fm3316 Ramtron Corporation, fm3316 Datasheet - Page 24

• Manufacturer Part Number: fm3316
• Description: 3v Integrated Processor Companion With Memory
• Manufacturer: Ramtron Corporation

Notes
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
AC Parameters (T
Notes
1.
2.
3.
Supervisor Timing (T
Notes
1
2
Rev. 1.1
Dec. 2007
DC Operating Conditions, continued
Symbol
V
V
R
V
V
Symbol
f
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
f
Symbol
CH
CL
CSU
CSH
OD
ODV
OH
D
R
F
SU
H
RPW
RNR
VR
VF
WDST
WDET
CK
CNT
RST
OL
OH
PFI
HYS
Full complete operation. Supervisory circuits, RTC, etc operate to lower voltages as specified.
SCK toggling between V
All inputs at V
The VBAK trickle charger automatically regulates the maximum voltage on this pin for capacitor backup applications.
V
V
This is the V
This is the V
/RST is asserted active when V
The minimum V
V
Includes /RST input detection of external reset condition to trigger driving of /RST signal by FM33xx.
t
This parameter is characterized but not 100% tested.
Rise and fall times measured between 10% and 90% of waveform.
This parameter is characterized but not tested.
Slope measured at any point on V
CH
BAK
BAK
IN
+ t
or V
= 3.0V, V
will source current when trickle charge is enabled (VBC bit=1), V
CL
Parameter
Output Low Voltage @ I
Output High Voltage
Pull-up resistance for /RST inactive
Power Fail Input Reference Voltage
Power Fail Input (PFI) Hysteresis (Rising)
OUT
= 1/f
(SO, PFO) @ I
/RST Pulse Width (active low time)
/RST Response Time to V
V
V
Watchdog StartTime
Watchdog EndTime
Frequency of Event Counter
Parameter
SCK Clock Frequency
Clock High Time
Clock Low Time
Chip Select Setup
Chip Select Hold
Output Disable Time
Output Data Valid Time
Output Hold Time
Deselect Time
Data In Rise Time
Data In Fall Time
Data Setup Time
Data Hold Time
DD
DD
= V
DD
DD
CK
SS
Rise Time
Fall Time
supply current contributed by enabling the trickle charger circuit, and does not account for I
supply current contributed by enabling the watchdog circuit, WDE=1 and WDET set to a non-zero value.
DD
.
SS
DD
A
or V
= -40 C to + 85 C, V
to V
< V
to guarantee the level of /RST remains a valid V
A
DD,
= -40 C to + 85 C, V
SW
DD
static. Trickle charger off (VBC=0).
DD
, oscillator running, CNT at VBAK.
. Does not apply to PFI, X1, or X2.
OH
-0.3V and V
= -2 mA
DD
Parameter
DD
< V
OL
waveform.
TP
DD
= 3 mA
(T
SS
.
<V
, other inputs V
A
DD
= -40 C to + 85 C, V
TP
= 2.7V to 3.6V C
DD
(noise filter)
= 2.7V to 3.6V)
SS
or V
V
DD
L
DD
1.475
-0.3V.
= 30 pF)
DD
Min
OL
50
-
– 0.8
= 2.7V to 3.6V unless otherwise specified)
FM33256/FM3316 SPI Companion w/ FRAM
level.
DD
0.3*t
t
Min
> V
100
DOG2
30
50
Min
7
0
28
28
10
10
90
DOG1
0
0
6
6
BAK
Typ
1.50
, and V
-
3.3*t
Max
t
BAK
Max
100
DOG1
25
16
20
50
50
24
1
-
-
DOG2
1.525
< V
Max
400
100
0.4
-
BAK
max.
Units
Units
MHz
kHz
ms
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
s/V
s/V
s
Units
BAKTC
K
mV
V
V
V
Page 24 of 28
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Notes
Notes
1,3
1,3
1,2
1,2
Notes
1
1
2
1
3
3