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MAX6917EO33+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P31
General Description
The MAX6917 provides all the features of a real-time
clock (RTC) plus a microprocessor (µP) supervisory cir-
cuit, NV RAM controller, and backup-battery monitor
function. In addition, 96 x 8 bits of static RAM are avail-
able for scratchpad storage. The MAX6917 communi-
cates with a µP through an I
2
C-bus-compatible serial
interface.
The real-time clock/calendar provides seconds, min-
utes, hours, day, date, month, and year information.
The end of the month date is automatically adjusted for
months with fewer than 31 days, including corrections
for leap years through 2099. The clock operates in
either 24hr or 12hr format with an AM/PM indicator. A
time/date-programmable alarm function is provided
with an open-drain, active-low alarm output.
The µP supervisory circuit features an open-drain,
active-low reset available in three different reset thresh-
olds. A manual reset input and a watchdog function are
included as well.
The NV RAM controller provides power for external SRAM
from a backup battery plus chip-enable gating. The back-
up battery also provides data retention of the on-board 96
x 8 bits of RAM. An open-drain, active-low, battery-on sig-
nal alerts the system when operating from a battery.
The battery-test circuitry periodically tests the backup
battery for a low-battery condition. An optional external
resistor network selects different battery thresholds. A
freshness seal prevents battery drain until the first V
CC
power-up.
The MAX6917 has a crystal-fail-detect circuit and a
data-valid bit. The MAX6917 is available in a 20-pin
QSOP package and is guaranteed to operate over the
extended (-40°C to +85°C) temperature range.
Applications
Point-of-Sale Equipment
Programmable Logic Controllers
Intelligent Instruments
Fax Machines
Digital Thermostats
Industrial Control
Features
♦ Real-Time Clock Counts
Seconds, Minutes, Hours, Date,
Month, Day of Week, and Year
with Leap-Year Compensation Through 2099
♦ Fast (400kHz) I
2
C-Bus-Compatible Interface
♦ 96 x 8 Bits of RAM for Scratchpad Data Storage
♦ Uses Standard 32.768kHz, 6pF Load, Watch
Crystal
♦ Single-Byte or Multiple-Byte (Burst Mode) Data
Transfer for Read or Write of Clock Registers or
RAM
♦ Battery Monitor and Low-Battery Warning Output
Internal Default for Lithium Backup-Battery
Testing
Pins Available for Other Backup-Battery
Testing Configurations
♦ Dual Power-Supply Pins for Primary and Backup
Power
♦ Battery-On Output
♦ NV RAM Controller
Chip-Enable Gating (Control of CE with Reset
and Power Valid)
V
OUT
for SRAM Power
♦ Microprocessor Supervisor with Watchdog Input
♦ Programmable Time/Date Alarm Output
♦ Data Valid Bit (Loss of All Voltage Alerts User of
Corrupt Data)
♦ Crystal-Fail Detect
♦ Reference Output Frequencies—1Hz and
32.768kHz
♦ Small, 20-Pin, QSOP Surface-Mount Package
MAX6917
I
2
C-Compatible RTC with Microprocessor
Supervisor, Alarm, and NV RAM Controller
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3702; Rev 1; 10/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX6917EO30+
-40°C to +85°C
20 QSOP
E20-2
MAX6917EO33+
-40°C to +85°C
20 QSOP
E20-2
MAX6917EO50+
-40°C to +85°C
20 QSOP
E20-2
Pin Configuration and Selector Guide appear at end of data
sheet.
+Denotes lead-free package.
MAX6917
I
2
C-Compatible RTC with Microprocessor
Supervisor, Alarm, and NV RAM Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
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.
