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MCP79400/MCP79401/MCP79402
Battery-Backed I2C Real-Time Clock/Calendar with
SRAM and Protected EEPROM
Device Selection Table
Part Number
MCP79400
MCP79401
MCP79402
Protected EEPROM
Unprogrammed
EUI-48
EUI-64
Timekeeping Features
• Real-Time Clock/Calendar (RTCC):
- Hours, Minutes, Seconds, Day of Week, Day,
Month, Year
- Leap year compensated to 2399
- 12/24-hour modes
• Oscillator for 32.768 kHz Crystals:
- Optimized for 6-9 pF crystals
• On-Chip Digital Trimming/Calibration:
- ±1 ppm resolution
- ±129 ppm
• Dual Programmable Alarms
• Versatile Output Pin:
- Clock output with selectable frequency
- Alarm output
- General purpose output
• Power-Fail Time-Stamp:
- Time logged on switchover to and from
Battery mode
Low-Power Features
• Wide Voltage Range:
- Operating voltage range of 1.8V to 5.5V
- Backup voltage range of 1.3V to 5.5V
• Low Typical Timekeeping Current:
- Operating from VCC: 1.2 µA at 3.3V
- Operating from battery backup: 925 nA at
3.0V
• Automatic Switchover to Battery Backup
User Memory
• 64-Byte Battery-Backed SRAM
• 64-Bit Protected EEPROM Area:
- Robust write unlock sequence
- EUI-48MAC address (MCP79401)
- EUI-64MAC address (MCP79402)
- Custom programming available
Operating Ranges
• 2-Wire Serial Interface, I2C Compatible:
- I2C clock rate up to 400 kHz
• Temperature Range:
- Industrial (I): -40°C to +85°C
Packages
• 8-Lead SOIC, MSOP, TSSOP and 2x3 TDFN
General Description
The MCP7940X Real-Time Clock/Calendar (RTCC)
tracks time using internal counters for hours, minutes,
seconds, days, months, years, and day of week.
Alarms can be configured on all counters up to and
including months. For usage and configuration, the
MCP7940X supports I2C communications up to
400 kHz.
The open-drain, multi-functional output can be
configured to assert on an alarm match, to output a
selectable frequency square wave or as a general
purpose output.
The MCP7940X is designed to operate using a
32.768 kHz tuning fork crystal with external crystal
load capacitors. On-chip digital trimming can be used
to adjust for frequency variance caused by crystal
tolerance and temperature.
SRAM and timekeeping circuitry are powered from the
back-up supply when main power is lost, allowing the
device to maintain accurate time and the SRAM
contents. The times when the device switches over to
the back-up supply and when primary power returns
are both logged by the power-fail time-stamp.
The MCP7940X features 64 bits of EEPROM which is
only writable after an unlock sequence, making it ideal
for storing a unique ID or other critical information. The
MCP79401 and MCP79402 are pre-programmed with
EUI-48 and EUI-64 addresses, respectively. Custom
programming is also available.
Package Types
SOIC, TSSOP, MSOP
X1
X2
VBAT
VSS
1
2
3
4
8 VCC
7 MFP
6 SCL
5 SDA
TDFN
X1 1
X2 2
VBAT 3
VSS 4
8 VCC
7 MFP
6 SCL
5 SDA
2011-2016 Microchip Technology Inc.
DS20005009F-page 1

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MCP79400/MCP79401/MCP79402
FIGURE 1-1:
TYPICAL APPLICATION SCHEMATIC
VCC
PIC® MCU
VCC
VCC
8
VCC
X1 1
6 SCL
5
MCP7940X
SDA
X2
2
7 MFP
VBAT 3
VSS
4
CX1
CX2
VBAT
FIGURE 1-2:
BLOCK DIAGRAM
VCC
VSS
VBAT
Power Control
and Switchover
Power-Fail
Time-Stamp
SCL
SDA
X1
X2
I2C Interface
and Addressing
32.768 kHz
Oscillator
Control Logic
SRAM
EEPROM
Clock Divider
Digital Trimming
Square Wave
Output
Alarms
MFP
Output Logic
Configuration
Seconds
Minutes
Hours
Day of Week
Date
Month
Year
DS20005009F-page 2
2011-2016 Microchip Technology Inc.

