CY2291
Document #: 38-07189 Rev. *A Page 4 of 14
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Supply Voltage............................................... –0.5V to +7.0V
DC Input Voltage............................................ –0.5V to +7.0V
Storage Temperature .................................–65°C to +150°C
Max. Soldering Temperature (10 sec) ..........................260°C
Junction Temperature...................................................150°C
Package Power Dissipation......................................750 mW
Static Discharge Voltage.............................................>
2000V
(per MIL-STD-883, Method 3015)
Operating Conditions
[5]
Parameter Description Part Numbers Min. Max. Unit
V
DD
Supply Voltage, 5.0V operation All 4.5 5.5 V
V
DD
Supply Voltage, 3.3V operation All 3.0 3.6 V
V
BATT
Battery Backup Voltage All 2.0 5.5 V
T
A
Commercial Operating Temperature, Ambient CY2291/CY2291F 0 +70 °C
Industrial Operating Temperature, Ambient CY2291I/CY2291FI −40 +85 °C
C
LOAD
Max. Load Capacitance 5.0V Operation All 25 pF
C
LOAD
Max. Load Capacitance 3.3V Operation All 15 pF
f
REF
External Reference Crystal All 10.0 25.0 MHz
External Reference Clock
[6, 7, 8]
All 1 30 MHz
t
PU
Power-up time for all VDD's to reach minimum specified voltage (power
ramps must be monotonic)
0.05 50 ms
Electrical Characteristics, Commercial 5.0V
Parameter Description Conditions Min. Typ. Max. Unit
V
OH
HIGH-Level Output Voltage I
OH
= 4.0 mA 2.4 V
V
OL
LOW-Level Output Voltage I
OL
= 4.0 mA 0.4 V
V
OH–32
32.768-kHz HIGH-Level
Output Voltage
I
OH
= 0.5 mA V
BATT
0.5
V
V
OL–32
32.768-kHz LOW-Level
Output Voltage
I
OL
= 0.5 mA 0.4 V
V
IH
HIGH-Level Input Voltage
[9]
Except crystal pins 2.0 V
V
IL
LOW-Level Input Voltage
[9]
Except crystal pins 0.8 V
I
IH
Input HIGH Current V
IN
= V
DD
–0.5V <1 10 µA
I
IL
Input LOW Current V
IN
= +0.5V <1 10 µA
I
OZ
Output Leakage Current Three-state outputs 250 µA
I
DD
V
DD
Supply Current
[10]
Commercial
V
DD
= V
DD
Max., 5V operation 75 100 mA
I
DDS
V
DD
Power Supply Current
in Shutdown Mode
[10]
Shutdown active,
excluding V
BATT
CY2291/CY2291F 10 50 µA
I
BATT
V
BATT
Power Supply
Current
V
BATT
= 3.0V 5 15 µA
Notes:
5. Electrical parameters are guaranteed by design with these operating conditions, unless otherwise noted.
6. External input reference clock must have a duty cycle between 40% and 60%, measured at V
DD
/2.
7. Please refer to application note “Crystal Oscillator Topics” for information on AC-coupling the external input reference clock.
8. The oscillator circuit is optimized for a crystal reference and for external reference clocks up to 20 MHz. For external reference clocks above 20 MHz, it is
recommended that a 150Ω pull-up resistor to V
DD
be connected to the Xout pin.
9. Xtal inputs have CMOS thresholds.
10. Load = Max., V
IN
= 0V or V
DD
, Typical (–104) configuration, CPUCLK = 66 MHz. Other configurations will vary. Power can be approximated by the following
formula (multiply by 0.65 for 3V operation): I
DD
=10+0.06•(F
CPLL
+F
UPLL
+2•F
SPLL
)+0.27•(F
CLKA
+F
CLKB
+F
CLKC
+F
CLKD
+F
CPUCLK
+F
CLKF
+F
XBUF
).
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