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MAX6916EO50+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
General Description
The MAX6916 provides all the features of a real-time
clock (RTC) plus a microprocessor supervisory circuit,
NV RAM controller, and backup-battery monitor func-
tion. In addition, 96 x 8 bits of static RAM are available
for scratchpad storage. The MAX6916 communicates
with a microprocessor through an SPI™-bus-compati-
ble 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 microprocessor supervisory circuit features an
open-drain, active-low reset available in three different
reset thresholds. 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 MAX6916 has a crystal-fail-detect circuit and a
data-valid bit. The MAX6916 is available in a 20-pin
QSOP package and is guaranteed to operate over the
-40°C to +85°C extended temperature range.
Applications
Point-of-Sale Equipment
Programmable Logic Controllers
Intelligent Instruments
Fax Machines
Digital Thermostats
Industrial Controls
Features
♦ Real-Time Clock Counts
Seconds, Minutes, Hours, Date, Month, Day of
Week, and Year with Leap-Year Compensation
Through 2099
♦ 4MHz SPI-Bus-Compatible Interface at 5V, 2MHz
at 3V, and 3.3V
♦ SPI Interface Supports Modes 1 and 3 (0, 1 and 1, 1)
♦ 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
♦ µP Supervisor with Watchdog Input
♦ Programmable Time/Date Alarm Output
♦ Data Valid Bit (Loss of All Voltage Alerts User of
Corrupt Data)
♦ Crystal-Fail Detect
♦ Small 20-Pin, QSOP Surface-Mount Package
MAX6916
SPI-Compatible RTC with Microprocessor
Supervisor, Alarm, and NV RAM Controller
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3694; Rev 0; 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
MAX6916EO30+
-40°C to +85°C
20 QSOP
E20-2
MAX6916EO33+
-40°C to +85°C
20 QSOP
E20-2
MAX6916EO50+
-40°C to +85°C
20 QSOP
E20-2
Pin Configuration and Selector Guide appear at end of data
sheet.
SPI is a trademark of Motorola, Inc.
+Denotes lead-free package.
MAX6916
SPI-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 (T
A
= +70°C)
20-Pin QSOP (derate 9.1mW/°C over +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
MAX
UNITS
MAX6916EO30 2.7 3.0 3.3
MAX6916EO33 3.0 3.3 3.6
Operating Voltage Range
(Note 3)
V
CC
MAX6916EO50 4.5 5.0 5.5
V
MAX6916EO30 2.0 5.5
MAX6916EO33 2.0 5.5
Operating Voltage Range BATT
(Note 4)
V
BATT
MAX6916EO50 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
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
Timekeeping Current V
BATT
(Note 5)
I
BATT
XTAL FAIL
enabled
V
BATT
= 5.5V, V
CC
= 0 4.08
µA
V
CC
= 3.3V, V
BATT
= 0 0.35
V
CC
= 3.6V, V
BATT
= 0
0.4
XTAL FAIL
disabled
V
CC
= 5.5V, V
BATT
= 0
1.1
V
CC
= 3.3V, V
BATT
= 0 0.36
V
CC
= 3.6V, V
BATT
= 0 0.42
Active Supply Current V
CC
(Note 6)
I
CCA
XTAL FAIL
enabled
V
CC
= 5.5V, V
BATT
= 0
1.2
mA
V
CC
= 3.3V, V
BATT
= 0
20
V
CC
= 3.6V, V
BATT
= 0
25
XTAL FAIL
disabled
V
CC
= 5.5V, V
BATT
= 0
76
V
CC
= 3.3V, V
BATT
= 0
27
V
CC
= 3.6V, V
BATT
= 0
30
Standby Current V
CC
(Note 5)
I
CCS
XTAL FAIL
enabled
V
CC
= 5.5V, V
BATT
= 0
81
µA
MAX6916
SPI-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
MAX
UNITS
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)
V
BATT
- 0.1
V
CE_IN AND CE_OUT (Figures 7, 11, 12, 13)
CE_IN Leakage Current I
IL
, I
IH
Disabled, V
CC
< V
RST
,
V
CE_IN
= V
CC
or GND
-1 +1 µA
CE_IN-to-CE_OUT Resistance
V
CC
= V
CC(MIN)
, V
IH
= 0.9V
CC
, CE_OUT =
GND, V
IL
= 0.1V
CC
, CE_OUT = V
CC
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
CE_OUT Active-Low Delay after
V
CC
> V
RST
t
RP
140 200
280 ms
CE_OUT Output High Voltage V
OH
I
OH
= -100µA, V
BATT
= 2V, V
CC
= 0,
RESET = low
0.8 x
V
BATT
V
MR INPUT (Figure 7)
V
IL
0.8
MR Input Voltage
V
IH
2.0
V
MR Pullup Resistance Internal pullup resistor 50 kΩ
MR Minimum Pulse Width 1µs
MR Glitch Immunity t
GW
35 ns
MR to RESET Delay t
RD
V
CC
= V
CC(MIN)
, V
BATT
= 0
450
600 ns
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MAX6916EO50+T

Mfr. #:
Buy MAX6916EO50+T
Manufacturer:
Maxim Integrated
Description:
Real Time Clock Integrated Circuits (ICs)
Lifecycle:
New from this manufacturer.
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