FM33256B-G Cypress Semiconductor, FM33256B-G Datasheet - Page 26

• Manufacturer Part Number: FM33256B-G
• Description: Real Time Clock 256Kb F-RAM Processor Companion
• Manufacturer: Cypress Semiconductor

Specifications of FM33256B-G

• Rohs: yes
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-14
• Factory Pack Quantity: 56

Capacitance (T
Notes
1
2
Supervisor Timing (T
Notes
1
2
3
4
Data Retention (V
AC Test Conditions
Input Pulse Levels
Input Rise and Fall Times
Input and Output Timing Levels
Output (SO) Load Capacitance
Diagram Notes
All timing parameters apply to both read and write cycles. Clock specifications are identical for read and write cycles. Write
timing parameters apply to op-code, word address, and write data bits. Functional relationships are illustrated in the relevant data
sheet sections. These diagrams illustrate the timing parameters only.
This product conforms to specifications per the terms of the Ramtron
standard warranty. The product has completed Ramtron’s internal
qualification testing and has reached production status.
Rev. 3.0
Aug. 2012
C
C
C
t
t
t
t
t
t
f
Symbol
T
Symbol
Symbol
RPU
RNR
VR
VF
WDST
WDET
CNT
DR
IO
XTL
CNT
This parameter is characterized but not tested.
The crystal attached to the X1/X2 pins must be rated as 12.5pF.
This parameter is characterized but not tested.
Slope measured at any point on V
t
satisfied. The StartTime has a resolution of 25ms. The EndTime has a resolution of 60ms.
The /RST pin will drive low for this length of time after the internal reset circuit is activated due to a watchdog, low voltage,
or manual reset event.
DOG1
is the programmed StartTime and t
Input/Output Capacitance
X1, X2 Crystal pin Capacitance
Max. Allowable Capacitance on CNT (polled mode)
/RST
/RST Response Time to V
V
V
Watchdog StartTime
Watchdog EndTime
Frequency of Event Counter
DD
DD
Parameter
Data Retention
@ +75°C
@ +80°C
@ +85°C
A
Rise Time
Fall Time
= 25° C, f=1.0 MHz, V
Active (low) after V
DD
= 2.7V to 3.6V)
A
= -40° C to + 85° C, V
Parameter
Parameter
DD
waveform.
10% and 90% of V
5 ns
0.5 V
30 pF
DD
DD
>V
DOG2
DD
<V
TP
DD
= 3.0V)
TP
is the programmed EndTime in registers 0Bh and 0Ch, V
DD
(noise filter)
= 2.7V to 3.6V)
DD
Min
38
19
10
0.3*t
Typ
t
Min
25
100
DOG2
30
50
-
-
7
0
DOG1
1850 Ramtron Drive, Colorado Springs, CO 80921
FM33256B SPI Companion w/ FRAM
Units
Years
Years
Years
Ramtron International Corporation
3.3*t
Max
100,000
100
Max
t
8
-
100
DOG1
25
1
-
DOG2
(800) 545-FRAM, [phone]
Notes
Units
pF
pF
pF
Units
µs/V
µs/V
DD
kHz
ms
ms
ms
µs
> V
www.ramtron.com
TP
, and t
Notes
Page 26 of 28
1, 2
Notes
1
1,2
1,2
4
1
3
3
RPU