5 0.8 2
mA
-5 0.250 0.5
V
CC
Standby Current (Note 4) I
CCS
-33 0.140 0.3
mA
Input Leakage I
IL
-1.0 +1.0 μA
I/O Leakage I
OL
(Note 5) -1.0 +1.0 μA
Input Current I
MOT
(Note 6) -1.0 +500 μA
Output Current at 2.4V I
OH
(Note 2) -1.0 mA
Output Current at 0.4V I
OL
(Note 2) 4.0 mA
-33 2.7 2.88 2.97
Power-Fail Voltage (Note 2) V
PF
-5 4.05 4.33 4.5
V
-33
VRT Trip Point VRT
TRIP
-5
1.3 V
Trickle-Charger Current-Limiting
Resistor
R1 DS12R885 Only 10 k
Trickle-Charger Output Voltage V
OUT
DS12R885 Only 3.05 V
DS12R885/DS12CR887/DS12R887
RTCs with Constant-Voltage Trickle Charger
_____________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (DS12R885 Only)
(V
CC
= 0V, V
BACKUP
= 3.2V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
BACKUP
Current (OSC On);
T
A
= +25°C, V
BACKUP
= 3.0V
I
BACKUP2
(Note 7) 800 1000 nA
V
BACKUP
Current (Oscillator Off) I
BACKUPDR
(Note 7) 100 nA
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 4.5V to 5.5V, T
A
= -40°C to +85°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Cycle Time t
CYC
180 DC ns
Pulse Width, DS Low or R/W
PW
EL
80 ns
Pulse Width, DS High or R/W
PW
EH
65 ns
Input Rise and Fall t
R
, t
F
30 ns
R/W Hold Time t
RWH
0 ns
R/W Setup Time Before DS/E t
RWS
10 ns
Chip-Select Setup Time Before
DS or R/W
t
CS
5 ns
Chip-Select Hold Time t
CH
0 ns
Read-Data Hold Time t
DHR
5 35 ns
Write-Data Hold Time t
DHW
0 ns
Address Valid Time to AS Fall t
ASL
20 ns
Address Hold Time to AS Fall t
AHL
5 ns
Delay Time DS/E to AS Rise t
ASD
10 ns
Pulse Width AS High PW
ASH
30 ns
Delay Time, AS to DS/E Rise t
ASED
35 ns
Output Data Delay Time from DS
or R/W
t
DDR
(Note 8) 15 60 ns
Data Setup Time t
DSW
50 ns
Reset Pulse Width t
RWL
5 μs
IRQ Release from DS t
IRDS
0 2 μs
IRQ Release from RESET t
IRR
0 2 μs
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

DS12CR887-5+

Mfr. #:
Buy DS12CR887-5+
Manufacturer:
Maxim Integrated
Description:
Real Time Clock RTC w/Constant V Trickle Charger
Lifecycle:
New from this manufacturer.
Delivery:
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