FM31L278-G Ramtron, FM31L278-G Datasheet - Page 22

• Manufacturer Part Number: FM31L278-G
• Description: FRAM, MPU SUPPORT, 256K, RTC, SOIC14
• Manufacturer: Ramtron

Specifications of FM31L278-G

• Memory Size: 256Kbit
• Nvram Features: RTC
• Supply Voltage Range: 2.7V To 3.6V
• Memory Case Style: SOIC
• No. Of Pins: 14
• Operating Temperature Range: -40°C To +85°C
• Package / Case: SOIC
• Mounting Style: SMD/SMT
• Memory Configuration: 32768 X 8
• Interface Type: I2C, Serial, 2-Wire
• Rohs Compliant: Yes
• Number Of Voltages Monitored: 1
• Monitored Voltage: 2.6 V or 2.9 V
• Output Type: Active Low, Open Drain
• Manual Reset: Resettable
• Watchdog: Watchdog
• Battery Backup Switching: Yes
• Power-up Reset Delay (typ): 200 ms
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Supply Current (typ): 1500 uA
• Power Fail Detection: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Notes
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. V
AC Parameters
All SCL specifications as well as start and stop conditions apply to both read and write operations.
Capacitance
Notes
1
2
Rev. 2.0
Jan. 2011
DC Operating Conditions, continued
Symbol
V
V
R
R
V
V
Symbol
f
t
t
t
t
t
t
t
t
t
t
t
t
t
C
C
Symbol
LOW
HIGH
AA
BUF
HD:STA
SU:STA
HD:DAT
SU:DAT
R
F
SU:STO
DH
SP
SCL
RST
IN
IO
XTAL
OL
OH
PFI
HYS
SCL toggling between V
All inputs at V
V
V
/RST is asserted low when V
The minimum V
Full complete operation. Supervisory circuits, RTC, etc operate to lower voltages as specified.
Includes /RST input detection of external reset condition to trigger driving of /RST signal by FM31L27x.
The VBAK trickle charger automatically regulates the maximum voltage on this pin for capacitor backup applications.
This parameter is characterized but not tested.
The crystal attached to the X1/X2 pins must be rated as 12.5pF.
IN
BAK
BAK
or V
= 3.0V, V
will source current when trickle charge is enabled (VBC bit=1), V
OUT
Parameter
Output Low Voltage (I
Output High Voltage (I
Pull-up Resistance for /RST Inactive
Input Resistance (pulldown)
Power Fail Input Reference Voltage
Power Fail Input (PFI) Hysteresis (Rising)
Parameter
SCL Clock Frequency
Clock Low Period
Clock High Period
SCL Low to SDA Data Out Valid
Bus Free Before New Transmission
Start Condition Hold Time
Start Condition Setup for Repeated
Start
Data In Hold Time
Data In Setup Time
Input Rise Time
Input Fall Time
Stop Condition Setup Time
Data Output Hold (from SCL @ VIL)
Noise Suppression Time Constant on
SCL, SDA
Input/Output Capacitance
X1, X2 Crystal pin Capacitance
A1-A0 for V
A1-A0 for V
(T
= V
A
(T
SS
= 25° C, f=1.0 MHz, V
DD
SS
A
DD
or V
= -40° C to + 85° C, V
to V
< 2.4V, oscillator running, CNT1-2 at V
to guarantee the level of /RST remains a valid V
DD,
DD
IN
IN
DD
static. Stop command issued.
. Does not apply to A0, A1, or /RST pins.
= V
= V
-0.3V and V
DD
IL
IH
< V
OL
max
Parameter
min
OH
TP
= 3 mA)
= -2 mA)
.
DD
SS
(T
DD
, other inputs V
= 3.0V)
A
= 2.7V to 3.6V, C
= -40° C to + 85° C, V
Min
250
4.7
4.0
4.7
4.0
4.7
4.0
0
0
0
SS
BAK
or V
L
Max
1000
100
300
.
50
= 100 pF unless otherwise specified)
DD
3
1.175
FM31L278/L276/L274/L272 - 3V I2C Companion
Min
-0.3V.
2.4
50
20
DD
1
OL
-
= 2.7V to 3.6V unless otherwise specified)
level.
Min
100
1.3
0.6
1.3
0.6
0.6
0.6
DD
0
0
0
> V
Typ
25
-
BAK
Typ
Max
1.20
400
300
300
0.9
50
-
, and V
Min
0.25
0.25
0.25
100
BAK
0.6
0.4
0.5
0
0
0
Max
8
-
1.225
< V
Max
400
100
0.4
-
BAK
Max
1000
0.55
300
100
50
max.
Units
pF
pF
Units
Units
MΩ
mV
KΩ
KΩ
kHz
V
V
V
µs
µs
µs
µs
µs
µs
µs
ns
ns
ns
ns
ns
ns
Page 22 of 26
Notes
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Notes
Notes
1
1
1