FM32L278/L276/L274/L272 - 3V I2C Companion
DC Operating Conditions, continued (TA = -40° C to + 85° C, VDD = 2.7V to 3.6V unless otherwise specified)
Symbol Parameter
Min
Typ
Max
Units Notes
RIN
Input Resistance (pulldown)
A1-A0 for VIN = VIL max
20
1
1.175
KΩ
MΩ
V
A1-A0 for VIN = VIH min
Power Fail Input Reference Voltage
Power Fail Input (PFI) Hysteresis (Rising)
VPFI
1.20
-
1.225
100
VHYS
mV
Notes
1. SCL toggling between VDD-0.3V and VSS, other inputs VSS or VDD-0.3V.
2. All inputs at VSS or VDD, static. Stop command issued.
3. VIN or VOUT = VSS to VDD. Does not apply to A0, A1, or /RST pins.
4. VBAK = 3.0V, VDD < 2.4V, oscillator running, CNT1-2 at VBAK
.
5. /RST is asserted low when VDD < VTP
6. The minimum VDD to guarantee the level of /RST remains a valid VOL level.
7. Full complete operation. Supervisory circuits operate to lower voltages as specified.
.
8. Includes /RST input detection of external reset condition to trigger driving of /RST signal by FM32L27x.
9. The VBAK trickle charger automatically regulates the maximum voltage on this pin for capacitor backup applications.
10. VBAK will source current when trickle charge is enabled (VBC bit=1), VDD > VBAK, and VBAK < VBAK max.
AC Parameters (TA = -40° C to + 85° C, VDD = 2.7V to 3.6V, CL = 100 pF unless otherwise specified)
Symbol Parameter
Min Max Min Max Min Max Units Notes
fSCL
tLOW
tHIGH
tAA
SCL Clock Frequency
0
4.7
4.0
100
0
1.3
0.6
400
0
0.6
0.4
1000
kHz
µs
Clock Low Period
Clock High Period
SCL Low to SDA Data Out Valid
µs
3
0.9
0.55
µs
tBUF
Bus Free Before New Transmission
Start Condition Hold Time
4.7
4.0
4.7
1.3
0.6
0.6
0.5
0.25
0.25
µs
µs
µs
tHD:STA
tSU:STA
Start Condition Setup for Repeated
Start
tHD:DAT
tSU:DAT
tR
Data In Hold Time
Data In Setup Time
Input Rise Time
0
250
0
100
0
100
ns
ns
ns
ns
µs
ns
ns
1000
300
300
300
300
100
1
1
tF
Input Fall Time
tSU:STO
Stop Condition Setup Time
4.0
0
0.6
0
0.25
0
tDH
tSP
Data Output Hold (from SCL @ VIL)
Noise Suppression Time Constant
on SCL, SDA
50
50
50
All SCL specifications as well as start and stop conditions apply to both read and write operations.
Capacitance (TA = 25° C, f=1.0 MHz, VDD = 3.0V)
Symbol
Parameter
Input/Output Capacitance
Typ
-
Max
8
Units
pF
Notes
1
CIO
Notes
1
This parameter is characterized but not tested.
Data Retention (VDD = 2.7V to 3.6V)
Symbol
TDR
Parameter
Data Retention
@ +75°C
Min
Units
Notes
45
20
10
Years
Years
Years
@ +80°C
@ +85°C
Rev. 3.0
Feb. 2009
Page 17 of 21
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