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MCP79400/MCP79401/MCP79402
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings (†)
VCC............................................................................................................................................................................. 6.5V
All inputs and outputs (except SDA and SCL) w.r.t. VSS.....................................................................-0.6V to VCC +1.0V
SDA and SCL w.r.t. VSS ............................................................................................................................... -0.6V to 6.5V
Storage temperature ...............................................................................................................................-65°C to +150°C
Ambient temperature with power applied................................................................................................-40°C to +125°C
ESD protection on all pins........................................................................................................................................ 4 kV
† NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at those or any other conditions above those
indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for
extended periods may affect device reliability.
TABLE 1-1: DC CHARACTERISTICS
DC CHARACTERISTICS
Electrical Characteristics:
Industrial (I):
VCC = +1.8V to 5.5V
TA = -40°C to +85°C
Param.
No.
Symbol
Characteristic
Min. Typ.(2) Max. Units
Conditions
D1
VIH High-Level Input Voltage
0.7 VCC
V
D2 VIL Low-Level Input Voltage — — 0.3 VCC V VCC 2.5V
— — 0.2 VCC V VCC < 2.5V
D3 VHYS Hysteresis of Schmitt
Trigger Inputs
(SDA, SCL pins)
0.05 VCC — — V Note 1
D4 VOL Low-Level Output Voltage — — 0.40 V IOL = 3.0 mA; VCC = 4.5V
(MFP, SDA pins)
IOL = 2.1 mA; VCC = 2.5V
D5 ILI Input Leakage Current
— — ±1 µA VIN = VSS or VCC
D6 ILO Output Leakage Current — — ±1 µA VOUT = VSS or VCC
D7 CIN, Pin Capacitance
COUT (SDA, SCL, MFP pins)
— — 10 pF VCC = 5.0V (Note 1)
TA = 25°C, f = 1 MHz
D8
COSC Oscillator Pin Capacitance
3 — pF Note 1
(X1, X2 pins)
D9 ICCEERD EEPROM Operating
ICCEEWR Current
D10 ICCREAD SRAM/RTCC Register
ICCWRITE Operating Current
D11 ICCDAT VCC Data-Retention Current
(oscillator off)
— 400 µA VCC = 5.5V, SCL = 400 kHz
— 3 mA VCC = 5.5V
— 300 µA VCC = 5.5V, SCL = 400 kHz
— 400 µA VCC = 5.5V, SCL = 400 kHz
— 1 µA SCL, SDA, VCC = 5.5V
D12 ICCT Timekeeping Current
D13 VTRIP Power-Fail Switchover
Voltage
— 1.2 — µA VCC = 3.3V (Note 1)
1.3 1.5 1.7 V
D14 VBAT Backup Supply Voltage
Range
1.3 — 5.5 V Note 1
Note 1: This parameter is not tested but ensured by characterization.
2: Typical measurements taken at room temperature.
2011-2016 Microchip Technology Inc.
DS20005009F-page 3

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MCP79400/MCP79401/MCP79402
TABLE 1-1: DC CHARACTERISTICS
DC CHARACTERISTICS (Continued)
Electrical Characteristics:
Industrial (I):
VCC = +1.8V to 5.5V
TA = -40°C to +85°C
Param.
No.
Symbol
Characteristic
D15 IBATT Timekeeping Backup
Current
Min.
Typ.(2) Max.
— 850
— 925 1200
— — 9000
D16 IBATDAT VBAT Data-Retention
Current (oscillator off)
— — 750
Note 1: This parameter is not tested but ensured by characterization.
2: Typical measurements taken at room temperature.
Units
Conditions
nA VBAT = 1.3V, VCC = VSS
(Note 1)
nA VBAT = 3.0V, VCC = VSS
(Note 1)
nA VBAT = 5.5V, VCC = VSS
(Note 1)
nA VBAT = 3.6V, VCC = VSS
DS20005009F-page 4
2011-2016 Microchip Technology Inc.

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MCP79400/MCP79401/MCP79402
TABLE 1-1: AC CHARACTERISTICS
AC CHARACTERISTICS
Electrical Characteristics:
Industrial (I):
VCC = +1.8V to 5.5V TA = -40°C to +85°C
Param.
No.
Symbol
Characteristic
Min.
Typ. Max. Units
Conditions
1 FCLK Clock Frequency
2 THIGH Clock High Time
3 TLOW Clock Low Time
4 TR SDA and SCL Rise Time
(Note 1)
5 TF SDA and SCL Fall Time
(Note 1)
6 THD:STA Start Condition Hold Time
7 TSU:STA Start Condition Setup Time
8 THD:DAT Data Input Hold Time
9 TSU:DAT Data Input Setup Time
10 TSU:STO Stop Condition Setup Time
11 TAA Output Valid from Clock
12 TBUF Bus Free Time: Bus time
must be free before a new
transmission can start
4000
600
4700
1300
4000
600
4700
600
0
250
100
4000
600
4700
1300
— 100 kHz 1.8V VCC < 2.5V
— 400 kHz 2.5V VCC 5.5V
— — ns 1.8V VCC < 2.5V
— — ns 2.5V VCC 5.5V
— — ns 1.8V VCC < 2.5V
— — ns 2.5V VCC 5.5V
— 1000 ns 1.8V VCC < 2.5V
— 300 ns 2.5V VCC 5.5V
— 1000 ns 1.8V VCC < 2.5V
— 300 ns 2.5V VCC 5.5V
— — ns 1.8V VCC < 2.5V
— — ns 2.5V VCC 5.5V
— — ns 1.8V VCC < 2.5V
— — ns 2.5V VCC 5.5V
— — ns Note 2
— — ns 1.8V VCC < 2.5V
— — ns 2.5V VCC 5.5V
— — ns 1.8V VCC < 2.5V
— — ns 2.5V VCC 5.5V
— 3500 ns 1.8V VCC < 2.5V
— 900 ns 2.5V VCC 5.5V
— — ns 1.8V VCC < 2.5V
— — ns 2.5V VCC 5.5V
13 TSP Input Filter Spike
Suppression
(SDA and SCL pins)
— — 50 ns Note 1
14 TWC Write Cycle Time (byte or
page)
— — 5 ms
15
16
17
18
19
Note 1:
2:
3:
TFVCC VCC Fall Time
300 — — µs Note 1
TRVCC VCC Rise Time
0 — — µs Note 1
FOSC Oscillator Frequency
32.768 —
kHz
TOSF Oscillator Timeout Period
1 — — ms Note 1
Endurance
1M — — cycles Page Mode,
25°C,VCC = 5.5V
(Note 3)
Not 100% tested.
As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region
(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.
This parameter is not tested but ensured by characterization.
2011-2016 Microchip Technology Inc.
DS20005009F-page 5