CY2291F Cypress Semiconductor Corp, CY2291F Datasheet - Page 3

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CY2291F

Manufacturer Part Number
CY2291F
Description
IC 3PLL EPROM CLOCK GEN 20-SOIC
Manufacturer
Cypress Semiconductor Corp
Type
Clock Generator, Fanout Distributionr
Datasheets

Specifications of CY2291F

Pll
Yes
Input
Clock, Crystal
Output
Clock, Crystal
Number Of Circuits
1
Ratio - Input:output
1:8
Differential - Input:output
No/No
Frequency - Max
66.6MHz, 90MHz
Divider/multiplier
Yes/No
Voltage - Supply
3.3V, 5V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
20-SOIC (7.5mm Width)
Frequency-max
66.6MHz/90MHz
For Use With
CY3093 - SOCKET ADAPTER FTG FOR CY2291F428-1457 - KIT DEV FTG PROGRAMMING KIT
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
428-1392

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Pinouts
Pin Definitions
Notes
Document Number: 38-07189 Rev. *E
1. For best accuracy, use a parallel-resonant crystal, C
2. Float XTALOUT pin if XTALIN is driven by reference clock (as opposed to crystal).
3. Please refer to application note “Understanding the CY2291, CY2292 and CY2295” for more information.
4. The CY2291 has weak pull downs on all outputs (except 32K). Hence, when a three-state condition is forced on the outputs, the output pins are pulled LOW.
SHUTDOWN/OE
XTALOUT
S2/SUSPEND
XTALIN
CPUCLK
32XOUT
VBATT
Name
CLKC
XBUF
CLKD
32XIN
CLKB
CLKA
CLKF
GND
VDD
32K
S0
S1
[1]
[1, 2]
Pin Number
4, 16
10
11
12
13
14
15
17
18
19
20
1
2
3
5
6
7
8
9
32.768-kHz crystal feedback.
32.768-kHz output (always active if VBATT is present).
Configurable clock output C.
Voltage supply.
Ground.
Reference crystal input or external reference clock input.
Reference crystal feedback.
Buffered reference clock output.
Configurable clock output D.
CPU frequency clock output.
Configurable clock output B.
Configurable clock output A.
Configurable clock output F.
CPU clock select input, bit 0.
CPU clock select input, bit 1.
CPU clock select input, bit 2. Optionally enables suspend feature when LOW.
Places outputs in three-state
places outputs in three-state
Battery supply for 32.768-kHz circuit.
32.768 kHz crystal input.
LOAD
 17 pF or 18 pF.
XTALOUT
Figure 1. CY2291- 20-pin SOIC
CPUCLK
32XOUT
XTALIN
CLKC
XBUF
CLKD
GND
32K
V DD
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
SHUTDOWN/OE
32XIN
V BATT
S2/SUSPEND
V DD
S1
S0
CLKF
CLKA
CLKB
[4]
[4]
condition and shuts down chip when LOW. Optionally, only
condition and does not shut down chip when LOW.
Description
CY2291
Page 3 of 17
[3]
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