V
BATT
, V
CC
to GND ...............................................-0.3V to +6.0V
All Other Pins to GND ................................-0.3V to (V
CC
+ 0.3V)
All Other Pins to GND ............................-0.3V to (V
BATT
+ 0.3V)
Input Currents
V
CC
..................................................................................200mA
V
BATT
.................................................................................20mA
GND ....................................................................................20mA
All Other Pins ....................................................................±20mA
Output Currents
V
OUT
Continuous ..........................................................200mA
All Other Outputs ............................................................20mA
Continuous Power Dissipation
20-Pin QSOP (derate 9.1mW/°C over T
A
= +70°C) .....727mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
MAX6917EO30 2.7 3.0 3.3
MAX6917EO33 3.0 3.3 3.6
Operating Voltage Range
(Note 3)
V
CC
MAX6917EO50 4.5 5.0 5.5
V
MAX6917EO30 2.0 5.5
MAX6917EO33 2.0 5.5
Operating Voltage Range BATT
(Note 4)
V
BATT
MAX6917EO50 2.0 5.5
V
V
BATT
= 2V, V
CC
= 0 1
V
BATT
= 3V, V
CC
= 0 1.4
V
BATT
= 3.6V, V
CC
= 0
1.9
1Hz, 32kHz
outputs disabled;
XTAL FAIL
disabled
V
BATT
= 5.5V, V
CC
= 0
3.8
V
BATT
= 2V, V
CC
= 0
1.23
V
BATT
= 3V, V
CC
= 0
1.61
V
BATT
= 3.6V, V
CC
= 0
2.3
1Hz, 32kHz
outputs disabled;
XTAL FAIL
enabled
V
BATT
= 5.5V, V
CC
= 0 4.08
V
BATT
= 2V, V
CC
= 0
2.82
V
BATT
= 3V, V
CC
= 0 4.7
V
BATT
= 3.6V, V
CC
= 0
6.1
Timekeeping Current V
BATT
(Note 5)
I
BATT
1Hz, 32kHz
enabled, outputs
open; XTAL FAIL
disabled
V
BATT
= 5.5V, V
CC
= 0 10.6
µA
V
CC
= 3.3V, V
BATT
= 0
0.1
V
CC
= 3.6V, V
BATT
= 0 0.12
1Hz, 32kHz
enabled, outputs
open; XTAL FAIL
enabled
V
CC
= 5.5V, V
BATT
= 0
0.2
V
CC
= 3.3V, V
BATT
= 0
0.9
V
CC
= 3.6V, V
BATT
= 0 0.11
Active Supply Current V
CC
(Note 6)
I
CCA
1Hz, 32kHz
outputs disabled;
XTAL FAIL
disabled
V
CC
= 5.5V, V
BATT
= 0 0.18
mA
MAX6917
I
2
C-Compatible RTC with Microprocessor
Supervisor, Alarm, and NV RAM Controller
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
V
CC
= 3.3V, V
BATT
= 0
27
V
CC
= 3.6V, V
BATT
= 0
30
1Hz, 32kHz
enabled, outputs
open; XTAL FAIL
enabled
V
CC
= 5.5V, V
BATT
= 0
81
V
CC
= 3.3V, V
BATT
= 0
20
V
CC
= 3.6V, V
BATT
= 0
25
Standby Current V
CC
(Note 5) I
CCS
1Hz, 32kHz
outputs disabled;
XTAL FAIL
disabled
V
CC
= 5.5V, V
BATT
= 0
76
µA
V
OUT
V
CC
= 2.7V, V
BATT
= 0, I
OUT
= 35mA
V
CC
-
0.2
V
CC
= 3.0V, V
BATT
= 0, I
OUT
= 35mA
V
CC
-
0.2
V
OUT
in V
CC
Mode (Note 4) V
OUT
V
CC
= 4.5V, V
BATT
= 0, I
OUT
= 70mA
V
CC
-
0.2
V
V
BATT
= 2V, V
CC
= 0, I
OUT
= 400µA
V
BATT
-
0.02
V
BATT
= 3V, V
CC
= 0, I
OUT
= 800µA
V
BATT
-
0.03
V
OUT
in Battery-Backup Mode
(Notes 4, 7)
V
OUT
V
BATT
= 4.5V, V
CC
= 0, I
OUT
= 1.5mA
V
BATT
-
0.05
V
V
BATT
-to-V
CC
Switchover
Threshold
V
TRU
Power-up (V
CC
< V
RST
) switch from V
BATT
to V
CC
(Note 7)
V
BATT
+ 0.1
V
V
CC
-to-V
BATT
Switchover
Threshold
V
TRD
Power-down (V
CC
< V
RST
) switch from V
CC
to V
BATT
(Note 7)
VBATT
- 0.1
V
CE_IN AND CE_OUT (Figures 10, 14, 15, 16)
CE_IN Leakage Current IIL, IIH
Disabled, V
CC
< V
RST
,
V
CE_IN
= VCC or GND
-1 +1 µA
CE_IN-to-CE_OUT Resistance
V
CC
= V
CC(MIN),
V
IH
= 0.9V
CC
,
CE_OUT connected to GND;
VIL = 0.1VCC, CE_OUT connected to VCC
46 140 Ω
CE_IN-to-CE_OUT Propagation
Delay
t
CED
50Ω source-impedance driver,
C
LOAD
= 10pF, V
CC
= V
CC(MIN)
,
V
IH
= 0.9V
CC
, V
IL
= 0.1V
CC
(Note 8); measured from 50% point on
CE_IN to the 50% point of CE_OUT
10 20
ns
RESET Active to CE_OUT High
Delay
t
RCE
MR high to low 2 10 50 µs
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MAX6917EO33+

Mfr. #:
Buy MAX6917EO33+
Manufacturer:
Maxim Integrated
Description:
Real Time Clock Integrated Circuits (ICs)
Lifecycle:
New from this manufacturer.
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